GD&T Lesson 7: Position Tolerance

[@mustafahayriatl2723]

I am literally writing down every thing you are saying then studying them. This channel is a gold mine if you're into GD&T. You're also making extra specific video's as well. They are like jewel in the gold mine for me.

[@RDeanOdell]

Hi, thanks so much for all your comments! It’s great to hear that my content is helpful to you.

[@mustafahayriatl2723]

@@RDeanOdell Thank you for putting all the effort to make these videos I really appreciated.

[@Ashnek34]

Great content, helps a lot to complement learning from a book and seeing it in practice.

[@RDeanOdell]

Thanks so much! I try to explain the concepts instead of repeating what is in the book. Glad it is helpful to you.

[@Invisibleman956]

Very Informative. however, you seem to have made a mistake at 31:00. The circle on Cartesian should have a diameter of 2, not 4.

[@sivachundi9387]

Good content. I like the way you related the profile tolerance and position tolerance in the beginning of the video. When you relate and explain things, it makes very clear for the viewers. We request you to make videos on how we can control symmentricity and concentricity using other control as the latest ASME version removed these 2 controls.

[@jaimeefayedawson1993]

I just wanted to say thank you - your videos have really helped me and I’ve just found out that I’ve passed the 2009 senior exam!

[@RDeanOdell]

Hi, Congratulations! That’s a serious accomplishment, that exam is tough. I’m glad my videos helped! Thanks for watching & commenting.

[@jafo3814]

I viewed 7 of the 8 video lessons you had on GD&T for review to take a quiz offered by AGI. I just took it and got 60 out of 61 questions correct. The questions were based off ASME Y14.5 2009. Thanks for providing the videos.

[@luisponce898]

You have been helping me since last year when I discovered you. Thank you!

[@RDeanOdell]

Happy to help!

[@Foreigner74]

Thanks Dean these videos are great. I appreciate you taking the time to make these. I've been an ME for 10 years and this is pure gold. You rock!

[@markmiguel7508]

Your videos are the best I've found on GD&T. You break down the confusing language of the standards in a way that is easy to understand. Thanks a lot for the effort you put into them. P.S. I like your micrometer tie pin :P

[@kylesharp9771]

Sir Odell thank you! you are the god of GD&T

[@RDeanOdell]

Thanks so much!

[@AndrewGrove-e7s]

Thanks for the clear explanations, I especially appreciate how you explain the difference between surface profile and positional tolerance. 👍

[@josebarrientos8079]

Really appreciate the way you explain with the detailed information thank you sir I have been increasing my skills since I look your videos thank you!

[@RDeanOdell]

Awesome to hear! Thanks so much!

[@tg5441]

Greatest video that resolves all the mysteries👍

[@megandjasper]

Your videos are the best, thank you so much. Our teacher doesn't teach; he just assigns homework from the book and has us read it ourselves. And the book's not very good.

[@amolaegade5428]

your knowledge of GD&T is just amazing.....I wish I had teachers like you back in college

[@ajaychidambaram]

Great content.. nicely explained.. thank you..

[@trexinvert]

In actual practice, the true position tolerance ="cylindrical" tolerance volume of the hole "axis" bounded by the diameter and material thickness... Quickly, just becomes a 2 dimensional tolerance of the hole center bounded by a diameter + bonus tolerance. HEre's how: Since, the true position feature control frame specifies that the "hole axis" must be "perpendicular" to surface A. Then, the actual measurement will be taken with a pin gauge that not only fits the hole but must also sit square to the inspection plate = [ - A - ]. So, it's "automatic" that the X[measured] and Y[measured] plus the Hole Radius will give the coordinates of a "perpendicular" axis.

[@Watchdog_McCoy_5.7x28]

How does "bonus tolerance" work when you have to document the dimensions on a dimensional data sheet? If your tolerance on the drawing is +/- .02", and your dimensions is out of tolerance according to that, but in tolerance according to the bous tolerance, what would you write on the dimensional data sheet? Would this be a legitimate concern? Would this be a drawing mistake? Not sure if I explained it correctly, but thanks for all your educational support.

[@crhee2074]

Amazing, really makes it easy to understand. Thank you.

[@Findmywa]

I am looking forward to this series. Great

[@StevenZoeZoe]

You are a great teacher and quite knowledgeable. You have def earned a subscribe from me!

[@RDeanOdell]

Thanks so much! I appreciate the subscribe.

[@sahebsuhail7490]

Great work, hoping you have a good life..

[@yogarajsekar9778]

Hello Dean, Can we assign position tolerance for the planar surface. I understand profile control is the preferred option, however I would like to know if that has been allowed. Please advice.

[@RDeanOdell]

Hi, we can’t apply position to a surface in the ASME system. It is not allowed. I think it is an option in ISO.

[@bradchenoweth6158]

Question: Can you use a feature control frame on a center-to-center distance dimension between 2 holes? It sees like this would not qualify as a "feature of size"?

[@RDeanOdell]

Hi, so the distance between the holes would be covered by a basic dimension. The feature control frame is usually associated with one of the size dimensions for the holes. You are correct that the distance between holes is not a feature of size, it’s a locating dimension.

