OK, so I'm a little over 1/2 way in my Octave mandolin and I've hit a frustration point. I was trying to cut channels for binding with the StewMac router head and the added binding attachment. I'm getting tear out and inconsistent depths (the horizontal depth is fine, but the depth of the cut into the instrument body is whacky). I tried to cut the 3 mm of depth in about 3 or four cuts, but what should have been my last cut turns out to produce something that looks like a sine wave with a short frequency. I'm sure there's a trick to this, and I'm sure someone out there knows it. I would greatly appreciate your help.
By the way, when I got frustrated I sharpened up on of my chisels and tried that. I might work on softer wood, or maybe if I were better with a chisel, but that didn't really work either. So, any hints on that would be fine, too.
Thanks in advance for your help. (I'm on the road for the next week and may not be able to respond, but know that I will greatly appreciate any assistance!)