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Chat Area => General Discussion Area => Topic started by: Welung666 on 04 January 2012, 10:41:25

Title: Bench grinder wiring questions...
Post by: Welung666 on 04 January 2012, 10:41:25

I've just had my old wolf bench grinder motor rewound and I'm in the process of putting it back together but I can't find the bit of paper I wrote the wiring down on ::) The motor has 2 yellow and 2 blue wires, I have the switch and a black box mounted in the bottom with 2 connections. Can anyone give me a clue please?  ::)  ;D

Title: Re: Bench grinder wiring questions...
Post by: tigers_gonads on 04 January 2012, 10:50:31

Can you stick a picky up ?

Title: Re: Bench grinder wiring questions...
Post by: Welung666 on 04 January 2012, 10:58:15

Quote from: tigers_gonads on 04 January 2012, 10:50:31

Can you stick a picky up ?

I wish! I'm on a phone and have enough trouble replying  ;D The black box is a capacitor I think, I got a lovely pi$$er off it when I stripped it down on ;D

I think the 2 sets of wires out of the motor are a starting winding and a main winding, it's just how to connect them all I'm stuck on.

Title: Re: Bench grinder wiring questions...
Post by: Kevin Wood on 04 January 2012, 11:23:45

You will probably find it's an induction motor with two stator windings. You might find the yellow wires are one winding and the blue the other, or that each winding has a yellow at one end and a blue at the other - should be easy to find continuity to work that one out.

One winding will be straight across the mains (after the switch, of course).

A second winding will be fed with the capacitor in series with it to shift the phase of the supply.

If you get the two the wrong way round it'll just turn backwards so figure out the connections, try it one way and, if it turns backwards swap the two windings. If it just sits there and hums you might have one of the windings backwards or the capacitor is duff or not in series with one winding.

A photo would help figure it out if the above doesn't help.

Title: Re: Bench grinder wiring questions...
Post by: Welung666 on 04 January 2012, 11:32:36

Kevin, you are a star! All working again now. Thanks both for your help :y

Title: Re: Bench grinder wiring questions...
Post by: Tony H on 04 January 2012, 19:08:21

Quote from: Welung666 on 04 January 2012, 10:58:15

Quote from: tigers_gonads on 04 January 2012, 10:50:31

Can you stick a picky up ?

I wish! I'm on a phone and have enough trouble replying  ;D The black box is a capacitor I think, I got a lovely pi$$er off it when I stripped it down on ;D

I think the 2 sets of wires out of the motor are a starting winding and a main winding, it's just how to connect them all I'm stuck on.

Yep you get a "'ell of a belt off them!" :o

Title: Re: Bench grinder wiring questions...
Post by: Welung666 on 04 January 2012, 19:12:49

I was ok till my knuckle caught the casing! The socket was off but still plugged in so it had ground lol. There were a few choice words muttered I can tell you  ;D