Gallery, Projects and General > How do I??

Variable speed for a mill/drill

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Gadabout:
Hi All, I have a rather oldish asian mill drill head and column grafted onto a Centec 2A automill setup up with 4 axis cnc. I find climbing a step ladder or using a stool to get up and change the belts for a speed change rather tedious and as I get older more painful, so I considered changing the belt setup to variable sheaves etc but now not sure if going to a vfd and a  new three phase motor might be the best option? I would like Mach 3 to be able to start and stop the motor and to control the speed, is this possible. I would like to keep the vfd/ motor conversion to about $500 and as I am in OZ can someone suggest what parts would be best to buy?
thanks

Mark

tumutbound:
VFD and a 3 phase motor sounds like the easiest way to go. Mach 3 can control the motor start/stop and speed.
What power is the current motor?

Gadabout:
Hi, Its 750 watt single phase 240 volts, only have single phase here at home, did find in my storage area a 3/4 horsepower three phase ( sorry to mix watts and horsepowers but wanted to read direct from the labels), would this be powerful enough( I think not in my mind) to use?

cheers
Mark

John Rudd:
Mark,
The general consensus is that a three ph motor is slightly more efficient than a single for the same hp...
That said, 3/4hp is 746*3/4 watts......
There is something else to consider....Is your motor a dual voltage motor?  I.e can it be configured for
Star and Delta?

Gadabout:
John,
 All the motor has are three connections marked "A", "B", "C". The plate says 400/440 volts.
 I diddly squat about three phase motors

cheers
Mark

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