Need to find 16 DP gears

Edited By ady on 21/10/2011 12:21:56

Edited By John Stevenson on 21/10/2011 12:26:22

Edited By John Coates on 21/10/2011 12:47:22

Hi John

If you want gears to run in mesh with existing 16dp wheels then take Drummond OFF the list as they are 14dp. You might get them to transmit drive with a 16dp but you run the real risk of damaging both. If you are thinking of getting a FULL set of gears, the ones for the early Drummond round bed also rise in 4s (10tpi lead screw) the standard set being, 20,20 24,28,32.36.40 44 and 64 with the extras for metric threads being 25,35,45,50 and 63. The gears for other Drummonds, later round bed, "B" type flat bed and "M" type rise by 5s from 20 to 50 or 65 with additional intermediate gears to give the metric threads (26,38,63,66,73 depending on lathe model)

The Drummond gears will also be a bigger diameter for the same number of teeth than the Barker gears which may give problems with assembling the trains that you will need. Myford gears being smaller (20dp) will probably be a lot easier to accommodate as well as being more readily available, but again you'll need to get hold of a full set.

I think some makers used 18dp (Boxford?) and these may be available in sets.

If you want to buy odd wheels to run with existing gears you really do need to get 16dp and the correct pressure angle - virtually certain to be 14.5 degree.

Keith