[DrStein99]

I just built my own cnc machine using mostly aluminum; and a 30k rpm dremel for the "router" w/ 1/8" collet. Got little experience machining, this is a good learning project for me. I could use some advice, please -

Can someone reccomend a bit / mill type for milling 1/4" aluminum? I'm trying to use the machine to make parts for a different machine.

[Pres]

Assuming you want to cut all the way thru a 1/4" plate.
Consider using a single flute carbide cutter and don't go
any deeper than .050" per pass.
(start w/0.025" deep & work up if all seems ok)

5-10 passes and you are thru it with a decent finish.

Pres

[DrStein99]

I have a two flute 3/32 bit, four flute 3/32 bit and a two flute 1/16 bit. Would you say the best for that job is a single flute?

[Pres]

I have a two flute 3/32 bit, four flute 3/32 bit and a two flute 1/16 bit. Would you say the best for that job is a single flute?

Yes, use a 1/8" shank/collet/bit (more strength), since a
Dremel is not a very strong tool holder.
Its more like grinding off the mat'l than cutting it.
(Make sure you have some air blowing on the tool to help
clear the cutter, particularly when slotting)

You can try smaller sizes, & more flutes, but if cutter breakage is a problem you need the strongest setup a Dremel can handle.

Good luck,
Pres

[DrStein99]

I'm using a flex-shaft for the dremel. This alleiviates weight from the z-axis, and also wear and tear on the spindle assembly inside the dremel motor. Currently, I have a plastic dremel hand-piece, but am upgrading to the aluminum handpiece from dremel which seems stronger, and also the key for the collet is lower down the handle.

I'm very open to suggestions that are reasonable for my limited budget; without having access to a lathe. I realize there are monster solutions that are unaffordable to me right now; as I use my skills over my income to get jobs done.