Motorising Assembly part 1

…if we evolved over millions of years, why is there so few of us? Where is everyone?…

I like the way engineering solutions evolve. This lathe wasn’t the first lathe ever built. It’s design evolved from countless previous lathes, but at some point in the past, there was a first lathe. Probably to turn wood. Something like a pole lathe or such like. Many incremental steps – design led – eventually produced a simple mass produced machine that works well, with all the niggly adjustment, lubrication and vibration problems resolved. Key point – design led.

Anyway, all power providing devices need a means to hold them in place. And so to the motorising assembly…

I’ve no pictures of the assembly in place before dismantling, but this is it laid out, so you can see the muck which has collected on it…

This view is the other way up…

…and shows:

A Motor base. Guess what sits on that?
B Countershaft arm
C Swing Head Assembly

The big pulley is the Countershaft Pulley with the Countershaft sticking out. This Countershaft goes through the two coaxial bores at the right hand end of the Swing Head Assembly.

Disassembly was quite easy. Basically unscrewing grub screws, unbolting things and using The Persuader to knock out shafts and pins. Here’s a selection…




Taking photos like these two…


…relates each Socket Set Screw – as they’re called in the diagram – to the part out which it came. Helps with reassembly. I felt this was necessary as each was a slightly different length. The second hole in the right hand collar is for the long pin shown in one of the previous photos.

The one difficult section was getting the Countershaft and the Countershaft Pulley to part company. After releasing its Socket Set Screw, I tried turning it with a big screwdriver here…

…because that seemed obvious. The screwdriver kept slipping out and damaging the slot. I resorted to a very large persuader and that did it. Why the screw slot is there, I’ve no idea.

Here’s all the parts arranged for their team photo…

Cleaning followed the usual process. Brushing off general muck, brushing on or soaking in Green Gunk, scrubbing off with various brushes, rinsing in water and drying by cloth, paper towels and hot air.

Fettling and reassembly next…