[Da...] Posted May 3, 2018 Share Posted May 3, 2018 Hello guys. Can you please help me with this. I need to check true position of thoose 4 x M3 holes. The engineers are pretty sure that the holes are in spec but cmm says the are not. I was asked for best fit but to be honest I do not know how to do it. My aligment is plane A then circle D in XZ and roatation in Circle E. What is the best method to check this true pos ? Sorry for sh*t drawing. Link to comment Share on other sites More sharing options...
[Ra...] Posted May 3, 2018 Share Posted May 3, 2018 Are you looking for GD&T requirements for evaluation or a Calypso-specific strategy for how to create a best-fit characteristic? Link to comment Share on other sites More sharing options...
[Da...] Posted May 3, 2018 Author Share Posted May 3, 2018 Calypso-specific strategy I could say. Link to comment Share on other sites More sharing options...
[Ro...] Posted May 3, 2018 Share Posted May 3, 2018 Because your FCF is only to AD & AE, rotating to DE may be over constraining the part, which could make a good part show bad. If you feel the need to constrain rotation (i wouldn't), use the M3 holes on each side to do so, that way everything stays local. i would also suggest using thread locators or maybe even (Gasp) cap screws in the holes, as tiny holes are generally made using taps instead of thread milling, and will look like crap under magnification. Additionally make sure your "additional position results" is turned on, that way you can see your X&Y locations compared to nominal. Link to comment Share on other sites More sharing options...
[Ra...] Posted May 3, 2018 Share Posted May 3, 2018 Agree with the potential for over-constraining AND additional positional result. Over-constraint is still somewhat likely because Calypso will inherit the base alignment - which is locked in rotation by -E-. But, let's not worry about that for now. In your position strategy, use the "Best Fit of Bore Pattern" button at the top. Your feature will now be a Bore Pattern. Click on that bore pattern to open a new window. The rest is fairly straightforward, but I'll suggest you uncheck "Translation" for evaluating the pattern; the two holes at each datum aren't constrained in rotation. From your print, you'll do this twice - once for each pair of holes. Additionally, I suggest you include a separate characteristic for each (4) hole position to -ADE- for machine reference. Hope this helps. Link to comment Share on other sites More sharing options...
[Za...] Posted May 3, 2018 Share Posted May 3, 2018 Link to comment Share on other sites More sharing options...
[Da...] Posted May 3, 2018 Author Share Posted May 3, 2018 Thanks guys I'll try it. Link to comment Share on other sites More sharing options...
[Me...] Posted May 4, 2018 Share Posted May 4, 2018 Jach Sutton, From which book you have this Best fit print out. or you created your own Link to comment Share on other sites More sharing options...
[To...] Posted May 8, 2018 Share Posted May 8, 2018 Nice work Zach Link to comment Share on other sites More sharing options...
[Aa...] Posted May 8, 2018 Share Posted May 8, 2018 Indeed, it looks like something someone put together for a Calypso training course. Was it yours, Tom? Link to comment Share on other sites More sharing options...
[Za...] Posted May 9, 2018 Share Posted May 9, 2018 It's taken from something I've been working on. Thoughts & criticisms are welcome Link to comment Share on other sites More sharing options...
[To...] Posted May 9, 2018 Share Posted May 9, 2018 Please sign in to view this quote. No, but it reminded me of one of mine. Thanks! Link to comment Share on other sites More sharing options...
[hu...] Posted April 23, 2020 Share Posted April 23, 2020 Sutton's post is great! Thank you! while, i have a question about step 9, why translation is also permitted? in my view, it is constrained by datum B. Could anyone please explain me the reason? thanks in advance! Link to comment Share on other sites More sharing options...
[An...] Posted April 23, 2020 Share Posted April 23, 2020 Please sign in to view this quote. Datum D and E is in the play. Two different DRF's: 1.) AD means rotatory fit only of two threads (left side) 2.) AE means rotatory fit only of two threads (right side) No translatory fit. There is no common request. Link to comment Share on other sites More sharing options...
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