hexagon logo
Register Sign in
  • Replies 6 replies
  • Subscribers 221 subscribers
  • Views 69 views
  • Users 0 members are here
Options
Related

Spline pitch diameter as a datum

Flintstone
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.
Attached Files
Parents
  • If the major or minor of the spline is made by the same tool (if shaved), you can use that instead.
    If it was a full broach, you can't do that... technically, unless you KNOW the OD of the broach matches the pitch.

    Otherwise, you can get a mating spline with a shank coaxial to the spline and use it. Put the plug in the spline and measure off the shank. Like those thread things they sell, just a LOT more expensive.

    If this is something you sell to a customer that is going to inspect it, ask that inspector how they do it, and mimic it.
    At least that way you are both getting the same answer.
Reply
  • If the major or minor of the spline is made by the same tool (if shaved), you can use that instead.
    If it was a full broach, you can't do that... technically, unless you KNOW the OD of the broach matches the pitch.

    Otherwise, you can get a mating spline with a shank coaxial to the spline and use it. Put the plug in the spline and measure off the shank. Like those thread things they sell, just a LOT more expensive.

    If this is something you sell to a customer that is going to inspect it, ask that inspector how they do it, and mimic it.
    At least that way you are both getting the same answer.
Children
No Data
© 2024 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement