WM CBN sharpener overheating

geraldhale · February 14, 2014, 03:33:37 PM

I bought a new CBN sharpener all most four years ago but never used it but with the cold weather we have been having we set it up and started to use it a little just to touch up blades to run on our resaw but we didnt sharpen more than three or four and the breaker on the control assembly started triping? and no we dont take much off when we run it, it's just makes a very small grind, the motor is not hot to the touch? has anyone else had this issue? I did a serch and did'nt see any other post on this topic? I wonder if I just got a weak circuit breaker but like I said this is basically a brand new machine its just been sitting in my store room in the box it came in the last few years????

Chuck White · February 14, 2014, 04:57:17 PM

Gerald, I think I'd just call Wood-Mizer.

Just doesn't sound good to me, regardless of how long it has been in storage!

losttheplot · February 14, 2014, 05:21:56 PM

Hi,

If your using an extension cord it might be too much resistance, also if you already have something using the same circuit the total might be more than the breaker can handle.

Hope you get it figured out.

Peter Drouin · February 14, 2014, 06:14:16 PM

In the summer it happen to me all the time, And I grind a little on the heavy side :D :D
I use an air hose, use a screw driver and open the face, on the side, [just a little] you see where it comes together and when I'm 1/2 way around a blade I blow air into it and that cools the braker. [Maybe for 20 seconds] It works find In the winter I don't need air unless I make it to worm with the heat on. ;D

bandmiller2 · February 14, 2014, 08:26:47 PM

Sounds like you may have low voltage, I'd check it with an accurate meter. Frank C.

Peter Drouin · February 14, 2014, 08:47:12 PM

I have mine plugged in the wall 12-2 copper wire in the box. Should have 110 there. :D :D

Bibbyman · February 14, 2014, 10:19:12 PM

You may be grinding too much. They say .045 will sharpen in one pass. .055 will require two passes. I sharpen .045 and will take a double pass on a dull blade.

If you think you're not grinding too heavy, try getting a new breaker. Our unit was doing the same thing and a new breaker fixed it. You maybe can get one at Radio Shack or some supply place. For sure Wood-Mizer has them.

NMFP · February 14, 2014, 10:27:04 PM

There is definitely something wrong as any of the wm sharpeners should not be doing that.

You mentioned that you are doing it now, especially in the cold. What are you doing to heat the oil so that it flows well?

terrifictimbersllc · February 14, 2014, 11:26:12 PM

I have the WM shop series CBN grinder and it is very easy to trip the motor's breaker by grinding too heavy. It's too heavy if you can't hear the double grind sound. As you probably know the cam is shaped to let the grinder touch down twice during the grind of each tooth. Makes a "chee-chee" sound, unless it's too heavy of a grind then it starts to sound just like one grind. This will trip the breaker before the blade is 1/3 to 1/2 done. Answer is to not grind so heavy. The motor ought to be more powerful.

woodyone.john · February 15, 2014, 03:14:37 AM

I had this problem too, in warm or hot weather I couldn't sharpen a complete band sharpening lightly. Because I only want to sharpen in the shed -ac power, I replaced the dc motor with a bigger ac one and bypassed the cutout. Had no problems since . Overkill perhaps but I can now count on the sharpener.

Bibbyman · February 15, 2014, 05:03:50 AM

Quote from: woodyone.john on February 15, 2014, 03:14:37 AM
I had this problem too, in warm or hot weather I couldn't sharpen a complete band sharpening lightly. Because I only want to sharpen in the shed -ac power, I replaced the dc motor with a bigger ac one and bypassed the cutout. Had no problems since . Overkill perhaps but I can now count on the sharpener.

Did you find a direct bolt on replacement motor? I searched for one in catalogs but never was sure I found a match. Do you have the brand and model# handy?

NMFP · February 15, 2014, 07:09:39 AM

A friend of mine asked me about the same thing last year and I couldn't locate anything that was direct bolt on. Please share the information if you can.

pineywoods · February 15, 2014, 12:18:56 PM

I see the same problem with the old wm drag type sharpener. Usually from grinding too aggressively, but sometimes when the rock hits a bent tooth. Those motors are 12 volt dc. Typically, small amperage breakers aren't very precise. A 5 amp breaker may trip at 4 amps and another just like it may trip at 7. On my to-do list is a changeout to a 1/4 hp 110 volt motor. If you go that route, make sure the new motor is 3600 rpm or close to that. AC motors will be either 1750/1800 or 3450/3600.

woodyone.john · February 16, 2014, 03:30:25 AM

I am lucky enough to have a local die maker [I want to be best friends] who modified both the cbn wheel attachment and 'clocked' the attachment point. it was any old motor to me [just cheap] but it works well. my greatest concern was that the weight would upset the grind angle but that doesn't seem to be the case. I've just created a gallery dedicated to my sharpener mods ,and you sir where the inspiration. thanks for all your input. I have learned heaps from your posts esp mill mods cheers john

geraldhale · February 18, 2014, 09:38:10 AM

Wow thanks for all the replies, Chuck I called wood mizer who normally gives a lot of dirrection when I call but on this one they just said start with changing the breaker and that was about it? so Im happy to hear Bibbyman say he changed his and it solved the problem. As for my sharpener its pluged stright into the wall, no cords, its a heated room so the oil is warm and we dont grind all that heavy, I mainly use a new blade or resharp by wood mizer on my mill intill its not cutting all that well then I use them on my Baker resaw so we just want to touch up the blades a little, Im not trying to get them as good as new or as good as they come back from the resharp program so I know Im not grinding heavy.