Tom Senior Vertical Head

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Tom Senior Vertical Head

This topic has 6 replies, 4 voices, and was last updated 27 September 2011 at 11:21 by Ian S C.

Viewing 7 posts - 1 through 7 (of 7 total)

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29 July 2011 at 14:12 #72625
The Merry Miller
Participant
@themerrymiller
This post is directed at David,

David some time ago you were going to dash out to Wilko’s and get one of their bike tacho’s so you could check out the spindle speeds of your TS vertical head.

Did you get anywhere with it?

Len.P
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29 July 2011 at 14:12 #21909
The Merry Miller
Participant
@themerrymiller
29 July 2011 at 19:31 #72632
David Clark 13
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@davidclark13
Hi There

Not found one yet.

Not a lot of stuff up here near John O’ Groats.

regards David
24 September 2011 at 20:56 #75361
Gavin
Participant
@gavin
Hope this is of some interest.

Taken from “Senior type E Vertical Milling
machine” smallish mannual.

A single phase motor running at 1420 rpm will
give spindle speeds of
500,970,1600 & 2800
A single phase motor
running at 920 rpm will give spindle speeds of 340,600,1000
& 1600
A
three phase motor running at 1360 rpm will give spindle speeds of
480,950,1640
& 2760
A three phase motor running at 700 rpm will give
spindle speeds of 260,490,685 &
1450

Gavin

Edited By Gavin Perham on 24/09/2011 21:03:27

Edited By Gavin on 24/09/2011 21:08:56
24 September 2011 at 22:47 #75364
The Merry Miller
Participant
@themerrymiller
I’m not certain if I ventured this info before on another thread but if I did well here it is again.

My TS M1 S type vertical head has a Brooks Gryphon motor at 1420 rpm.

It couples to the main spindle via four step polyvee pulleys.

The Wilko bicycle tacho gave the following readings in rpm.

282

500

900

1680

I was able to validate these readings by measuring the diameter of the pulleys as best I could and calculating the revs.

They were quite close to the tacho readings.

Len. P.
26 September 2011 at 16:59 #75439
The Merry Miller
Participant
@themerrymiller
Further to my last post.

I’ve just finished stripping the head down to follow up a clicking noise (suspect motor bearing) and discovered that the previous owner had replaced the original four-step pulleys with those of his own design made from cast iron.

I’ll never find out why he did this but it explains the reason for the discrepancies in the spindle speeds.

The question is now whether to re-machine the pulleys to get back to square one and the original speeds or just leave things as they are, comments would be welcome.

The spindle speeds I gave in the earlier post were correct for the pulleys as fitted.

The clicking sound emanated from the head were as a result of the loose keying of the spindle pulley. This pulley was keyed to the tophat sleeve by three 1/4 whit grubscrews spaced radially at 120 deg in the top of the sleeve at the join line with the pulley not radially through the side.

I say was keyed but two grubscrews were missing and the third was loose so causing the clicking noise.

This is a well known technique for keying components to a shaft or sleeve but I still haven’t worked out why he did it this way.
27 September 2011 at 11:21 #75457
Ian S C
Participant
@iansc
I’d put in new grub screws with loctite. Ian S C
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