I have a complex job to cut out irregular and complex map contours in 18mm birch ply. I need to use a 3/17m (1/8") end mill as it give significantly better resolution over 4-5mm endmills. I ran tests yesterday on my 4x4 R&P cnc router, 2.2kw spindle table and lefthand downcut was the best, marginally better than a compression cutter.
The best result was with a brand new 3.17mm downcutter. 3 passes @ 6mm each, 10mm/s feed, 16,000rpm. No burrs and hardly any post sanding. Pretty happy with the results so far just want to tweak to get it right before I start on the expencive veneer faced ply!
My question is about pass depth due to the direction changes and the hours the machine and cutter will take to cut this job out.
Q: Should I reduce the pass depth, bearing in mind the cutter getting blunt over time?
Q: I also noticed some squeal from the cutter, should I reduce the rpm?