Sine bar errors

[mklotz]

Marv,
Good analysis, however the accual error was an order of magnitude smaller at 0.0005" and didn't have a significant effect.

Thanks, Paul

I purposely used an (unrealistically) large error to demonstrate that even large errors in the roll spacing don't affect the angle accuracy significantly.

Sine bars are viewed by many as only measurement tools, meant to be treated with extreme care. What these analyses show is that it's perfectly possible to make a sine bar and stack blocks in a home shop that will serve for almost any but the most demanding angle work. This opens up the possibility to make the sine bar part of the milling setup, not just a measurement tool.

I've already described one of my homemade sine bars here...

http://www.homemadetools.net/forum/b...8996#post39492

It's supported many a setup in the milling machine over the years.