On 9/25/2010 12:19 PM, Ignoramus10035 wrote:
eBay is full of those:

http://shop.ebay.com/?_nkw=%22micro+drill%22+carbide

or similar tiny carbide end mills.

My question is how usable are they on a hobby sized CNC machine like
my Bridgeport Interact, with slow top speed. Is using them totally out
of question, or just frustrating, or perhaps they are handly for small
work?

You need to adjust your feed rate so as not to exceed
a reasonable chip load at lower RPMs but they work great
particularly on nasty stuff like fiberglass.
I milled out a couple double-sided PCBs using the tiny
end mills and the quality was far superior to any of
my previous attempts using other methods.

Try it, you'll like it.

--Winston

--
Corporate executive forgets to commit a felony for 24 hours.
Film at 11.