Homebrew PCBs

>try to figure the feedrate on 0.001" per revolution when plunging 
>into the (you put the right material) pcb.

I've seen .002" per rev recommended elsewhere. But, because we're 
talking short travel that means a high start velocity and high 
acceleration. High start velocity can cause vibration which is a no-no 
especially when the bit is in the board and the Z axis is changing 
direction. The smaller the bit the more likely it'll fail.

--- In Homebrew_PCBs@yahoogroups.com, "Zoran A. Scepanovic" 
<zastos@...> wrote:
>