#GD

[@infinitymfg5397]

For other videos on engineering and manufacturing subjects: Strength of Materials: kzbin.info/aero/PLAXJqmuqGEr7QjsVVyl5jFY6HQTqw6Bfq Metal Casting: kzbin.info/aero/PLAXJqmuqGEr4wiY6xroSK67CXeTu0Otmk Quality: kzbin.info/aero/PLAXJqmuqGEr4LQvNzKHGO9l00gEN4gmSP Design: kzbin.info/aero/PLAXJqmuqGEr706zgRtnwgQiFC5FYLvaTr Automation: kzbin.info/aero/PLAXJqmuqGEr6O_nQ-n08qmrtNnAUruj3b Calculus: kzbin.info/aero/PLAXJqmuqGEr7Ayo18H7tknyQAJu1OcoUW

[@TeW33zy]

Explanation is good. But its 2018 you should always show a live inspection vs alot of taking. Do a live video checking tru pos of that hole instead of talking. Talk less show more.

[@will1603]

@@TeW33zy Comment is good. But its 2022 you should always talk with an appropriate attitude vs being condescending. Be more polite instead of commanding. Rude less kind more.

[@dilbertdude1]

One of the best, easy to understand descriptions I have ever seen! Thank you!

[@infinitymfg5397]

Thanks for watching!

[@haroldsimpson8422]

Doc, no matter how many tines I watch this same video, I continue to get value from it. Thank you sir, had you would have been my instructor back when I was undergraduate and graduate school I probably would have gotten my PHd.

[@infinitymfg5397]

Thanks. Comments like this are very motivational.

[@thompsonolorede959]

This presentation on basic GD and T is great. The explanations are so clear, thank you so much

[@marbrydav9698]

Your videos are excellent. I'm a Canadian Mechatronic Systems Engineering student reviewing GD&T, and you did a much better job in 22 minutes than my profs did in hours. Please continue to make more GD&T videos!

[@infinitymfg5397]

Thanks! I appreciate the feedback!

[@vythinathanduraiswamy3430]

Great introduction to GD&T. Please keep them coming. Thank you.

[@SunnyKhan-zw1wh]

Very good explanation. If I can understand then anyone can understand which means the content is great. Thank you

[@Pawel_Szczudlo]

Very clear. Very precise. Without any unecessary additions. I will follow this channel closely

[@infinitymfg5397]

Thank you! Welcome to the channel.

[@AnthonyClay]

3-2-1 had me scratching my head! I've been so used to CAD doing my constraints, I always assumed that I would never need to specify part orientation. I spent a few minutes confused by the datums but it finally sunk in: A references the back plane, which 3 points don't particularly matter. B References a (single) line along the top of the part, and C is any point along the right side. This opens up a better way to not just describe and manufacture my parts, but also the documentation/use of assembly jigs and part handling, thank you!

[@infinitymfg5397]

That's awesome!! Thanks for watching and the comment. I like that this video made something clear for you.

[@osmanduman6085]

@AnthonyClay A datum plane, B datum line C datum point. Fakat, A, B, C için üçü de plane (düzlem) olabilir. Bu daha doğrudur. Ben CMM operatörüyüm. Bu parça ölçülürken 3 planes daha doğru olur. Ortalama daha doğru sonuç verir.

[@osmanduman6085]

@AnthonyClay A datum plane, B datum line C datum point. Fakat, A, B, C için üçü de plane (düzlem) olabilir. Bu daha doğrudur. Ben CMM operatörüyüm. Bu parça ölçülürken 3 planes daha doğru olur. Ortalama daha doğru sonuç verir.

[@sushantkumar2631]

this is the best ever video on gd and t ..i have ever seen on you tube.........thank you 10000 times for that

[@guillaumevincent716]

321 is amazing I am still in shock its a revelation I can understand now the order of datum and why they are so important

[@epistte]

You are more complete than my professors were 30 years ago. They spent an entire 30 minutes on the subject. I learned most of it on the job. I had to teach this to my daughters because her profs didn't mention it.

