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Model Forum / General / Models / August 2005Grinder Motor
The 3 phase motor on my Jones and Shipman 310 went *puff* this morning and the room filled with smoke. Not good. How special are grinder motors? Some sources will tell you that they're precision balanced and a standard motor won't do. I'm always suspcious of such claims since it's an electric motor that drives through a long flat belt and sit's under a ton of grinder. Do I need a special motor or will a foot mounted motor do the job? Thanks > The 3 phase motor on my Jones and Shipman 310 went *puff* this morning > and the room filled with smoke. Not good. [quoted text clipped - 5 lines] > > Thanks Charles, They are definately balanced complete with flat pulley (holes in end of armature iirc) but how much difference it'll make I don't know. Why not have the puffed motor rewound. A rewind & new bearings will be much the same price as a new motor but you'll preserve the balance and it least know it'll fit. If you are running quasi 3-phase I'd want to look closely why the smoke was let out - do you have a rather high wild phase perhaps on your converter? AWEM >> The 3 phase motor on my Jones and Shipman 310 went *puff* this >morning [quoted text clipped - 14 lines] >much the same price as a new motor but you'll preserve the balance and >it least know it'll fit. Not around here it won't. Rewind is £120 to £150, new motor is £60 to £80 >If you are running quasi 3-phase I'd want to look closely why the >smoke was let out - do you have a rather high wild phase perhaps on >your converter? Good point. >AWEM -- Regards, John Stevenson Nottingham, England. Visit the new Model Engineering adverts page at:- http://www.homeworkshop.org.uk/ > >> The 3 phase motor on my Jones and Shipman 310 went *puff* this > >morning [quoted text clipped - 34 lines] > Visit the new Model Engineering adverts page at:- > http://www.homeworkshop.org.uk/ I had a 1/2 hp drier motor rewound last week @ £85 - Peak Ignition of Thornton Heath. They are a special in that they are a long shaft motor but otherwise a normal resilent mounted jobby. Peak Ignition, The Hall, Hythe Road, Thornton Heath, Surrey, CR7 8QQ AWEM >> The 3 phase motor on my Jones and Shipman 310 went *puff* this >morning [quoted text clipped - 20 lines] > >AWEM Good point. Voltages are 385-385-450 a bit high but IMHO not high enough. Charles Charles, A daft thought I know but a voltage spike of 70 volts would to me induce an amount of imbalance in the motor and cause it to warm up. By the way how's the saw going. Martin P >>> The 3 phase motor on my Jones and Shipman 310 went *puff* this >>morning [quoted text clipped - 26 lines] > > Charles >Charles, > [quoted text clipped - 3 lines] > >Martin P The saw is fine - I can heartily recommend a Kennedy hacksaw as a useful small saw. Charles >> The 3 phase motor on my Jones and Shipman 310 went *puff* this >morning [quoted text clipped - 20 lines] > >AWEM Normally they only go down in the stator, so the armature balance wouldn't be affected on a rewind. A wound armature would be a bit unusual in a smallish motor. Peter -- Peter & Rita Forbes Email: diesel@easynet.co.uk Web: http://www.oldengine.org/members/diesel > The 3 phase motor on my Jones and Shipman 310 went *puff* this morning > and the room filled with smoke. Not good. [quoted text clipped - 5 lines] > > Thanks Some guy was selling tins of smoke on eBay, so that you could top up whatever you let the smoke out of.... Steve Steve has noticed .................. >Some guy was selling tins of smoke on eBay, so that you could top up >whatever you let the smoke out of.... > >Steve Yes Steve, but it was very special Joseph Lucas loom smoke! You don't get a lot of that for a pound these days. Mike  SignatureMike Whittome |
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