[Lo...] Posted May 5 Share Posted May 5 Hello everyone, I am inspection a gear with a Root Diameter of .1528-.1485 inches. I have measured all 5pcs on Gear Pro and gotten everything from .1632-.1643. I have put them on our comparator and they measure .1520-.1528. I have double checked the the probe and it isn't loose, and have qualified it and have measured a ring gage and all dims are correct. I verified the part isn't moving either. Have also qualified the rotary table several times as well. What am I missing? Thanks, Lou Link to comment Share on other sites More sharing options...
[Ch...] Posted May 5 Share Posted May 5 Lou, strange, sometimes you may get a smaller than actual size due to probe ball not clearing the full root, but I would agree this one makes no sense. what size ball are you using, what size is the root radius? is it full or fillet? Is this a gear or spline ? Did you measure TIP diameter ? Did this measure ok ? Link to comment Share on other sites More sharing options...
[Ri...] Posted May 5 Share Posted May 5 The most common issue I see with Root Diameter measurements is if it is a flat bottom root, and you leave Self-Centering on, it will sometimes roll into the corner radius of the root/flank and take the measurement there. Which is why I typically turn off the Self-Centering unless it is a full radius. 2 Link to comment Share on other sites More sharing options...
[Ch...] Posted May 5 Share Posted May 5 Good point Richard, yes this is likely the case. Link to comment Share on other sites More sharing options...
[Lo...] Posted May 6 Author Share Posted May 6 Please sign in to view this quote. Chris, I am using a .5mm ruby. And it's Root radius fillet of .0065 of an inch. So, I'm guessing my probe is too big?!?!? And yes I am measuring the tip and it is coming up undersized as well. Tip dimensions are .310 +0.0 / -0.001. Measurement is .307. Link to comment Share on other sites More sharing options...
[Ch...] Posted May 6 Share Posted May 6 sounds like a probe issue, is probe bending? can you try replacing the ball ? Have you confirmed the Tip Dia in Calypso ? The ball does seem too big for the small fillet, but it doesn't tell us how much space is in the root area, may possibly still clear. Is there possibly a flat on the ruby ? Are you measuring all gear test with this same probe tip ? Link to comment Share on other sites More sharing options...
[Lo...] Posted May 6 Author Share Posted May 6 Chris, If the probe is bending I cant visibly see it. I have replaced the probe and have gotten same results. Tip diameter is .503mm. There does seem to be enough space in for the size of a probe. And there isn't a flat the on the ruby. Lab let me use there microscope not sure the magnification but the ruby is not flat. And I am measuring the all the gears with same probe. Link to comment Share on other sites More sharing options...
[Lo...] Posted May 6 Author Share Posted May 6 Please sign in to view this quote. WRONG on the space for the probe. The probe is to big for these gears. I think even a .2mm may be too big but the company is willing to buy a few probes. So we will see. Link to comment Share on other sites More sharing options...
[Ch...] Posted June 10 Share Posted June 10 Pro tip : when choosing a probe for a gear, a quick check is to take an available ball size probe on hand you think will clear and hold it up to the light to see if it will clear the root, etc. Be very careful with 0.5 mm and smaller obviously. Good luck. Link to comment Share on other sites More sharing options...
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