Tom Senior Junior

[Graham WhartonParticipant @grahamwharton]

Hi Folks,

I have a couple of questions regarding a Tom Senior Junior Mill.

1. How do you tension the belt for the table power feed drive. It looks as though it is possible to loosen the bolts securing the table feed pulley/UJ assembly and move it a bit and retighten. Not sure this is the right way though. Am I missing a tensioner mechanism like there is on the M1?

2. The optional knucklehead fits in place of the horizontal support arm and is driven from a pulley on the rear. It is not driven from the horizontal spindle as the M1 is. So my question is, is the drive taken directly from the motor, and thus limited to 3 speeds and belt tensioning done through spacers changing the motor height, or was it intended to be fed from the spindle pulley on the rear with some other tensioning mechanism.

3. Does anyone have any details on the coolant pump fitted to the Junior, and know if it is different to the M1.

If anyone has any detailed pictures of the back of the Junior showing the correct belt arrangment, that would be appreciated.

Thanks

Graham Wharton

[Graham WhartonParticipant @grahamwharton]

[Michael GilliganParticipant @michaelgilligan61133]

Graham,

Not sure if it helps, but there are a few references to the Junior in this document.

MichaelG.

[Graham WhartonParticipant @grahamwharton]

Cheers Michael. Ive had a good read through that document before, unfortunately it skips over many of the differences between the Junior and the M1 models.

[Brian WoodParticipant @brianwood45127]

Hello Graham,

I can't help you with your question on the knucklehead, I don't have one and haven't seen one set up

I have attached 3 photos of the belting on my machine. There seems to be no adjustment for tensioning to the table feed drive. The suds pump is driven off the vee on the outer end of the bottom pulley. The main drive belt from the motor runs around the outside of all the pulleys, tensioned initially by jacking the motor on it's mounting bolts. Then finally by swinging the eccentric mounting for the drive input into full tension and held by the pin.This last action also tensions the belt inside the body of the mill.

I usually leave that setting un-tensioned so as to avoid stretch and permanent 'sets' in the belt when I am not using thye mill

I hope that helps you

Brian.

[Graham WhartonParticipant @grahamwharton]

Thanks Brian. It confirms I don't have a tensioner missing on the table drive

Here's a picture of the knucklehead (well, a stripped one) offered up to the column.

Graham

 

Edited By Graham Wharton on 13/01/2014 16:16:21

[Graham WhartonParticipant @grahamwharton]

An alternative view, hopefully showing how it is driven via the drive shaft that goes through the column to the rear with its own pulley.

I guess it must be driven via a belt directly from the motor and be limited to 3 speeds. The only other way would be to drive it via a belt from the countershaft but you would restrict some of the speeds as there would be two belts on the bottom pulley at the same time.

Graham

[Brian WoodParticipant @brianwood45127]

Hello Graham,

Thank you for enlightening me, you have a really nice clean machine there too. I am a bit ashamed of the rather rusty appearance in the belt space behind my machine, I don't often take the cover off and if I was really fussy I would have made it look a bit prettier before taking pictures. The front end is a different story!

I've made it look more cared for since.

Regards

Brian

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