[watahyahknow]

i have a HBM BF25 milling machine with its original motor and two speed gearbox with plastic gears
one of the things i like to do about its weak points is mount a bigger motor and a belt drive on it
3 phase motors are kindah heavy and have a large frame so i was looking intoo alternatives
the treadmill motor is one , but there kindah expensive when you add the cost of importing it from china or wherever ebay finds them used (usually the states ) there allso briushed motors

i have seen huge steppermotors been used as drivemotors and there small but there allso pretty expensive and i cant understand how to get them to work electricly (powersupply size , how to hook up the driver so it works as a stand alone unit , stuff like that ) the bigger ones run on weird dc voltages and usually dont come with the powersupply

another option i have been thinking about is using a chinese watercooled 2.2 Kw spindle motor
to fit it i need to make a new front plate with a flange so i can mount it on top of the machine , thats eazy enough
the thing that makes it harder is : i want to put a pulley and a keyway over the axle in place of the chuck , and the axles in the machine have tread tapped ontoo them and are hollow pretty far up intoo the axle
yes i could stick an axle in the chuck and mount the pulley to that but then the whole thing gets a bit high on top of the machine , it allso puts more un nessesairy force on the lower bearings
does anyone know if the axle from a chineese spindle motor can be pushed out of its rotor and replaced or is there a solid axle version available (allready mailed a few chinese supplyers but no luck so far )

i allso be interested to get my hands on a (cheap / free) used chinese spindle , doesnt need to be a working one , its mostly to see if i can fill the axle with weld and then remachine it back to round / straight and put a keyway in it without damaging it beyond repair

[mactec54]

i have a HBM BF25 milling machine with its original motor and two speed gearbox with plastic gears
one of the things i like to do about its weak points is mount a bigger motor and a belt drive on it
3 phase motors are kindah heavy and have a large frame so i was looking intoo alternatives
the treadmill motor is one , but there kindah expensive when you add the cost of importing it from china or wherever ebay finds them used (usually the states ) there allso briushed motors

i have seen huge steppermotors been used as drivemotors and there small but there allso pretty expensive and i cant understand how to get them to work electricly (powersupply size , how to hook up the driver so it works as a stand alone unit , stuff like that ) the bigger ones run on weird dc voltages and usually dont come with the powersupply

another option i have been thinking about is using a chinese watercooled 2.2 Kw spindle motor
to fit it i need to make a new front plate with a flange so i can mount it on top of the machine , thats eazy enough
the thing that makes it harder is : i want to put a pulley and a keyway over the axle in place of the chuck , and the axles in the machine have tread tapped ontoo them and are hollow pretty far up intoo the axle
yes i could stick an axle in the chuck and mount the pulley to that but then the whole thing gets a bit high on top of the machine , it allso puts more un nessesairy force on the lower bearings
does anyone know if the axle from a chineese spindle motor can be pushed out of its rotor and replaced or is there a solid axle version available (allready mailed a few chinese supplyers but no luck so far )

i allso be interested to get my hands on a (cheap / free) used chinese spindle , doesnt need to be a working one , its mostly to see if i can fill the axle with weld and then remachine it back to round / straight and put a keyway in it without damaging it beyond repair

The Chinese spindle would not be a good idea, there lowest speed they can run is 6,000 RPM and at that speed there is almost no torque, so not much good for a mill conversion, there are many others that do this already, and there are some kits also, they are here on the Zone

[awerby]

Lots of people get disgusted with the plastic gears in those mills, and replace them with a couple of opposing pulley clusters powered by a regular induction motor. You don't really need variable speed; a good high and low speed should be sufficient for most things. You should be able to find an adequate fixed-speed 220v motor without too much trouble. Those Chinese spindles, as has been pointed out, are much too fast. Here's a kit someone sells if you don't want to make the parts yourself: G0704 Belt Drive Kit - BenchtopPrecision.com

[dharmic]

Forget the treadmill. I've got a decent treadmill motor and controller on my bench which is going into a home build 2" x 72" belt grinder and they're even more gutless than the chinese 3hp spindles. Cheap if you happen to pick one up from the junk pile, but no way would I pay money for one for even light duties, let alone a mill spindle.