STACK-UP LECTURE 1

[@TheEssenceofknowledge]

www.udemy.com/course/tsa-essomec/?couponCode=BIPINTSAFREE use the link, for Free on Udemy, You will be able to connect with me in live sessions and I will unlock remaining videos here for more practice.

[@siddharthasarkar7281]

Most difficult things explained in easiest way, best tutorial for stack up in youtube. Highly recommended for mechanical engineers.

[@TheEssenceofknowledge]

Thanks Siddhartha!!

[@saurabhshrivastava12]

Thank you very much , you have given a great explanation on stack up analysis that is very important for a design engineer!!!

[@adityakulkarni4786]

This is absolutely informative and explanation was done in lucid and clear way. I would recommend this to other engineers as well. Thank you for making us aware these theories.

[@TheEssenceofknowledge]

Thank you!!

[@first.7457]

Better explanation sir.. But one point is not coveted that VC is constant value and RC is variable... Best explanation for VC.. really comprehensive...

[@TheEssenceofknowledge]

Yes correct RC is variable... I just put the extreme one for worst case tolerance stack up. Thanks.

[@darshandg9747]

Thank you for the informative video. I have one query. As per ASME definition RC is worst case scenario, but you are telling its best case scenario. Could you please explain the difference between virtual and resultant condition in Layman terms for better understanding and to avoid confusion between VC and RC.

[@kshitijx]

Thank you! A quick question from 12:42 to 12:50. Shouldn't the re4sultant condition be MMC-GTOL-BT instead of LMC-GTOL-BT. In tha case your shaft becomes 9-0.1-2 = 6.9mm. Shouldn't it be MMC-GTOL-BT which would be 11-0.1-2 = 8.9mm?

[@TheEssenceofknowledge]

If mmc modifier is in gtol frame, RC is always based on LMC. MMC will be in calculating VC. RC for a shaft is at smallest sizen of shaft and considering hole where it is assembled is at true position and at biggest size. This LMC - gtol - BT does not imposed on size tolerance zone. Do not confuse that shaft can be manufactured at RC, in manufactured dimension limits of size always respected. Let me know if this answers your question

[@abhijeet2816]

As you have mentioned, In case of R C for Bonus tolerance if shaft is manufactured at its LMC , RC will be = LMC - 0.1 (G Tol) - 2 (Bonus Tol.),= 7.. In this case we are reducing Shaft Dia much.. I am not able to understand significance of Bonus Tol. And where it shall eb used. Could you please guide in detail..

[@TheEssenceofknowledge]

We are not reducing the size, these are virtual things. If shaft get manufactured at LMC that is it has allowances of location of. 1 and as it is smallest size, further location allowance is 2 that is bonus. Size of cross-section can not be less then stated size and size tolerance. Plz let me jnow if this clarifies.

[@abhijeet2816]

@@TheEssenceofknowledge Thank you got it

[@abhijeet2816]

@@TheEssenceofknowledge , one more query sir, this do we need to consider Bonus tolerance during Stackup Analysis..

[@TheEssenceofknowledge]

@@abhijeet2816 yes if mmc modifier is given we need to consider, it will help us to give find the max gap.

[@lokchandsantoshkumar7555]

Hi, While explaining the Vc for shaft,you can tell that minimum dia of hole is req to accommodate the shaft...instead of using maximum dia of hole...

[@TheEssenceofknowledge]

lok chand santosh kumar , yes correct. At time of explanation I was thinking for shaft that's why I explained this way. Next lecture includes this. Let me know if other improvement points as well.

[@lokchandsantoshkumar7555]

Sure.

[@keshavachandu99]

Explanation was very good i enjoyed your lesson sir now i am very much clear about it thank you sir....

[@siddharthasarkar7281]

Hello, I have a confusion with bonus tolerance. If the shaft is at LMC means 9mm but modifier is .1mm then it can total increase upto 11.1mm, means bonus tolerance is 2mm + gtol .1mm = 2.1 total tolerance. But why shall it be minus from LMC as you mentioned in RC of shaft = LMC- GTOL-BONUS, it should go 9-.1-2 = 6.9mm, I think while getting bonus in shaft everything should be on plus (shaft can be curved that the allowance). How can the shaft dia be less than 8.9mm? Let me know if I am wrong.

