OK, here we go. Ready?

I have Machinery's Handbook and it shows briefly how to calculate offsets when milling. I m looking specifically for offsets when milling at an angle, say 40, 50 even 5 degrees.

Looking online, there are very few explanations as to how it is done. I have made my own calculations using my own trig formula, but I come up with different answers than the Machinery's Handbook formula gives me. I assume I'm wrong and it is right, but for the life of me, I can't figure out how my calculations are wrong.

Simply, using the radius of the cutter, right angle triangles drawn inside the mill extending to the tangent contact of the workpiece, at the correct angle, I get to MY offset in 2 steps. The Handbook formula does it in one, but is a different result.

Thanks!

I have Machinery's Handbook and it shows briefly how to calculate offsets when milling. I m looking specifically for offsets when milling at an angle, say 40, 50 even 5 degrees.

Looking online, there are very few explanations as to how it is done. I have made my own calculations using my own trig formula, but I come up with different answers than the Machinery's Handbook formula gives me. I assume I'm wrong and it is right, but for the life of me, I can't figure out how my calculations are wrong.

Simply, using the radius of the cutter, right angle triangles drawn inside the mill extending to the tangent contact of the workpiece, at the correct angle, I get to MY offset in 2 steps. The Handbook formula does it in one, but is a different result.

Thanks!

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