Homebrew PCBs

>There is a bit of slop in the
>bearings, but I don't break too many bits.

I broke a .031" carbide bit yesterday trying to drill at a Z axis 
feedrate of 100 IPM and 30K RPM. Broke another this morning at 50 IPM, 
finally settled on 25 IPM. Vibration, runout, feedrate, RPM, material 
and bit size are typical suitability determinants.

--- In Homebrew_PCBs@yahoogroups.com, "Leon Heller" <leon.heller@...> 
wrote:
>