Mounting Chuck

[Suggy]

Hi All, When I got my lathe (second hand) it came with the 3 jaw chuck already mounted and up to now never needed to change it. The lathe came with a 4 jaw chuck and I'm a little nerves about changing it. The 3 jaw which is on the lathe as 3 bolts with nuts securing it in place





and there looks like there is some locating holes on the back plate


the 4 jaw chuck as 4 studs at the back



and no locating holes

Can anyone tell me how to mount both chuck's to the lathe? (I don’t mean both at the same time)

Cheers

Ian

[Chuck in E. TN]

First of all, we need to know what brand of lathe it is? From your description, I would guess a SEIG or Real Bull variant, but we need to be sure. Looks to me like you need an adaptor plate for the 4 jaw.
Chuck

[Suggy]

Just put the lathe type in my sig

Chester DB10GVS

[philf]

Hi Ian,

My guess is that the flange permanently fitted to the spindle has 6 or 7 holes (one hole may be common) and will take your 4-jaw directly. Those will be the extra holes you can see. (The 3-jaw and 4-jaw are supplied as standard with the lathe). Take the 3-jaw off and try it.

Cheers.

Phil.

[saw]

This is the very same type as I have, and the hole in the back plate fitts very well in 4-jaw chuck. The only thing you need is to be very care full when you are lossing the nuts, have a pice off tree to be shure. 

[Suggy]

Cheers chap, how hard is it to get them central again?

[philf]

Cheers chap, how hard is it to get them central again?

The register (recess) in the back of the chuck should be a snug fit on the flange which should have a corresponding spigot ensuring concentricity.

Phil.

[andyf]

Suggy, if the 3-jaw holds reasonably true, it might be an idea to mark it and the spindle flange so you can put it back again in the same position.

Andy

[saw]

Suggy, if the 3-jaw holds reasonably true, it might be an idea to mark it and the spindle flange so you can put it back again in the same position.

Yes that's the right things to do. 

[Rob.Wilson]

Hi Ian

What Phil and Andy said 

You may want to have a look here http://madmodder.net/index.php/topic,7643.25.html (scroll down a tad ) David came up with a good idea/mod  for the nuts that hold the chuck on .you will also notice David has marked his chuck and spindle 

Rob

[Deko]

Because the chuck is most likley to be tight on the register it will help if you fasten a length of bar in the chuck to help when removing it (a bit of extra leaverage and more to hold on to). It also helps when fitting the other chuck to hold it in place while you fit the nuts on.

Cheers Dek.

[ImIndoors]

And don't forget to cover the lathe bed under the chuck with a piece of protective wood while you are removing it.  Chucks can come away a bit sudden like and while they will bounce off the ways quite happily they can leave a nasty dink. 

Jim

[Suggy]

Thanks guys, looking to get in the garage tomorrow. 1st step is making a board for the bed 2nd useing the knurling tool if the bloody thing turns up and having a play with my new rotary table complete with dividing plates and tail stock