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Pete.02/10/2021 17:10:51
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910 forum posts
303 photos

Every now and then I see something, and just don't have words to describe.

The bolts coming out the chuck look like a medieval torture device.

I don't mean to be unkind, but this just looks flat out dangerous.

**LINK**

Michael Gilligan02/10/2021 17:33:24
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23121 forum posts
1360 photos

At the current bid of £10 someone would probably get a bargain

... as long as they render it down to a collection of components !!

MichaelG.

jimmy b02/10/2021 17:50:38
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857 forum posts
45 photos

Words fail me!

Jim

Ady102/10/2021 18:06:52
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6137 forum posts
893 photos

Looks fine to me

Andrew Johnston02/10/2021 18:16:03
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7061 forum posts
719 photos

It's a box chuck, albeit larger than normal. Box chucks are standard accessories for clockmakers and instrument lathes.

Andrew

JasonB02/10/2021 18:34:45
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25215 forum posts
3105 photos
1 articles

I should think it would be OK to free hob a few gear ondevil

Ian Parkin02/10/2021 18:34:56
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1174 forum posts
303 photos

Interesting use of a variable speed on a single phase induction motor too.

Rob McSweeney02/10/2021 18:42:21
98 forum posts
Posted by Michael Gilligan on 02/10/2021 17:33:24:

At the current bid of £10 someone would probably get a bargain

... as long as they render it down to a collection of components !!

MichaelG.

Seller has set a reserve "to cover the cost of components" which suggests that - a. buying it as a source of parts won't be an economic proposition, and b. he won't find a buyer.

Dave Halford02/10/2021 18:52:55
2536 forum posts
24 photos
Posted by Ian Parkin on 02/10/2021 18:34:56:

Interesting use of a variable speed on a single phase induction motor too.

There's probably a trigger off a mains drill somewhere

Ady102/10/2021 19:19:10
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6137 forum posts
893 photos

I like the spindle flywheel counterweight

larry phelan 103/10/2021 09:17:19
1346 forum posts
15 photos

At least it,s Made in England. Can,t be that bad.

Tony Pratt 103/10/2021 09:21:18
2319 forum posts
13 photos

Vibration free at 2950 rpm, currently 2 bids maybe sailors looking for a boat anchor?wink 2

Tony

Baz03/10/2021 09:30:13
1033 forum posts
2 photos

Only thing that puts me off is collection from Kilmarnock, can’t get any fuel to get there!

Peter Cook 603/10/2021 12:18:33
462 forum posts
113 photos
Posted by Ian Parkin on 02/10/2021 18:34:56:

Interesting use of a variable speed on a single phase induction motor too.

Not sure that's an induction motor as its rated at 2950 rpm. More likely to be a universal brushed motor and the speed controller is probably one of these

Edited By JasonB on 03/10/2021 13:07:25

John Haine03/10/2021 12:26:53
5563 forum posts
322 photos

They don't use universal motors on grinders because of the risk of overspeed and I can imagine a cheap grinder using an induction motor quoting its speed as 2950, synchronous speed being 3000 on 50hz.

noel shelley03/10/2021 12:42:41
2308 forum posts
33 photos

John, Syncronous speed 3000rpm 50hz, slip and losses =2850rpm(or so) for a 2pole motor.on load.Noel.

Peter Cook 603/10/2021 13:04:56
462 forum posts
113 photos

John, Noel - the motor is clearly marked 60Hz 240V, and if you look at the closeup of the speed controller, inside the red box it looks like the one I linked to.

But I must confess I haven't tried my controller ( used for an old electric drill) on an induction motor. I wouldn't expect it to work.

Michael Gilligan03/10/2021 13:28:52
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23121 forum posts
1360 photos
Posted by Peter Cook 6 on 03/10/2021 13:04:56:

John, Noel - the motor is clearly marked 60Hz 240V, and if you look at the closeup of the speed controller, inside the red box it looks like the one I linked to.

.

Presumably the link that Jason removed [see Code of Conduct]

MichaelG.

John Haine03/10/2021 13:45:39
5563 forum posts
322 photos

Ah, only looked at the photos on my phone, didn't see the motor plate. But a 240V 60Hz motor in the UK? Where did that come from? I just assumed that the 2950rpm was a bit of typical specmanship. I can imagine that the horrible induction motors used in cheap grinders would "speed control" down to 0 rpm run off one of those controllers, and up to max, just not very linear!!

Edited By John Haine on 03/10/2021 13:47:49

Dalboy03/10/2021 14:13:36
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1009 forum posts
305 photos

We had a Black museum when I was at work of some of the things people did to power tool this should have been in that

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