[@TheEssenceofknowledge]

Bonus is for form or location not for size. Suppose a shaft of 10+-2 and gtol.1 at mmc. It means when shat at mmc 11 it there wll be.1 location tolerance on it. But suppose shaft is at 9 so it can have more allowance to move as it is small that will be 2.1.. So bonus is always amount of departure of shaft from mmc. If manufactured dimension is 9.5, we get bonus of 1.5 only. Plz watch gd&t lectures those clarifies more. Let me know if you need further explanation. Thanks

[@aquilhasanjafri269]

I have the same question.. please clarify it here. It will be very helpful

[@priyavarmachodasani7744]

Chala bhaga chapparu sir, very good & simply explanation

[@muralidharan5784]

Very well explained.tq sir for sharing your knowledge.👍

[@rangad7325]

after Bonus RC = LMC-G TOL-BOUNUS it means LMC OF SHAFT is 9mm and G tol is 0.1 and bonus = 2 So RC= 9-0.1-2 == 6.9 mm dia also acceptable in production?

[@TheEssenceofknowledge]

No, cross section must be with in size limit.. these are virtual limits..

[@all41n14lla]

It is important to point out that in the case of Screws and Washers Virtual Conditions are not considered .. Only when you have studs or pin on a plate are positional / virtual tolerances considered .. Likewise with the washer .. In a plate with many holes then the virtual conditions are assumed to be required ..

[@TheEssenceofknowledge]

Sure Thanks, will try to include your points in coming..

[@chinku1803]

Very nice explanation. Thanks for such a simple and complete explanation on this subject. Keep posting.

[@nayan2596]

Nice explanation for a person having basic GD&T knowledge, which is must for stackup analysis. But you need to provide diameter symbol before Gtol. Becoz tol zone is cylindrical and can't be one directional.

[@TheEssenceofknowledge]

Two plane rotated around a axis makes required envelope. It good to put symbol but it doesnot makes onedirectional. And tolerance always circular not rectangular.

[@nayan2596]

When you are not putting dia symbol it represents a rectangular tol zone. You might be aware. Technically not putting the symbol is not a mistake, but it's less accurate. I didn't understand what you meant by there is no rectangular tol. Profile, form has gdnt callouts which are non circular also. It depends on specifying the diameter symbol.

[@TheEssenceofknowledge]

@@nayan2596 yes I know what u are saying it should be mentioned. I specifically told regarding positional tolerance. Otherwise for flatness it will be two parallel plane only. Tolerance zone is always depends on type of gtol and even how we are presenting it. But It can not be one direction that is what I said as even primary datum locks 3degree of freedom. And if it is axis it locks 4degs that is what i meant.

[@akhileshdhere7522]

thanks for making this tutorial. and it is very helpful for me.

[@D26R98P98254]

I've been looking for some guidance. Your videos are very helpful. Thank you very much for sharing them.

[@TheEssenceofknowledge]

Thanks Devam, I am happy if that helped.

[@lfmoura15]

Obrigado aqui do Brasil!!! Grande abraço !!!

[@TheEssenceofknowledge]

obrigada tudo de bom

[@Darthvader81498]

I think the modifier is wrong, it says the true position will only be activated at M which is Maximum Material condition. But you activated it for LMC should have been L for the condition you described. Or Logically It will be activated at M and then RC= MMC+GTOL+Bonus. Which means when the shaft is biggest it should be centred as it will be hard to insert.

[@TheEssenceofknowledge]

I don't understand what you explained. Shaft RC = LMC - gtl - bonus. Hole RC =LMC +Gtol+bonus.

[@Darthvader81498]

@@TheEssenceofknowledge For the shaft you have to look at the worst possible condition. That would be shaft at its biggest, when mating with the hole it will have issues as a small shaft will fit ... a big shaft won't fit. Which means Worst case scenario = MMC of Shaft + True center of the shaft is displaced. If the true center is displaced, that will result in an effective diameter of 0.1+0.1 when the shaft is moving (you can look at it from a Gaussian curve or from 2 point method... ) So True center will only be activated when M (M here stands for MMC according to the notations) is met .. which is the maximum material condition of the shaft. So now the worst case for a moving shaft in a hole is : Worst case scenario = MMC of Shaft + True Center offset (0.1)+ Bonus when moving ( 0.1)

[@TheEssenceofknowledge]

@@Darthvader81498 yes correct worst case is VC. That do not carries bonus. Bonus is the case when MMC modifier is in Gtol frame. So virtual condition is VC=MMC +Gtol for shaft. VC= MMC-gtol for hole. No bonus is in VC. RC is best case. Bonus we get when manufactured dimension departs from MMC towards LMC. And bonus is equal to amount of departure. RC is best case when shaft or hole is at LMC. RC= LMC-GTOL-BONUS FOR SHAFT. =LMC+GTOL+BONUS FOR HOLE. This is as per ASME 2009 Y14.5. let me know if this clarifies you.. thanks

[@Darthvader81498]

@@TheEssenceofknowledge best case scenario kind of defeats the purpose of stackup analysis. Also when the GD&T box has M it is only applicable during MMC. M modifier means MMC

[@TheEssenceofknowledge]

@@Darthvader81498 not only applicable to MMC, it is thru out. That gives Bonus. It means, if shaft manufactured at MMC we get only Gtol mentioned. But if manufactured dim departs from MMC we get bonus of amount of departure as a form or position error that is allowable. at LMC we get max bonus. Now if someone uses LMC modifier L in frame concept reverses and we get bonus when dim departs LMC. The formula and the concept is from ADME2009 Y14.5.

