In my Woodworking adventures I have been attempting to cut Dimples or Pips in wood.
What I have discovered may be of interest.
The various methods I used.
1 . Router cove bit in a Radial Arm Drill.
This worked to a varing degree and gave equally varing results.
However a drill press cannot obtain the RPM expected for routing good results.
2. Hand held die grinder and carbide bit
Fail (see the raggedy yellow pip)
Too hard to hold in position
3. Die grinder in drill Press
Produced reasonable results but again does not now spin at the accepted speed.
As a result it tends to clog dead center and burns the wood.
3 HSS rotary rasps
constantly clogged with wood
almost useless, sorry about that supplier!
So how do you do it with acceptable results.
Use a INSTY BIT (If you can buy one)
Bench mount somehow a carbide die grinder in a drill press, or a dremmel.
Grind a twist drill with a curved cutting edge, or
And possibly the most appropiate these days
Use a CNC
-- Regards Robert