catalina0029
Member
I tried to get in contact with John Smith to get the input shaft to my SOS repaired the Smith way. I never got a response so I set out to do it myself. I bought a Harbour Freight 5" bench grinder and mounted it up-side-down on my lathe and surface ground the hex into the end of the shaft.
I welded a 1/4” plate to support the grinder and used the stud in the front to bend the plate in the back to take really small cuts. I am amazed it came out to within 0.0015" flat and parallel on all 6 sides. The socket fits almost too tight.
The headstock gears all had odd numbers teeth so I had to index the part using something else. So, I wrapped apiece of duct tape on the headstock drum, marked where it overlapped and cut it to length. I took it off the drum, laid it on the work bench and marked it with 6 lines. I wrapped it back on the drum and used a fine scale to line up the flats. Don't look too close at the welding, it is terrible.
I welded a 1/4” plate to support the grinder and used the stud in the front to bend the plate in the back to take really small cuts. I am amazed it came out to within 0.0015" flat and parallel on all 6 sides. The socket fits almost too tight.
The headstock gears all had odd numbers teeth so I had to index the part using something else. So, I wrapped apiece of duct tape on the headstock drum, marked where it overlapped and cut it to length. I took it off the drum, laid it on the work bench and marked it with 6 lines. I wrapped it back on the drum and used a fine scale to line up the flats. Don't look too close at the welding, it is terrible.