Burnerd Chuck Jaws

Well, two more of thr teeth on my chuck’s jaws finally gave,

It is for a myford ml10 burnerd chuck.Is there anyone here who has an extra set of these, or knows where to find them? It is a self centering jaw, three teeth.

Try rotagriponline.com. look in their index tab for Pratt Burnerd jaws and try to match up what you want with what you've got. If push comes to shove, you might be able to post one of yours to them to be sure the ones you choose are the same as those they pull off the shelf.

Rotagrip will probably be able to supply, but the cost of replacement PB jaws is eye-watering. A new, far-eastern chuck would make better economic sense IMO

You will have to measure the chuck diameter and all of the jaw dimentions especially the tooth pitch. Look carefully on ebay for a match. It may be easier to chuck the chuck and replace it with a new one from somewhere like ARC.

Get some soft jaws for that one and buy a new chuck.

regards Martin

I'm guessing they broke when the chuck was holding stuff at near maximum diameter ?

These may be a bit large for a ML10, but I have 5 sets of new Internal jaws for a 160 mm P - B 3 jaw chuck..

The part number is 2210-17603

If they are any use to you, we can come to some arrangement to get them to you.

Howard

There was a tooth broken on the chuck a while back, and then another one broke...you get the idea. I will post some pics tonight of which chuck it is.
 

I’d like to see if i could find some teeth for this chuck, instead of purchasing a cheap knock off chuck, but will see I guess. 

Edited By Jeremy Smith 2 on 24/05/2021 19:28:08

Check that the jaws are a good fit in their slots, the slots in the body might have been strained, and a close look at the scroll is a good idea. There is a chance that your lathe could take a slightly bigger chuck, I'm sure somebody could advise the maximum usable size.

Anyone here have an extra set of teeth, laying around, for this chuck?

What does everyone here recommend as a replacement chuck? Should I get one size larger for my ml10?

I have a monster 6” chuck, but when the teeth are extended, it doesn’t clear the bed. Trying to find a happy medium on size.

If its any help i can recommend the chucks sold by ARC, I bought a 4 Jaw s/c 125mm chuck and couldn't believe the accuracy over a range of diameters, I was so impressed I bought a 125mm 3 jaw initially for rougher work to save my nos P-B 3 jaw, but again the accuracy is most impressive. Only had them a couple of weeks so can't say its a long term test, not quite as smooth in operation as the P-B but seems well made and an absolute bargain at £50 for the 3 jaw. It cost more for the D1 backplate than the chuck!

Dave

I second that. ARC's Chinese chuks are as good as an ordinary PB chuck. They stand up to a lot of work, without any distress.

Andrew.

Bison is another brand of very good chucks. If you replace the chuck you might consider one with two piece jaws. That allows the use of soft jaws that you can bore to fit your work ensuring concentricity.

Anyone here possibly have a set of these, before i order an aftermarket chuck this week?

Jeremy - I've a spare set of unused jaws that I don't now need. Send me a PM.

Andrew M

You need to check the pitch of the teeth with these chucks, some are imperial and some metric.

How do i go about confirming the pitch of the teeth on my current chuck?

I'm fairly sure the 1580 series 4" chucks are Imperial - if so the pitch of the teeth should be 5.08mm - that is the distance from the front edge of one tooth to the front edge of the following one, i.e. the total width of one tooth and the gap next to it. The height of the slot in the side of these jaws is 4.85mm.

The metric P-B 100mm jaws have a pitch of 6mm and a 7mm high slot.

If your chuck is Imperial, I think soft jaws type EJC will fit - for replacement hard jaws you could try try P/nos. 2580 10603 (inside), and 2580 10602 (outside). Both of these are now obsolete. I'm not absolutely certain these will fit, but it might give you something to go on. If you want to do further internet legwork, I found the dimensional / part no. information from pdf spec. sheets from Rotagrip and Thame Workholding's websites...

Edited By DiogenesII on 26/06/2021 19:20:02

Diogenes II has measured the pitch of an imperial measurement chuck. The tooth pitch is 5.08mm, or 0.2", 5 teeth per inch. If your chuck is a metric one the pitch will be 6mm. This is the easiest way to tell the difference between the 100mm chucks.