I'm trying to repair a loader for a machining cell. A shaft that drives the loader between
machines is highly fubared. 25mm shaft that is now 22mm where one of the bearings ride.
No wonder we were getting torque alarms.

Anyway, my co-worker welds up the shaft for me. Btw, wrapping things with fiberglass tape
that you don't want weld on is fairly handy. He got carried away slightly and welded a
few threads that the bearhug nut uses to secure the bearings.

No big deal, 10 mm of threads, 1.5mm pitch. I'll just put the lathe in neutral and turn
the chuck by hand since this is an imperial machine and you can't open the half nuts.

Read the charts, put the gears and levers in the right place, pick up the thread and damn,
I'm cutting where I shouldn't be.

Back away from that part Wes, something is wrong.

I spent over an hour looking all over this lathe, reading the chart over the QC gearbox
and finally I started working though the ranges and measuring pitch. I finally found a
combination that cut a 1.5 mm pitch but it isn't what the chart indicated. This is on a
Servoshift Leblond. I had the right change gear combination installed.

The moral of the story, if you are going thread something that really needs to not be
screwed up, either know your lathe or make a test pass on scrap to check your setup or do
both.

Wes