Part measuring variation

[[Ol...]]

Dear All,

I have a question related with part alignment.

I am measuring a cylindrical part with 6 thins perpendicular with the cylinder.

The base alignment is done by bottom plane, line between bottom and top circles centre points, and a line at one of the 6 thins surface perpendicular to Z axis.

The problem is that when part is removed from the fixture and placed again, the measuring values specially, with the thins positions. that vary 0.7mm, depending with the part rotation that is placed at the fixture. The fixture does not keep same rotation position it varies at minimum of +/-1 degree.

How can I assure that the part will be aligned by measuring independent from part rotational position at the machine table? Shouldn't base alignment correct this degree deviation?

Your input is much appreciated.

Thank you.

[[Ma...]]

If you have used 2d line for stopping rotation, then it will rotate alignment on it's angle. But no one is saying, that it's at Y0 for example.

If you can - change that 2d line for a point.

You have to do more research of scanned data and observe where on part is those points taken.