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Thread: Linisher overheating
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19th January 2016, 12:39 PM #1
Linisher overheating
So this old linisher goes well most of the time, but cuts out (or rather throws the safety switch at the power board) when the motor gets too warm - I wouldn't call it hot. After about 15 minutes work. Even I can work for longer than that in one stretch. Is that just age, or faulty wiring (?), or can i repair/replace something to give me a bit more working time? Any advice much appreciated.
EDIT: Mmm, motors cooled down now but still throwing switch. So electrics is the issue...?
DSCN0451.jpgDSCN0452.jpgRusty
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19th January 2016 12:39 PM # ADSGoogle Adsense Advertisement
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19th January 2016, 05:50 PM #2GOLD MEMBER
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Ive got one of those big boy type linishers. A lot newer than yours by the look of it but made in the same country. Have had the motor re-wound 3 times. Maybe electric motors are not the Taiwanese's forte'.
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19th January 2016, 06:36 PM #3.
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The first thing I would do is check out if the coils are shorting internally or to earth.
Naturally you do this with the power off and machine unplugged
A 1HP motor should have some 10's of Ohms resistance across the coils so if the meter measures the coils to be a few ohms
Or
There is a short or low resistance between the coil and earth
Then the motor coils have been overheated and cooked the insulation off and will need a rewind
Those sanders based on what is totally enclosed fanless grinder style motors certainly don't like working too hard for too long and will eventually die from overheating.
The 1HP is also too lightweight for that width of belt and size of disc.
I have a similar size (belt and disc) but mine has a 3HP 3Phase motor with a serious external fan on it.
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19th January 2016, 09:24 PM #4
Bob, I wouldn't even know where to look for the coils or what they were if I saw them. And I don't have anything to measure Ohm resistance. Point taken about the size of the motor, it does have a fair bit of work to do.
Evanism(?), yes everything is spinning freely so I don't think bearings are shot.
Looks like comparable machines are $1000 plus new so i guess it's worth getting a repair quote; just hope I don't need three rewinds like yourself ABodger.Rusty
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19th January 2016, 09:32 PM #5Retired
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I deleted my post because it was stupid. If you had tough bearings that were hard to spin, then of course you would have noticed it.
On reflection, what BobL says makes a lot of sense. If a motor works hard then it melts the goopy on the windings and this causes problems. I've seen this before and there isn't much for it other than a replace or rewind.
We seem lucky here in Canberra. There are a couple of places that still do it. But the way things are going, it's getting a more throw-away society every day I had the starter motor on the HSV die the other week (click click click!) and the biz just sold me a new one, told me to toss the old. What a heinous waste!
There is nothing worse that a misbehaving machine. Especially one as necessary as a linisher! (love mine! Shame it's not one of the big long ones!)
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19th January 2016, 09:46 PM #6
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19th January 2016, 10:09 PM #7Retired
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If you pull all the crap off and send just the motor Id reckon it would be OK. Send it via courier (e-go.com.au) and it will only be ~$10 there and the same back. Don't be dragging it around, let the courier do the work.
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19th January 2016, 10:35 PM #8.
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20th January 2016, 01:41 PM #9rrich Guest
Because you blokes have double the normal voltage we have here, my suggestion may not be relevant.
Open up the motor shell and clean everything. Sitting here on the wrong side of the International date line, my guess is that the centrifugal starting switch is not dropping out after the motor gets up to speed. If these switches are not dropping out, the starting coils are not dropping out. This has a tendency to cause the motor to overheat.
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