[@rosaiahpolisetti9924]

if the parts get manufactured shat at lmc the bonus tolerance is 2.1 corect ?

[@TheEssenceofknowledge]

bonus would be MMC-LMC only. The RC = LMC - Gtol -Bonus for shaft, = LMC + gtol + Bomnus for hole

[@yogeshkawale5154]

Vry nyc.. Explanation is perfect for fresher....!!! Thank u sir

[@lokchandsantoshkumar7555]

Hi, Vc for shaft is min hole dia req to accommodate the worst case senerio of the shaft not the max hole dia...

[@TheEssenceofknowledge]

Hi, yes correct. I think this thing we discussed before 2 month as well. Next lecture includes that. And while explaining I was thinking of shaft so gone this way.

[@TheEssenceofknowledge]

And please keep exploring and let me know. Thank you!!

[@VaibhavShetiye]

Sir, where is stack up lecture 2 and 4, I know you have uploaded those two video but right know they are not showing in channel

[@amitmahabare4730]

What is total allowable tolerance of shaft become LMC Size? Shaft size- 20+/- 0.1, GTOL frame is perpendicularity dia. 0.1 m Modifier is there. Please answer as per your convenience. Thanks

[@TheEssenceofknowledge]

Hi Amit, sorry for this late response. on shaft being LMC i.e. 19.9 it will have bonus of .2 as M modifier is there. so total allowable tolerance will be .2+.1 = .3, let me know if this clarifies your question. thanks

[@amitmahabare4730]

@@TheEssenceofknowledge yes thanks

[@shreyaskhade3019]

Sir, please make video on how to calculate or how to decide limit value (upper and lower limit) for any dimensions of any part.

[@TheEssenceofknowledge]

It's always functional requirements of assembly. In some cases positional tolerance can be calculated..

[@reubenf3112]

does modifier "M" add bonus RC only for Least Material condition? Is there a modifier available for MMC ?

[@TheEssenceofknowledge]

Modifier m means that the MMC is important and gtol is applicable if part manufactured at MMC. If manufactured size departs from MMC we get bonus of amount of departure and Max bonus is available if component manufactured at LMC. Modifier M is for MMC showing it is important. Modifier L shows LMC is important and we get bonus when size departs to MMC from LMC. Let me know if this clarifies. Thank you!!

[@panaj1000]

Good work bhai!!👍

[@TheEssenceofknowledge]

Thank you!!

[@diyadas1132]

It was an informative lecture

[@abhinandanchougule7306]

Nice video...clear understanding...

[@rangad7325]

Sir, Please explain me how this affects a production and do some numerical calculation

[@TheEssenceofknowledge]

This affect design, if we do not do Tolerance analysis. We might get component got manufactured but causing problem during assembly..

[@strighttothepoint1957]

Why we should use MMc and LMC terms in manufacturing drawing,instead of it we can use tolerance itself know.what is the need of it .pls clarify it.

[@TheEssenceofknowledge]

These modifiers in gtol tolerance allows more form or orientation tolerance when size produces is not on critical value.

[@sureshpadasalagi7112]

Sir even if u consider RC, Should the Gtol be positive? like RC=LMC+Gtol, bocoz u know if whatever way it shifts then that much dia of hole is needed to fit right?

[@TheEssenceofknowledge]

It is inside boundary so should be substracted.

[@sureshpadasalagi7112]

@@TheEssenceofknowledge TQ sir. Sir can we expect full course on GD and T form u. It would be lot helpful for us🙏.

[@TheEssenceofknowledge]

@@sureshpadasalagi7112 I do that. Next Batch is coming on 20, that is a weekend batch. Saturday and Sunday

[@sureshpadasalagi7112]

@@TheEssenceofknowledge Do I need to register for it or it will be on KZbin for free? Sry for lot of questions I'm new to the channel

[@TheEssenceofknowledge]

@@sureshpadasalagi7112 it's paid and need to register.. thank you Suresh

[@paragpemgirikar2695]

In the above example, the Bonus tolerance is 1, or is it always the difference between MMC and LMC irrespective of the hole or the shaft?

[@TheEssenceofknowledge]

for calculations yes. Actually the Bonus is amount of departure. Suppose Shaft manufactured at MMC will get 0 bonus, If shaft shaft manufactured departs from MMC towards LMC, we get actual bonus as amount of departure. Let em know if this clear.

