[Aero98]

Does anyone know of a good formula for calculating torque requirements for a reamer.

I have a 16 flute 2.5625 straight flute reamer going into a 2.555 hole and the material is 1018. It's a weird assembly and we are building a machine to ream these holes that start 36" down a tube.

thanks,
Matt Henley

[ataxy]

torque or do you mean rpm? if its rpm then use around half the speed you would use for drilling the same hole

[Aero98]

torque or do you mean rpm? if its rpm then use around half the speed you would use for drilling the same hole

no, I dont know how much torque a motor will need.

[neilw20]

Can you ream a similar part on an existing machine.
If so, measure the supply current before you start cutting, do some cuttng and measure the current.
Subtract idle current from tha largest reading you got.
Multiply that by supply votage, and divide by 746.

That's roughly the horsepower you used, plus whatever losses crept in.
You need at least that much.

If the supply is single phase it is easy. If multiphase, then it gets more complicated than above.