[@infinitymfg5397]

Thanks a lot! I really enjoy knowing that people are getting something out of my videos.

[@houmadi2012]

I love your videos! Your delivery of the material is crystal clear which makes it relatively easy to understand the concepts. Please, please, please post more GD&T and engineering drawing videos. I'm struggling at work understanding engineering drawings and GD&T. Thanks!

[@infinitymfg5397]

Hi Sherri, I'm glad that my videos are helpful. Its people like you why I started this channel. I am planning to put up more videos, but the best way to make sure that you're not missing anything is to visit my new website www.theengineersreference.com/ You can get all of my updates and I will also start making my slides available to my subs.

[@obsidian9998]

Please continue giving more video. I like having the video's available for refreshing my ME major knowledge.

[@MdubFrederson]

This is awesome, please keep making these videos. There aren't any good GD&T resources on the net and you're doing a great job of conveying the information.

[@infinitymfg5397]

Thanks a lot Mike Walling. Its great knowing that people are getting something out of these videos. Don't forget to share this video.

[@MdubFrederson]

No problem. Definitely got a lot out of it and I would love to see more. I've been struggling with setting up datums, especially when the important features are holes and are angled to one another. There doesn't seem to be enough info out there on using holes as datum features which is crazy considering how many things bolt together. It's far less common for me to want to use 3 surfaces as my datums. Anyway, keep up the good work!

[@seenasrinivasa.r9191]

Mike Walling

[@JohnPaul-gh1fh]

Thank you for making this easier to understand..! Sure beats reading the flip book..!

[@tonyderywosh136]

Cmm programmer here , wish i had seen this video when i first started. Well done!

[@infinitymfg5397]

Thanks! That's quite the compliment!

[@maheshkakar2258]

one of the best video i have seen on GD&T

[@infinitymfg5397]

Thanks! I appreciate it!

[@massgass9131]

i mocked up my resume to get an inspecting job..and it worked...now I'm going into this job not really knowing anything until i watched this..definately needed the 3,2,1, rule

[@infinitymfg5397]

LMAO! Good luck!

[@user-gj8ss2rv7f]

Ty Mr.Cummins 😎

[@infinitymfg5397]

You're welcome and thanks for watching!

[@g89raul]

I paused the video in between to give thumbs up. Please keep making such videos.

[@infinitymfg5397]

Thanks for watching! I really appreciate it!

[@guillaumevincent716]

the 321 rules is a new concept to me its like if the clouds have moved and the light shined on my face.

[@davidlourensz4822]

Hi, thanks for this video that you have put together. I have a few questions for you regarding it if you don't mind - I know little about machining and my questions might be a bit basic: 1. Why would the basic dimension of 16 not be measured from B, as B would be a sure reference to measure from? Why would basic dimension of 34 not be measured from C, as C would be a sure reference to measure from? 2. What importance in terms of tolerance would 10 play, it doesn't seem to have any mention? The surface that it is measured from might be rough and inaccurate when compared to the other official Datum sides (AB & C). Is it not important as to the position of the hole set (the two holes) in relation to the boundaries of the rectangular block it goes through - maybe that block doesn't need to mate up with an adjacent component accurately, but just for it to be attached using bolts? 3. The slide with the 3-2-1 Rule at time 10:02 for example, shows the Right Hand Rule and the 6-axes of freedom. The axes don't coincide in those diagrams (although I can mentally rotate them and see what's going on)...generally speaking, the z-axis is the vertical axis (elevation view) isn't it - thought I would mention this as I think most machine set ups would be with the z-axis vertical (is this the case in industry standards)? Additionally, I know this might not matter, but do you have a preference to which axis has the 3, which has the 2 and which has the 1 restrictions for movement? 4. Why is the term 'counterpart' used, what does this mean in this context - I would imagine it means equivalent part? 5. At time 14:51 it shows the ABC Datums in the control frame and you mentioned that A-Primary, B-Secondary and C-Tertiary need to go in that order and that set up, so even though, some other arrangement of the stops to hold the part in place on the machine would ensure it does not move and all freedoms of movement have been stopped, why would this order be important? Is it related to axis preference or some other preference? AB&C would all be trued up and equally suitable for datums (or are they not?) - is it to do with their specific machining tolerances? 6. The (2x) indicates the two holes I would expect. 7. To achieve a diameter accuracy of 0.001 for example instead of the 0.06 for the holes, would this mean using a more accurate drill bit/chuck/more expensive machine in practical terms - which would make the manufacturing of the part a lot more expensive? Thanks for your help. Kind regards. David.

