# Speed and feeds questions

hi all i have the Ridged R22002 router i am cuttimg 3/4 Plywood with quarter in 2 flute upcut bit. was wondering what the best feed and speed should be if running 30 in per min what should the router be set at

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Disclaimer: I donât believe any of this, just didnât want the post unanswered for more then 1 hour.
I hope this rubbish will trigger some response

The calculators you find in the grid are all for âGranny - CNCsâ.
On almost every site you will find different â views/feelings/opinions/formula/âfactsâ and experiences.

One formula i found (i just hope i could dig out enough math from ~40 years ago) is this one, that shows (if any of this is true), that with routers we canât go down to the RPM that this formulas calculate. (spindles can, but i will find out if there is a big surprise when i try it)

Feed = N x cpt x RPM
RPM = Feed / (N x cpt)

Typical Chip Load (cpt) Values for Tool Diameter 6mm in Softwood / Plywood is 0.28 - 0.33
Feed rate is maxed by GC at 800mm/min ~ 31.4961 "/min
N = number of flutes

In your case Feed 800 / (2 flutes x 0.3 cpt) = 1333.33 RPM

The Maslow does somehow not fit within the range of existing knowledge in the grid.

Ignore all the nonsense above, the Maslow seems to have itâs own rules.
Sacrifice 1 bit with a series of test cut on scrap (same material as you want to cut after) with a series of tests.
Your ears can be a calibration tool for the RPM. If the bit screams, you are to low on PRM and/or to deep in the material.
If the cut leaves burn-marks you are to high on RPM and/or donât go deep enough with each round.
Keep an eye on the size of the chips, as they transport the heat away from your bit. If itâs dust, RPM to high. If they are to big, you might hear the bit screaming.
Also keep an eye on the finish of your cut. You donât want to sand to much
Check if there is a difference it you pull straight up of straight down and find the âmiddle bestâ.

Kind regards, Gero

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ya i have been doing the hearing test just thought some of the maslow users could throw in what they are using thats why i put what router i am using. but you are correct the typical math does not work on the maslow

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Statistical data is missing throughout the development, but is also difficult because of the different builds.
Maybe it should be âmust fieldsâ to fill out before you can upload a project, or better then âmustâ, voluntary information by the makers.

Go to CNCcookbook - they have S & F as a service. Basically if I understand the modle correctly itâs a 1 time fee based on HP.

May the force be with you.

Thank you

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Personally, Iâve had no luck finding a good speed for a 1/4" 2 flute bit with the current Maslow setup. According to my math, which uses the same formulas as @Gero had posted above, the ideal feedrate for that bit in the Rigid router is 3,048 mm/min.

Iâve found much more success with different tooling. I use 1/4" single flute tooling regularly for most of my operations, and they hold up pretty well. Something like this tool would work well. For that, I run it at the lowest RPM, 10,000, at about 600 mm/min.

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