I have acquired (for free!) a Fobco Star benchtop drill. Not sure how old it is, but it looks like it has seen some use. A little rough around the edges, but in good order mechanically.
It is fitted with a Brook 'Gryphon' (sp?) motor, in which the bearings sound like they have seen better days and are squeaking under load. I am thinking of replacing the motor and fitting an inverter for better control of the speed. The problem I am having is trying to remove the motor pulley to get the old motor out.
Here are the steps taken so far:-1). Grub screw removed, tried carefully levering pulley off. No joy. 2). Sprayed some penetrating oil in the top and through the grub screw hole. Left to soak overnight. Tried levering again - nothing. 3). Heated pulley up with hot air gun to approx 100 deg C - still no movement. 4). Dug out the three leg puller (I know the pulley is cast iron, so am going very gently so as not to break lumps off the pulley). Put as much pressure on the pulley as I dare, with more heat and oil. Still no movement. Puller will be left on overnight, under tension, to see if something will move.
Can anybody suggest the next course of action? As I see it, options are to cut the pulley off the motor shaft, then machine the pulley to remove the remains of the old shaft. Not a big deal as the motor is being replaced. The new motor has a 14mm shaft, whereas the original motor, as far as I can measure it, has a 16mm shaft. This means some work on the pulley is necessary anyway to make an bushing to fit the new motor.
Any advice appreciated.
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