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Forum topic by rebelson posted 12-02-2012 02:08 AM 743 views 0 times favorited 14 replies Add to Favorites Watch
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rebelson

24 posts in 833 days


12-02-2012 02:08 AM

Topic tags/keywords: tablesaw

Hello everyone, I purchased a used Unisaw 3 months ago and put it away in storage till I had space in my garage. I was finally able to bring it home yesterday and I noticed a clanking noise coming from the saw. It sounds just like the noise in this youtube video especially between the 0:08 and 0:14 mark:

http://www.youtube.com/watch?v=gVU0ur-nMCo

What’s odd is that if I was to lower the blade completely and apply pressure to the handle when it’s reached it’s lowest point the noise would get slightly louder. I used compressed air to blow out all the packed saw dust and lubricated the gears inside as best I could with WD-40. The noise is there no matter if the blade is tilted, lowered completely or raised to it’s peak. Can anyone help?


14 replies so far

View mrg's profile

mrg

521 posts in 1658 days


#1 posted 12-02-2012 02:28 AM

Take the blade off and see what it sounds like. It may be blade harmonics. How old is the saw? How are, the arbor bearings?

-- mrg

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Grandpa

3136 posts in 1334 days


#2 posted 12-02-2012 02:29 AM

Then take the belts off and see if the sound is in the motor, sheaves or belts

View rebelson's profile

rebelson

24 posts in 833 days


#3 posted 12-02-2012 02:43 AM

^^^ Any online tutorial on how to do this? I am a complete noob when it comes to taking machinery apart.

View Fred Hargis's profile

Fred Hargis

1796 posts in 1152 days


#4 posted 12-02-2012 12:44 PM

Take a look at this link and see if anything helps. These guys really know their stuff and may be of help.

-- Our village hasn't lost it's idiot, we sent 'em to Washington.

View Lee Barker's profile

Lee Barker

2165 posts in 1509 days


#5 posted 12-02-2012 02:07 PM

I’d check for loose sheaves (pulleys).

Kindly,

Lee

-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View Dan Krager's profile

Dan Krager

1570 posts in 892 days


#6 posted 12-02-2012 03:32 PM

Sounds like a bad set of arbor bearings. To check:
1. unplug the power.
2. remove the blade
3. remove the belts to motor
4. spin the arbor by hand slowly and feel for roughness.
5. spin the arbor as quickly as you can and watch to see how quickly it stops.

If there is any roughness or resistance to turning, replace the two bearings at a cost of about $18 apiece from NAPA or any store selling bearings. These are sealed bearings and require no maintenance, only replacement.
It’s a great saw, easy to maintain if you keep the dust out of it. Use a dry lubricant like graphite on the exposed trunnions, gears, and shaft.
DanK

-- Dan Krager, Olney IL http://www.kragerwoodworking.weebly.com

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rebelson

24 posts in 833 days


#7 posted 12-03-2012 04:36 AM

Update.

I removed the arbor and the bearings make a light noise when spun by hand. They move freely, but don’t spin for long. While I have the top off I am going to replace the belts and replace the arbor bearings. I did run the motor to rule it out as the culprit but when its almost at a complete stop it makes the same noise as heard in this youtube video. Not as loud (I think) it its the same. The sheave on the motor has no play in it.

https://www.youtube.com/watch?v=mBHGQcPwvQo&feature=youtube_gdata_player

Is this something serious?

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rebelson

24 posts in 833 days


#8 posted 12-03-2012 04:42 AM

Update.

I removed the arbor and the bearings make a light noise when spun by hand. They move freely, but don’t spin for long. While I have the top off I am going to replace the belts and replace the arbor bearings. I did run the motor to rulr it out as the culprit but when its almost at a complete stop it makes the same noise as heard in this toutube video. Not as loud (I think) it its the same. The sheave on the motor has no play in it.

https://www.youtube.com/watch?v=mBHGQcPwvQo&feature=youtube_gdata_player

Is this something serious?

View exelectrician's profile

exelectrician

1574 posts in 1086 days


#9 posted 12-03-2012 04:52 AM

Your motor has a centrifugal switch inside which switches the starting windings on to start and when the motor gets up to speed it switched these windings off. The motor runs on one set of windings. When you switch the motor off it slows down to about 200 RPM then the centrifugal switch resets it self with an audible click, also the actuator arms rub gently on the actuator making a noise. All of the above is perfectly normal.

-- Love thy neighbour as thyself

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rebelson

24 posts in 833 days


#10 posted 12-03-2012 04:57 AM

Thank you VERY much, exelectrician. Good to know that its a normal noise.

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exelectrician

1574 posts in 1086 days


#11 posted 12-03-2012 05:07 AM

You are welcome.

-- Love thy neighbour as thyself

View MedicKen's profile

MedicKen

1599 posts in 2120 days


#12 posted 12-03-2012 05:32 AM

Sounds like dry bearings to me. How old is the saw? Useable or shelf life of sealed bearings is about 20 yrs. If the saw has been sitting for any length of time, especially in a hot environment the grease will harden.

http://wiki.vintagemachinery.org/Unisaw%20Disassembly.ashx

http://wiki.vintagemachinery.org/How%20to%20Properly%20Clean%20a%20Unisaw.ashx

The unisaw has not changed since 1939. Unless this is a brand new saw with the new design the above info will still be current

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

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rebelson

24 posts in 833 days


#13 posted 12-03-2012 05:41 AM

The saw was built in the mid 80’s. Im just going to replace the arbor bearings and get it over with. In my opinion its only a matter of time till they go out anyway. I purchased this saw from a seller in new jersey .

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MedicKen

1599 posts in 2120 days


#14 posted 12-03-2012 02:52 PM

Unless the motor has recently been worked on, I would replace the bearings as well. Not a big deal to do. The motor is not the easiest to remove and you will have it out to do the arbor bearings, so it will be the perfect time.

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

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