A gear reduction is probably going to be your only way. That motor will be a 2 pole. For half that speed you would need the 4 pole version. To use a VFD may give you reduced torque of which the hacksaw needs plenty. You could do it with pulleys rather than a gearbox.

Steve.

You could look up TEC gearboxes. No idea how good, bad or ugly they might be but they do offer all sorts of ratios and in different formats – spur, helical, worm-wheel – In a wide range of power rating. Reasonable price ranges, too, from light duty (as in cheap) to heavier duty specification.

Edited to add that they do motors, too.  Personally I would buy a 3 phase 1425rpm pair and add a VFD to the system – so much better operation than single phase – soft start, variable speed, remote low voltage control and safety circuits all make them worthwhile considering.

Edited By not done it yet on 27/06/2020 15:16:46

Tony

My Rapidor Manchester power hacksaw uses a standard ac motor which runs at about half the speed of your motor. It uses a two stage speed reduction using v belts with an overall step down of about 30:1. It works well, is quiet, and has massive torque. Only snag from your point of view is that the large pulleys are, well, quite large! Take a look at the Rapidor pictures in the machine tool archive on the lathes.co.uk website And you will get the idea. If space is not a problem it might be the way to go.

Mike

You are not really at the best starting point.

The most compact way of getting a 30:1 reduction would be a worm and wheel. But this would mean your motor sticking out at right angles to the machine. (Unless you fancy having two worm boxes, say 6:1 feeding a 5:1 to bring the drive lines back parallel again )

For 30:1 with belts you would need at least a two stage drive, again a 6:1 and then a 5:1. With a minimum pulley diameter of 1.5 inches,the driven pulleys are still going to be pretty large,, 7.5" and 9 " diameter.

Assuming that you are using a standard 12" hacksaw blade, a Z section belt would probably cope with such small pulleys.

Polyvee belts might be better, for small diameter driving pulleys..

With small driving pulleys, to increase the wrap around the pulley, you will need fairly long pulley centres.

A four pole motor with a nominal 1475 rpm would halve the ratios needed, allowing driving pulleys of 2" minimum, and smaller driven pulleys..

If the motor can be mounted under the machine, it could drive to the countershaft at the rear, to make things compact.

Howard