tubenut said:
It still works, but the motor is very slow to come to speed now and it doesn't sound stable. It is over 20 years old at this point, so maybe it is just time for an upgrade. I'm in no rush obviously to replace it.
Give the pulley a pull upwards, the motor will push up against the plinth. If the pulley is loose, it generally plops of with a little force.
Or you can hold the pulley between your fingers with the motor switched on (only couple of seconds though) but allow some slip. If pulley is good, you will feel a constant pressure/slip , if it is loose you can typically feel movement from the motor but the pulley is stationary in your hands.
You may even be able to see inconsistent spinning of the pulley on start up through the glass platter. On a good pulley the belt slips, the motor/pulley is up to speed quickly/instantly.
When last did you change a belt? It has the same effect as well..... Clean everything with some isopropyl alcohol...
Else check the caps, the symptoms of failure of pulley or caps are similar.
Or you can hold the pulley between your fingers with the motor switched on (only couple of seconds though) but allow some slip. If pulley is good, you will feel a constant pressure/slip , if it is loose you can typically feel movement from the motor but the pulley is stationary in your hands.
You may even be able to see inconsistent spinning of the pulley on start up through the glass platter. On a good pulley the belt slips, the motor/pulley is up to speed quickly/instantly.
When last did you change a belt? It has the same effect as well..... Clean everything with some isopropyl alcohol...
Else check the caps, the symptoms of failure of pulley or caps are similar.
mmmm ... I would have tried to use the 8 inch floppy drive motors rather than the 3.5 or 5.25 motors ... 12 VDC, chopper stabilized (pulse width modulation), precise RPM control is same, same as the smaller motors ... 8" drive torque and moment of enertia is better ... 
inertia....
yup, I agree a bigger drive motor is better, but audio oragami has stated that the 3.5" floppy drives are tougher to stop than one might think. Hmmm... do as Audio Note did and use multiple motors on a lightweight platter---huge interia possible.
Fast Eddy... you got a little Clampet genes in your pool? (being from californie and all....)
yup, I agree a bigger drive motor is better, but audio oragami has stated that the 3.5" floppy drives are tougher to stop than one might think. Hmmm... do as Audio Note did and use multiple motors on a lightweight platter---huge interia possible.
Fast Eddy... you got a little Clampet genes in your pool? (being from californie and all....)
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