[@elaramars2854]

This guy teaches better than my professor at the college. Love the video.

[@subtle_info]

I really appreciate your effort and resources you provide thank you for making this video

[@infinitymfg5397]

Thanks for taking the time to watch and comment.

[@tjvanderloop1686]

Good Job with the 12-modes of motion or the 6-degrees of freedom...DATUMS are the key to any tooling set-up. Thanks! Thomas J. Vanderloop, Author, Technology Instructor & Manufacturing Contractor, CMfgE & LSME

[@danielpipersburgh1740]

Very Helpful!!! I have my final tomorrow! Thank you so so SO much!!!!

[@infinitymfg5397]

Thanks for watching!

[@stephenfischer5322]

Very informative and well done! I'm looking forward to your other videos for more information

[@abhinavmalviya1]

Just what I needed! Highly informative video. Thank you so much.

[@infinitymfg5397]

Thanks! Its awesome to know that this was helpful to someone.

[@Beggamus]

Very well explained. Thank you for the upload Sir.

[@deepakjadhav6438]

Very helpful very detailed ✌️👌👌👌

[@infinitymfg5397]

Thanks 🙂

[@srinivassomenahalli9457]

Very Informative -Thank you so much for this information please share additional videos on CMM Basics and measurements

[@infinitymfg5397]

Thanks for watching.

[@sanseng000]

Very clear cut, no nonense Next time will watch part 2, I am hooked. 👍

[@infinitymfg5397]

Thanks for watching!

[@devendrabakhshi179]

Excellent Explaination

[@173roberto]

I just didnt undersstand. With respect to datum A, how would I inspect the tolerance? actually that's something I want to know. How would I inspect that part if I had to measure it?

[@mithuns4302]

When you give 3 datums... it shows the inspector how to place the part while measuring THAT dimension. Rest on A align to B , anti rotate w.r.t C

[@rileyhubert359]

So happy rn... this really helps me in school while in the middle of this covid bs

[@nikj4351]

this person got so clear voice

[@infinitymfg5397]

Thanks!

[@birkanalismibulamadim]

do you plan to update your video according to ASME 2018?

[@orurenopapito]

Thank you so much, very helpful 😊

[@infinitymfg5397]

Thanks for watching!

[@SH-bl9wh]

Big thanks. You have good teaching attributes. Liked. Subbed. Commented. Looking forward to see all your other videos.

[@JOSECHAPAH]

Great video! Thank you very much, greetings from Mexico

[@infinitymfg5397]

Wow! Thanks! And thanks for watching!

[@eddcraft2260]

WHY are None of the dimensions given in relation to Any Datem?? The "A" has no relevance to the hole position, the "10" is on the far side from the "C" and the "16" is on the far side from the "B". Makes no sense to me.

[@ronmuse276]

I agree completely with Edd

[@somebodyelse6673]

First thing, that most of the information for that part is left off. I assume that was done to leave only the symbols that the Prof. wanted to focus on. My understanding of how "A" applies to the hole position, is that because the hole is actually 3 dimensional (a cylinder), the axis of the cylinder is to be perpendicular to plane "A". It made no sense to me until I got away from the idea that the view was a 2 dimensional drawing.

