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Thread: Making a Faceplate Lathe
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24th March 2015, 08:24 AM #16
Thanks Rob - very interesting. The weight of the drive-motor hanging on the drive belts seems to work quite well in many situations (including my Altendorf panel saw), but like you I'm not sure about the implications of this in all situations. As long as the belts aren't slipping during normal use I can't see how it would present a problem?
WayneDon't Just Do It.... Do It HardenFast!!
Regards - Wayne
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24th March 2015, 03:27 PM #17Senior Member
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Rob & Wayne
I would suggest you consider some kind of positive tension (or retention) beyond gravity. A motor can give a very destructive 'kick', particularly in direct on line starting, or abrupt stopping scenarios. Think bent shafts, spindles and broken pulleys, gears or worse.
There's always the question of what should be the "weak link" in the event of overloading, and to my way of thinking it would be preferable that electrical overload (VFD, DOL or fuse) triggered first, followed by minor mechanical sacrificial elements like a shear pin.....even key's in shafts are designed to be sacrificial, although I've never seen a sheared key. I imagine the shaft and pulley/gear would be badly damaged either way.
Admittedly, when things go wrong, the simple inertial load of heavy components can wreak havoc before the electrical limits can take effect.
Regards
John
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29th March 2015, 08:39 PM #18
really enjoyed all that. fond of old machinery.
cheers mate
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31st March 2015, 10:54 AM #19
Yes, those are quite valid considerations, John. In a "gravity" motor situation there's usually some type of slotted adjustment bracket where the motor position can be fixed to maintain the optimum belt tension, but this still wouldn't compensate for potential issues with any "kick" in the drive train. There's always seems to be an element of blind faith in these things, doesn't there? We generally just need to temper this with some basic common sense and precautions.
WayneDon't Just Do It.... Do It HardenFast!!
Regards - Wayne
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21st October 2023, 07:05 PM #20
Can't believe I missed this thread. Incredible stuff Rob.
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