Check tolerance code - please

[dwade]

I got this from craiger_ny last week when we were talking about adding MMC bonus from the datums to the profile tolerance.

I've tried several ways to do this with the analysis report coming out right. I have done +.02/-0 for the tolerance and all looks well until I print out my report analysis then it only shows the plus side from nominal. If I try to set it up like the code so my graphical will show +/-.01 then my bumnus does not show.


SCN4 =FEAT/SET,RECT
THEO/0.9378,0.7339,0.0191,0,0,1
ACTL/0.9406,0.7345,0.0192,0,0,1
CONSTR/SET,BASIC,PNT52,PNT53,PNT54,PNT55,PNT56,PNT57,PNT5 8,PNT59,PNT60,PNT61,PNT62,PNT63,PNT64,PNT65,PNT66, PNT67,PNT68,PNT69,PNT70,PNT71,,
DIM PROF4= PROFILE OF LINE OF SET SCN4 FORMANDLOCATION UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=NONE
AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
M 0.0051 0.0000 0.0100+HALFB+HALFC 0.0100+HALFB+HALFC 0.0051 0.0000 ------#--

TIA Duane

[dwade]

It works.... I made the changes and then didn't rerun the program.... Aduh!

[craiger_ny]

I might as well be the one to tell you that code will "work" but it is not sound from a GD&T standpoint. Clck here for an explination

Craig

[rebeldude]

Is it not possible to add MMC Bonus tolerance from the datums to the profile tolerance then?. I have been seeing this more often in prints, but didnt know how to do it with PC-DMIS..

[dwade]

Yes I remember the post. We are more than likely going to remove the MMC modifier from the FCF.

[craiger_ny]

Material condition modifiers on the datums are perfectly fine from a GD&T standpoint as long as serious consideration is given by the designer to the implications, especially when applied to the tertiary but that is a whole other conversation. In regards to the CMM however, you may as well ignore the modifiers on datums for profile call outs. As far as I know PCDMIS does not have an agorithm in place for this.

Craig

[Wes Cisco]

Is it not possible to add MMC Bonus tolerance from the datums to the profile tolerance then?. I have been seeing this more often in prints, but didnt know how to do it with PC-DMIS..

Read this thread, especially the post by Mark F. You can use what the modifers on the Datums allow you to pick up, but you can only do so by shifting your alignment within the amount you picked up from the modifers to bring your points into tolerance for the callout. If after reading the link, you still don't get it, send me a PM and I will try to explain better.

[kbotta]

Oh Goody! (sorry guys... you know...I LOVE this stuff )

kev

[dwade]

I understand the impications but... can we shift the datums using HLL in the software?

[Wes Cisco]

I understand the impications but... can we shift the datums using HLL in the software?

.


HLL? To the best of my understanding for ver 3.5 thru 3.7 if you use a modifer on a datum in the trueposition window of pc-dmis it tries to simulate a hard gage, and it will allow the datums to "float" within the amount allowed by the modifers, but the result that you get when you do this is really just a go/go no not an actual measurment. I think they changed this with 4.0 & up but I am not a 4head and don't plan to be any time soon. I have a document about this I will post in a few minutes.

[Wes Cisco]

Here is the doc. HTH

[craiger_ny]

This is all good and well but he is inquiring about profile. As far as I know PCDMIS does not have any option that accomodates material condition modifiers for profile of a surface. Be it a simulated gage or otherwise. Why do I fall into these profile discussions? Was this a trap?

[Wes Cisco]

This is all good and well but he is inquiring about profile. As far as I know PCDMIS does not have any option that accomodates material condition modifiers for profile of a surface. Be it a simulated gage or otherwise. Why do I fall into these profile discussions? Was this a trap?

Yes, this was a trap! LOL You are correct, the doc I posted is only about trueposition not profile. I really don't have anything else to add to this discussion except to echo my reference to Mark F's post in the other thread. I think after all the profile discussion of the last few weeks, if there were a better way it would have come to light by now.

[rebeldude]

I wonder why PCDMIS does not have the option for these modifiers in their software?

[kbotta]

They do. its called best fit alignment. Without going into detail...it can be done...
kb