[@hasnaouiomri7399]

Thanks a lot for your wonderful videos on a topic that is so ambiguous for many people. You made it very easy and very clear. Would you, please, tell me how to choose the exact value of geometric tolerance for a mechanical part during the design stages to be inserted in the feature control frame? All people are explaining GD&T by using an existing drawing. But none has explained how to decide on the exact value of tolerance inscribed in the feature control frame (for example Position tolerance value equal to 0.03, where does the 0.03 come from? Why it is not 0.05 or any other value? The numerical value is chosen based on what criteria or conditions? Thank you again

[@paullee4442]

Thanks for the great content! I was wondering how you tolerance a hole whose position in one axis is only given by a centerline? As a draftsperson is it acceptable/more efficient/more effective to draw a given dimension like that? How would you as an inspector evaluate that feature? Again, thank you!

[@eartheartbaratheon791]

How about a situation in which (18:30) such block has a rectangular slot on a side and the primary datum is a derived median plane of the whole block (side has for example 80+-0.2 length) and then the position of the slot has a width with a tolerance and position callout referencing the primary datum? How do we determine the true position of the primary datum and then the tolerance zone for the slots position? Just imagine a vice to simulate it?

[@shlomobachar4123]

How do you give position tolerance to holes that are normal to and on a curved surface? For example set of holes that are on a cylindrical large tube (harder case would be holes on a double curvature surface)?

[@RDeanOdell]

That’s a great video topic. The short answer is that that the true position comes from the datums. In the case of a tube, the holes are positioned to the axis of the tube and one end, not to the surface.

[@shlomobachar4123]

@@RDeanOdell Yes but what if my surface is somewhat arbitrary? ie not axisymmetric say like a surface of a car?

[@eartheartbaratheon791]

How does the intepretation differ in 22:00 when instead of basic dimensions you're given general dimentions?

[@marioguerrero6932]

Hi Dean, could you please explain in a video how to inspect a part in a checking fixture?

[@RDeanOdell]

Hi, I address your question in this video: GD&T: Inspecting Position Tolerance with Bonus Tolerance Calculation kzbin.info/www/bejne/hnnVqp-Eg8x9mJo

[@satyabarua]

Hi, I am learning a lot from your videos! Great content! Within my company, I tend to orient or use the hole positional tolerance from previously released drawings. Is there a standard exists that specifies positional tolerance for holes according to machining operations?

[@ariel59864470]

⭐Every video is perfect⭐

[@RDeanOdell]

Thanks so much!

[@sinasahebghalam8737]

Really nice video, only if you can sort the videos in the playlist it would be awesome.

[@RDeanOdell]

Thanks so much! I made a few more playlists sorting the content.

[@sinasahebghalam8737]

@@RDeanOdell Thank you so much Sir

[@souravdas1751]

Do we really need. All three datum in control frame for position tolerance. Is one not enough

[@AmarGirase-d2t]

How to create common zone between 02 angular holes on circumference of cylinder

[@vinnyq9189]

Hi Dean, Can you make a video explaining how to calculate bonus tolerance for a rectangular slot if MMC was called out. Both length and width have different tolerances, let's say width +/- .001 and length +/- .002. Also how to calculate the bonus tolerances of the square slot? Can we apply the same principle of bonus tolerance of the hole slot for the square slot as it deviate from the MMC ? Never thought a question like that would pop up on an interview with the hiring manager. Thank you sir

[@mikejankowski6321]

Don't let the different values throw you (the length and width are probably different too) - MMC is still MMC in each direction. Then you just subtract the Position tolerance to get the Virtual Condition. That is the envelope you cannot violate with the produced part.

[@adwaibowlekar3943]

hello sir can you please make a video explaining figure 4-16 from ASME Y14.5 2009 regarding MMB calculations ?

[@Abcd-zk5so]

Please explain different between diametrical position and non diametrical position..

[@RDeanOdell]

Hi, in the 8th video in this series, I discuss bi-directional position tolerance zones which is essentially non-diametrical position.

[@SimpLeMan2888]

I like your tie, so I trust you

[@sharathgs19]

Well explained 👍👍👍

[@RDeanOdell]

Thanks so much!

[@LoneWolfStands357]

Awesome video!

[@RDeanOdell]

Thanks so much!

[@trexinvert]

Its 2023 and im reviewing, again. Always gets easier. Get more perspective. Lets just talk [basic dim]. WTF is that? Purpose is: a.) to transfer the x and y datums to a single point[x,y] b.) this point becomes a "datum origin" on the "plane" of the paper. [note, the concept of a datum point doesn't exist in strict gd&t]. c.) Now, compare "measured" hole center positions to this "origin". d.) if u love arithmetic you dont "really" need basic dimensions, you could still measure hole centers away from each "edge datum". e.) this is just a clever SHORTCUT to reduce math, but a nightmare "to explain" to smart students who have never used inspection tools.

[@coryhughespsu]

Thank you sir

[@RDeanOdell]

You’re so welcome! Thanks for watching & commenting.

[@minhtuan511]

Thank you :)

[@alonsoerickea]

due you are fucking awesome

[@JulianMancera-b6k]

This think is insanly hard and complicated

[@SquishMe]

Great content, you should have more views.

[@sivachundi9387]

Good content. I like the way you related the profile tolerance and position tolerance in the beginning of the video. When you relate and explain things, it makes very clear for the viewers. We request you to make videos on how we can control symmentricity and concentricity using other control as the latest ASME version removed these 2 controls.