Just being on the safe side !!!!!

user-172496 | Posted in Power Tools and Machinery on February 9, 2008 05:56am

Hello All !!!! I posted this on another forum at the start of the week, but never did get a response. So I thought I would try here.

I have a Jet jj-6C SX 6in. jointer, I have had it for a few years now and am very happy with it. The other day I changed the blades on it and ever since it has a funny sound to it, like a knocking to it or ping ever once in a while.

I checked the manual and it say’s the belt should have a play to it, so it needed to be tightened. The only to do that is to loosen the bolts and move the motor down. But how in the @#%^*&%$ blank does one do that with so little room. Does anyone have any ideas.

Thanks Jack

Replies

KeithNewton | Feb 09, 2008 06:36am | #1
I am not sure that I follow all of your message, but if you didn't change the belt settings, I would not suspect it now.

If you set the blades higher, this will fan more air, and be louder. If it is closer to the infeed table, this even adds a louder slap to the air noise, as each air pulse gets sheared off.

If the blades are not in balance, this will induce vibration, which might make something rattle. You might take a rubber mallet and give it a good thump down on the ends then side-ways on the ends , and even up, to try to replicate the ping / rattle.

Remove the belt, and spin the shaft by hand, and run the motor without the belt on.

Make sure that you got all of the nuts tight.

The process of elimination is the best way to find problems.
JohnWW | Feb 09, 2008 07:53pm | #2
Jack,

I agree with the first poster, if the sound first appeared after the blades were changed, I'd be looking at the blade and head as a source for the sound.

All of the smaller jointers coming from Asia have terrible motor mounts, they were designed to be cheap not practical. The easiest solution is to get a link belt to replace the conventional belt.

The way to install the link belt is to move the motor to the top of the slots and bolt it down, this should get the motor level automatically. You could also drop the motor to the bottom of the motor mounting slots, but this will mean you will use up more of the link belt and the longer belt may slap against the belt cover.

Now, if needed, move the motor pulley a bit to get the two pulleys in line. If there is a major misalignment you may have to loosen the motor, and move it front to back, to get the basic alignment and then fine tune by moving the pulley on the motor's shaft. Now just install the linked belt according to the installation instructions that come with it.

If you want to keep using the belt you have, putting a small auto scissors' jack under the motor to get it in position will make a near impossible job slightly easier.

John White

Edited 2/9/2008 12:04 pm ET by JohnWW