1920s Lathe spindle removal

[Aston ManningParticipant @astonmanning46959]

I have an old 1920s LM lathe which requires a new belt, I need advice on how the spindle is removed so I can put the new poly V belt on

[Aston ManningParticipant @astonmanning46959]

[bernard towersParticipant @bernardtowers37738]

1920s with Polyvee that's novel and it proves the spindles been out before!

[David George 1Participant @davidgeorge1]

I have never heard of a LM lathe have you a picture or other information.

David

[Ady1Participant @ady1]

Whichever lathe it is they tend to come out of the front

[Dave HalfordParticipant @davehalford22513]

T&LM – I had one of those. If it is just don't take the felts out

Most 1920 lathes were built like this the section drawing will help you understand

[Aston ManningParticipant @astonmanning46959]

[Howard LewisParticipant @howardlewis46836]

Anything opn Lathes UK website?

Howard

[Michael GilliganParticipant @michaelgilligan61133]

Posted by bernard towers on 17/05/2023 17:14:44:

1920s with Polyvee that's novel and it proves the spindles been out before!

.

A very logical upgrade

… dead easy to cut a set of shallow vee-grooves in an existing flat-belt pulley

MichaelG.

[DiogenesIIParticipant @diogenesii]

..Are there slotted ring-nuts on either side of each of the bearings?

..bit hard to see in the photo's..

Howard, see link in Dave Halford's post of the 17th..

[Aston ManningParticipant @astonmanning46959]

Hi all,

thanks for the replies.

yes it has slotted ring nuts one which screws in to a bronze bearing sleeve furthest from the chuck and two closer to the chuck.I will get some better pictures tomorrow. I'm unable to remove the gear that is for the change wheels it is too close to the back gear to put anything in to prise it and I cant fit a removal tool in I think I have to remove that gear and the rest should come off of the spindle.

It's a similar set up to the picture below

[DiogenesIIParticipant @diogenesii]

" I'm unable to remove the gear that is for the change wheels it is too close to the back gear to put anything in to prise it and I cant fit a removal tool in I think I have to remove that gear and the rest should come off of the spindle. "

I shouldn't prise or pull anything too hard until you are sure all the fixings are out, there could be more than one – how is/was it (apparently) secured to the shaft.?

Some more photo's would be very useful.

Edited By DiogenesII on 24/05/2023 06:35:26

[HopperParticipant @hopper]

The gear on the end of your spindle may possibly be like some Myfords and have a tiny grub screw fitted into a threaded hole drilled and tapped in the very end of the spindle, lengthways, half in the gear and half in the spindle. You have to remove the screw from the very end of the spindle before the gear can be removed. Post a few pics from different angles would be helpful if that does not work.

Someone has done a nice job on grooving the pulleys for Poly V belts. Are you sure the belt needs replacing already? Seems a shame to disturb it all unless absolutely necessary.

Edited By Hopper on 24/05/2023 09:10:17

[Aston ManningParticipant @astonmanning46959]

If I get some time today I'll take a better picture

[DustyParticipant @dusty]

I might be old and thick, but how are you going to get the belt on without removing the spindle? If all else fails take the bearing caps off and remove the spindle that way. You will be able to see a lot more with it on the bench.

Whoops, having had another look it appears that there are no bearing caps.

Edited By Dusty on 24/05/2023 16:54:12

[DiogenesIIParticipant @diogenesii]

So. ..an inboard pinion driving a tumbler reverse (or is it a dog-clutch) within the headstock?

[Ady1Participant @ady1]

I did a Drummond here which may be of some help

I think the best advice I can give is have a digital camera handy and take loads of pictures as you progress through the task

Edited By Ady1 on 26/05/2023 10:29:35

[egaParticipant @ega]

Posted by Hopper on 24/05/2023 09:01:08:

The gear on the end of your spindle may possibly be like some Myfords and have a tiny grub screw fitted into a threaded hole drilled and tapped in the very end of the spindle, lengthways, half in the gear and half in the spindle. You have to remove the screw from the very end of the spindle before the gear can be removed. Post a few pics from different angles would be helpful if that does not work.

Someone has done a nice job on grooving the pulleys for Poly V belts. Are you sure the belt needs replacing already? Seems a shame to disturb it all unless absolutely necessary.

Edited By Hopper on 24/05/2023 09:10:17

I think that grub screw is known as a French key.

The poly vee grooves seem very narrow.

[HopperParticipant @hopper]

Posted by ega on 26/05/2023 10:49:38:

Posted by Hopper on 24/05/2023 09:01:08:

The gear on the end of your spindle may possibly be like some Myfords and have a tiny grub screw fitted into a threaded hole drilled and tapped in the very end of the spindle, lengthways, half in the gear and half in the spindle. You have to remove the screw from the very end of the spindle before the gear can be removed. Post a few pics from different angles would be helpful if that does not work.

Someone has done a nice job on grooving the pulleys for Poly V belts. Are you sure the belt needs replacing already? Seems a shame to disturb it all unless absolutely necessary.

Edited By Hopper on 24/05/2023 09:10:17

I think that grub screw is known as a French key.

That rings a distant bell. Maybe also a Dutch key?

[Ian PParticipant @ianp]

Posted by Aston Manning on 23/05/2023 22:02:49:

Hi all,

thanks for the replies.

yes it has slotted ring nuts one which screws in to a bronze bearing sleeve furthest from the chuck and two closer to the chuck.I will get some better pictures tomorrow. I'm unable to remove the gear that is for the change wheels it is too close to the back gear to put anything in to prise it and I cant fit a removal tool in I think I have to remove that gear and the rest should come off of the spindle.

It's a similar set up to the picture below

Judging by the pictures of your lathe the photo above is not at all similar as regards the headstock and spindle construction.

The link that Dave Halford gave (a few posts back) is much more relevant. It may not be identical as it does not have the back gear but if its the same make of lathe then the manufacturer will probably have used the same general design and there are enough clues in the drawing that will enable you to proceed.

It looks a really nice lathe and I suggest taking care and not rushing disassembly, hopefully there is a flat or dimple where the grubscrew sits so that any burr does not damage the front bearing (spindle must come out from the front)

Ian P

[Aston ManningParticipant @astonmanning46959]

Does anyone know what the slots on the gear are for? Also any ideas of a way to remove the smaller gear off the spindle there is only a 4mm gap between the large gear and the small gear

[Clive Brown 1Participant @clivebrown1]

Those "slots" are pegs put in to repair broken teeth. A common practice with older, hobby lathes.

[DiogenesIIParticipant @diogenesii]

Is that a slotted nut outboard of the small gear?

[Aston ManningParticipant @astonmanning46959]

Thanks all

what would be the best way to get the bull wheel off? It looks like it’s threaded. I don’t want to damage the teeth or the spindle

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