Thread: Noise in Worm Gear of Table Saw

Mal, how have you checked all this. Did you take the cast iron top off to look?

Lignum,
No I didn't take the top off.
I took the small front panel and timing gearoff, took the blade out, opened the rear door, removed the blade guard and put the machine in good sunlight and used a mirror. The tilt to 45 degree can be moved to gain better access.
I had my wife with her head in the back door at different times not with the motor running of course.
Very awkward but I think I get to see just about everything.
Must have dismantled and reassembled about 20 times.
Mal

I find it very hard to see inside it. In a month or so im going to take my top off and give it the mother of all clean ups.

If you want rid of the noise you will have to strip the lift screw gear, By altering the belt you altered the tension it took in the rise and fall. You might have luck with a can of CRC sprayed in the screw but the best method is to remove the mschanism and clean and lub the threads as there's sawdust compacted in the female part causing it to grate in the threads

Originally Posted by rrobor

If you want rid of the noise you will have to strip the lift screw gear, By altering the belt you altered the tension it took in the rise and fall. You might have luck with a can of CRC sprayed in the screw but the best method is to remove the mschanism and clean and lub the threads as there's sawdust compacted in the female part causing it to grate in the threads

yeah...but what I don't get is that when the blade is off the noise goes away

If when you turn the screw it makes a noise it must be the screw. Physics. When the blade is spinning the belt is pulled in the pulley. Now that let us say the top of the belt will be tighter than the bottom the portion of the belt out from the motor is slacker than the belt in. Now this proves that when the motor turns it creates 2 forces, the one you want to spin the blade and the other you dont want, to try to pull the blade into the motor, So if you try to adjust height there will be more weight on the screw when the blade spins and as you found out your screw still squeaks.

Enough of the suspense!

You must remove the table and strip the trunnion down to it's component parts in search of the culprit. It's an imperative!

Otherwise we can play this guessing game until they plonk us in boxes...

Well I'm out of guesses.
The rise and fall run smoothly enough and without the blade in place there is no noise.
Put the blade on even without tightening the nut and the noise reappears.
I'll guess I will have to strip it down but that is not going to happen in the forseeable future as I have a few other things on.
If I find a solution, I will post.
Mal

Originally Posted by Mal F

Well I'm out of guesses.

Mal, take Skews advise. Its all guess work unless you can see what you are doing. The top is easy (a little heavy) to take off.

Its not guesswork its pure Physics, look up any engineers formula book and you can get equations and the like. You want to prove it whack 3 in one oil on the screw and nut and move it up and down a few times then try it. Then all you have to do is wash the oil off and do the job correctly.
As an edit Please check from the 17th centuary Isaac Newtons law of motion. For every action there is an equal and opposite reaction. Noise is your reaction, ask yourself what action caused that.

Except that if it was the worm screw, then for every turn of the knob it'd make the same noise at the same position in the turn.

Not only make the noise after X amount of turns in one direction.

Originally Posted by rrobor

Its not guesswork its pure Physics,

So are you saying that you let loose an entire can of WD40 in areas you cannot see in the hope the offending part will doused?

I'm not familiar with your TS Mal but I think from what I read from all of this is that the mechanism operating the rise and fall of the blade height is similar in your TS and mine. Yes, I shot gun sprayed the perceived problem with WD40 in hope of fixing the problem too

Although I consider myself ignorant of machine mechanics and physics for that matter I'll usually give dismantling a machine a go if I think it fairly safe. I don't touch electronics which obviously can have more dire repercussions for the ignorant.

I cleared a space about 6' square in my shed (this took some effort) found an old bed sheet (watch this decision, male old and female old are different ) and laid it on the floor. I don't have a suite of spanners which would have been better but I dismantled mine with two allen keys, two shifters and a screw driver. I won't mention the cold chisel and mash hammer as that may scare you off . All the components were laid out in reverse order of dismantle on the sheet close to the machine. I had small containers for washers, screws, springs and other nic nacs.

It's probably best to dismantle and reassemble without much time in between while your memory is fresh in the method, I did have a couple of moments, might be best to take photos or make sketches to aid the memory.

After taking mine apart, cleaning and lubing it where getting on a lot better, I'm sure the machine liked me for it and has performed beautifully since, I was even tempted to give HER a name It's something once tried, you feel if you did it a couple more time you'd be able to do it with your eyes shut