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I'm having an issue with hole diameter in a plastic injection part. The hole is out of round approx. 0.020" I've run a scan of the diameter and exported the results into an .iges file to evaluate it in CAD and that correlates well with the roundness calculation from the dimensioning menu. Another way I have evaluated the diameter is to take 8 hits individual hits inside the diameter and created 4 distances. However, for the part program report that goes out to the customer, I am reporting out a Diameter, based on an auto circle (2.5 dia hole - 32 hits). How is this diameter calculated in an auto circle check? I assume it is an average of the 32 hits. Also, what do you think is the best way to measure and report out the diameter of this circle based on the fact that it is out of round? The customer's preference is for a single dimension on the report. I am thinking the best solution might be to report out the largest diameter using a distance check from 2 opposite points (the wider dimension is always in the same direction) and then report out the roundness using the auto circle feature. Comments or suggestions?
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There are several ways to ahve Pcdmis calculate the diameter of the tip, and they are in the AUTO-FEATURES CIRCLE menu. MAX-inscribed will give you the size of the biggest round pin that can go through the hole, which would probably be the best.Originally posted by gcunniff View Postsigpic
Originally posted by AndersI -
You can select the following for circle diameters.
Least Squares - The way I understand it it is the average dia.
Max. Inscribed - The biggest pin that will fit in a hole.
Min Circumscribed - The smallest ring that will fit around a stud.
I'd report max. inscribed as it sounds to me as if you have a hole and then dim. the roundness too.Comment
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Too quick for me again! How many times has that happened?Originally posted by Matthew D. Hoedeman View PostComment
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For diameter on plastic........gage pin & keyed in dim.sigpic.....Its called golf because all the other 4 letter words were takenComment
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This forum is like the Hoedeman hotline.
The problem with the gage pin method is that I don't have a 2.5" gage pin.Comment
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To give you a more accurate description of the part, it is a bore with threads on the lower half. The print gives me a call out for the gage point inside the bore, which is why I inspected it as a circle and not a cylinder.Comment
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WHATTHEHELL kind of lab are you in that you don't have a 2.5" gage pin? Same as me, I guess!Originally posted by gcunniff View Post
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Originally posted by AndersIComment
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What you have gage pins...sigpic
if you had soap on a rope it would be tied to yer ankleComment
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I'm just happy we have electricity here.....Comment
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Oooohhh, and what sort of thing is THAT?!?!?!Originally posted by gcunniff View Postsigpic
Originally posted by AndersIComment
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I'm not sure on those. Try searching this forum or the PC-DMIS help.Originally posted by gcunniff View Post
Anyone else know?Comment
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When in doubt, post code. A second set of eyes might see something you missed.
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We don't have gage pins either - we have calibrated pin punches that range from .061 - 1"sigpic Life is not a journey to the grave with the intention of arriving safely, but rather a skid in broadside, totally worn, proclaiming WOW What a ride!Comment
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Can anyone tell me why I get a larger diameter measurement with the cmm than with a pin gage?11-21-2008, 05:34 PM -
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I know this has been covered before but I can't seem to find it.
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