[@popatpandhare2039]

Dear sir ,we have required clearity shifting of shaft which side

[@TheEssenceofknowledge]

I think it can shift in any direction with in gtol value. Please let me know if you are asking questions un different context. Thanks

[@MegaBruse]

Good one, but I think gtol should be taken half of the tolerance given

[@TheEssenceofknowledge]

No, it's Gtol. Because that is available at RFS. Refer ASME 2009 Y14.5

[@143kovilakath]

Hole dimension is dia 10 + or - 0.5 ,I need a transition fit . So wot will be the size of the shaft and tolerance

[@TheEssenceofknowledge]

Transition fit toleraces are generally too precise. Here tolerance zone is. 5. Study bearing for transition tolerances. Skf provides good detail. Like 10 mm, keeping 10 as base bore tolerance should be - 8 micron to 0 micron. Shaft can be h6, h8, j5 or j6 depending on condition and requirements. Let me know if this helps and your further queries

[@143kovilakath]

@@TheEssenceofknowledge Thank you sir

[@sachinbr7262]

Sir what is the use of VC ?

[@iamsunilparida]

I LOVE YOUR TEACHING STYLE BRO

[@harisankar8939]

Hi, in bonus tolerance of resultant condition for the given example is 2.1mm or still .1mm. Please clarify.

[@TheEssenceofknowledge]

Bonus tolerance is the amount of departure from MMC. Suppose a shaft 10 +-1. And gtol of.1 and modifier is mmc given in frame. If shaft at its MMC that is 11 we will get no bonus. Now suppose shaft manufactured at 10, amount of departure is 1 so bonus will be 1.0 and gtol is..1 so total tolerance 1.1 now suppose it is at 9 i. E. Its LMC for resultant condition we get max bonus of 2, this is amount of departure and gtol is. 1 so total tolerance wll be 2.1 at resultant condition. Let me know further query. Thanks

[@sivaprasad4485]

Sir presentation last line u said bonus tolerance which is MMC-LMC then should add tolerance also I think please correct me if I am wrong

[@TheEssenceofknowledge]

Bonus is like additional tol for positional error we get. If part is manufactured at MMC we get the Gtol mentioned as positional error. But when it departs towards LMC we get bonus of amount of departure. When it is manufactured at LMC we get max departure that is MMC-LMC. So that is best case bonus. Let me know if this clarifies your query.

[@karthikramasamy268]

Sir, Once we are calculating VC & RC of shaft, how decide the counter matting part hole Nominal dia, hole feature tolerance and position shift.?????. Thanks in advance.

[@TheEssenceofknowledge]

KARTHIK Ramasamy , the virtual condition of shaft should be virtual condition for hole. Once you calculated vc of shaft you will know what minimum hole dia you need. Then depending on fit needed decide dim. Suppose it's a dowel pin hole, you should select transition fit.

[@TheEssenceofknowledge]

Let me know further query

[@fenilpillai]

Nice One Sir.👍🏼

[@ОлександрСавченко-т6й]

гарний козак. і сорочка гарна. я йому вірю. !!

[@balajigovindarajan2422]

you are the awesome explanation is pretty clear. please do share more topics about GD& T and Stack up analysis.

[@TheEssenceofknowledge]

sure, I will do so. Thank you!!

[@venkatshivareddy7801]

Sir. Please explain me about Bonus Tolerance and its modifier.

[@TheEssenceofknowledge]

Okay, I do online classes, whenever the session will happen I will let you know.

[@venkatshivareddy7801]

@@TheEssenceofknowledge ok sir.

[@RailFan92]

Hi Sir, I have a doubt what is the use of Resultant condition in Stack up Analsis

[@TheEssenceofknowledge]

sorry for late reply, I was travelling. by calculating VC and RC we get a single size and tolerance replacing size its tolerance and GTOL. that we can use in stack-up. please let me know if this clarifies.

[@rangad7325]

@@TheEssenceofknowledge No Sir, Please explain me how this affects a production and do some numerical calculation

[@makarandbhosale3619]

Hello sir, my doubt is what if I use L modifier. The vc is a worst case or best case. Plz explain vc & rc for lmc concept

[@TheEssenceofknowledge]

See lecture 10 of gd&t. It explains it.

[@wednseca]

why is worst case of a shaft always mmc ! why not lmc? similarly for hole

[@TheEssenceofknowledge]

May be not always but usually. Think as per assembly. Shaft or any part is big in size will cause problem. Will have less chance to be with available space. MMC is that case. While same with hole small hole or slot will cause problem in assembly, i.e. Again its MMC. In very few cases LMC causes worst case. For that you can check last video in gd&t series.

