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[Davek0974]

Hmm dont think my spindle can handle 4500rpm. Standard Chinese 2.2kw thingy.. Will try 6000rpm ;)

Thanks :D

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Ok, yes it will certainly not go that low - i have the same spindle and its useless below 8000, this is the issue with HSS - it needs low speeds or it burns up. Try and find a wood router bit - usually carbide tipped etc.

[Nickhofen]

Bits for woods are better for this job,I found bits for metal at a very good price on flee market some months agoade in Germany and make some tests on several scrap woods, the results are not as good as the one I have with wood bit.
If you can find a bit at a good price with bearing at the end,take it remove the bearing and trim the insert point flat with a Dremel or a similar tool....

[wallyblackburn]

Ok, yes it will certainly not go that low - i have the same spindle and its useless below 8000, this is the issue with HSS - it needs low speeds or it burns up. Try and find a wood router bit - usually carbide tipped etc.

How are folks using these spindles for Aluminum (or are they)? I would think that even with solid carbide 3-flute endmills, 8K would too fast.

Wallace

[Davek0974]

A 2mm single flute carbide tool in alu will be needing 30k+ rpm - these spindles are slow compared to some, even 5-6mm single flute will need 24k rpm.

Single flute work well as they are pretty strong and have a lot of chip-space in the flute.

When you get down to sub 1mm tools you need mega-rpm.

Don't forget these motors are sold as engraving spindles - the tools are sharp pointed and can take any rpm you have.

[wallyblackburn]

Yeah, I come from more of a machining background. I was thinking of 1/4", 3/8", and 1/2". But, I bet a good 1/4" coated 3-flute without too long a cutting helix could do 8K. Hopefully, I 'll get to see in next month or so. My 2.2KW spindle should be here in couple weeks.

Thanks,
Wallace

[JAZZCNC]

Yeah, I come from more of a machining background. I was thinking of 1/4", 3/8", and 1/2". But, I bet a good 1/4" coated 3-flute without too long a cutting helix could do 8K. Hopefully, I 'll get to see in next month or so. My 2.2KW spindle should be here in couple weeks.

Thanks,
Wallace

I cut Ali regularly with 8mm 3 flute Uncoated Carbide cutters at 12K-15K and 6mm 15-18K. Very rarely do I drop below 10K with any cutter when cutting ali.
The 2.2Kw WC spindles don't really have enough torque to cut ali at lower speeds.