Unimat 3 vertical mill/drilling attachement pulley

This topic has 9 replies, 4 voices, and was last updated 21 October 2020 at 16:05 by Alan Gosling.

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20 October 2020 at 13:08 #502266
Alan Gosling
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@alangosling27395
Hi, I have received a Unimat 3 lathe and vertical drilling/milling attachement. Everything is in good order except the drive pulley for the vertical attachement is broken.

Anyone know where i can get a new one or can someone supply me the sizes so i could make one on the lathe? The pulley appears to be screwed on and at present the remaining bit has not been removed.

Thanks

Alan
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20 October 2020 at 13:08 #14056
Alan Gosling
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@alangosling27395
20 October 2020 at 13:22 #502269
JasonB
Moderator
@jasonb
Have a word with Pro Machne tools, they list a metal replacement.
20 October 2020 at 13:28 #502270
Alan Gosling
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@alangosling27395
thanks that is excellent
20 October 2020 at 13:31 #502271
JasonB
Moderator
@jasonb
If you do want to make one it's the same as the lathe Or you could just swap them over as needed
20 October 2020 at 13:51 #502273
Alan Gosling
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@alangosling27395
Thanks for confirming it is the same as the lathe
20 October 2020 at 13:57 #502275
not done it yet
Participant
@notdoneityet
At over £43, I expect you will make one?!

I have a whole string of ally pulleys. I would send you one at cost (might not be economical, depending on your location) if I have one of the right size.

Edited By not done it yet on 20/10/2020 14:01:41
20 October 2020 at 21:37 #502355
John Olsen
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@johnolsen79199
On my Unimat 3, of nearly 40 years vintage, the pulley thread on the vertical attachment is 12mm by 1mm pitch. The one on the lathe spindle is of course 14mm by 1mm pitch, so that you cannot use the lathe pulley on the vertical spindle. Later production may of course vary, and it would have been a sensible idea if they did later make them the same . I made a set of toothed belt pulleys for my machine, which is quite a worthwhile modification.

Incidently, the speed ratings on the nameplate are purely the product of somebodies fevered dreams and the actual speeds are totally dependent on the load anyway. This does not seem to matter much in practice.

John
21 October 2020 at 15:58 #502505
Alan Gosling
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@alangosling27395
Posted by John Olsen on 20/10/2020 21:37:58:

On my Unimat 3, of nearly 40 years vintage, the pulley thread on the vertical attachment is 12mm by 1mm pitch. The one on the lathe spindle is of course 14mm by 1mm pitch, so that you cannot use the lathe pulley on the vertical spindle. Later production may of course vary, and it would have been a sensible idea if they did later make them the same . I made a set of toothed belt pulleys for my machine, which is quite a worthwhile modification.

Incidently, the speed ratings on the nameplate are purely the product of somebodies fevered dreams and the actual speeds are totally dependent on the load anyway. This does not seem to matter much in practice.

John

Thanks John my machine wiill be about that age as well. I have now sourced the correct pulley and about to post seperatly for anyone else
21 October 2020 at 16:05 #502507
Alan Gosling
Participant
@alangosling27395
Posted by JasonB on 20/10/2020 13:22:18:

Have a word with Pro Machne tools, they list a metal replacement.

I have now found the correct pulley after several emails to emcomachinetools.co.uk Vertical pulley for unimat 3 vertical attachement
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