hexagon logo
Register Sign in
  • Replies 37 replies
  • Subscribers 19 subscribers
  • Views 623 views
  • Users 0 members are here
Options
Related

Bad GD&T prints

Calvin.Korver
Link to print https://drive.google.com/file/d/1PPWkIpGwM39PPnNyxP7Zwe0Rr7QkaRxh/view?usp=sharing

Only sharing part of the print for nondisclosure purposes, but there was a lot wrong with it. Thought I would share this since it has been so annoying for me.

They put a position dimention on many of the faces when they clearly needed/wanted a surface profile.
They also had an M modifier on almost everything including: datums that are planes, flatness, and one distance dimension

Currently talking with my contact to see if we can get this straightened out.

Anyone else deal with some bad GD&T?
Parents
  • Bad GD&T is what inspired me to start reading ASME Y14.5 & attempt to read ASME Y14.5.1.

    I needed ammunition for shootouts with engineers.

    In the process I learned that some of what I initially assessed as bad GD&T is actually fully compliant with the standard and the best way to control a unique feature or set of features.

    If you believe the drawing is wrong, be ready to cite chapter and verse from the standard, otherwise you are just whining.

    Regarding the application of position to surfaces: I think maybe that is an allowed practice with ISO GD&T. If your drawing is to ISO GD&T you need to be using those standards to evaluate. I have worked with engineers who were raised and educated in Europe then moved to the US mid-career and began making drawings that cited ASME Y14.5 as the standard, yet the engineer didn't know there was a difference so they made the drawing the same way they always had. . . Nauseated face Given the OP is also having issues with material condition modifiers applied to planar surfaces, this is probably just an engineer who doesn't understand GD&T.

    Model based GD&T is still the bleeding edge. ASME Y14.41 might be of some assistance to you if you are dealing with those.

  • in reply to Wes Cisco
    Thanks, I will have to check that out. I don't have a hard copy reference book with me in the shop it would be nice to pick up. I knew it was possible to get a position of a surface, but with the other fishy stuff going on I sent them an email, and got the ok to change some things.
Reply Children
No Data
© 2024 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement