I,m new

[Paul Ford 1Participant @paulford1]

Hi all,

I am new to all this and need some advice.

I bought my first lathe, an old Union Gap bed that I have never really used much, it came with no tooling and I didn't have a clue.

With where I work now I am feeling the need for a lathe for making small one off parts and managed to find a small Granville lathe with loads of tooling and accessories.

My problem being it has the motor frame missing, looking around I see that it should have a layshaft with a triple pulley for the lathe and a large pulley drives by the motor.

Does anyone have any idea of the ideal size pulleys to use as I will need to make this item because I cannot find anything for sale.

Thanks in advance Paul

[Paul Ford 1Participant @paulford1]

Motor frame and layshaft missing

[Brian HParticipant @brianh50089]

Hello Paul and welcome.

This may help a bit.

http://www.lathes.co.uk/granville/index.html

Brian

Edited By Brian H on 11/02/2020 07:27:26

[Dave HalfordParticipant @davehalford22513]

Hi Paul,

The layshaft triple mirrors the headstock pulley to keep that belt the same length.

The layshaft input pulley on my old T&LM was 12" the motor pulley was 2" slowest speed was around 100rpm. A 4" motor pulley proved too fast for the plain bearings.

All picador A section parts parts.

[David George 1Participant @davidgeorge1]

I have never heard of a Granville lathe so had a look and they were made in Sutton in Ashfield just down the road from where I live.

David

[John HinkleyParticipant @johnhinkley26699]

Paul,

Brian has given you the best link available to try to establish which lathe is in question. The fact that it would come with tooling and accessories has to be a big plus-point in deciding whether to purchase or not. From a brief look at the lathes.co.uk site link, it would appear that the lathes are all roughly Myford size and I would be very surprised if you couldn't utilise a secondhand Myford layshaft, with or without the clutch, without too much jiggery-pokery.

I am assuming that you are UK based as that will make a difference to the validity of the advice you receive in terms of availability of suitable parts. I surmise that original replacement parts will be extremely difficult to source, if not impossible, as you appear to have found.

The drive system used in the designs shown on Tony Griffith's site were very common and similar for a large number of lathes of that era and I'm sure that a lot of them could be modified to fit. As Dave Halford has said, keep the drive and driven pulley sizes mirrored for the reason stated and use the motor to layshaft pulleys to obtain an acceptable speed range overall.

Good luck and let us know how you get on.

John

[Howard LewisParticipant @howardlewis46836]

Assuming that you are UK based, with 50 Hz mains, a four pole motor will run at about 1470 rpm.

You can use this figure to calculate the size of pulleys to provide a minimum sped of 100 rpm or less.

The pulleys on the Lathe will give you the sizes for the Layshaft. If you wish, you could have two cone pulleys on the layshaft. This would avoid the problem of having to move one belt under the other when setting certain speeds.

HTH

Howard

[Dave HalfordParticipant @davehalford22513]

 

Ye Olde layshaft, just a straight bar that happens to fit ball races in the wooden blocks and the pullies

Edited By Dave Halford on 11/02/2020 13:13:35

[Howard LewisParticipant @howardlewis46836]

For layshaft bearings you have a choice between plain bearings, ( Brass or Phosphor Bronze) with regular oil lubrication, or sealed for life ball races.

With a three step pulley set for the layshaft to Lathe, and another for the motor to layshaft, you would have nine speeds available.

Howard

[David George 1Participant @davidgeorge1]

Dave Halford you have left the chuck key in the chuck! Here is picture of my Drummond M Type it nay give you an idea or two.

David

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