Tom Senior M1 dual spindle

Tom Senior M1 dual spindle

This topic has 3 replies, 2 voices, and was last updated 26 July 2024 at 00:10 by Chris Crew.

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25 July 2024 at 20:22 #743551
Chris Stevens 2
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@chrisstevens2
I have this old Tom Senior M1 mill, which started life at the Winfrith atomic energy facility back in 1959. Have been told it’s a dual spindle type and is very rare. The head is similar to an S, but is driven by a second spindle near the top of the column, and doesn’t have its own motor like the S head. Just wondering if anyone has seen anything like this at all? It runs very smoothly but is in need of cosmetic work obviously and some of the chromed parts need re-plating.
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25 July 2024 at 20:55 #743562
Chris Stevens 2
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@chrisstevens2
25 July 2024 at 23:50 #743583
Chris Crew
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@chriscrew66644
The auxiliary spindle looks to be mounted in the hole that would normally take the over arm bar when the machine is set up in horizontal mode. It looks like the mounting for the vertical head has been bolted or clamped to the column v-ways so the spindle could be removed, possibly as a self contained unit, and the machine then becomes a standard horizontal model if the over arm is available. This modification could have been done by Senior’s or by the workshop it was supplied to. It’s certainly a novel machine and probably a one-off.
26 July 2024 at 00:10 #743584
Chris Crew
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@chriscrew66644
Having just checked on lathes.co.uk it appears this variant was available from Senior’s and only two machines of this type are known to exist. You must have one of them or possibly a third one has appeared.
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