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Forum topic by jmalbright posted 04-13-2021 02:49 PM 212 views 0 times favorited 4 replies Add to Favorites Watch
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jmalbright

16 posts in 71 days


04-13-2021 02:49 PM

I just installed a grizzly v-helical head in my Shop Fox W1745 jointer and I’m getting an intermittent grinding/squealing noise when running under no load. Before I installed the helical head, the machine ran very quietly with the stock, straight-knife head.

I ran the motor by itself and it runs smoothly. However, when I turn the motor by hand, it makes a squealing noise, but I’m assuming that’s the motor brake. The jointer head rotates smoothly by hand with no noticeable noise, although it’s obviously rotating at a much slower speed than when the motor is actually rotating the head.

I installed a segmented belt and tensioned it according to the accompanying instructions. I thought the segmented belt might be the issue, but I’ve had the same result using the old standard v-belt.

I’ve aligned the pulleys the best I can. It is impossible to get them perfectly aligned based on the motor mount and shaft length, but it is very close and actually better aligned than when the old head was installed so I don’t think that is the issue.

The intermittent noise almost sounds like the motor brake when it kicks on, but I can’t confirm that’s the issue.

Any other ideas of what’s going on here?

Here’s a video showing the sound it makes:

https://youtu.be/rQHey1qZp28

Thanks for the help.


4 replies so far

View Aj2's profile

Aj2

3844 posts in 2883 days


#1 posted 04-13-2021 04:40 PM

I watched the video. If your asking about the hissing noise just before the motor stop my guess is the centrifugal switch.
The motor does sound noisy it may have been that way Since you have owned the machine. Straight knives do cover up a lot of sounds.
Good Luck how’s does it cut

-- Aj

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therealSteveN

7699 posts in 1659 days


#2 posted 04-13-2021 04:43 PM

I have this Griz 8” heli head jointer, and mine sounds just like that. I listened several times, and did not pick up anything else.

https://www.grizzly.com/products/grizzly-8-x-76-jointer-with-parallelogram-beds-and-spiral-cutterhead/g0490x

But I can’t say what I heard on the video as being intermittent, and definitely nothing like a squealing noise. Play the video with your eyes closed. If you can site a time mark on the video as when you hear an irregularity, that would help.

The heli heads are a different sound from straight knives. Most machines show them on a decibel meter as being much quieter. The overall harmonic is quite different though.

-- Think safe, be safe

View CaptainKlutz's profile

CaptainKlutz

4452 posts in 2579 days


#3 posted 04-13-2021 05:07 PM

I hear an intermittent screeching noise, or resonance inside machine.

TMK – Shopfox W1745 does not have motor brake?

Motor should make any noise when turned over by hand. Have you checked the centrifugal switch on back of motor? (Have to remove fan cover, and fan) Some of them have a ring that rubs on collar until motor is up to speed and switch is engaged. If not centrifugal switch rubbing noise, suspect you need motor bearing.

If you have intermittent bad bearings in motor, you can often place you hand on motor case and feel the change in resonance due dry bearings.

Another test is to remove the belt, and with leather glove or wooden stick, gently push on alternate sides of pulley with motor running. As bearing’s wear out, they often have more side to side movement. The noise could be only when the shaft is out of neutral position. Have seen this issue with blower motors where changing load of impeller pulling on the shaft, changes the noise so you only heard bearing noise during shutdown or start up.

Would also place my hand on various panels, or surfaces to see if can dampen the resonance while running. Just keep your hands away from blade/belt. Could have slight misalignment of bearing caps for the cutter head, or a loose bolt somewhere creating the noise?

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, Doom, despair, agony on me… - Albert King - Born Under a Bad Sign released 1967

View jmalbright's profile

jmalbright

16 posts in 71 days


#4 posted 04-13-2021 06:24 PM


how’s does it cut

- Aj2

It cuts great. I face and edge jointed some wenge and bloodwood scraps and it left beautiful surfaces.


I have this Griz 8” heli head jointer, and mine sounds just like that. I listened several times, and did not pick up anything else.

https://www.grizzly.com/products/grizzly-8-x-76-jointer-with-parallelogram-beds-and-spiral-cutterhead/g0490x

But I can’t say what I heard on the video as being intermittent, and definitely nothing like a squealing noise. Play the video with your eyes closed. If you can site a time mark on the video as when you hear an irregularity, that would help.

The heli heads are a different sound from straight knives. Most machines show them on a decibel meter as being much quieter. The overall harmonic is quite different though.

- therealSteveN

I’m really happy to hear that’s how your grizzly helical head sounds as well. This is my first experience with the helical head and I know they’re supposed to be much quieter than straight knives under load, but I didn’t know what to expect under no load.

As far as the intermittent noise, it is very noticeable starting at about the 14 second mark and ending at about 16 seconds.


I hear an intermittent screeching noise, or resonance inside machine.

TMK – Shopfox W1745 does not have motor brake?

Motor should make any noise when turned over by hand. Have you checked the centrifugal switch on back of motor? (Have to remove fan cover, and fan) Some of them have a ring that rubs on collar until motor is up to speed and switch is engaged. If not centrifugal switch rubbing noise, suspect you need motor bearing.

If you have intermittent bad bearings in motor, you can often place you hand on motor case and feel the change in resonance due dry bearings.

Another test is to remove the belt, and with leather glove or wooden stick, gently push on alternate sides of pulley with motor running. As bearing’s wear out, they often have more side to side movement. The noise could be only when the shaft is out of neutral position. Have seen this issue with blower motors where changing load of impeller pulling on the shaft, changes the noise so you only heard bearing noise during shutdown or start up.

Would also place my hand on various panels, or surfaces to see if can dampen the resonance while running. Just keep your hands away from blade/belt. Could have slight misalignment of bearing caps for the cutter head, or a loose bolt somewhere creating the noise?

Best Luck.

- CaptainKlutz

No, I have not checked the centrifugal switch. Exactly what would I be looking for?

I guess bad motor bearings or something else loose inside the machine is possible. I’ll take a look and see what I can find.

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