[Ra...] Posted February 5 Share Posted February 5 See attached. The alignment is symmetry plane of -A- and -B- and then -C- point tertiary. Question I have have is how to get the MMC into the True postion characteristic for -A- (11.6 width) and -B- (16.2 width) regarding the 9.4mm thru hole? I currently have the symmetry of -A- plane as primary and symmetry of -B- plane as secondary. MMC is not an option in the characteristic with the symmetry plane alignment. Thanks! Link to comment Share on other sites More sharing options...
[Cl...] Posted February 5 Share Posted February 5 Constructing a Symmetry plane should allow you to us MMC. Link to comment Share on other sites More sharing options...
[Jo...] Posted February 5 Share Posted February 5 The Symmetry plane does allow MMC if it is the feature for evaluation, but the software doesn't allow MMB on the DRF. I'm not even sure MMB on Datum A would even do anything since it is parallel to the axis of the bore. 1 Link to comment Share on other sites More sharing options...
[Ra...] Posted February 5 Author Share Posted February 5 Please sign in to view this quote. Yeah I was a little puzzled at the GD&T in that regard Link to comment Share on other sites More sharing options...
[Jo...] Posted February 5 Share Posted February 5 I thought I had a workaround for you that I had seen before, but the software still doesn't allow it. The workaround was to create a perpendicular for each datum, then create two theoretical circle features and use PCM to right-click on the diameter box and add the get actual for the length of the perpendiculars. The thought was that it would allow you to add the modifiers to the circles, but it is still grayed out 😞 1 Link to comment Share on other sites More sharing options...
[Ch...] Posted February 5 Share Posted February 5 if I had to absolutely do this, I would end up creating a theoretical cylinder for -A- with data that matches the symmetry plane, and probably require a best fit position to get MMC of A, I think I have done it a few times actually. Link to comment Share on other sites More sharing options...
[Ch...] Posted February 5 Share Posted February 5 Id be curious if this works with symmetry plane MMC/MMB with the 2025 GDT Engine 1 Link to comment Share on other sites More sharing options...
[Ri...] Posted February 5 Share Posted February 5 Yes Link to comment Share on other sites More sharing options...
[Ro...] Posted Friday at 06:33 PM Share Posted Friday at 06:33 PM Why not use a formula for the MMB? Take -A- width and -B- width for use in the formula. Link to comment Share on other sites More sharing options...
[Ri...] Posted Friday at 07:05 PM Share Posted Friday at 07:05 PM Because that's not how MMB/LMB works. Please sign in to view this quote. 3 Link to comment Share on other sites More sharing options...
[Ma...] Posted Friday at 08:31 PM Share Posted Friday at 08:31 PM That's something i'll try on monday. Symmetry plane should give MMB - constructed symmetry from planes won't. 1 Link to comment Share on other sites More sharing options...
[Pa...] Posted Sunday at 02:38 PM Share Posted Sunday at 02:38 PM Came here to say what Martin and Richard said. The last programmer we had here worked 12 years in Calypso and did not know that symmetry planes could be constructed directly without point recall. Every manager needs to be reminded the difference between MMC and MMB so they can roll their eyes monthly. Link to comment Share on other sites More sharing options...
[Ra...] Posted Tuesday at 02:36 PM Author Share Posted Tuesday at 02:36 PM Please sign in to view this quote. I did measure the symmetry planes within the features/special geometries (not constructed) and toleranced the -A- & -B- distances 11.6 and 16.2 distances given for each. When I recalled the planes for spatial and planar alignments to report TP of one of the Ø9.4 cylinders, there was not an option for MMB. Using older 6.6 version Calypso 2018. Most likely approaching incorrectly but that's why I'm here. 🤷♂️ Link to comment Share on other sites More sharing options...
[Ma...] Posted 18 hours ago Share Posted 18 hours ago Well - on our Calypso 7.8 ( 2024 ) it can not make MMB on those symmetry planes, but using GD&T it's possible to use that. Link to comment Share on other sites More sharing options...
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