# Machi 500W spindle

Hi Guys,

I have been using a Ryobi router with no speed control and started noticing that I am burning my bits every 2-3 hours of cutting.

I bough a new spindle 500w. Any suggestions on the speed that I should use? RpM wise maby.

Regards
Wernicht

@Gero sorry but your my go to guy at the moment for speedy answers. Any suggestions or people you might know

I think there is some math you can do to calculate a reasonable rate (based on some light reading on page 7). Take the following assumptions:

Fundamental equation-

Chip Load = Feed Rate / (RPM * # flutes)

pg 13 has info for pine plywood (soft) so instead of doing the math, just look at the table. Most of them show 18000 rpm as a reasonable speed so you could start there or you could go through the math just using the chip load numbers they give such as 0.004-0.006 for the plywood.

assume 1/4" 2 flute upcut:

RPM = (500mmpm/[25.4 (in/mm)]/(2 flutes * 0.005 chip load) = 1968 rpm
boosing the feed to 700 mmpm = 2755 rpm

I am unsure if that chip load they provided is relevant for our system, but it looks like you can run super slow on the spindle and be ok. Please check the math and read the paper for verification, but too slow doesnâ€™t appear to be the issue here.

Hi @Orob!

I have been off the forum for awhile, but have had pretty good success with my Maslow set-up (after A LOT of small and large upgrades, adjustments and calibrations). Re: cutting rpm, bit size, material, cutting depth, and feed rate play into this. I like the math approach suggested by @orob, but I donâ€™t think our routers go that slow (Iâ€™m away from my shop right now, so I cannot check my Rigid). Early on I thought that faster was better, and ran pretty much full bore, 18-20K rpm. And burned a lot of bits. So, one day I decided to see just how slow I could go and still get decent cuts. I use 1/4" for general cutting, and 1/8" bits when the cuts are complex, mostly 2 flute up-cutting, and cut mostly 1/4", 1/2" and 3/4" ply. Feed rate out of the box is pretty slow (and I do not recommend trying to go faster, as the use of chains and gravity are not friendly to speed). My cutting depths usually are around .15" on 1/4" ply (2 passes), .18 on 1/2" ply (3 passes), and .26 on 3/4" ply (all with a 1/4" foam insulation waste board underneath the workpiece). I think I settled on the following: 1/8" @ 11,000 rpm, and the 1/4" @ 13,000. At these speeds the bits do not â€śblackenâ€ť.

Patience and Persaverance rule in this Maslow world, so doing test runs is what it is all about.

Hope this helps! Bob.

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Another thing Iâ€™d recommend is to get some spray on engine cleaner / degreaser and use that every 1 to 2 hours on your bits and wipe off the residue buildup. It really helps prolong the life of your bits, try it on some of your blackened bits and see how they perform.

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