[@Fabtekcnc]

Edd is spot on. Terrible example "Professor" shame on you for adding to the confusion of GD&T. The primary "A" datum controls perpendicularity of the holes (cylinders), the "10" and "16" should be located from the datums B & C (or the datums need to be on the opposite sides where the dimensions are located from). it's fine that the "10" is not "Basic" and therefore it would be the drawing block tolerance which would apply not the positional tolerance, but for this basic lesson it probably should have all been basic dimensions located from their respective GD&T datums. It then would have been a worthwhile lesson . In the real world as presented it would force a call to the engineer and drawing change.

[@SS-lt7lk]

A,B,C in respect to What??

[@rameshhariharan2623]

Very good lecture easy to understand . Im from india

[@infinitymfg5397]

Thanks for watching!

[@James-fs4rn]

Well done professor!

[@infinitymfg5397]

Thankyou very much Sir!

[@subhashreemoharana5273]

Great training video.......

[@sabaripandian116]

BEST explaining , and neat vid ... THANK YOU INFINITY MFG

[@infinitymfg5397]

Thanks for watching! I appreciate it!

[@tommywiseguy]

Even though the 3-2-1 rule is common for establishing a coordinate system, it does not satisfy ASME 14.5 for a DRF. In your example, you would need to use 3 perpendicular planes. Datum A feature would locate on the 3 highest points, Datum B feature would locate against the 2 highest points and Datum C feature would locate against the single highest point on that surface.

[@navib8845]

i love this, helps me to undersatnd gd&t better. thank you!!!

[@daledavis4248]

Really enjoyed this I am a Printed Circuit Board Designer in which we do a lot of GD&T,

[@Redspark77]

Excellent video. Thanks for your help.

[@prakhars440]

Nice explained

[@austinomonuwa8585]

Totally broken down! Thanks!!

[@SaxyBerto]

Good explanation. The only comment I have is your orthographic projection is 1st angle projection. North America 3rd angle projection is most commonly used.

[@mayureshkange6729]

Very informative video..!!! Thanks for posting it

[@infinitymfg5397]

Thanks for watching!

[@frink32]

Brilliant Dr. Cummings! Subbed and learning more!

[@infinitymfg5397]

Thanks for watching!

[@143nomula]

very useful information.... thanks you sir . we need more videos on gd&t ...

[@infinitymfg5397]

Thanks a lot! Thanks for watching!

[@parijatprabhudesai]

How come the dimensions do not start from datum planes? They're all from the opposite plane. Don't all dimensions have to originate from or be traceable to datums?

[@agankachu09]

Why is the Z-axis not vertical to the horizontal plane?? In segment 9:09 I see Y-axis vertical to the horizontal plane. Is this a North American thing? Isn't Z-axis always perpendicular to the horizontal plane? I had a tough time getting my point across to an engineer in Ontario, Canada. I could make out he came from the Auto-CAD world (2D) where X-axis and Y-axis goes along the Length and Height of the monitor screen and Z-axis comes towards you - the operator. This is incorrect per me. There has to be some standard. To me Z-axis always directed towards the sky.

[@infinitymfg5397]

The orientation of the z-axis isn't tied to 'horizontal' or 'vertical' per-se. Typically, X-Y-Z and the left hand rule are centered on the concept of following the device (tool spindle, inspection probe, etc) That is what dictates the Z-axis, the X and Y axis depict travel relative to that. This is why you can have machines that are 'horizontal' and 'vertical', they are telling you the orientation of the spindle.

[@robertshreffler6155]

the teacher mentions Right hand rule in video, but L H rule in reply? the way I learned R H rule is simple, cross the X towards the Y and the Z will unscrew out of the plane. So that way you can place the XY plane at any orientation, and you expect Z to unscrew out of it. Take a look at a CAD screen and watch the results as spelled out here!

[@sandeephasija8604]

Great Video thanks

[@carlosvalverde2928]

English isn't my native tongue and I understood this better than my mechanical drawing classes

[@infinitymfg5397]

Thanks! That's awesome!

[@786Raam]

Simple yet effective explanation Thank uou

[@infinitymfg5397]

Thanks for watching!

