Thread: Wanted jaws for Burnerd 4" 3 jaw chuck.

If you intend only using the 3 Jaw chuck for general maching and are not chasing repeatability (removing job and replacing ) I wouldnt be to worried about the quality,the cheaper chucks will perform almost as well as a top of the line chuck,but at a fraction of the cost.

If by some chance you are going to be machining any thing that has mill scale on it you will almost certainly throw the chuck out,another resaon to not chase quality.

If you were chasing repeatability you would be advised to look at Set true 3 jaw chucks,4 jaw chuck and a Collet chuck.

yeah most of that doesn't apply to me at the moment, I think I will end up fitting the 160mm seeing that I already have it. It is a much more useable size anyway.

If I were to get some 3/4" or 1" thick mild steel plate and cut it slightly larger than 160mm using the oxy with circle cutter, would I be able to cut the register and the thread to suit using my lathe with the faceplate?

Cant see it being a problem although Cast Iron would be the pick over Steel.

The Blank would have to be a bit thicker than the overall length of the Threaded Spindle.

You would also have to pack the Blank out from the Face plate to allow for the Threading tool.

You would be able to clamp on the outside of the Blank in 3 or 4 places.

There at this stage no need to face the entire face of the Blank.

You would only need to have a sufficent area faced to allow for a face to register on the Spindle register.

After cutting the thread and the register for the Spindle you would remove the Blank from the Face plate and mount the Blank in the reverse position to allow the Faceing of the remainder of the Spindle mounting Face.

You would then place the Blank back on the Spindle in the correct position and turn the OD and the machine for the Chuck register.

cheers for that, sounds simple enough in theory. Where would the best place to purchase a cast iron blank?

Also just had another thought, if I had purchased a chuck with a backing plate that was on another lathe with the same 1 1/2" tpi as mine, would it be correct to assume it would run accurate?

Most Metal merchants should be able to supply a Blank. Probably around $20/$25 for a bit of 4E 160mm X 25/30mm.
If the Chuck and Backing plate was off the same Type of Lathe it would be very possable that it would be fine.

Thanks, I will probably head down that way. Now that I have the spindle out, I am now thinking of giving this lathe a bit of a restoration, so I have a bit more time up my sleeves before I need a chuck. argh