Hi again!
I recently received a ridiculous quantity of some suspiciously
inexpensive 0.9mm diamond burrs I won on eBay.
http://tinyurl.com/cncw6I don't have any serious board drilling on the agenda, but I tried a
bunch of test holes and it doesn't look too promising-
On the first couple holes the bit feels as if it's "burning" it's way
through the PCB with some unfamiliar looking debris being tossed out
of the cut. I actually had to remove and examine the bit with a
magnifying glass to see if it had anything that looked like cutters. I
tried another with the same result. They had to feed extremely slow
due to the "not so clean" cut and I actually broke two tips by not
giving them the time to "burn" through. They also leave a nasty raised
lip around the entry and exit holes, which would imply that they're
pushing rather than cutting their way through.
I had used a Dremel diamond burr for a long time, but eventually
dulled it on something or chipped it's cutters. I got another one not
long ago and did something stupid in a hurry (side to side pressure),
which broke the ball off. IIRC- They cut quite nicely, however, they
were around 2.5mm, which wasn't too good for smaller stuff, plus I
think they were 5 or 6 bucks a pop.
Does anyone else here use dental burrs for their drill work. If so,
how quick and clean of a cut are you usually getting?
That seller had about 650 profile hits, all positive, and states that
the bits are all top quality, just with no names. Some of the feedback
even praised the quality of them. (??)
Regardless of what ends up happening with these, I was sort of in a
pinch. I don't like the idea of buying one or two non-standard micro
small bits locally and the 5 pack of mini Dremel drill bits (in a
glass tube) is no longer around here.
How are the rest of you guys stocking up, and from where?
-Thanks Again!
George