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If you need new mounts for that motor try Remco……

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As Bazyle says time was most folks didn't use a DoL starter box on hobby machines. Mostly due to the cost as they used to be expensive in real terms. As I remember things thirty or so years ago they were around £30 – £40 upwards.

However these days single phase DoL boxes can still be found for similar money, whilst boxed NVR switches seem to start at around £25. Naked NVR units can be found under £10 but by the time you've bought a box, cut a hole, drilled for cables, found some grommets and mounted it up …..

If you time it right on a certain auction site New Old Stock DoL boxes can be under £20. I'd not worry about having an overload unit if the price were right.

At that sort of price differential might as well go for the proper thing. Especially as some of the inexpensive NVR switch sets appear to be only single line switching. Found that out when I unbuttoned one that had become unreliable. Off a friends table saw so was just expecting it to be bunged up with dust.

Clive.

Edited By Clive Foster on 14/02/2019 19:40:54

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These items from Toolstation will start you off, the overload is available separately if you wish to fit one and should be selected to match the full load current of the motor. The starter will give you NVR protection (No Volt Release) which will stop the motor restarting by itself after a power failure. If required remote start and stop buttons can be wired to the starter which means you can have a small button box in a convenient position and loacate the starter out of the way. If reverse is required a changeover switch can be added. The single phase motor will need to stop before changing direction as it will carry on in the same direction if it has a centrifugal switch in the start winding.

Mike

Unless you're keen to save money or retain original parts for nostalgic reasons, how about replacing the motor and switchgear with a VFD and 3-phase motor? Unlike horrible bumpy single phase motors, the 3-phase type are smooth enough not to need resilient mounting. Motor vibration can spoil the finish. In addition to being smoother, more efficient, and with better torque, 3-phase motors are also more reliable – no start and run windings, capacitors and centrifugal switches to go wrong.

Single-phase motors are a sad compromise on most machine tools – their only advantage is they run on ordinary domestic electricity, making powering them easy. Everything else about them is inferior. When Myford 10s first appeared it was intimidatingly expensive to convert single phase to 3-phase in a home workshop. Very few could afford to do it. That's changed – the electronics needed to create 3-phase from single phase is now commonplace and affordable. What you get is a better motor with speed control, reverse, soft-start and emergency stop built-in.

Going 3-phase makes most sense when an old motor absolutely has to be replaced. But if you can afford it, going 3-phase would be a worthwhile improvement now.

Dave

A further VFD advantage which might be useful, is that some VFD kits come with an RPM gauge. It tells you the frequency of its output (motor rpm, sometimes), and doesn't account for any belt drive etc, but handy none-the-less.

Tim

Dave, I have just got a viceroy lathe running that I ‘acquired’. Changing to three phase is just plug wiring. There are just a few more wires! I didn’t think it was expensive for the vfd.

Dave