Can someone tell me the smallest size this can scribe text (Ariel Font for example) onto a brass blank? In mm?
Also does this handle cutting/engraving Sterling Silver as well as brass and aluminum? Would this be possible or is it too intricate of a design? (See pic)
You may want to approach making the sample you posted by making a mold and casting the Silver into it, that would get you the soft rolled edge detail.
-A
For the small Engraving on the quarter , I used what I had on hand, which was our 1/32 ball end bit.
3 inch per minute feed, 1 ipm plunge. 10k rpm.
The key to engraving hard materials with good results and not breaking the bit is to use a cutter that is as short as possible.
There are lots of inexpensive engraving bits out there, I would recommend using 60 degree bits which are shorter and stronger than the long 30 or 15 degree type.
Heres a great, but expensive engraving bit, its a 1/4 shank but tapers down to a .005" tip: