Union Drill

First I removed the main wheel, which is held on by a push-fit on the shaft and a set screw. Came off fairly easily by pushing a large screwdriver blade in between the wheel and the main casting just to wedge them apart.

  

Removed the lock nuts from the top feed - nothing clever here, just two nuts locked together:

  

And the feedscrew just screws out. I say "just", lots of oil and gentle persuasion was needed as it was very stiff with rust. This was the way with most of the parts infact.

  

The bottom of the feedscrew pushes on a ball bearing race, containing 13 5/8" bearings. It's in two pieces so the balls will come out when the feedscrew is no longer holding it together:

The main drilling shaft turned, but was very stiff and I couldn't pull it out. So to remove it, I cut a piece of tube (the shiny bit in the pic below) and used the feedscrew to drive it down and hence push the main shaft down and out. This did it easily.

The gear is keyed onto the shaft using a sliding key which is pressed into the gear, and a slot on the shaft. So when the main shaft is slid out, the gear can just be lifted out sideways. You can see the key below:

The other gear is held onto it shaft using a tapered pin. I didn't have a drift the right size, so I made one up out of a bit of stainless bar. Note that, because the pin is tapered, it'll only come out from one side!

It was still very tight on the shaft after the pin was removed, so I had to drive the shaft out using a long drift and a hammer.

There's an adjustment screw which sets the rate of feed - this was very jammed in so it took a lot of plus gas, pliers and working at it to get it out. But come out it did.

The feed mechanism consists of a lever which bears on the cam of the side gear, with a pawl and spring attached. The lever runs on a shaft which is held in place by two set screws:

  

All quite stiff and siezed, but lots of oil and gentle tapping got them out. The pictures explain it all I think:

        

Unfortunately, the bolt and nut at the top which the pawl pivotted on broke in two, it was simply too rusty and sized. But that was the only casualty.

So I finally had a big box o' rusty parts, ready for cleaning, fixing, and repainting.