Originally shared by Nathaniel Stenzel When making rough cuts,

Originally shared by Nathaniel Stenzel

When making rough cuts, do you sometimes try to cut a certain distance from where you actually want to cut so that you have little to cut during the final cuts. I mean, if the right side of a wall that you want to make is at X30 and X40 would make the cut there, do you ever back off to X45 so that you do not have as much for when you cut at X40? I guess it would be a rough rough cut. I think it might make for neater edges as long as you do not edge up yanking out chips or wood fibers.

Your thinking is spot on. Make your rough cut to hog out material and then use your finishing cut to make it pretty.

In this case (using a knife edge cutter) the difference between heavy cuts and finishing passes is 10 thousandths and 5 (maybe less) thousandths.

The CAM programs I know have a ‘skin’ depth setting for roughing operations for this.

Yes I generally will use a “roughing” endmill then come back with a new sharp endmill to make the finish cut…

You can see in this video the difference between the finish created on the ways of the pocket during roughing and the final pass that leaves a much smoother wall https://youtu.be/fma_wuE9dx4?t=3m15s

Another bit of info I just recalled. I’m fairly sure roughing passes are milled with conventional cutting and the final is done with a climb cut. My memory on this point could be fuzzy out completely wrong. If so, I’m sure someone that actually has a running mill will set me straight.