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Strange vibration from Jet 6 x 48 oscillating belt sander

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Forum topic by Lee Barker posted 364 days ago 472 views 0 times favorited 4 replies Add to Favorites Watch
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Lee Barker

2163 posts in 1455 days


364 days ago

It has always done this, but I’m becoming more aware of it and challenged by it.

Turn it on: The basic sound of operation is what you’d expect. There is a steady hum from the motor and what it moves, and a sonic pulsing from the oscillating mechanism.

In addition, about every three seconds there is a muted rattling that increases in volume and then decreases at about the same rate. Repeat.

The machine, says Joe, has always done that. Is in inherent in the design?

At one point I put several hunks of concrete in the base cabinet and that solidified things but did not decrease the source of this post.

I have reduced metal tympanic sounds in my jointer by screwing 3/4 plywood panels to the inside of the base, which is similar in construction to the sander.

Experience? Thoughts?

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"


4 replies so far

View Terry Ferguson's profile

Terry Ferguson

202 posts in 1272 days


#1 posted 364 days ago

A shot in the dark – ?anything to do with dust collection pipes or fittings?
My shot could be off by the circumference of the moon, but worth a try.

-- Terry Ferguson, Bend Oregon

View RogerInColorado's profile

RogerInColorado

289 posts in 559 days


#2 posted 364 days ago

If the rattling is occurring on a regular cycle, I would look at how that cycle is tied to the oscillations of the sander belt and work from there. If you actually time the oscillations as some number per minute, and the rattle occurs at some constant, (every 200 oscillations, e.g.) it may turn out to be tied to the cam (or other mechanism) that drives the belt to oscillate. If it has “always” done this, it may not be critical, but it may be annoying and may be curable. It may be as simple as a set screw just a tiny bit off its flat.

Calling the folks at Jet may actually yield a quick answer or at least narrow the places to look.

View Nomad62's profile

Nomad62

691 posts in 1562 days


#3 posted 364 days ago

I am unfamiliar with your machine, so my guess may be off by the same moon… but it sounds as if you have a balance problem with a moving part; or if it has a belt(s) one may be worn out.

-- Power tools put us ahead of the monkeys

View Lee Barker's profile

Lee Barker

2163 posts in 1455 days


#4 posted 363 days ago

Interesting thoughts.

The only belt is the sanding belt, Nomad. It is direct drive.

Roger, I hadn’t thought in that direction. I’ll ponder some more.

Thanks for the inputs so far. I hope for more ideas.

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"

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