Change Gear size DP

[BazyleParticipant @bazyle]

identification of gear

[BazyleParticipant @bazyle]

Anyone know which lathes use 16 DP changewheels?

On the Drummond Yahoo group someone has a 16 DP gear with a pin hole on .88pcd almost like a Drummond one which would be 14DP. Width is .445in, bore 5/8.

Newer Myford are 20 DP and Boxford 18 DP. I imagine the first Myford ones were the same as Drummond but did they perhaps shrink in stages during the war and post war austerity period? Or does one of the many other small lathes of that age use this DP and pin instead of keyway?

[John Stevenson 1Participant @johnstevenson1]

Colchester's / Harrison's are 16DP on early models, later ones are 1.5 MOD which is very close to 16DP and makes it hard to differentiate.

 

Also the 16DP are 14.5 degree pressure angle and the 1.5 MOD are 20.

Only ones I have seen with the pin are Myfords but dare say they copied it from somewhere but I'm no expert on various machines.

 

The pre war Colchesters were far removed from post war machines, a lot cruder as most were or perhaps they had a pin ?

Edited By John Stevenson on 15/05/2015 13:58:39

[BazyleParticipant @bazyle]

thanks John. Seems like eveyone assumes a pin means Drummond but there are some ringers.

[Paul BarterParticipant @paulbarter66156]

Myford ML4 uses pins to couple/drive the speed change wheels on 5/8 bores, no keyway.

[RobboParticipant @robbo]

Atlas used 16DP 14.5 degree changewheels, but of course they used alloy for the wheels and they had a twin keyway.

I would guess its probable that the Atlas clones, Halifax, Sphere, and Acorn also used 16DP but don't know what their wheels were made of.

I think the larger Drummonds also used 16DP

I have a 100 tooth 16DP 14.5 degree changewheel, got by accident, which is looking for a new home if anyone is interested.

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