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Thread: Electric Motor fail
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21st October 2014, 08:18 PM #16.
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I like Rays summary and agree the wow-wow sound is a strong sign the run coil is gone.
I notice you tried to start it "by spinning the wheel".
Just in case, try removing the wheel and rotating the shaft, as the wheel itself may represent too high a starting torque for a manual type start.
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21st October 2014 08:18 PM # ADSGoogle Adsense Advertisement
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21st October 2014, 08:45 PM #17Novice
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By some unlikely coincidence both my lathe and compressor died with similar symptoms on Sunday.
Compressor would start slowly and stall once pressure started to build up.
Lathe would spin up very slowly and maybe come up to full speed eventually.
Compressor is definitely the run cap, it's spilled it's guts.
I suspect the the lathe is the same but I have to pull it away from a wall to get at the cap.
Anybody know what the cap specs are for an AL320G ?
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22nd October 2014, 01:42 AM #18
A few years back my chop saw developed that symptom and just stood and hummed without spinning up !
Now its one of those motors without a centrifugal switch, the capacitor is permanently in circuit. Getting a new cap was no problem at all. But it didn't fix the problem.
At the time there was a motor rewind shop just down the road and I took the motor there. The following day the guy who I went to see, phoned and said to come and pick the motor up. It turned out that the run winding had a break in the wire to the terminal block and only the fabric of the insulation was holding the wire in place. The conclusion was that mechanical fatigue due to vibration during use had caused the wire to part company with the brass ring that secured it to the terminal.
So its worth having a very close look at any wires that are effectively unsupported.Best Regards:
BaronJ.
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23rd October 2014, 06:54 AM #19
Second post in this thread will answer your question.
https://www.woodworkforums.com/f65/hafco-all330-al-335-al-336-2-hp-motor-cap-188669
MattWarning Disclaimer
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23rd October 2014, 07:54 PM #20Novice
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All sorted now.
I popped into Hare and Forbes yesterday, they didn't have caps on the shelf but they couriered me a set to me today.
Original
Start cap 250 VAC 50-60Hz 100uF
Run cap 450VAC 50-60 Hz 25uF
Replacement values are a little different, but I got the feeling that they sell of lot of this combination.
Start cap 125 VAC 50-60Hz 108-130uF
Run cap 450VAC 50-60 Hz 20uF
New 65uF run cap fixed the compressor too.
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24th October 2014, 12:00 AM #21
Crikey! Don't expect the starting cap to last long! At a 125V rating and getting belted with 240V every time you start the machine, it will probably pop it's top in just a few starts..... send it back and get at least a 240V one.
Cheers,
Joe
9"thicknesser/planer, 12" bench saw, 2Hp Dusty, 5/8" Drill press, 10" Makita drop saw, 2Hp Makita outer, the usual power tools and carpentry hand tools...
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24th October 2014, 06:32 AM #22
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24th October 2014, 06:35 AM #23Novice
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24th October 2014, 06:03 PM #24Senior Member
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http://au.rs-online.com/web/p/alumin...itors/0117215/
should not be an issue tho, any motor winder will probably have them in stock
Regards
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