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New Pratt chuck without mounting holes

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old mart18/11/2019 12:41:34
4655 forum posts
304 photos

I noticed this brand new 100mm/ 4" Pratt chuck on ebay, which has obviously never been on a lathe, there are no threaded or plain mounting holes. Do you think it was originally a special order? I would have been interested, but I chanced upon a new one myself, by accident which has holes already which will eventually be used for small stuff.

 

https://www.ebay.co.uk/itm/PRATT-BURNERD-4-3-JAW-WITH-REVERSIBLE-JAWS-CENTRING-LATHE-CHUCK-2-SETS-JAWS/323983382320?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3Df6b1c3208d3742eabdc4567fa0076e31%26pid%3D100675%26rk%3D1%26rkt%3D15%26sd%3D323983382320%26itm%3D323983382320%26pmt%3D0%26noa%3D1%26pg%3D2380057&_trksid=p2380057.c100675.m4236&_trkparms=pageci%3Aea9e6c50-0a00-11ea-991f-74dbd1804aa7%7Cparentrq%3A7e89656c16e0ac3d187bd756ffeebd2c%7Ciid%3A1

Edited By old mart on 18/11/2019 12:44:45

fishy-steve18/11/2019 12:48:37
122 forum posts
30 photos

It looks like it originally had a screwed bore. If you look closely it's had a screwed insert added and locked with a grub screw.

Steve.

Ian P18/11/2019 13:09:10
avatar
2747 forum posts
123 photos

I would have thought that the mounting details would be shown in the PB catalogue but what is wrong with the three mounting holes seen in your picture?

Whilst self centering this is a lever operated rather than a key operated chuck.

Ian P

The eBay pictures, not yours I mean

Edited By Ian P on 18/11/2019 13:10:12

old mart18/11/2019 13:51:10
4655 forum posts
304 photos

Good answer, Ian, I had not twigged the lever part. The mounting holes are either three at 120 degrees, or two at 180 degrees. There is no picture of the side of the chuck. And with further scrutiny, the plate with the holes screws to the centre and is locked with an axial grub screw, and two serial numbers match the fitted parts (and the jaws).

Edited By old mart on 18/11/2019 13:55:48

Stuart Bridger18/11/2019 14:06:50
566 forum posts
31 photos

See **LINK**

Will tell you everything you need from the part number

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