GD&T drawing feedback 4

[panzer32]

Hello, I'm a recent mechanical engineering graduate. I'm currently out of work so in the meantime I decided to study some GD&T skills (since we basically learned nothing about GD&T in school).

For practice I took a part found in my old graphics text and drew it in a trial version of autoCAD using what I know of GD&T principles. The actual tolerances that aren't specified in the original drawing I mostly just made up but hopefully are reasonable.

Here is the drawing from the text -

https://lh5.googleusercontent.com/_...AAAAAAAdk/fdPsNQcSnnU/s912/IMG_0900 small.jpg

Here is my drawing -

https://lh5.googleusercontent.com/_...o/Ork01ZT_3fM/s912/Graphics Txt Fig 11.51.jpg

I was hoping to get some feedback whether I am on the right track or not, especially with setting the B and C datums as the two holes - is this done properly? I would be grateful for whatever feedback you can give me. There are a few niggly bits which I'm not satisfied with but I'm not sure how to change in autocad, like the centrelines not having the short crosses in the centre of the circles.

 

[fsincox]

JP,
I hope so.
I have seen so many problems caused by the limitations of implied title block tolerances over the years that it is hard not to speak up. It seems the forward/preface to the new standard says almost the same, saying something like, direct tolerance methods are only really apropriate for FOS. I don't have it here with me now.
Frank