gmf motor rewind

[dodge at4]

hi all i had a lot of grinding to do with my gmf 1hp grinder and overheated it
i know they should be only used only for short periods of time but i had a bunch of large drills to sharpen and it must have
been running for over a hour
i realised but it was too late , too hot to touch and that burning smell
i understand its probably not worth repairing but its a good grinder and i've had it a long time
so does any one know a good rewinder eastern subs melb and a rough cost to just do a rewind on a 1hp 240v motor
probably cheaper to buy a second hand one cheers all

[KBs PensNmore]

Sorry, but I can't help with a place or someone to rewind it. You might be able to buy a cheaper used one, but will it be as faithful.
I'd look at getting it repaired first, if it was out of budget allowance, then I'd look for something else.
Kryn

[waxen]

C&A Motorwinder 97759071 Chris, Langwarrin

[China]

It was obviously on it's last legs I have run my GMF grinders for more than a hour with no problems, Last 1hp motor I had rewound a couple of years ago cost well over three hundred dollars, I could not
buy a replacement so had to go with it

[swarfless]

Agree with China, one hour run is nothing .. most likely bearings are shot & rotor was poling slightly which is a great heater-upper. Bad luck. Long run-down often lulls into false sense that bearings are OK, when really it's lack of lube drag, that's why the older grinders get the longer they run after switch-off.

[dodge at4]

nothing to do with the bearings , i replaced both about 1 year before and the grinder had bugger all use , i would imagine 1 hours continuous running of a electric motor that has little or no cooling to be the cause, unlike most electric motors used on say a drill presses , power saws ect these motors have a fan that circulates air through the motor to cool it
the gmf heavy duty grinder has no air openering , no fan and is a fully inclosed electric motor and i don't think new bearings would be the cause of it overheating
so i don't know the cause, any other ideas other than bearings as they were near new

[BaronJ]

Hi Guys,

Bearings (shielded ball race) have lubrication inside that tends to migrate to the lowest point and then over time congeal into a solid. Sometimes this can cause damage through lubrication failure, simply because there is no lubrication until the oil, grease or what ever has softened and been spread around inside.

I've got a number of brand new boxed bearings, some over twenty years old that are completely sized up for this reason. The trick I use to recover these bearings is to simply soak them in hot oil ! The heat softens the original lubrication and the oil usually penetrates into the bearing providing initial lubrication.

[lamestllama]

nothing to do with the bearings , i replaced both about 1 year before and the grinder had bugger all use , i would imagine 1 hours continuous running of a electric motor that has little or no cooling to be the cause, unlike most electric motors used on say a drill presses , power saws ect these motors have a fan that circulates air through the motor to cool it
the gmf heavy duty grinder has no air openering , no fan and is a fully inclosed electric motor and i don't think new bearings would be the cause of it overheating
so i don't know the cause, any other ideas other than bearings as they were near new

What does the nameplate on the grinder say? is it continuously rated? My GMF grinder is not.

[dodge at4]

hi all thought i would update my gmf grinder rewind, i called a company in knox victoria and for a quote over the phone it was $600 to rewind the motor
i then rang ringwood motor rewinds and was quoted $300 , so i dropped the grinder off there and picked if up a week later with a new start capacitor fitted
so i was very happy to get it repaired and i believe it was $300 well spent
i would recommend ringwood electric motor rewinds to any one wanting a motor repaired
now i can start sharpening my morse taper drills again thanks all