New Pratt chuck without mounting holes

New Pratt chuck without mounting holes

This topic has 5 replies, 4 voices, and was last updated 18 November 2019 at 14:06 by Stuart Bridger.

Viewing 6 posts - 1 through 6 (of 6 total)

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18 November 2019 at 12:41 #437812
old mart
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@oldmart
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
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18 November 2019 at 12:41 #13700
old mart
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@oldmart
18 November 2019 at 12:48 #437814
fishy-steve
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@fishy-steve
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.
18 November 2019 at 13:09 #437818
Ian P
Participant
@ianp
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
18 November 2019 at 13:51 #437820
old mart
Participant
@oldmart
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
18 November 2019 at 14:06 #437821
Stuart Bridger
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@stuartbridger82290
See **LINK**

Will tell you everything you need from the part number
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