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Over pin dimension not correct


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Hello everyone,

So I am inspect a few gears on Gear Pro, using a rotary table. And some of the readings from the CMM are incorrect. Over pin dimension, major and minor diameters are incorrect. I am getting as much as .0001-.008. Yes. one tenth to 8 thousandths. When measured with pins and micrometer the dimensions are correct. I have requalified the probes that I am using and double check and recheck my program. I know my part is stable and isn't moving. What am I missing?

Thanks,

Lou

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Lou, have you posted a similar topic before?

 

 I have replied to similar posts many times, could be a number of factors :

Probably R/T Qual on actual part, chuck/clamping, probe/probing area. Are flanks straight or modified/crowned, etc ?

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Chris, that issue was due to a probe being to big to fit inside the root of the teeth. Have the correct now, but not sure what is going on. I qualify the RT and probes before running the parts. And flanks are straight and aren't modified or crowned.

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Chris,

Thank you for the reply. I was able to work with it enough to get .0007. But my results are still coming in undersized versus measuring manually.

Thanks,

Lou

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Lou, ok this is interesting, so did results change from 1st run by a large amount?

 Have you double checked  all of your numbers? is the PD or involute largely modified in any way? are you measuring at the PD? what if you try measuring at center face width (btwn tip and root), are results similar?

 

If Roman has seen your results, he will likely have a solid solution soon.

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Chris, 

No results did not change. But the dimensions actually got smaller. I have double checked the programs, I have even started over and rewrote new programs and nothing has changed. I have it set up on V-Circle-Center face width.

Roman does have my results and more info. But believe me, I am open to listen to anything (almost anything HAHA) the frustration is real. I appreciate all the help and info I can get.

Thanks,

Lou

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Lou,

feel free to PM me some charts (or .act file) to review, or gear data block from dwg, and program if possible...

 

Can this possibly be inspected for MOP on CMM with Gear Pro without R/T? for comparison, this will eliminate on potential source of error.  (Use any face and dia from top). I imagine you have already tried another probe to rule that out.

What type of machine / head are you using ?

 

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