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Holes Normal to Contour.
- Thread starter rmaki
- Start date
rmaki,
I would not regard the note as legal, as per ASME Y14.5M-1994.
If perpendularity to the contour is what really matters, they could call up the contour as a datum, and specify that the holes are to be perpendicular to it. What kind of a contour is it, and how are you going to make the inspection tools?
I would use true position and possibly angle to locate the holes to a fixturable datum, and put a profile tolerance on the contour. I would think that locating the contour to the holes would be easier then vice versa.
JHG
I would not regard the note as legal, as per ASME Y14.5M-1994.
If perpendularity to the contour is what really matters, they could call up the contour as a datum, and specify that the holes are to be perpendicular to it. What kind of a contour is it, and how are you going to make the inspection tools?
I would use true position and possibly angle to locate the holes to a fixturable datum, and put a profile tolerance on the contour. I would think that locating the contour to the holes would be easier then vice versa.
JHG
- Thread starter
- #3
rmaki,
That is not far off what I was visualizing.
You can specify anything you want on your drawings, but if you cannot inspect it, you cannot control it. My interpretation of your original note is that the contour is being used as a datum. If so, your inspection tool will have to model your contour, probably at MMC.
Are you trying to inspect the contour, or the holes, or both? This affects how you do your drawings.
JHG
That is not far off what I was visualizing.
You can specify anything you want on your drawings, but if you cannot inspect it, you cannot control it. My interpretation of your original note is that the contour is being used as a datum. If so, your inspection tool will have to model your contour, probably at MMC.
Are you trying to inspect the contour, or the holes, or both? This affects how you do your drawings.
JHG
- Thread starter
- #5
What they want to control is "both" contour and the holes.
Contour have to be within the profile of the the mating part
and holes need to be at MMC in order to fit.
I never saw a call out like this one before. I think that true position will be the correct call to control the hole pattern to the contour datum.
Contour have to be within the profile of the the mating part
and holes need to be at MMC in order to fit.
I never saw a call out like this one before. I think that true position will be the correct call to control the hole pattern to the contour datum.
Yeah, I'd probably control the 'profile' of the part using profile of a surface. I'd then look at using position for the holes.
All related back to datums as ewh point out.
If the 'circular' portion of the U can be made a datum that may help with the perpendicularity of the holes on that surface.
KENAT,
Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:
All related back to datums as ewh point out.
If the 'circular' portion of the U can be made a datum that may help with the perpendicularity of the holes on that surface.
KENAT,
Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:
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