[@mangeshdeshmukh2140]

Nicely explained , Thank you

[@TheEssenceofknowledge]

Thank you and welcome.

[@boopathiktm7775]

Tq sir.. It is wonderful explanation..but, I have a doubt in this lecture that what will happen on both shaft and hole if we given lmc modifier.. Pls kindly explain this doubt sir.. Tq..

[@TheEssenceofknowledge]

With LMC modifier the LMC condition will be important and we get Only mentioned Gtol.. as component departs towards MMC condition we get bonus. I have explained in one of the video. Thank you!

[@rahulgaikwad902]

@@TheEssenceofknowledge share the link of that video in comment

[@vijayprakash8666]

Sir pls clarify my boubt sir, we calculating virtual condition of shaft..reason for..minimum size of hole to accommodate the shaft, it is reason for calculating virtual condition. But resultant condition, we are calculating for shaft ..why are calculating..what are types of reason. Can you please elaborate explain this

[@TheEssenceofknowledge]

Many time loose fit also may result in many issue. So we calculate RC. That is why RC and VC used in tolerance stack up analysis to get max clearance and min clearance or interference. Let me know if this clarifies. Thanks.

[@vijayprakash8666]

Thank you very much sir for clarifying my doubt sir.as your brother I am asking sir.why your don't put more vedio...

[@TheEssenceofknowledge]

@@vijayprakash8666 thanks Vijay. Last 8-9 months never been easy for me. Was dealing with few bad things. Now bad phase over. Planning to new start. Soon will be back. Thanks Vijay.

[@vijayprakash8666]

@@TheEssenceofknowledge .thank you for your reply sir.waiting for u vedio sir.not only me, many people eagerly waiting for u r vedio, pls as soon as possible putting vedio..your explaining spr sir, easy to understand sir.. Sir can you pls share material , my mail id [e-mail]

[@velkumarbe]

Thank you sir..... What are you teach I understand.... But my doubt...I will make one shaft(DIA 5) with assembly, shaft will come MMC=6 , and also hole will come MMC=4, How to assemble that part.

[@TheEssenceofknowledge]

if you make shaft of 5±1 its VC = MMC = 6. Always hole vc should be equal or greater than shaft vc i.e. hole VC = 6 = mmc of hole. Now we know hole MMC = 6, Hole LMC = MMC + tolerance, suppose tolerance is 1 so lmc hole = 6+1 =7 so hole dimension must be 6±.5. this is how it goes. let me know for further clarification. Thanks.

[@narenmids]

@@TheEssenceofknowledge So here in a condition of shaft and hole in MMC, how can we assemble? As you said, Shaft MMC = 6; Hole MMC is 5.5

[@TheEssenceofknowledge]

@@narenmids sorry for late reply. I have said hole MMC 6. So it cant be 5.5 it will be more then 6 always. Let me know if I am not getting you correctly. Thanks

[@jeyanthganesan9538]

Explained well. Thanku

[@vijayg1776]

Sir, in this video you were said if Gtol got (M)modifier there the shaft will manufacture smaller.here my question is if Gtol got modifier (L) what will happen. More over here as per the RC formula the shaft dia get 6.8 (LMC-Gtol-bonus.9-0.2-2=6.8). But the shaft LMC is 9. Here the shaft dia-6.8 ( as per the RC formula) this 6.8 dia is so exceed the LMS dia 8.is it possible?

[@TheEssenceofknowledge]

Would you please check lecture 10 in gd&t. It will help for that. Let me know further queries. Thanks.

[@vijayg1776]

@@TheEssenceofknowledge can I get the answer for my 2question also in lecture10 video.

[@TheEssenceofknowledge]

@@vijayg1776 the answer for that is cross sectional size must be with in size tolerance limit. Suppose a shaft 10+-1. All cross ection must be between 11 and 9. But suppose it is distorted all the way in lenght by 1mm it will have envelope of 12. Mini size of hole will be 12 because of form error. VR and RC are virtual effect of form errora. Size tolerance must be respected everywhere.

[@TheEssenceofknowledge]

6.8 is resultant condition boundary not diameter. It like common boundary of shaft manufactured at LMC and displaced by given gtol and bonus in all directions.

[@aswinkumar802]

what is the impact of modifier M in bonus tolerance sir?

[@TheEssenceofknowledge]

More usable parts those might be rejected due to stringent Torrance will be getting accepted after using this.

[@kr5756]

Hiii sir,I saw ur lacture vedio it is very helpfull for me,so thanks for u, I want to know about how to relate flat tolerances to the position tolerances on same face.

