2x72 grizzly stopped working

PaulDiStefano

PaulDiStefano

Joined
Nov 14, 2016
Messages
636
Hey everyone, my belt grinder stopped working today and I have no idea why. I don't know anything about tools with motors so I'll describe it I guess.
In the past I used a 1000 grit belt one time. It ran for a little and then just stopped. The grinder is really really staticky and shocks the crap out of me all the time. When I used this belt I think it was some sort of static surge problem because it flipped the circuit breaker. So I flipped it back and stopped using the belt and it was fine after. Then randomly about 2 or 3 times last month it flipped it and it stopped running so I just flipped it back and it worked. Today I was using it. Was grinding on a blade for about 5
Minutes and it just stopped working. This time the circuit breaker switch didn't flip. It just stopped. Idk what happened or why it died?
Can someone help me who knows how these tools work. I have zero knowledge of the parts inside and how they work. Thanks guys
 
Get your hands on a tester/meter and check the receptacle you plug into. You may have burned out the breaker. Plug the grinder into a different circuit to test it. What amp circuit are you using... standard 15A or 20A? The grizzly pulls a lot of amps upon start, which would be hard on a breaker.
 
It would help to know what model Grizzly it is. What amperage & voltage circuit its plugged into.
Had you plugged into another known live circuit ?
Anyway, It sounds like its supply circuit is too small (supplied on 15A circuit rather than 20A for example) Possible its circuitbreaker is faulty now also. Whats not uncommon for circuits what are regularly overloaded.
 
It sounds like maybe something overheated. Overheating could possibly damage the inside windings causing a short or overcurrent. Does the motor spin freely without a belt on the machine or is it sticky or stiff? If you flip the switch and give the wheel a good spin by hand in the correct direction, does it start or run? Have you plugged something else into the outlet to make sure it isn’t a problem with the plug or cord? Could be metal dust in the outlet causing a short and not the grinder itself.
 
After making sure you have electric in the outlet as stated above the next thing I'd do is bypass the switch you turn it on and off with. Remember to unplug the grinder, remove the switch and either check the switch with a Ohm meter (should have continuity with the switch on) or temporarily wire the two wires coming to it together. A jumper with alligator clips is the handiest way to bypass the switch temporarily Then plug in and see if the grinder runs.
 
I plugged the grinder into different outlets and it doesn't work. But anything else like drill presses and fans/lights work in the outlet the 2x72 was in. I believe it's 20A because there's a 20 on the switch. The grinder doesn't turn on at all. I pull the on switch and it makes no noise at all. It's a 120vac
 
Ok.
Next is you will need to open the machine and diagnose.
Absent a voltmeter & minor electrical understanding, easiest you can do is bypass its on-off switch & plug it in.
If that fails to work, you might have to resign to enlist compentent help.
 
Lieblad said:
Ok.
Next is you will need to open the machine and diagnose.
Absent a voltmeter & minor electrical understanding, easiest you can do is bypass its on-off switch & plug it in.
If that fails to work, you might have to resign to enlist compentent help.
Click to expand...
Ok I guess that's the project for tomorrow. I'll be sure to post pics of the inside if I see anything that looks out of the ordinary.
Thanks guys
 
My grizzly sander shocks the crap out of me sometimes.

If you stall the motor a lot it can overheat. When the motor is spinning there is a back EMF that prevents too much current flowing through the windings, and if the motor stalls then that back EMF disappears and it can warm up very very quickly. When motors burn up there is usually smoke and funny smells.

I bet vibration has shaken some wiring loose. Bypassing the switch is a good idea but any connections should be checked.
 
OK, how do ya'll know this is a Grizzly grinder? I've read the OP several times carefully and didn't see that. Is it the G1015 Grizzly grinder? That's a 1hp at 14 amp rating. That "could" have burnt a 20 amp breaker out. You've plugged into different 120vac recepts, but are you sure they are on a different circuit? Is this a GFI breaker?

Oh, the static shocks you're getting can be taken care of by using a static mat to stand on with the wire clipped to grinder frame. To test this, take a bare copper wire connected to the grinder frame (good electrical connection required) and stand on the other end with bare foot to see if static charge goes away. Anything to keep you at the same electrical potential as the grinder.

THIS IS ASSUMING THE GRINDER FRAME IS SAFELY GROUNDED!
 
His title says Grizzly! Mine is 120v ac. single speed with a simple pull push start switch. It's a totally enclosed motor and although I'm not sure I've never looked under the base mounting there are no capacitors. He says he has plugged other devices into the recep his grizzly was plugged into and the other tools all work in the same recp his grinder was plugged into. So with that all said again I'd bypass the switch and try that.
 
Ken H> said:
OK, how do ya'll know this is a Grizzly grinder? I've read the OP several times carefully and didn't see that. Is it the G1015 Grizzly grinder? That's a 1hp at 14 amp rating. That "could" have burnt a 20 amp breaker out. You've plugged into different 120vac recepts, but are you sure they are on a different circuit? Is this a GFI breaker?

Oh, the static shocks you're getting can be taken care of by using a static mat to stand on with the wire clipped to grinder frame. To test this, take a bare copper wire connected to the grinder frame (good electrical connection required) and stand on the other end with bare foot to see if static charge goes away. Anything to keep you at the same electrical potential as the grinder.

THIS IS ASSUMING THE GRINDER FRAME IS SAFELY GROUNDED!
Click to expand...
The title says 2 x 72 Grizzly.
He checked the receptacle and it works for other equipment.
 
LCoop said:
His title says Grizzly! Mine is 120v ac. single speed with a simple pull push start switch. It's a totally enclosed motor and although I'm not sure I've never looked under the base mounting there are no capacitors. He says he has plugged other devices into the recep his grizzly was plugged into and the other tools all work in the same recp his grinder was plugged into. So with that all said again I'd bypass the switch and try that.
Click to expand...
It has a capacitor that assists upon start.
2v2Jca2dUxAhgEC.png
 
Rick is right about the capacitor. That’s why I suggested seeing if it started with the switch on by giving the wheel a hard spin. Could be a blown start cap. We have tested other motors this way and the odd time they will fire if you get them rolling. Not always though.
 
Grayzer86 said:
Rick is right about the capacitor. That’s why I suggested seeing if it started with the switch on by giving the wheel a hard spin.
Click to expand...
This is a good point and thing to try. Usually if a capacitor is bad, a motor will at least hum and maybe it ’tries’ to run. At least then you know its not a power supply problem & switch is OK and most likely its capacitor faulty.
 
Ok so I just unscrewed the on off switch
And there's 4 wires connected to it. One of them looks like something burnt or melted inside I'm not sure. Here's the pic
IMG_1692.JPG
 
from here i'm unsure of how to bypass this switch. I hope this picture helps.
I guess after we test bypassing it Ill check the capacitor

Oh and it didnt start from a hard spin
 
Dummy me - at least learn to read subject of a post!

as mentioned if the capacitor is bad the motor will hum - you can give it a spin by hand and motor will normally start then. I've had 1 ph capacitor start motors that won't start, give them a spin and start right up. Dad had a drill press he never fooled with changing capacitor on, just gave it a spin for years.
 
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