Hi,
another small point worth bearing in mind, the smallest 2 flute mill in the list is 0.032" or 32 thou.
You are using 0.02" 20 thou. The larger 32 thou tool has 256% greater cross sectional area than what you are using
and will be much stronger as a result.
I used to use 16 thou (0.4mm) tools. My target is to produce pads with minimum separation of 0.6mm consistant with
SOIC ICs. I got a good price on 20 thou (0.5mm) tools and the increased strength has helped my cause much more than
I expected. The larger tool has 156% the area of the 16 thou tool, hard to credit such a small variation can have such
a dramatic effect.
As I've mentioned I use a software tool called Autoleveller and that has resulted in very very much more precise machining
thereby minimising the amount of fibreglass that gets cut with major increase in tool life. Likewise when I started using
flood cooling, mainly for chip evacuation I got a 20-30 fold increase in tool life.
While these techniques probably will not be useful to you given that you are cutting wood I mention them as examples of small
changes that have had dramatic effects. Keep experimenting, eventually you'll find the right combination that maximises what
you are doing. You'll need a quite a few tools to experiment with. When I get home I'll flick you drillmans EBay store,
Kyocera Tycom tools at very very sharp prices, I buy the vast majority of my micro-tools from him.
Download a trial copy of HSMAdvisor, very useful. Surface speeds are critical parameters particularly in metals. You can get away
with less but very seldom more than recommended speed. With such a small diameter tool you'll never get even close to the
recommended surface speed, the best you can do is spin it as fast as you can. Is your spindle rated to 24000 rpm?
If so why pussy foot around spinning it at less than max, do you disbelieve the spec?
Craig