Rule #1 in GD&T for Size Tolerance

[@nodrip1]

Explained plainly and straight to the point. Another great video. Thank you

[@chaitme]

Awesome quality video that clears the understanding! Great work!

[@MrEngineerNasa]

i like your videos best so far, you are nr one one you tube... you explain it very vell and i get everything at once

[@gmarinelarena8675]

Thank you for sharing your knowledge in such an easy to understand way.

[@whackycracker1987]

Very helpful thank you!

[@armandmatossian2081]

Fantastic videos! Such simple and to the point videos!!

[@e-learningpartners]

This is great Scott thanks for sharing!

[@gokhancimen2589]

excellent video congtraz

[@chenjason2598]

like the explanation, to-the-point.

[@hoguemr]

Thank you! I'm taking an SAE GD&T online class for work and the way they talk about all of these things is not clear. I guess I'm going to be doubling up and watching your videos at the same time

[@GeoTolPro]

Glad it was helpful!

[@jasondean37]

This guy is probably the most clear GD&T content online. His course goes way back, and this guy does too. Took an entire SAE course and found myself falling back on this guy.

[@guadalupemunoz9920]

This remind me one of the fist video when you did with your father.... regards from México

[@pravinaher4720]

Excellent explaination

[@alfredogutierrez669]

great explanation! thanks

[@kevinchristian7396]

Great Job

[@cppc7308]

Thank you so much. I appreciate so much

[@saurabhroy7100]

I don't know when you will give me reply but I have a doubt. If Rule 1 of gd&t can control the form of the pin then what is the use of straigness . Rule 1 or envelope rule keep the pin in side the envelope and straightness of axis of pin also control to keep axis in a certain envelope, thus it keep control the straightness right. So what is the use of straightness when Rule 1 is there?

[@GeoTolPro]

Straightness and other form controls are not needed on features of size in most cases because rule#1 takes care of it. There are two types of straightness: straightness of a median line relaxes rule#1 and allows a greater straightness than the default rule#1 and size. Straightness of line elements tightens the straightness allowed from rule#1. Again, these are both pretty rare and only used in special situations.

[@冯孝伟]

Hello, based on the rule 1#,when the size is at MMC, would the circularity must be zero? if not, how would the form be perfect? thanks.

[@GeoTolPro]

Yes, perfect form is required at MMC. Keep in mind this is the hard theoretical limit. Manufacturing instead shoots for the nominal or mean size to allow room for variation of both size and form.

[@oscarloredo5053]

Which book should I get on gd&t??

[@GeoTolPro]

The GeoTol Pro 2020 book is our latest and best seller. It is also available as digital access. geotol.com/product/new-geotol-pro-2020-fundamentals-workbook/

[@QwertyCanada]

Does the rule control parallelism as well?

[@GeoTolPro]

Size tolerance controls the thickness and form of a feature of size. It does not control relationship to other features.

[@QwertyCanada]

@@GeoTolPro yeah I noticed that in the standard as well, what I don't understand however is that in some texts other than standard, it is mentioned that envelope rule can control parallelism as well, maybe I'm missing out some details though