[@saif-deenakanni1233]

Excellent video.

[@manuboker1]

Wonderful Lectures ! Thanks.

[@martingaribay8199]

Great training, could you upload GD&T tolerances for assemblies interaction.

[@genuzz]

Thank you for sharing this!

[@cinopacino]

kudos to you Professor, and much thanx for this easy-to-understand tutorial of gd&t basics!

[@infinitymfg5397]

Thanks a lot! And especially thanks for taking the time to watch and comment!

[@peteraguilar7181]

question when using an insert do I use MMC for hole?

[@63Ducati1]

A couple more points: 1) when Inspecting the part, you must hold the part against the B and C points. It's like putting the part in a vise using only the fixed jaw and a stop, without clamping it between the two jaws. 2) ANSI and ISO standards suggest that the arrows from the feature control frame point to the center of the hole, and not to some place off the outline of the hole. GD&T is about details. The (2x) below the frame makes me wonder why another box was not included in front of the feature control frame to indicate the number of times. Or maybe a break in the leader line would work. That 2X is important. I usually put mine above the left hand box (and ANSI wants 2X not 2x. This is from the drawing board era, where no lower case were allowed like they are now.) and since the information is essential, not a parenthetical suggestion, no parentheses are needed or wanted.

[@infinitymfg5397]

Thanks for watching and your feedback!

[@ayushpatil4001]

Thank you . Extremely helpful.

[@thevegg3275]

One other thing that minute 951 you said that putting the part on the three points eliminates the ability to go up and down it actually only illuminates the possibility of going down you can still go up, so could you explain that please

[@thevegg3275]

Hi Professor Cummings at minute seven you talk about the 321 rule and you have 3A, 3B, 3C. you seem to refer to them as three datum planes…when actually they are the same datum planes… so why would you call them ABC when they’re all co planer?

[@srinaths3772]

Very informative and helpful! Subbed. Looking forward for more videos like this from you.

[@infinitymfg5397]

Thanks a lot!

[@idasmith8644]

[Nephew of Ida] I guess this was the most important video of my live. Looking now for part 2. I am more 3D modeler and nobody complained about my drawings. Randomly luck. Because the professor on the training confused me with his explanation of the 3-2-1 rule. Thanks for the video.

[@myw67]

Thank you so much sir, you are a life saver.

[@infinitymfg5397]

Thanks for watching!

[@felipeperez-rp3rd]

I have a question about the theoretically exact dimensions, tolerances can be applied

[@OhEarchadha]

Great video learnt lots.

[@racingsimtools9672]

Good, down to the point video!

[@infinitymfg5397]

Thanks!

[@darshanshanbhag7332]

Kindly prepare video lecture on complete Gd&t and tolerance stack up analysis. Its my humble request to you

[@ssubashme]

Video AT 4.43 SEC, why basic dimension is not given from the datum. I believe the basic dimension to the hole should be given from the datum

[@infinitymfg5397]

Hi Subdash, You're very observant, the drawing is not perfect, but my hope that there is enough information to help people to understand how the datums are applied to the control frame.

[@ssubashme]

Thank you for the reply.

[@ObelixCMM]

They don't have to be dimensioned from Datum Feature. If the other side had basic from Datum Feature you could just subtract it.

[@DavidBrown-xe9mk]

GD&T cleans up linear dimensions. Thats the idea.

[@VivekAnandJ]

I have such doubts too. For example in the control frame, when tolerance is mentioned and later 3 datums are shown, doesn't it mean the tolerance is for the dimension w.r.t. the three datums? Sorry if I sound foolish. I''m learning

[@CNC__PRO]

great job sir

[@infinitymfg5397]

Thanks!

[@hellosweetheart3350]

Why am I choosing today to learn when I have a splitting headache?

[@theantichrist6524]

I'm a WELDER by trade but have worked with CNC In the past milling parts I like the video would like to see everything related to topic thanks

[@infinitymfg5397]

Thanks! Its great that you got some value in the video.