[@TheEssenceofknowledge]

Karan, not sure in which ref you are asking but position will control it location with respect to a datum where as flatness contols form means surface lies between two parallel plane irrespective of any datum. Let me know ur further query. Sorry for late response

[@HaIPeHaOP]

You say 2mm for a bonus tolerance it is a difference in diameters but you highlight a difference between radiuses which is 1mm, is that correct?

[@TheEssenceofknowledge]

Bonus is actually variable should be referenced to manufactured dimension. Bonus is MMC-manufactured dia. In case it manufactured at LMC.. we get 11-9 that is 2 mm. Let me know if this clarifies.

[@tushartiwari3867]

I think one terminology is incorrectly mentioned in thia lecture that is bonus Tolerance. Actually bonus tolerance is not the difference between LMC and MMC. Its the differences between the MMC/LMC and the Actual dia of hole/shaft is manufactured.

[@TheEssenceofknowledge]

This is just for calculation for max bonus, this to use in Tolerance stack up. So you are right but here We are doing worst case TSA

[@Sloomfarah]

THANK YOU!!! God Bless you!

[@Suryoday]

best video for mmc annd lmc\\

[@naveenkumar-fs8lv]

Nice explanation & easy to understand, if possible can you please give the same example with position control (GD&T)

[@TheEssenceofknowledge]

naveen kumar , yes sure..

[@ajunsusekh5298]

I have learned that Bonus tolerance is the sum of (difference between MMCwith the actual condition ) and the GTol ?? Is that wrong ?

[@TheEssenceofknowledge]

ajun susekh, Bonus is difference between Mmc and actual manufactured..I.e. departure amount. Gtol is always there.

[@premanandjawale6639]

thank you so much.. i was stuck here

[@sureshcadcam2913]

is there any online course on tolerance stachup

[@TheEssenceofknowledge]

There are many, I am also coming with that soon.

[@harijpm23]

Sir, How it is find out in drawing(Virtual,Resultant condition)?

[@TheEssenceofknowledge]

You can calculate with these formula, reference from ASME 2009 Y14.5. If no Gtol, worst case will be VC and best case will be RC.

[@exaryuko]

ohhhh well explained !! Thank you so much

[@TheEssenceofknowledge]

thanks

[@namachivayamswaminathan5378]

Excellent explanation Resultant condition not understand

[@TheEssenceofknowledge]

For a hole if MMC modifier is used, the Resultant condition is when hole is produced at biggest size that is LMC and it is dislocated by Gtol and bonus. It will be LMC + Gtol + Bonus

[@MrJohn007david]

How to calculate the tolerance stackup of hinge button to press micro switch? Or give example for rotating parts say 5-10 Deg.

[@TheEssenceofknowledge]

I have not much Idea regarding hinge buttons.. I will check and get back to you. If you have any rough sketch of parts I can guide better. If we are doing stack up for polar dimensions, all dimensions should be in that or we will need to convert them in linear form.

[@TheEssenceofknowledge]

@Kate Jayesh please share any image or any thing for reference on which I can do analysis. Mail Id [e-mail]

[@gowthammurali1224]

Thank u so much for ur valuable lecture...

[@unstoppable1808]

What will happen when MMC given to the datum also ?

[@TheEssenceofknowledge]

That is not MMC. That is MMB. In that case datum simulator will be maximum material boundary.

[@unstoppable1808]

@@TheEssenceofknowledge I have read one control frame in which datum given with MMB and also with plus and minus some tolerance ?

[@unstoppable1808]

What will be it's meaning

[@TheEssenceofknowledge]

@@unstoppable1808 that means the value of datum shift allowance. Check my video on Datum shift.

[@SantoshKumar-wf7nv]

What are the types of tolerances in gd&t in general sir.

[@TheEssenceofknowledge]

GTOLs mainly grouped as form, profile, Orientation, Location and run-out tolerances. Watch GD&T lect 2 for brief of gtols.

[@sasirajulapati]

I have this question from my work. A dimension of a part has a position tolerance of 0.35 mm. Inspection report from supplier says 0.470 which was accepted and in comments he said "according to MMC up to 0.555". My question is bonus tolerance is applied only to hole right? or also for position? How can position tolerance be 0.555?

[@TheEssenceofknowledge]

sasi r, actually bonus tolerance applied only when modifier MMC is in gtol frame. Suppose your dimension is 10+-1 and gtol is given of .35 with MMC. It means when dimension manufactured is 11 that is MMC you will get only position tolerance of .35. but now component manufactured at 10 that is departure from MMC is 1 mm, in this case you will get 1.35 mm of position tolerance. And now suppose it get manufactured at 9 that is it's LMC, Its departure from MMC is 2 mm you get position allowance 2.35 mm. This additional we are getting is bonus. I explained you for shaft or block. Same will happen with hole or slot. Bonus is applicable to all dimensions if gtol has modifier. Let me know if you have further questions. Thank you. Watch GD&T session it will get more clear..

