[TheForge] Sprocket with the spline stripped out

[Darrell]

The spline stripped out of the drive sprocket on the roto tiller on my
Mitsubishi tractor the other day. I searched the internet and called all of
the tractor parts places I could find. No joy any where. The best I could
find is a place in Portland OR. that would make me one for about $500.00.
So out to the shop. I built the inside of the hub up with 7018 doing a
narrow weave pass, let cool, chip slag, rotate a new area to the bottom and
repeat until I had enough metal build up.
Then I chucked it up in the lathe and bored the hub out to the minor
diameter of the spline. I ground a tooth cutter out of an old file and put
it in a tool holder on the lathe. There was just enough of the old spline
pattern on the end of the hub to use as a start. I wrote s short program for
the lathe that would run the tool in the length of the hub, move away from
the hub, retract out of the hub, move .003" more into the hub and repeat
until I reached the depth needed for the spline. Rotate the spindle to the
next point and run program again.
It took about two hours but it worked and the field is roto tilled.
Darrell

http://www.machinemaster.com