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Forum topic by bondogaposis posted 11-09-2018 09:35 PM 2500 views 0 times favorited 13 replies Add to Favorites Watch
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bondogaposis

5454 posts in 2772 days


11-09-2018 09:35 PM

Topic tags/keywords: question lathe

My lathe died today and I really need it. I’m thinking it is the capacitor on the motor. Where can you get capacitors?
Some photos of the motor and capacitor.

-- Bondo Gaposis


13 replies so far

View Kazooman's profile

Kazooman

1326 posts in 2373 days


#1 posted 11-09-2018 09:50 PM

Locally? Motor repair shop, well drilling place, air conditioning repair guy, etc. any place that works on repairing motor driven machinery.

On line – just Google.

Just match the capacitance and get the same or higher voltage. The size of the can will need to fit the cover on the motor. You can do a “get me back in business” repair with one that doesn’t fit the cover and order a proper size for swapping later. They are not that expensive.

You could even “borrow” one from another motor to keep you going.

You can check the capacitor with a multimeter to see if it is bad. Brad will stop by shortly to tell you how to do it.

Edit: I knew it! Nine minutes after my post and Brad posted a reply.

View RobHannon's profile

RobHannon

276 posts in 951 days


#2 posted 11-09-2018 09:53 PM

Never dealt with these folks, but the model number matches.

https://www.lintechcomponents.com/product/004183586/10027943/11349

Grainger also has a large listing of caps.
https://www.grainger.com/product/DAYTON-Round-Motor-Start-Capacitor-2MDT8 I think is the equivalent for that one.

Good luck with it.

View MrUnix's profile

MrUnix

7407 posts in 2620 days


#3 posted 11-09-2018 09:59 PM

The capacitor is pretty easy to test with a multi-meter in resistance mode to verify it’s bad. But, if it is your start cap – you can still use your lathe until a replacement is found… you will just have to manually give the motor a bump to start it up. The same symptom could also be caused by a faulty centrifugal switch however, typically because the contacts are not closing due to sawdust or other crud wedged in there.

What are your symptoms?

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View bondogaposis's profile

bondogaposis

5454 posts in 2772 days


#4 posted 11-10-2018 03:13 PM

Okay, the symptons yesterday was that when I turned it on after removing the belt nothing would happen. If I gave the pulleys a spin it would rotate maybe half a turn. It did hum a bit. This morning when I tried it, it started right up like all was okay.

-- Bondo Gaposis

View LesB's profile

LesB

2129 posts in 3864 days


#5 posted 11-10-2018 05:39 PM

Whether it is a faulty switch or the capacitor I think I would replace the capacitor anyway. They do gradually break down over time so if the lathe is a few years old or you use it a lot it won’t hurt to replace the capacitor.

-- Les B, Oregon

View TheFridge's profile

TheFridge

10858 posts in 1907 days


#6 posted 11-10-2018 07:25 PM

Sounds like the centrifugal switch got stuck open maybe.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View bondogaposis's profile

bondogaposis

5454 posts in 2772 days


#7 posted 11-10-2018 09:12 PM

Ok more problems, I took it apart and blew out some dust etc. Put it back together and it runs just fine without a load. When I put the belt back on it just hums quite loudly with no rotation. The lathe itself turns quite easily by hand when I take the belt off. Maybe I should just buy another motor.

-- Bondo Gaposis

View Kazooman's profile

Kazooman

1326 posts in 2373 days


#8 posted 11-10-2018 10:06 PM

Replace the cap.

View waho6o9's profile

waho6o9

8675 posts in 2998 days


#9 posted 11-10-2018 10:20 PM

BILLINGS Branch #064

221 Moore Lane
BILLINGS, MT 59101-3418

https://www.grainger.com/category/motors-motor-supplies-capacitors-and-accessories/ecatalog/N-19e9/Ntt-capacitors?sst=subset&ts_optout=true

Grainger should have either one ^

Best of luck!

View CaptainKlutz's profile

CaptainKlutz

1502 posts in 1915 days


#10 posted 11-10-2018 11:32 PM

If you want to try getting a motor capacitor or centrifugal switch locally, they can be usually be found at appliance parts or HVAC parts place. If you live away from big city, can also check with local farm supply store. Farmers use same size motors as our woodworking tools on pumps and hydraulic units, and the internal parts are common. :)

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

View splintergroup's profile

splintergroup

2730 posts in 1643 days


#11 posted 11-11-2018 03:04 PM

The start cap is what gives the motor the torque to start spinning under a load. Once up to speed, the centrifugal switch cuts the cap circuit out and the motor uses the “run” windings.

Either the cap is bad (or going bad) or the switch is stuck in the run winding position. Often a good blasting with compressed air can free up the switch without removing the motor cover. Caps are cheap.

View johnstoneb's profile

johnstoneb

3115 posts in 2593 days


#12 posted 11-11-2018 03:30 PM

Probably the capacitor. Should be able to find one in Missoula.

-- Bruce, Boise, ID

View MUST58GT's profile

MUST58GT

54 posts in 647 days


#13 posted 11-11-2018 03:39 PM

I just got my Jet 1/2 hp lathe motor back up and running recently so your circumstances are somewhat familiar. Fortunately you don’t need a PhD Electrical Engineering to do this (altho it might help). These small electric motors are relatively simple so root cause should be fairly easy to find.

0) The vest best option is to take the motor to an electric motor shop and ask for guidance. They know their stuff and should be able to help land this plane gently. Otherwise …

1) Do you smell any burning odors coming from the motor? If no, the windings are probably still good. If yes, suggest looking for a replacement motor (craigslist?) or talking with an electric motor shop nearby about rewinding the motor. That’s typically not cheap but it’s an option if you can’t find a less expensive replacement.

2) The capacitor is a more likely culprit. In addition to all of the other sources listed here, try Amazon if that’s more familiar. Caps aren’t hard to find and they’re cheap. Agree with other lumberjockers, try to match the size (uf) and voltage of the existing capacitor, especially given the selection of all these online sources. Remember to discharge the capacitor by shorting the leads with a screwdriver before you pull the wires.

The replacement cap may be larger than the OEM and may not fit inside the original cover. Don’t fret, just protect the leads with electrical tape, tie wrap the cap to the side of the motor and drop the original cover in a drawer in case you might need it, say … 25 years from now.

One more thing. There’s a difference between START and RUN capacitors. So, be sure to get the right one. Call the technical support line for your lathe (or motor) manufacturer to be sure.

I’ve been inside my lathe motor couple of times and very recently. If you have any questions, pls feel free to DM while it’s still fresh.

PS – What? No projects?

-- Richard, Austin TX - "Every repair job is really just an upgrade oppty in disguise!"

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