Tom Senior S type 6″ rotary table – backlash adjustment?

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Tom Senior S type 6″ rotary table – backlash adjustment?

This topic has 9 replies, 6 voices, and was last updated 10 October 2022 at 22:26 by John D.

Viewing 10 posts - 1 through 10 (of 10 total)

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13 September 2018 at 15:37 #13294
mike robinson 2
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@mikerobinson2
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13 September 2018 at 15:37 #371527
mike robinson 2
Participant
@mikerobinson2
I have been lucky enough to find a Tom Senior S type 6" rotary table in very good condition, other then a bit of backlash which I would like to adjust. I cant find any user manual but the knurled knob on the right side, when undone seems to slacken up the engagement of the worm, but when tightened still doesn't remove the backlash. I guess given its age it's understandable.

here is the link to a photo in my album, but I could not manage to upload the photo without its orientation changing

https://www.model-engineer.co.uk/albums/member_photo.asp?a=49073&p=811742

Any guidance on adjusting the backlash very welcome, a photo of my rebuilt Tom Senior Model E is in the same album, also with a bad orientation

Mike
13 September 2018 at 16:53 #371533
Michael Gilligan
Participant
@michaelgilligan61133
Mike,

According to the picture posted by 'RICHARD GREEN 2' on this previous thread: **LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=137906&p=1

"A neat arrangement for disengaging the worm is fitted …"

I may be wrong, but: that doesn't really sound like the knob is an adjuster.

MichaelG.
13 September 2018 at 17:45 #371543
Brian Wood
Participant
@brianwood45127
Michael,

The link fails to work I'm afraid and neither does the web address, they both bring you straight back to Mike Robinson's post

Regards

Brian
13 September 2018 at 18:23 #371548
Michael Gilligan
Participant
@michaelgilligan61133
Sorry, Brian … I had too many tabs open & selected the wrong one

This should do it:

https://www.model-engineer.co.uk/forums/postings.asp?th=121855

MichaelG.

Edited By Michael Gilligan on 13/09/2018 18:31:30
14 September 2018 at 09:30 #371649
Brian Wood
Participant
@brianwood45127
Thank you Michael, information as promised. They are nice looking tables too aren't they, very low profile.

Regards

Brian
14 September 2018 at 11:00 #371668
Robbo
Participant
@robbo
Mike

My Tom Senior 6" table is older than yours, and where you have a knurled knob on the side mine has a big grubscrew with a locknut. This definitely alters the relationship of the worm to the wormwheel (but I can't remove backlash entirely). So it seems that the knob is in the right area for an adjuster. Maybe there was a brass plug in there that has worn out/got lost so that you run out of thread before completely tight on the end.
14 September 2018 at 11:33 #371673
SillyOldDuffer
Moderator
@sillyoldduffer
Posted by mike robinson 2 on 13/09/2018 15:37:07:

I have been lucky enough to find a Tom Senior S type 6" rotary table in very good condition, other then a bit of backlash which I would like to adjust.

…

How much is 'a bit of backlash'? I'm not familiar with your rotary table, but could the backlash you have be normal? As eliminating backlash entirely from a gear-train is quite difficult and may increase wear, it's not unusual to find some backlash even in posh kit.

Dave
14 September 2018 at 17:37 #371728
mike robinson 2
Participant
@mikerobinson2
Thanks for the responses, I will measure the backlash over the weekend and post my findings for your opinions. I might explore whats behind the knurled nut too….. thanks
10 October 2022 at 22:26 #616839
John D
Participant
@johnd
Posted by mike robinson 2 on 14/09/2018 17:37:38:

Thanks for the responses, I will measure the backlash over the weekend and post my findings for your opinions. I might explore whats behind the knurled nut too….. thanks

Did you ever get to the bottom of your backlash? I have the same one and stripped it down to clean today. There's a fine line between smooth running hand wheel and not being able to rotate the table a tiny amount by hand. Wondering what your experience has been in use..
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