Mystery lathe backplate

Mystery lathe backplate

This topic has 6 replies, 3 voices, and was last updated 11 June 2019 at 21:23 by Howard Lewis.

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9 June 2019 at 18:24 #413436
old mart
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@oldmart
I have just bought a new 4" Burnerd chuck with both sets of jaws, model N30. Definitely imperial as the fixing screws are 1/4" Whitworth.

It came with a backplate which I have failed to identify, even by googling.

The backplate is held on the spindle by three 5/16" BSF studs at approximately 49mm pcd. From slight witness marks the flange of the spindle is 62mm diameter. A tapered projection of the spindle around 36mm with an included angle of about 11 degrees centralises the backplate.

Someone must know.
Advert

9 June 2019 at 18:24 #13551
old mart
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@oldmart
9 June 2019 at 20:17 #413453
David George 1
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@davidgeorge1
A picture would help to identify please.

David
10 June 2019 at 10:44 #413515
Howard Lewis
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@howardlewis46836
If the chuck is new, it seems odd that the fixings are 1/4 BSW, rather than Metric. But given that, you would expect the the other dimensions to be Imperial also, rather than Metric

The closest Imperial size to "approximately 49mm" would be 1 29/64" (1..9219" ),

or more likely 1 15/16 (1.9375" – 49.2125 mm )

Howard
10 June 2019 at 12:38 #413547
old mart
Participant
@oldmart
I will try and post a couple of pictures. The chuck is unused but pretty old, made in England, definitely predating the metric 100mm versions. Having stripped, cleaned, lubricated and re assembled it is a beauty, both sets of jaws are tight and body and jaws serial numbers match. I couldn't resist the price, £45.50 including postage.

Edited By old mart on 10/06/2019 12:47:00
11 June 2019 at 16:59 #413735
old mart
Participant
@oldmart
The mount on the Siege SC6 looks a bit like a contender.

http://www.mini-lathe.com/C6_lathe/C6/c6.htm#Chuck and Chuck Mounting
11 June 2019 at 21:23 #413789
Howard Lewis
Participant
@howardlewis46836
If it old, but unused, I would expect the dimensions all to be Imperial.

However, that would not stop someone from making a backplate with a Metric OD, and fixings.

But the register would still need to be Imperial, as will be the PCD for the Backplate/Chuck fixings.

Howard.
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