Hi Guys
Thanks for the info so far. Just to clarify things I have a splined shaft which i need to copy for a customer, I can't get hold of the female part to check the fit of the part i make, so my intention was to draw the spline out, tweek the drawing very slightly to make sure it fits, and then use the drawing to cnc a tool to produce the splined shaft.

Thanks for the macro Kiwi, but i don't have solid works :violin:

It looks like I am going to have to grind up a tool by hand and give it a go.

Paul