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Diagnosing problem with shaper table

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Forum topic by SweetTea posted 01-06-2017 10:28 AM 884 views 0 times favorited 16 replies Add to Favorites Watch
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SweetTea

126 posts in 263 days


01-06-2017 10:28 AM

Ok guys, I need some help diagnosing a problem with my Harbor Freight shaper table. I use it solely for cutting rails on cabinet doors. I have two additional shapers made by Grizzly that I use for milling stiles and panels.

Anyway, my Harbor Freight shaper is messing up. When I run a rail through the cutters it bogs down the motor and it will loose the ability to finish the cut on the rail. It bogs down so much that eventually the cutter will stop cutting about mid way through the cut.

This shaper has been well cared for, and I have tried cleaning out the motor. It worked fine for two years. Any advice on possible methods of diagnosing and fixing this problem would be great.


16 replies so far

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SweetTea

126 posts in 263 days


#1 posted 01-07-2017 10:56 AM

Anyone? I think that I will pull the motor off next week and take it to an electric motor shop. The closest one is a two hour drive, unfortunately. I am somewhat handy with regards to working on things such as cars, and electronics so I was hoping to get some advice on things that I could check myself before making the 4 hour round trip to the electric motor shop. Any advice would be greatly appreciated.

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MrUnix

5080 posts in 1802 days


#2 posted 01-07-2017 11:08 AM

First thing I would check is to make sure the belt isn’t slipping. If that’s good, then take the belt off and try spinning the arbor and motor by hand to see how hard/easy they spin. Don’t know what kind of motor is in there, so take a picture or two.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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dhazelton

2507 posts in 1900 days


#3 posted 01-07-2017 01:14 PM

Is it a universal motor in there or a replaceable unit? My guess is that the motor is just made with thin gauge wire for the windings and cord and is getting toasty which leads to more resistance which leads to more heat and so on. If it’s a motor with a common frame type you can replace I’d start looking for one.

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wichman3

39 posts in 224 days


#4 posted 01-07-2017 04:12 PM

Ditto on the belt slipping, then check
Motor brushes for fouling; the armature should be bright and shiney.
If you can check the brushes, check for glazing/’wear.
Check the wiring for oxidation; if a coper wire is overloaded for too long it will oxidize and not be able to carry enough current. Oxidized wire will be very stiff when compared to the rest of the wire, check the power cord and the wiring to the motor.

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runswithscissors

2371 posts in 1628 days


#5 posted 01-09-2017 09:02 AM

Make sure the cutter isn’t spinning on the spindle.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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SweetTea

126 posts in 263 days


#6 posted 01-09-2017 11:07 AM

I took the cover off the motor, and the belt doesn’t appear to be slipping. The cutters and motor really seem to bog down if I am pressing down on the stock as I push it through.

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dhazelton

2507 posts in 1900 days


#7 posted 01-09-2017 12:58 PM

Dumb question, but does it do it with a new sharp bit?

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SweetTea

126 posts in 263 days


#8 posted 01-09-2017 01:00 PM



First thing I would check is to make sure the belt isn t slipping. If that s good, then take the belt off and try spinning the arbor and motor by hand to see how hard/easy they spin. Don t know what kind of motor is in there, so take a picture or two.

Cheers,
Brad

- MrUnix

I checked and the belt isn’t slipping, that I can tell anyway. I checked the arbor/spindle by hand and its tight with no wobble and spins freely.

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SweetTea

126 posts in 263 days


#9 posted 01-09-2017 01:01 PM



Make sure the cutter isn t spinning on the spindle.

- runswithscissors

It’s not

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SweetTea

126 posts in 263 days


#10 posted 01-09-2017 01:03 PM



Ditto on the belt slipping, then check
Motor brushes for fouling; the armature should be bright and shiney.
If you can check the brushes, check for glazing/ wear.
Check the wiring for oxidation; if a coper wire is overloaded for too long it will oxidize and not be able to carry enough current. Oxidized wire will be very stiff when compared to the rest of the wire, check the power cord and the wiring to the motor.

- wichman3

The wiring that I can get to without having to disassemble the motor is good. I don’t see any signs of wear that I can tell. Where would the brushes be located on this machine?

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MrUnix

5080 posts in 1802 days


#11 posted 01-09-2017 05:45 PM

Need to know what kind of motor you have. I doubt it’s a brush type motor, but it might be… although the current one on the web site states a 1HP 3450 rpm motor, which indicates it’s an induction motor. Need to know if it has a run capacitor, which could cause the symptoms you describe if it’s on it’s way out.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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runswithscissors

2371 posts in 1628 days


#12 posted 01-09-2017 07:37 PM

If it’s an induction motor, which it probably is, there will not be any brushes. Capacitors are usually in an external cylinder shaped thingy. They are easy to remove, and cheap to replace. Any motor shop can quickly check them for you.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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MrUnix

5080 posts in 1802 days


#13 posted 01-09-2017 07:46 PM

Really no need to take it to a motor shop – capacitors can be tested with any cheap multimeter… even those freebie ones from HF.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View SweetTea's profile

SweetTea

126 posts in 263 days


#14 posted 01-10-2017 11:23 AM



Need to know what kind of motor you have. I doubt it s a brush type motor, but it might be… although the current one on the web site states a 1HP 3450 rpm motor, which indicates it s an induction motor. Need to know if it has a run capacitor, which could cause the symptoms you describe if it s on it s way out.

Cheers,
Brad

- MrUnix

You are correct, it is an induction motor, no brushes. It does have a compacter on the side in a separate pod. Would that cause it to bog down when running stock through it if the compacter was going out?

View bruc101's profile

bruc101

1147 posts in 3145 days


#15 posted 01-10-2017 11:56 AM



Need to know what kind of motor you have. I doubt it s a brush type motor, but it might be… although the current one on the web site states a 1HP 3450 rpm motor, which indicates it s an induction motor. Need to know if it has a run capacitor, which could cause the symptoms you describe if it s on it s way out.

Cheers,
Brad

- MrUnix

Anytime we’ve had problems with a machine running a new capacitor fixed the problem.

-- Bruce Free Plans http://plans.sawmillvalley.org

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