What lathe are these change wheels off

I have just upgraded from a ML7 to a Super 7. Unfortunately the change wheels that came with the Super 7 don't appear to be from a Myford. They are thinner and have a plain hole in the centre with no keyway. There are two holes about 1/8" diameter on a diagonal across the main hole which I assume are used to drive the input and output of a gear train. There are 15 in total ranging from 28 to 75 teeth. The larger ones have a rim on the face and the recess is painted grey but slightly bluer than the Myford standard. Can anyone identify them please. Jan T

Sounds as if they could be off a Drummond?

Andrew.

They are the same as my M type Myford (Drummond) look on the bay for similar in Drummond lathe.

David

HiJan & Guys
They may be Drummond like these on mine note the hole's not keyways

From the description, I think these gears are Myford, though they may fit Drummond as well. Once upon a time I had an ML1 and the description of these gears fits with my recollection of the gears for that, and possibly some of the subsequent models. The plain bore and face pins idea predates the keyway and keyhole shaped carrier for the S7 etc. The pins locked two gears together to allow a compound train to be set up.

For the ML1, I'm sure the plain bore was 5/8 inch diameter (as are the later ones), and the two axial holes are 1/8 dia, though I don't remember the PCD. I'd guess about 1 inch, if so the pins are 3/16 outside the bore. I don't remember the gear thickness either, I'd have said it was the same as the later ones (i.e. 3/8 inch) but I might be wrong, and there's no guarantee the wheels I had at the time were original.

I think I recall there is a description of the development of Myford's change wheels in Tony Griffiths' site www.lathes.co.uk.

I've just had a rummage in the drawer with my collection of Myford change wheels in it, and found two with the axial holes, Both have also got the keyway as well, so that proves absolutely nothing.

Hope this helps

Simon

The Drummond gears were 14DP and these were used on the early Myfords. Check on Lathes.co.uk and it will tell you somewhere when they changed to 20 DP which was well before the Super 7. Probably the previous owner got them as 'Myford' off ebay not knowing the difference.

I have some gears like that: they are DP20 the same as Myford ML7 and Super 7 etc but have the smaller hole and two pin holes like a Drummond. (But Drummond M-type takes larger DP14 gears as Bazyle said.) I have always assumed they were off an earlier Myford such as ML1 etc but not real sure. If yours are DP20, they can be converted to fit the Super 7 etc by boring out the centre and cutting the keyway using a boring bar with bit turned sideways and racking the lathe carriage back and forth as a makeshift slotting machine. Laborious but it works. I have done a few this way.

A friend used to have a M type Myford, and his gears used pins, (about 3/32 or 1/8 dia from memory) instead of a key. my memory is that the holes were close to the central bore, and heavy mistreatment was likely to result in fracture. Certainly, I can recall making a couple of replacement gears for him. I used the same gear cutter as for the gears on my ML7, since the broken gears matched mine..

Howard