I have 8" G0858 jointer that is about 1 1/2 years old. On start up, it has a loud screech/grind type noise that last about 1 second and goes away. The noise lessens on start up, if I use it repeatedly over a few minutes, but does not completely go away. It is not a whistle type noise which I would associate with loose belts. I have checked the belts and they seem tight. Otherwise this machine works great. As I am a hobbyist, it is not everyday that I use it, thus it had been tolerated. Any idea what this may be? As it goes away completely once running, I have not worried about it.
Noisy Grizzley jointer
- Thread starter joec
- Start date
Check and see if the motor cooling fan is slipping on the armature shaft.
Remove 3/4 screws from motor cover and see if fan will spin without the armature turning. This happened to a friends 8" Grizzly.
Check that the belt pulleys are tight on both the motor and arbor. I have had mine work loose that caused noise from the loose pulleys and the subsequent belt misalignment. I think the Grizzly jointers also have some type of harmonic vibration in the cutter heads that happens at an RPM between 0 and full speed. My jointer will make noise when I turn it off. The noise starts at a certain rpm as it slows down, then after it slows further the noise/vibration stops. It is pretty consistent on shut down.
The noise you hear at shutdown is electronics slowing down the RPM's.
I have several machines that do the same. Basically an electronic brake.
I know what you are talking about, but the noise that I have is not that. It is definitely a mechanical vibration.
Take the drive belt off and run the motor to see if the noise still exists.
Turn the cutterhead by hand and see if you can feel anything. Check both pullies to see if they are tight on the shafts.
All the above, but also crap belts. Get a Gates AX series or one from D&D power. Much smoother running. Chinese belts are not consistent in cross section, bumpy splices, and not that great grip.
Use a strait edge to be sure the sheaves are in the same plane, both position and tilt. Belts are infamous for the kind of harmonics Brad mentions. If you watch the belt, you can usually see it in action. Not unique to Griz. ( especially when you consider it looks like there are only two OEMs for jointers)
Not sure about any electronic brake. Easy on a 3 phase or universal motor, but not on a single phase induction motor. For that kind it is very expensive requiring an additional power supply and control box.
Use a strait edge to be sure the sheaves are in the same plane, both position and tilt. Belts are infamous for the kind of harmonics Brad mentions. If you watch the belt, you can usually see it in action. Not unique to Griz. ( especially when you consider it looks like there are only two OEMs for jointers)
Not sure about any electronic brake. Easy on a 3 phase or universal motor, but not on a single phase induction motor. For that kind it is very expensive requiring an additional power supply and control box.
I didn't say it was an electronic brake. I said it was "Basically an electronic brake". Maybe I should have stated it differently. Come to my shop and I will show you how they work on my 12" jointer and 20" disc sander.
Sure, always up for a field trip.
Those sound more in the industrial size machines. Maybe something clever in there. I would love to configure some hack other than the foot brake on my BS and one of the biggest causes of table saw injuries is impatience waiting for the blade to stop. Some very gentle, non-jerking ( so not to spin off the blade) would be a big improvement even if it only cut the time in half. Universal motors you only have to short the windings and they back EMF brake. You can pull a similar trick on a 3 phase. New fangled DVR motors I would imagine can be braked as they usually even have reversing capability.
Charlie has helped me on several occasions with various pieces of shop equipment including a couple of times on my Grizzly jointer. Once it was a loose cooling fan coupling, which made a terrible noise, and at another time the centrifugal switch. I am not much of a mechanic, but with the help of some people on this site, I am better than I was.
I have serviced numerous Grizzly jointers with pulleys that loosened under use, it's a common issue with them. Good suggestion.