[@peterwalter2034]

So exactly how far away are the holes from Datums B & C? Shouldn't the dimensions be referenced from those 2 datums?

[@mithrandir1313]

Great Work!!

[@infinitymfg5397]

Thanks for watching!

[@lisaliisforthebirds1918]

I noticed the holes are not dimensioned from the datum surfaces. Wouldn't you want them to be?

[@VijayKumar-nx8oc]

Thanks for the video. Could you explain those datums and how to select those datums ?

[@osmanduman6085]

Üretime başlamak için, teknik resimde parçanın eni, boyu ve yüksekliği mutlaka verilmelidir.

[@dales855]

Great info. Thank you

[@Kenneth_H_Olsen]

How come the thumb rule axis, has Y axis on the index finger ( pointy finger), and X axis on the thumb. But the drawings provided, and on usual 3D programs Y is the vertical axis ? Y axis should be thumb , X should be index finger. and Z the ring finger . What is the benefit of schematic inconsistancy ?

[@bigbfromaz]

Radar Blue the letters X, Y, and, Z are just Letters that we refer to in order to label 3 axes in 3D space. If you learn and understand the concepts, the letters you use to define the axes often become irrelevant. For example, when I make a design and make the drawing for it, I primarily use the labels A, B, and C to define the datum features that restrict the 6 degrees of freedom in the part. When I send it to a shop for manufacturing, they may load the parts in their machines in whatever orientation they choose to manufacture the part in. The machines will have X, Y and Z axes labeled, but more often than not during the manufacturing process, the part will not be oriented so that it identically match the machine’s X, Y, and Z axes. However, as long as the part is fixtured in the machine in a way that replicates or simulates the A, B, and C datum reference frame, it can be made correctly and repeatably. Once the part is outside of the machine, we can then measure the part itself to determine the part’s own A, B, and C datum reference frame and the other dimensions that result. If we both had CMMs to measure the part with, you may set yours up in a completely different orientation relative to the machine’s own X, Y, and Z axis. But, as long as we both establish our datum using the same A, B, and C scheme, we will get the same results when measuring the part.

[@Kenneth_H_Olsen]

@@bigbfromaz I understand ! I have worked with 3D software onscreen, animation art . And relative new to Mechanics, have never operated a CNC (or CMM) only manual lathe. The Datum are loaded into the software, and the Machine determines what is X, Y, Z . Thanks for a rich reply .

[@StevenHaggis]

Silly question, but what is the diameter of the holes please?

[@akashsaxena192]

is it always necessary to set the part for machining w.r.t datums because sometimes for example in case of a bearing journal and shoulder we machine them together while holding some other features but in drawings we still give perpendicularity for shoulder wrt the journal, probably a similar video for parts like a casing with bearing could solve my doubt.

[@devendersinghattri4654]

Very informative

[@infinitymfg5397]

Thanks!

[@makismastro7533]

Sir ,the datums A , B, C are planar surfaces of the equipment.which has to be used for simulation.The points 3, 2,1 are the minimum ponits of contacts which the part shall have when it sets up on the inspection ot manufacturing equipment .This is what you are saying or I am wrong?thanks.

[@ankuraggarwal8006]

Great work sir!.

[@infinitymfg5397]

Thanks!

[@danaschoen432]

Please forgive me, but, since when is the "Z" axis not vertical, the "Y" out and in as viewed by the operator and "X" not right and left as viewed by the operator?

[@marbrydav9698]

Great video, thanks

[@MayurShewale]

you've mentioned 0.06 as 60,000 inches in the control frame. what does this mean?

[@KonradGAdam]

60/1000=0.06

[@thirumoorthi.c604]

HI, In geometric tolerance, what is the definition of ø 0.06? is it plus or minus 0.2 ? or other?

[@andyreiswig8908]

Thanks, you do a great job of teaching

[@infinitymfg5397]

Thanks! I'm glad it was helpful.

[@kayakjoe1601]

clear and straight forward

[@infinitymfg5397]

THANKS! I appreciate you watching.