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3 Phase Electrics

Posted: Thu Dec 16, 2010 3:50 pm
by Adrian Harris
I've just bought myself a Meddings Drilltru Pillar Drill, to replace the awful Clarke one I bought when I first started out with my Sherman.

http://www.dbkeighley.co.uk/masters/med ... riltru.htm

The electrics have been completely sabotaged, so I need to rewire it and get an inverter, so that I can run it from the 240V single phase supply.

Has anyone been involved in these inverters and their use in a home workshop ?

Adrian.

Posted: Thu Dec 16, 2010 5:09 pm
by leesellars
Hello Adrian

What do mean by sabotarged? Photos please. It might be better to get a 1 phase motor ie 240 VAC

Lee

Posted: Thu Dec 16, 2010 5:30 pm
by Adrian Harris
> What do mean by sabotarged?

The incoming mains lead had been cut off at the drill casing. When I removed the switch, it turned out to be standard three core mains cable, not the proper 3 phase cable. The cable from the switch to the motor seems OK, if a little old, but the glands are all broken as well.

I've found quite a few places which sell inverters for this 1/3HP motor.
Currently looking at the Vacon 10. Looks to be simple, fairly cheap and easy to wall mount.

Adrian.

Posted: Sat Dec 18, 2010 6:26 pm
by Richie Wignall
Hi Adrian

It may be cheaper to buy a new motor , if your going for an 3phase inverter, get one that will run more than one machine , just in case you find a very cheap bargain. :P
p.s the cable is normally cut to stop people using it if unsafe or just for badness :evil:

Richie :wink:

Posted: Sun Dec 19, 2010 11:14 am
by Dennis Jones
Hi Adrian,

I agree with Richie about fitting a new motor because you may go to the expense of buying an inverter and then find the motor is faulty and I am sure that a new motor would price wise be on a par with an inverter. We fitted a new motor to a mate of mine mill he bought as that was 3 pahse. That's my three penneth anyway.

Dennis.

Posted: Sat Jan 01, 2011 11:31 am
by Adrian Harris
Flying in the face of all the advice :oops: I've ordered an invertor. The motor rotates freely and the windings seem to check out OK, so I'm hoping the advice I've found about 3 phase drills being smoother and more powerful than similar rated single phase ones turns out to be correct.

This is the beast, next to my cr*p Clarke drill.

Image

I can honestly say to anyone starting this hobby that these little Clarke/Sealey/Draper drills really aren't worth the money. This one has around 3mm of slop when fully extended and there is no way to compensate or adjust it :evil:

The column on the Meddings drill is 4" solid steel bar, which must be worth more in scrap than the £65 I paid for the whole drill :shock:

Adrian.

Posted: Sun Jan 23, 2011 9:19 am
by Adrian Harris
Having had to chase the VFD supplier, and being told that my order was coincidentally due to be delivered the next day :evil: , I've finally got the drill wired up and running yesterday.

Apart from the belt, which is damaged and needs replacing, the drill seems to run as sweet as a very sweet thing, and is amazingly quiet, even when on full speed and in the highest gear. Just a slight whine from the motor due to the voltage chopped 3 phase power.

So, just a £4 V-belt and £5 Jacobs chuck key to get and I'm back in business :D

Adrian.