Most likely these are "burrs" or rotary files. If you keep the
feeds down you can make your own engraving style cutters out of
drill or carbide rod. Goodle for 1/2 round 1/4 round and facated
engraving tools. Won't be as good as the "store bought" ones but
will work. You might want to get a few "store bought" ones for
models.

Looking at the picture, it looks like these might be pretty good
to modify to 1/41/2 round style cutters by grinding back past the
"file"

Uncle George

On 17 Jan 2006 10:12:44 -0800, "jw" wrote:

Has anyone here used these:

http://www.harborfreight.com/cpi/cta...emnumber=34640

They appear to be endmills or at least some sort of sidecutting bit.
Is this true?

I would call HF, but I don't expect whomever answers the phone to know
much more than what is already listed on the website/catalog.

Background info: I have a small CNC mill (Roland CAMM3), that I have
FINALLY gotten around to proving actually works. Now that I have done
so, I would like to make some stuff with it. It is a benchtop
modeller, and is designed for small bits. I could buy the bits from
Roland but they want a lot of money. I don't expect that these are
going to be "top-end", but if they get the job done they would be cheap
enough to break a few.

I would like to do some cut PCBs and also cutting some shapes in
plastic sheet(see recent thread in relation to that).

Thanks everyone

JW