Being a Myford, the gears are likely to be 20 DP, 14.5 pressure angle.

(You can check with one of the changewheels, if they mesh nicely with the gears on the spindle)

Count the number of teeth on the pinion that meshes with the 65T wheel. The sum of gear teeth should be the same for both meshes.

(65+ pinion) = (30+ gear)

Normal Myford changewheels are 5/8″ bore, so MIGHT fit the shaft, without need for bushing or boring.

But you may need to make a collar, to retain it, and possibly a spacer to separate it from the other gear.

Probably teaching grand ma to suck eggs, but NEVER engage Back Gear and normal drive to lock the spindle to remove a stuck chuck. A sure fire way to break gear teeth!

There are safer ways!

Check on Lathes UK website for more info.

The ML3 and 4 are 3.5″ centre height, (ML1 and 2 were 3.125″ centre height. Even numbers were longer centre distance than the odd) and depending upon age, 7/8 BSW, 7/8 x 12 tpi, or if very late, possibly 1.125 x 12 tpi (But not with the 1.250 register of the later 7 Series)

HTH

Howard

Welcome Paul,

Missing parts are one of the hazards of buying second-hand and finding spares for long out of production machines can be difficult and/or expensive.    They turn up on ebay and asking on sites like this helps.  As far as I know, there isn’t a seller of Myford spares who carries this stuff,  so luck and patience kick in.

The gear set needed for screw-cutting and fine-finish as supplied with the lathe can be extracted from the manual.

Myford also sold extras:

Whether or not all these gears are needed depends on what you do, but Myford recommended buying another 20 toothed gear, and, if you have to cut metric threads, then 127 is the bees knees,

At this point I start guessing, so let’s hope a Myford expert will confirm.   I believe the gears are 20 DIametral Pitch, 14.5 degrees.  This is an early standard, but still widely available new.   Unfortunately, the standard covers the gear form, but not how the gear is attached to the shaft.   Not a showstopper, but a modern gear or one of the right size from an old machine will  have to be modified to fit the lathe’s shafts.  Maybe adding bushes, boring out, or adding a keyway, screw-fixing, or clip.   All do-able after a little experience has been gained, but unwelcome for beginners and those wanting to get on and make stuff rather than fix machines.

3D-printing is another alternative.   Find a kind person who can design gears in CAD and then have them printed either in plastic, or metal, or CNC cut.   Plastic 3D-printed gears are cheapest,  they don’t last as long as metal,  but are better than might be imagined.   There are commercial firms doing this work, like igus, but I have no experience of them.  Joining a club is a good way of finding ‘a kind person’.    Volunteers are less likely on the forum, probably because they don’t want to get sucked into doing favours.   Fair amount of time taken to 3D print gears, and we’re all busy!

Dave

OR

You could fit an electronic leadscrew kit:

Presentation

Is the one I chose.