possibility to use a spindle (max 18K RPM) to drive a lathe (3000 rpm) for metals?

[santydofus2014]

Hey guys!

I have purchased a 3KW square ER20 air cooled spindle, with a maximum of 18.000 RPM, to use in my CNC router machine.

But i ended up using another spindle for the cnc router, this time water-cooled, and as time passed i can't return the ER20 3kW anymore.

I was wondering if i could use this spindle for a lathe, reducing the rpm and increasing the torque with Aluminum GT2 gears and a belt, to achieve a max of 3K rpm in the lathe chuck. But would this be possible? Isn't 18.000 RPM too much for these gears? How can I achieve this successfuly? or do i need another motor (servo, for example) for this application?

Thank you for your answers!

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[dazp1976]

I wouldn't bother trying.
Just get a servo and your power is guaranteed.

You'd need to gear down the 18k by a factor of 6 so you could end up with an undesirably large pulley on the chuck rear. Plus it's not guaranteed to be any good.