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What are these change gears for?

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AdrianR24/05/2019 11:40:48
534 forum posts
36 photos

I have a 127/100 combination gear that I am trying to identify what lathe it is for.

DP 18

PA 14.5

Shaft 5/8"

127t thickness 3/8"

100t thickness 7/16"

Overall thickness 13/16" ie same as 3/8" gears with 1/16" clearance.

Any one know what lathe would use this?

Clive Brown 124/05/2019 12:36:23
643 forum posts
26 photos

Similar to my Boxford ME10.

AdrianR24/05/2019 14:27:09
534 forum posts
36 photos

While digging trough more boxes I found 49t change wheel of similar dimensions that meshes fine. In the casting it has an embossed diamond with S&B. Could that be Smart & Brown?

Brian Wood24/05/2019 14:34:28
2400 forum posts
37 photos


That logo was the one used by Smart and Brown. The 100/127 conversion gear would very likely have been made for the Sabel lathe, S & B's copy of the US Southbend



AdrianR24/05/2019 15:05:51
534 forum posts
36 photos

Ahha, that is exactly what I have This site has a picture

12 years ago I helped my wife clear her step fathers workshops. Most had already been sold off, the bulk of the remainder was red rust thanks to a leaky roof and a break in. Heart breaking seeing the slip gauges over the floor in a rusty puddle. Now seeing that Sabel I realise that was the rusty mound in the corner. I did look at it and wanted it, but at the time did not have the space. Oh for a time machine.

Pete Rimmer24/05/2019 16:40:23
979 forum posts
57 photos

That's quite a valuable gear being similar pitch to Boxford. If you have no use for it then put it on eBay with a low start you might be pleasantly surprised at what it fetches.

old mart27/05/2019 14:25:47
3070 forum posts
194 photos

I have just looked up the change gear specs for the S&B Sabel, and they are slightly different from your figures.


18DP 20PA 3/8" wide and 9/16" bore.

The double gear would likely have a larger bore.

Edited By old mart on 27/05/2019 14:28:06

AdrianR27/05/2019 19:07:09
534 forum posts
36 photos

Hmm, maybe the compound gear is Boxford then, which is good as I am thinking of selling it.

Martin Connelly27/05/2019 19:18:22
1757 forum posts
189 photos

It could also be used as an indexing plate for anyone who wants to cut 127 tooth gears to suit some other gear profile. Advertise it for this use as an option and you may get more interest in it.

Martin C

old mart27/05/2019 21:36:35
3070 forum posts
194 photos

The lathes website sells gears for Boxford

Edited By old mart on 27/05/2019 21:37:35

Pete Rimmer27/05/2019 23:51:27
979 forum posts
57 photos

I think it is probably Boxford too. Boxford and Denford both used 18DP change gears but the Denford ones were 20pa.

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