[@viru14g]

I have just started with the whole understanding of this GD&T and thus have a question regarding it. What are the different types of GD&T courses do we need to study in order to study this whole subject? I guess Stack up terminologies are one of them. Can you name the rest? Thanks!

[@TheEssenceofknowledge]

Refer ASME 2009. Y14.5. It shows Dimensioning and geometric tolerances for drawing. Stack-up is study of tolerances. Similar things are like DFMEA, SIX SIGMA etc. This will be enough for defining a geometry on drawing. You can learn CAD, FEA software to enhance further more on design side. Always keep basics of design with these skills. Let me know if more queries. Thank you.

[@viru14g]

Oh yes, this makes sense. Thanks!

[@gowthammurali1224]

this is so perfect thank you so much sir.. and hats off for sharing your's wonderful knowledge ...

[@TheEssenceofknowledge]

Thank you.

[@amardipsinhrahevar707]

Difference between MMC and virtual condition. Please answered me. And what is GTOL

[@TheEssenceofknowledge]

Amardipsinh Rahevar , MMC is Maximum material condition, Gtol is geometric tolerance. MMC for shaft or hole is when feature will have maximum material where as virtual condition for a shaft is minimum size of hole required to accommodate it in its worst case. What is worst case for shaft, when it is at MMC+ position or form error of Gtol. Same way for hole virtual condition, max Dia of shaft it can accommodate in its worst case. What is worst case of hole, it is it's MMC - form, position error(Gtol).

[@TheEssenceofknowledge]

Amardipsinh Rahevar , please let me know if further queries.

[@sunnybhalerao6381]

Pls share your comments on rc and VA.

[@playhard9354]

Sir why we need to calculate virtual and resultant condition?

[@TheEssenceofknowledge]

We calculate VC and RC for considering effect of geometric tolerances during stack up analysis. Let me know your further query.

[@deepakgarg2953]

How

[@TheEssenceofknowledge]

@@deepakgarg2953 please see lecture 6in this series. You will get answer. Let me know further queries.

[@Santhoshtm]

Position tolerance will usually be symmetrical tolerance but you are explaining it as tolerance applied in single side of the shaft ... Correct me if am wrong

[@TheEssenceofknowledge]

Positional envelope will be a cylindrical one, so it is always symmetrical. But In real case shift is posible one side only at one time. That is why I am explaining so. Formulas are correct, you can see images in video or refer ASME 2009. Let me know if need more details.

[@arvindchatrji4670]

Sir please clear one thing what is size shaft and hole at lmc in rc

[@TheEssenceofknowledge]

Sorry for late reply was travelling. Size of shaft or hole remains as per size tolerances. the geometric tolerance with or without modifiers gives gives virtual condition and resultant condition, these are not real dimension but effective size available during assembly. let me know if this clarifies. thanks.

[@arvindchatrji4670]

How to deduct bonus tol. From shaft what is size after deduction please clear

[@TheEssenceofknowledge]

Bonus tolerance is only available during best condition that is at resultant condition when shaft become smaller or hole become bigger. Suppose shaft size 10 +-1 so when it get manufactured at 9, we get bonus of 2 and deducted while calculating resultant condition.

[@venkatshivareddy7801]

Hello sir, Can explain Bonus Tolerance in detail

[@TheEssenceofknowledge]

When we use MMC or LMC modifier in feature control frame with tolerance we get bonus. Suppose we use MMC modifier and real part manufactured at MMC we get only tolerance species in frame. Now suppose part manufactured is not at MMC we get bonus by the amount of departure. You can attend free webinar on 21 may if we use Modifiers with datums then what it means visit essomec.com let me know if this clarifies

[@venkatshivareddy7801]

@@TheEssenceofknowledge How we will come to know, which one we have to use, either MMC or LMC,, also In feature control frame we will get GTOL. But your telling GTOL + Bonous tolerance

[@TheEssenceofknowledge]

@@venkatshivareddy7801 we use MMC or LMC modifier depend on functionality. Suppose a extruded boss has a hole at center and it creates very less thickness of that. Now if hole is bigger that is at LMC creates problem for thickness. At this time we use LMC modifier as LMC condition is important to us. Now suppose another case when a hole on cylindrical part and a shaft passes thru that. If hole becomes smaller that is MMC condition creates problem during assembly, so MMC condition is important to us. We will use MMC modifier in this case. Now if we use Modifiers.. produced hole is departed from mmc or LMC condition we get bonus. Let me know your further queries. Thanks

[@antonyedison1222]

Good explanation

[@tusharkdalbehera313]

Is there any certification programs available related to GD&T?

