Defining GD&T Controls: Form, Orientation, Location, Profile, and Runout | Symbols & Tolerance Zones
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- เผยแพร่เมื่อ 8 ก.ค. 2024
- LECTURE 04
Defining Geometric Tolerance (GD&T) Controls:
Form Controls:
Straightness, Flatness, Circularity, Cylindricity
Orientation Controls:
Angularity, Perpendicularity, Parallelism
Location Controls:
Position, [Concentricity, Symmetry (eliminated in ASME Y14.5-2018)]
Profile Controls:
Profile of a Line, Profile of a Surface
Runout Controls:
Circular Runout, Total Runout
MEEN 426 Playlist:
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This lecture was recorded on April 9, 2021. All retainable rights are claimed by Michael Swanbom.
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Over the years, I've studied numerous video compilations devoted to GD&T but always gravitate back to the TheBom_PE series. Anyone interested in learning GD&T from scratch should watch this video series in order and read Chapter 20 on GD&T in Shigley's Mechanical Engineering Design. I cannot think of a more thorough and comprehensive starting point.
You were destined to teach because the way you convey information is just pure gold. Thank you.
Thanks for the encouragement! I'm glad you enjoy my teaching style!
providers
James diamond 🔹
Thank you so much for putting this series together. My GD&T background was always rough and after 10 + years, rusty. This course thus far, has been fantastic help in getting me re-cquainted with it. Thank you again!
I'm glad you are finding it helpful! Thanks for watching!
Everyone deserve teacher like you
Subscribed. Best material on GD&T ive seen so far. Not to mention, maybe the only one that is useful with great examples and explanations. Thank you very much sir.
This video is pure gold. Explained with the right amount of details to have a good grasp in understanding GD&T symbols and using them. The examples and tips offered during the profile of a surface explanation were very useful. Keep doing the good work. Greetings from Venezuela.
I've been binge-watching these GD&T lecture series and they are just the best. Awesome content and very well put together. Please also do a video on manufacturing drawings of complex assemblies.
Eagerly waiting for the next part. Thanks a ton!
Thank you so much for these lectures, from someone who graduated in engineering but was never taught this in college
Great job at explaining these concepts! I use GD&T quite a lot at work (metrology), and these videos have helped clarify some specifics for me.
Thanks so much for the awesome series. As someone who's never used GD&T this is exactly what I needed. One thing I'd add to the playlist is the video on the modifiers and examples of when they're used/why.
,
Ohhhh completed the GD &T series I just want to say thank you very very much. Loved your teaching
Glad you liked it! Thanks for the encouragement!
First of all sir thanks a million for these lectures ,you are illumunating us , I ve been waitng the LMC and MMC lesson eagerly.
Your series for GD&T is absolutely fantastic!!
Thanks! I'm glad you like it! Thanks for watching!
Fantastic. Looking forward to the next meeting. Please post when you can!
Wonderful Lectures ! Thanks.
Brilliant professor. This video is gold. Thanks a million
Thanks! I'm glad you liked it!
Two thumbs up!!
Thanks! Glad you liked it!
I thank you so much for this invaluable video!
I'm glad to help! Thanks for watching!
awesome again and great explanation !! thanks a lot for sharing
I am so glad you liked it! Thanks for your support!
Greate to see the usage of millimeter instead of the horrible inches, greatings from Sweden.
Thank you for sharing
Great lecture as always.
Glad you liked it! Thanks for watching!
Thank you so much sir ❤
Thank you very much
Please do a lecture on Gd&t application for a complex assembly .and how we should consider datums and symbols to be applied in piece parts and assembly levels.
if i have a pin on my part, should i tolerance it with a positional or circular runout tolerance? I initially used true position but I just recently found out about the concept of circular runout.
I just need some clarification. Whenever we see a dimension with a size tolerance together with a FCF with anything else than a form control sign (e.g. runout, perpendicularity) the envelope rule is waved, right? I mean, now these controls control the form on top of the size control, hence the virtual conditions. And like at 1:03:00 neither form nor total runout need to be within 15.2mm but the whole thing can not go beyond 15.22mm boundary, right? The size and total runout are independent measurements in such case.
Upload more lecture of GD&T. Its really useful
I'm working on it!
@@TheBomPE This is so great to see. Thank you for make your lectures accessible!!
thank you
I'm glad you liked it!
do you have solidworks top down assembly design video
Two points that I want to make:
1. I was waiting for you to go back on unequal profile tolerance zone with the U symbol.
2. It looks like if a surface is flat, you can control it with either flatness or surface profile. Is that correct?
Thank you sir how to reading final inspection drawing
why do we need position control is that important to use ?
Excellent job professor,✌ can I get any PDFs of your GD&T lectures?
I am new learner …❤
which control is preferred to use instead of concentricity?
Generally runout controls are easier to tool and inspect.
Hello, great lecture the same like previous three . What about real example, can you please take one real detail where can be applied all the controls and their mix for better understanding. I am mechanical engineer who has studied by GOST system. Thank you.
I'm working up to that! It is definitely something that I have planned! You have probably noticed my mini examples along the way as I cover the vocab and basics. I do those because I know that most people learn best by seeing an example then trying something themselves. But I feel that before I do a big in-depth example there are a few lectures of mostly groundwork to establish. Thanks for watching!
@@TheBomPE Thank you very much for you work! I appreciated it and I think not only me. I want to say that had not been familiar with GD&T at all in practical. I have passed through it in a university but a little bit and never used it. I want to cover this topic for myself. Maybe I will not be using it in future because I am working with sheet metal and steel frames (but I want to study other direction in engineering) and I have not seen GD&T in this area of manufacturing. However, for myself and to become better specialist, I need to know at least the language (which you have shown already). You are doing great job for many engineering people I am speaking about your entire channel. Thank you! :)
Hi, Some good stuff here but one minor point... ASME Y14.5 2018 no longer has coaxiality (concentricity) or symmetry, instead it just uses position. But it is good to still include it as it's still on plenty of drawings where an older standard is used. Assuming you are using ASME and not ISO!
58:17
Yes, I chose to cover the 2009 version of the ASME standard because I wanted my students to have seen those symbols in case they run across them on older drawings.
@@TheBomPE Good call lol. Folks at work didn't know concentricity wasn't a thing anymore until I mentioned it.
please upload remaining lectures
Thank you for your interest! As I develop more lectures that get to the quality I want, I promise I won't withhold them!
In your "Milling Machine Vice" example you sort of out yourself as havening not run a mill that much, or at least you are speaking to an audience whom you don't suspect as having much exposure to that machine. So, in the interest of "Constructive" criticism, allow me to offer the following. What you refer too as the "Bed" is actually the table. When a machinist sets up to make a part (that will be held in a mill vice) there are two procedures that he will accomplish. 1) He will bolt the vice to the table and "square" it to the table using a dial indicator. This will establish parallelism between the hard jaw of the vice with the theoretical (usually Y) axis. With that done he will go on to the 2nd procedure. This adjustment will establish perpendicularity between the Z and Y and Z and X planes. This is known as "Traming the head". In this process the machinist will put a dial indicator in the spindle such that it can swing (rotate with the spindle) a full circle reaching all points on the vice slides, then, indicating off of the vice slide, measure first in one axis and then the other (each in 2 places 180deg apart ) and adjust the head (again one axis at a time) to eliminate the difference in the readings front to back then right to left. Last of all, thanks very much for posting this (your) very helpful content.
Plz upload more lecture on this subject
I'm working on it!
@@TheBomPE Thank you professor for replying
Hi sorry but you are not showing all the drawings
what do you mean?