Spline pitch diameter as a datum

Good morning,

We've been asked to measure runout of a hub flange, and position of holes in the hub to A-B. A is a bore at one end of the hub, and B is, it looks like anyway, the pitch diameter of an internal spline. The pitch diameter is 47.625 mm and the spline is situated inside of a tube with a clearance diameter of 59 mm. We are using a global machine, and our soft ware is PCDMIS 2021. We don't think we can do it. We're going to ask engineering if we can use the minor diameter of the spline instead. We thought we'd run it by the big brains, just in case someone has a better idea.

Thanks.

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Flintstone over 2 years ago

Thanks guys,

Some of this is kind of what we were already thinking. We actually make this part in house and it's assembled into our own product. Apparently, we haven't been checking runout to A-B, just checking diameters and such. Someone decided to outsource it, and now by our own rules, we are forced to check a sample from the vendor. We did find a go-no gage for the spline, but it won't work to check runout. The vendor sent us results they said they got with a CMM, I'm almost afraid to ask them how they did it. This is going to be an adventure.

Appreciate your help.
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Flintstone over 2 years ago

Thanks guys,

Some of this is kind of what we were already thinking. We actually make this part in house and it's assembled into our own product. Apparently, we haven't been checking runout to A-B, just checking diameters and such. Someone decided to outsource it, and now by our own rules, we are forced to check a sample from the vendor. We did find a go-no gage for the spline, but it won't work to check runout. The vendor sent us results they said they got with a CMM, I'm almost afraid to ask them how they did it. This is going to be an adventure.

Appreciate your help.
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