Installation in the Lathe
The MG set after removal
The empty (and temporarily clean) motor compartment
Motor mounting plate with new tapped holes
The original drive pulley has a lot of damage to the keyway and a has a crack
working its way outwards from the corner of the keyway. It does not run true
and the grooves have a lot of wear.
Since I wanted to replace the damaged pulley anyway, I fabricated a new pulley
that was the minimum possible diameter (6") that fits on the gearbox. It
produces 3000 spindle rpm at 113Hz (not quite 200% base motor speed), and
more provides a little more low-speed spindle torque than the original.
New drive pulley and broach guide made for it
Note the relief around the inside edge for gearbox clearance
I did not take any pictures of the new drive installed using the old pulley and
the old belts. The new motor assembly was mounted on wooden spacers. This
setup was used for turning the new pulley, and it worked beautifully! Compared
to the MG setup, the lathe is extremely quiet. So quiet that I can tell I
might need to replace the bearings in one of the drive belt tensioners. :-(
With the new pulley installed, I cut down the wooden spacers to fit the original
drive belts. This was too long a stretch for the back-gear selector link, so
that function is being performed temporarily by a piece of safety wire:
Coming soon (hopefully):
Permanent installation with new belts
Single-phase cooling fan installation
Speed-control potentiometer (re)installation
Adding an interlock switch to the spindle lock
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