[@TheEssenceofknowledge]

You can get certified from ASME

[@RealBharatKatkade]

Hello sir , Thank you very much. Do you have any channel in telegram?? Please post the link.

[@TheEssenceofknowledge]

I have not much knowledge of telegram. Please suggest so i can do same at there.

[@RealBharatKatkade]

On telegram you can keep us updated about new video and ask us to vote for on which topic video should be done!

[@occasional322]

Very nice....

[@keshavachandu99]

Thank you sir but you didn't explain stack up analysis,I hope you will share in future

[@TheEssenceofknowledge]

keshava chandu , did you watched 2nd and 3rd lecture, please go through that. I have explained loop diagram. Statistical stack-up is pending I will do that soon.

[@TheEssenceofknowledge]

keshava chandu, I am not getting exactly what you want. Do you gone through lecture 2-3 of stack up analysis. It's guides for loop diagram and all. Let me know if anything specific. [e-mail]

[@keshavachandu99]

Thank you for that sir you have explained MMC,LMC,BONUS TOLERANCE,VIRTUAL CONDITION Etc....I understood completely,would you give conclusion of stack up analysis.

[@keshavachandu99]

I haven't gone through 2nd and 3rd lecture today I will do thank you sir

[@TheEssenceofknowledge]

Please go through that, it explains loop diagram with few example. Let me know if you have any query further.

[@abdullahshaikhengineer]

sir can you more elaborate on modifier??

[@TheEssenceofknowledge]

abdullah, sure I will include a session for modifiers..

[@Varun-uv4li]

best lecture !!

[@santhageethan5134]

If bonus tolerance applied. R.C for hole is 13.1.how it is

[@TheEssenceofknowledge]

I m not sure at which point you aking but RC for hole is lmc + gtol + bonus. And bonus is maximum amount of departure that is LMC of hole - MMC of hole. Please let me know further query

[@dillipnayak5668]

best lectures thanku

[@vijayg1776]

Sir, I couldn't understand if Gtol got modifier. Please kindly explain sir

[@TheEssenceofknowledge]

If Gtol with modifier, it means it allows addional tolerance. Suppose a shaft 10+-1 is given. And gtol of. 1 on dia shows that mmc modifier. It meams mmc of shaft importance to us. I. E. If dia 11 manufactured then it will be. 1 gtol. But suppose it departs and manufactured at 10.5 we get additional of. 5 positional tolerance because that is not critical as per assembly. Let me know if u got this.

[@vijayg1776]

@@TheEssenceofknowledge Sir, is the gtol modifier used for in Resultant condition only?

[@TheEssenceofknowledge]

@@vijayg1776 yes, it do not affect vc. As we know vc is always critical case. And modifiers says that the critical condition is important and carries no bonus. But as it moves from critical condition we get bonus. So not only RC any value in which size manufactured different from critical size we get bonus. In RC we get max bonus.

[@vinaykb2337]

good one bro.....

[@sarojranjanjena8169]

what is the difference between iso & asme std?

[@TheEssenceofknowledge]

Not much. Little bit. Meaning do not changes.. few representation

[@sarojranjanjena8169]

@@TheEssenceofknowledge but how to i identify without chek the temple of drawing like this drawing created as asme standard?

[@sarojranjanjena8169]

@@TheEssenceofknowledge thanks

[@TheEssenceofknowledge]

@@sarojranjanjena8169 many things, like drawing decimal places. Metric must be in 0.1 dimensioning where as imperial .1 title block must say that.

[@junaidshaikh4514]

great explanation sir... would u pls refer a book for stack up analysis?

[@TheEssenceofknowledge]

Junaid Shaikh , best thing is to download ASME Y14.5 2009. It is good guide.

[@junaidshaikh4514]

The Essence thank you for the quick reply..I searched for ASME Y14.5-2009 and finding lot of PDFs..would u please share the link to download ASME y14.5 2009?

[@TheEssenceofknowledge]

Hi Junaid, share your mail ID

[@junaidshaikh4514]

Hi, my email id: [e-mail]...

[@TheEssenceofknowledge]

Shared you details. Please check.

[@sunnybhalerao6381]

I have doubts for vc and rc.

[@TheEssenceofknowledge]

Hi Snehal, please tell me your queries. You can mail me those on [e-mail]

[@harshalsonawane8879]

What is GTOL

[@TheEssenceofknowledge]

Geometric Tolerance

[@RamKumar-ps7hp]

How to calculate tolerance for runout

[@TheEssenceofknowledge]

Ram Kumar , I will cover details about runout in GD&T lectures, but the value of tolerance is always a functional requirement. Suppose we need a very fine gap, than based on stackup analysis tolerance value will be decided. Let me know if you have any specific case, I can guide you for the values.

[@azaruddinshaikh4220]

Thank you for the info..