wanted spindle speed increaser for cnc milling machine

A friend of mine needs to do some engraving usung his cnc mill. He is looking for something that will offer a 2or3-1 higher speed. His mill can accomodate a bt35, bt40 or int40 toolholders. I seem to remember that someone on here bought or made such a device. Any help in tracking something down would be much appreciated. Thanks, G.

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Originally Posted by GEOFFREY

A friend of mine needs to do some engraving usung his cnc mill. He is looking for something that will offer a 2or3-1 higher speed. His mill can accomodate a bt35, bt40 or int40 toolholders. I seem to remember that someone on here bought or made such a device. Any help in tracking something down would be much appreciated. Thanks, G.

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Something like this;- http://www.mycncuk.com/threads/7735-...peed+increaser

Thanks Clive, I thought that I had seen something like that on here. I have passed the details on to my friend, but if anyone has a speed increaser for sale ready built, please contact me. Regards. G.

IIRC when this first came out I had a look and it reversed the spindle direction. Great if your mill has a reversing switch on the motor but that's far from common!