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Post by Deleted on Dec 17, 2013 16:25:11 GMT
Just a thought}---- Dual-speed, compound wound ?
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jackrae
Elder Statesman
Posts: 1,333
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Post by jackrae on Dec 17, 2013 16:34:24 GMT
Relay is clearly a current sense relay
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Post by Deleted on Dec 17, 2013 16:37:33 GMT
Relay is clearly a current sense relay ----------------------------------------- thus related to loading maybe ??
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greensands
Part of the e-furniture
Building a Don Young 5" Black Five
Posts: 409
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Post by greensands on Dec 17, 2013 17:26:49 GMT
Additional information: Motor rated at 1/20 HP
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Post by Roger on Dec 17, 2013 18:45:59 GMT
I'll put my hand up and confess that I'm not familiar with this kind of motor/starter arrangement but do find it interesting. I think I might just have found what you need to know.... www.brighthubengineering.com/diy-electronics-devices/45180-self-starting-induction-motors/Take a look at the diagram which is the fifth picture down, its shows how one setup is connected and it sounds like yours to me. It looks like the relay closes the contact to the starting winding while the current is high during startup, and then lets it drop out when the current falls on reaching speed. Simple and clever. You learn something every day, and not a capacitor in sight!
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Post by andyhigham on Dec 17, 2013 19:35:42 GMT
1/20 HP, thats about 38W. It won't make a very good toolpost drill. For comparison a dremmel is 135W, a 6" bathroom fan is 25W-40W
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steam4ian
Elder Statesman
One good turn deserves another
Posts: 2,069
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Post by steam4ian on Dec 17, 2013 19:48:12 GMT
Roger has hit the nail on the head with that link, well found.
To know which winding is which you should do two things. Firstly measure the resistance, you may have difficulty because the values will be relatively low. Secondly, pull the motor apart, you need to to put in new leads anyway. When you see the windings you will notice that one appears to be at the back of the slots and has thinner wire, this is the starting winding.
1/20 HP is hardly enough for a drill unless you are using numbers finer than 60. This little motor will be challenged in the torque department hence my comments about using a discarded battery drill. I did by making up a spindle that bolted to the tool post and then drove it by the motor & gear box out os a discarded drill. The coupling is a piece of hose and jubilee clamps. Has speed control too. Ian
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Post by goldstar31 on Dec 18, 2013 11:08:00 GMT
From my small corner, I wouldn't be bothered with a motor than would neither make a tool post grinder or a little drill.
There used to be two things. There was such a thing as a 43 mm collar which could be fastened to a lathe saddle which would hold a router as a tool post grinder. Mine was a Bosch POF 45. And the average common or garden electric drill has a similar collar. When push came to shove, and so on, you could use the collar thing as a fixed steady and whatever as it was dead in line with the lathe spindle.
And a Merry Doo Dah to you in your small corners.
Norm
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Post by Roger on Dec 18, 2013 12:45:32 GMT
I don't really know what the purpose of this drill is, but in the past I've made attachments that are held in a quick change toolpost so that the centre height can be easily adjusted.
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greensands
Part of the e-furniture
Building a Don Young 5" Black Five
Posts: 409
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Post by greensands on Dec 18, 2013 20:46:56 GMT
Hi All - Thanks to everyone who has contributed to this thread. After giving the matter some serious thought I have decided against using the motor for the intended application as given the state of the internal wiring I don't think it would be worth the risks. However, I have learnt quite a bit in the process and will now keep my eyes open for a more suitable replacement.
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Post by Kevin on Dec 19, 2013 8:57:18 GMT
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