Since my last post I went down to work with my CMM porgrammer on this. We were able to do this with PC-DMIS in Exact Measure mode with no problem. The software does work from a calculated center point but I am still not clear on how that is determined (by the software) since the an origin...
Thanks. Bear with me if I am a little slow here. In the FCF .000(M) | A | these studs are positioned only with respect to each other (and perpendicular to A) . As such there is no datum that specifies an X-Y origin. I am confused how (in the above example) stud # 1 would have a .001 positional...
Thanks, I just realized I made a mistake with my last question.
The area I am concerned about how to apply the tolerance in is the .000 (M) | A | requirement (not the .004 (M) | A | B | requirement). In that case, there is no X-Y origin so in the instances stated (,122 on 1st, .121 on 2nd)...
Thanks for clearing that up for us guys.
The one thing I don't understand is (when we will inspect these parts) how the bonus tolerance will be applied for the | .004 m | A requirement. If the one stud is .122 (.001 uhl) and the 2nd is .121 (.002 uhl, total .003) how is that applied (especially...
I may be taking a left turn off the beaten track here but if MMC were added to the .004 TP requirement on the (2) .752 holes, how would that be interpreted? That is, if the TP .004 effectively tolerances the center to center distance between the holes to +/-.004 (as the OP suggests), then if one...
The (2) .119 diameters on the attached dwg are raised bosses. The .226 diameter is a hole. Datum A is the common planar surface these features are normal to. What we are trying to accomplish with the GD&T is first hold the 2 bosses center to center dim to .000 TP if at MMC with bonus tolerance...
MechNorth:
Just to clarify: are you saying use mulitple leaders for the .0004 requirement? That could get to be an awfully busy looking print.
Also, by qty's in brackets, you mean the 2X next to the R.0075, remove the parentethes? And by "..qty's generally precede.." you mean the 2X should be...
dtmbiz:
Thanks for your feeedback. The reason I questioned having to repeat the FCF for each segment was not corner cutting but because the dwg you are seeing attached here is a blow up of a blow up detail . This view on a std 8 x 11 1/2 (typically size sent for quoting)is quite small even in...
OK, thank you. Please help me clarify:
1) Ok, I got the part about using a different letter set for each specified area, and that "between" arrows must be used (not dashes - our bad). As I stated in the OP, only the profile areas designated are critical to the application,and that all else is...
pmarc,
I am just reading this post to try to better understand the simultaneous requirement rule.
In your dwg (case 1a)is it automatically implied that the rectangular feature on one end is held at a basic 90 degrees to the rectangular feature on the opposite end even though the first is...
Thanks everyone for all your input. I had not been aware of the simultaneous requirement rule. Having just read it in section 4.19 Y14.5Y 2009, I am still not sure I have my head completely around it, but I can see where it applies in this application.
I have an application of profile tolerancing on a gage. There is a cavity in the gage where portions of the inside profile are very critical, and the remainder much less so. In the attached dwg, the portions designated y-z and w-x are the critical areas held to .0004 profile. The remainder is...
Datum A includes the entire profile surface: the 4.00R, the (2) 25R, and the short flats on both ends. I an sorry I failed to indicate that better.
PC-DMIS CMM software accepts contoured shapes like this as a primary datum. I do not understand exactly how the algorithims work, but conceptually...
Thank you all for your valuable input. I did get the answer I sought.
I agree, an A to B indication should be included to define the extents of the profile.
Steve, I do not believe one would not be able to fixure to this datum surface. A DCC CMM with scanning software such as PC_DMIS CAD ++...
