Hi guys.

Can anyone give a good rundown on the parameters for the different lead-in and leadout moves?

Imagine I'm trying to profile around a circle, what I'd like to avoid is the machine drilling straight down, then going around. I find this gives an unsightly cutter mark where the drill down lead in and the raise tool lead out happen.

So I'd like to get to grips with both the tangent and the spiral entry/exit. But I'm not having much luck.
Spiral seems to result in the cutter dancing between passes, the tangent results in cutviewer showing the cutter blasting straight through the piece I'm cutting.

So on a 25mm circular profile, what parameters do I use to get the cutter to spiral down in, taking maybe 1/3 of the circle to reach cutting depth of 1mm?
I thought this would be a spiral angle of 120, but that just drills down to full depth, then does the circle.

Can the tangent lead in/lead out be made to do a straight line instead of an arc? Can the length of the lead in/out be controlled?