I know nothing!! :dunno:
Can you hand make a custom key to fill the gap??
With "mill" in your name, I thought you would know how to make it?? :dunno:Well I'm willing to try lol. How do I go about doing that? And would I make it the length of the whole worn part?
Judging by the deep lip cut on the axle closest to the seal by the hub moving on the axle, I think your best bet is replacing the axle. The area where the hub sits on the axle is probably now smaller than the actual ID of the hub, so its going to be a chore getting a hub not to spin on that axle from here on out.
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There might be other ways to save that axle. What about those thin metal rings used to restore the surface when a seal wears a groove? I forget what they are called. One could be pressed onto the axle where the lip is.
Then, a new key. Followed by another 'sleeve' on the outboard end of the key, if the ale is worn there as well.
Also perhaps add set screws to the hub and/or use loctite sleeve and bearing retainer.
If the above is not a good idea, have the hub bored and sleeved and turned to the new, smaller axle diameter. But this sounds like a lot more work and the above should be feasible.
Another idea: use a sharp punch to make a hundred divots in the axle. Each will raise a metal crater. Think of this as a poor man's knurl. This will increase the OD of the axle, enough for the hub to grab. The little metal mounds will self-level as you reinstall the hub.
I'm sure there are other ideas as well.
This is a low speed/low load machine, so it should not take much to keep the hub on square and secure.
Perhaps braze instead of weld. Brass will be strong enough and it will be easier to shape.I'm also wondering if stick welding the splits in the axle then filing the welds so the key way fits nice and snug.
I also found a pair of axles on ebay but now I'm afraid they won't be the right ones based on what Arcam said. I don't know how to discern the difference.
Gravely Tractor Lawn Mower 812 Rear Axle Shafts | eBay
Don't open it up until you can locate the right axle. Yours is a 73 and most likey has a limited slip diff. That might be a different part number from the axles made after 74.
Perhaps braze instead of weld. Brass will be strong enough and it will be easier to shape.