Mystery change wheels

[Robert Bailey 1Participant @robertbailey1]

I purchased a Harrison L5A 11 inch which came with these change wheels that are for another lathe. I would be grateful for help identifying what they fit so I can sell them and the proceeds go towards obtaining some of the right ones. There's a total of 6, 16DP at 100 % confidence, Teeth 55, 60, 65, 70, 75 and 100. 3/4 inch bore, 1/2 inch wide, 1/8 inch keyway. The cast ones have a L4 marking and what looks like 88 or 86 but could just be marks from the runner or raiser.

[Robert Bailey 1Participant @robertbailey1]

[Martin ConnellyParticipant @martinconnelly55370]

Smart and Brown model M, possibly other models as well.

Martin C

[Robert Bailey 1Participant @robertbailey1]

Thanks, There were some Smart and Brown threaded catch plates included to.

[old martParticipant @oldmart]

I agree, the L4 is a common S & B casting / forging mark, and 16DP is one of their gear tooth sizes for the model M type.

[not done it yetParticipant @notdoneityet]

Not suitable for your lathe?

If you could cut centres, might it be a better to modify these than buy originals?

[sp@rksParticipant @sprks]

[old martParticipant @oldmart]

I agree that the Smart & Brown model M use 16dp gears and according to my charts are the only S & B lathes to do so. And L4 is commonly used by them in part/casting numbers. Other makes may also use the same gear sizes.

[Nigel Graham 2Participant @nigelgraham2]

Not Done It Yet –

As a Harrison L5 owner…

Easier to obtain the correct wheels from, e.g. Home & Workshop Machinery, and it may be possible to trade those S&B ones in.

The problem with mixing change-wheels is that even if they apparently match those that came with the lathe, their pressure-angles may differ.

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