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Change chuck on a seig c0?

Bit of help needed....

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stewart legg31/07/2020 11:03:35
7 forum posts

Hi I picked up a seig c0 secondhand yesterday... How do I change the chuck on it? Lock the spindle? Thanks in advance 🙂

Keith Long31/07/2020 11:31:50
870 forum posts
11 photos

Stewart I suggest that you follow this link to the manual which you can download.

Howard Lewis31/07/2020 11:47:18
5733 forum posts
13 photos

One way of unscrewing the chuck would be to clamp a piece of hexagon bar in the chuck, and apply a socket and bar to the hexagon. A sharp blow at the end of the bar may well slacken the chuck.

A slightly more brutal method would be to clamp a piece of wood across the chuck jaws, and hit the end of that, to slacken the chuck.

In both cases, the inertia of the spindle and motor should provide enough resistance to allow the chuck to slacken.

The standard advice given for any lathe where the chuck screws on is never to run the chuck on under power.

Having been run on by hand, it will tighten in use.

Control boards seem to last longer if the lathe is always started with the speed control set to Zero


not done it yet31/07/2020 13:51:07
6504 forum posts
20 photos

That link is useless in this respect, unless the chuck is flange mounted. Says undo three nuts...

Dave S31/07/2020 14:05:50
300 forum posts
61 photos

On my Unimat 4 (essentially the same) I open the belt guard and hold the pulley whilst unscrewing it.

There is a cross hole in the back of the spindle you can use to stop the spindle rotating of a gorilla has screwed on your chuck. In that case an adjustable spanner on a chuck jaw and a pin punch through the hole would do the job


Michael Gilligan31/07/2020 14:16:27
19571 forum posts
994 photos
Posted by not done it yet on 31/07/2020 13:51:07:

That link is useless in this respect, unless the chuck is flange mounted. Says undo three nuts...


If, however, the chuck is flange mounted ... it could save a lot of distress !


JasonB31/07/2020 14:35:58
21963 forum posts
2531 photos
1 articles

Text may say loosen 3 nuts but parts pic shows a threaded spindle as does ARC , their backplates are also threaded. You can also see the cross hole that takes a tommy par, put another bar in one of the three holes in the chuck body and lever them apart.

Mick B131/07/2020 14:36:58
2082 forum posts
121 photos

What I did on mine was to turn two 4mm dia spigots on the ends of 10mm and 3/8" silver steel sticks I happened to have.

That was because the chuck had been fitted by Ghengis Khan on a cross day, and trying to use the tommy bars provided made me wonder if it was welded on or summat.

With longer bars like I'd made, and using the cross hole where the tail end of the spindle exits the headstock, it came off by unscrewing normally - from memory it's an M14 x 1 thread, normal RH.

stewart legg01/08/2020 09:59:50
7 forum posts

I'm all sorted now.. Opened the door at the end and the spindle has a hole through it... Put a small screwdriver through the hole and voila... All done...

Michael Gilligan01/08/2020 10:07:03
19571 forum posts
994 photos

Looks like the ‘three nuts’ must be those who produced the instruction book.


Howard Lewis01/08/2020 12:30:50
5733 forum posts
13 photos

Instruction books are sometimes written in a strange language, often unknown to the poor reader!

The main thing is that OP is now sorted and ready to start his journey with the machine.


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