Profile tolerance without any datum references would do exactly the same thing. Profile tolerance with datum references could do a lot of different things. I'll have more videos coming about that.

Could you please add video also about mathematically defined surface, why we use it ? Usage example etc .( asme 4.13)

Datum feature B is the pin. Datum B is the axis of the pin.

If datum feature B were referenced MMB, the gage would have a fixed size hole, but we don't have enough information on the drawing to calculate the size of the hole in the gage. As it is, with datum feature B referenced RMB, the hole in the gage is a variable size so that it can exactly surround the pin with no looseness.

@@davidslopsema4374 ok thankyou sir, for valuable replay

yup

It is not expandable past 40 lines. You would need to divide your stack up into two stacks and add the results.

You consider the first hole to be the center of the universe, and then with the other holes calculate position plus bonus plus datum feature shift. You can avoid a lot of calculations if you can have your inspection department give you hole sizes and locations and you can create a gage in CAD and create the part as measured in CAD and see if the part as measured fits on the gage in CAD. I explain this on my web page here: www.dimensionalconsulting.com/tolerance-of-position.html#cmm Otherwise if you need to do the calculations manually, I explain how to do that on my web page here: www.dimensionalconsulting.com/tolerance-of-position.html#advanced

@@davidslopsema4374 awesome. I'll take a close look. Thanks!

You will have no bonus and no datum shift, only the position tolerance in the feature control frame regardless of the actual size of the features.

I have seen this issue causing confusion when people do tolerance stacks. Other than that, I cannot point to any specific quality problems that it causes. It's just a matter of making the GD&T reflect how the part really functions.

Yes you would, if you want to allow bonus and shift, and/or if you want to use fixed size gage pins. If for some reason you could not tolerate the bonus and shift, then you would leave it RFS and RMB. It all depends on your product requirements.

Yes, the number following the U symbol is always outside the material. So if it were pointing at a hole, the number following the U symbol would allow the hole to get smaller. It can indeed control the size of a feature, but I still would not call it a feature of size. A feature of size always has a coordinate tolerance controlling the size.

I am not familiar with a standard method of reporting the data. I am guessing that would be determined by whoever requires the data.

I have used the method of reporting my tolerance / my deviation from tolerance. Example for bilateral would be +/- 0.25 / over / actual result. The result could be anything from + to - 0.25. Also - if you wanted to, you could report in the basic feature box the range that you found. Example: Feature is 40mm and you report 39.8 - 40.22 (all acceptable applying that tolerance). Make sense?

I forgot - when I do report actual readings in comparison to the basic features I do NOT accept or reject that data. The accept reject criteria is reported in the profile callout.