Change chuck on a seig c0?

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Change chuck on a seig c0?

This topic has 11 replies, 8 voices, and was last updated 1 August 2020 at 12:30 by Howard Lewis.

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31 July 2020 at 11:03 #10355
stewart legg
Participant
@stewartlegg79705
Bit of help needed….
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31 July 2020 at 11:03 #488446
stewart legg
Participant
@stewartlegg79705
Hi I picked up a seig c0 secondhand yesterday… How do I change the chuck on it? Lock the spindle? Thanks in advance 🙂
31 July 2020 at 11:31 #488457
Keith Long
Participant
@keithlong89920
Stewart I suggest that you follow this link to the manual which you can download.
31 July 2020 at 11:47 #488463
Howard Lewis
Participant
@howardlewis46836
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

HTH..
31 July 2020 at 13:51 #488491
not done it yet
Participant
@notdoneityet
That link is useless in this respect, unless the chuck is flange mounted. Says undo three nuts…
31 July 2020 at 14:05 #488496
Dave S
Participant
@daves59043
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

Dave
31 July 2020 at 14:16 #488497
Michael Gilligan
Participant
@michaelgilligan61133
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 !

MichaelG.
31 July 2020 at 14:35 #488510
JasonB
Moderator
@jasonb
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.
31 July 2020 at 14:36 #488511
Mick B1
Participant
@mickb1
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.
1 August 2020 at 09:59 #488616
stewart legg
Participant
@stewartlegg79705
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…
1 August 2020 at 10:07 #488621
Michael Gilligan
Participant
@michaelgilligan61133
Looks like the ‘three nuts’ must be those who produced the instruction book.

MichaelG.
1 August 2020 at 12:30 #488641
Howard Lewis
Participant
@howardlewis46836
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.

Howard
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