What kind of engraving bits?

[mgjones]

I am just starting out with a CNC mini mill (Sherline 5000 series inside an enclosure). The mill conversion is complete, the software is running and I've been playing with some GCode programs. Translation: I'm completely new at this stuff and need some help.

I would like to do some photo engraving as well as fine lettering. I've been looking at engraving bits and have seen two basic types. One is a one-piece bit that goes from a shank down to a flat, v-shaped sharp tip. The other, is a type of "holder" that holds a v-shaped, sharp tip.

What's "recommended"?

For the photos, should I use a v shaped bit, or a small diameter endmill?

What size is most useful/versatile?

Any recommendations would be appreciated.

[dertsap]

these are the v-bits i use and sell http://cnctoybox.com/shop/category_6...aram=cid%3D%26 , with the deeper depths that i do i prefer the 1/4" dia , personaly i like the 20 deg bits because i don't loose too much detail

this is the type of stuff that i do with them in my spare time
"http://www.youtube.com/watch?v=gMv69uii-aM&feature=related"]YouTube - cutting hd part 2

[tobyaxis]

Like dertsap said, it depends on what kind of detail you need.

I use these when detail isn't that important.

http://www.harveytool.com/products/p...raving+Cutters

[Superman]

Your choice of tooling is dependant on the actual detail being machined, volume of material to be removed, actual material

.. a one-piece bit that goes from a shank down to a flat, v-shaped sharp tip.

Is a "D" bit, vee is one profile of many available

If a large open area then a "D"bit ( with the point removed )
for fine detail obviously a pointed tool. Some software ride up in the corners using the tool's taper to finish the shape ( CasMate was the software used )

Tool angles should also be looked at, as any thin detail will not be able to support itself, so draft would be used.

see
http://www.pilotltd.net/engraving.htm
and
http://www.antaresinc.net/

PS in metal, it is a nightmare changing and resetting blunt tools
Happy Engraving