newbie roughing confusion

[dsjstc]

I'm roughing out my first simple part on a taig desktop mill with a 10mm
endmill. It's simple vertical protrusion on an aluminum block, which
seems like a pretty good fit for 2.5d roughing.The entire cut can be
done side-on, so it seems like I should be able to do volume roughing
that avoids plunging and slotting.

However, no matter which volume parameters I use, the first cut always
seems to be a full-width cut along the outside, rather than the 3mm
stepover I've specified.

Obviously there's a pretty big gap in my comprehension here, and I'm
curious what I should be reading in order to better understand the
parameters and how entry surfaces work.
Edited by: dsjstc

 

[ToolDude]

Try the constant load parameter with a helical approach into the part. That will maintain your 3mm stepover. I use that all the time with mill window and roughing routines.