I got the Ridgid laminate trimmer after all (a different deal at HD this week combined with a wrong label on the stand meant I got it for $104). I was putting it through some tests today, mainly rounding over small - 2 to 2.5" square, 1/2"- 3/4" thick - pieces of poplar and maple.
I used a 1/8" round over bit on the smaller ones and a 1/4" Roman ogee bit on the bigger ones. Both cutters were out-of-the-box new. I made sure the work was done in passes not exceeding 1/8" at a time.
I started with speeds appx. 24,000 rpm.
I noticed a tendency to burn close to the corners both at the entrance and at the exit (about 1/4" each) of the cutter, only at the cross grain ends. Along the grain all seemed OK.
I suspect this is due to slowing down of the feed at the corners. The exit burn seems to respond to exiting out of the cut fast but the beginning of the cut is a bit of a problem as one hunts for the bearing contact with the workpiece.
The burns got worse with the bigger cutter. I thought I improved things somewhat by slowing down to 20,000 rpm (slowest the trimmer will go) but by then I run out of pieces.
Apart from doing this on a table (convenience of doing this with the trimmer is, however, significant and the shape of the work was pretty good for a small hand-held tool) can anyone suggest a technique to minimize the burning? What tricks do people use when going round corners?
Finally, sanding out the burns is only partially succesful. Can you hide them with dark stain/Danish oil?