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Bowl is "singing"???? How come?

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Forum topic by dig4gold posted 01-30-2017 08:31 PM 1102 views 0 times favorited 9 replies Add to Favorites Watch
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dig4gold

4 posts in 317 days


01-30-2017 08:31 PM

Just joined Lumberjocks just to get an answer to my dilemma . . .
Blank is 12” in diameter and about 5” tall. I’ve roughed it to a smooth bowl shape inside and out to about an average of 1/2” thick.
I’ve noticed a “singing” sound coming from the bowl (not chatter) and it gets more noticeable as I approach the rim. Bowl is a conical shape with the base being about 5” and getting progressively wider to the rim with straight sides inside and out.
Sings more when working the exterior. Have I made a musical instrument or what?!


9 replies so far

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dig4gold

4 posts in 317 days


#1 posted 01-30-2017 08:43 PM

Might have found a solution . . . made a Jam Chuck! Quieted it right down and the cuts are so much smoother. (Been using my square carbide)

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Bill White

4802 posts in 3796 days


#2 posted 01-30-2017 08:50 PM

Jam chucks are for jelly. JAMB chucks are for the lathe.
Ya didn’t say what wood you were turning. Some “tone woods” have that tendency. Just a resonance.
Bill

-- bill@magraphics.us

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dig4gold

4 posts in 317 days


#3 posted 01-31-2017 02:14 AM

layers of black walnut and oak, 5/8” each, 6 layers with bottom.

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Lazyman

1503 posts in 1223 days


#4 posted 01-31-2017 02:51 AM



Jam chucks are for jelly. JAMB chucks are for the lathe.
Ya didn t say what wood you were turning. Some “tone woods” have that tendency. Just a resonance.
Bill

- Bill White

Not so sure about your definition of jamb. A jamb is part of a doorway. A jam chuck is called that because you jam (not jamb) the piece onto it.

As for the original question, it is likely you are just getting vibrations or resonance. It might not do that at a different speed? The JAM chuck probably just prevents it from vibrating.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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BenDupre

531 posts in 323 days


#5 posted 01-31-2017 03:10 AM

If you can hear it or feel it you will see it in the wood. Its a vibration. It IS chatter. Your solution is correct. The answer is support. It can also bee a tool getting dull.

-- The problem with communication is the illusion that it has occurred. – George Bernard Shaw

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papadan

3584 posts in 3204 days


#6 posted 01-31-2017 05:06 AM

Since you have a made up turning block, you may have a slight missed glue spot that is acting like a whistle. Slow down the rpm and see if it quietens down.

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dig4gold

4 posts in 317 days


#7 posted 01-31-2017 05:27 AM

Oh yeah . . . I’m at 550 – 640 rpm. I believe it is the result of a sympathetic vibration that increased as the wood got thinner and therefore more easily resonant. And I did see the result in the wood . . . not digging in but kind of small scooping marks. They went away when I engaged the JAMMBMBBM chuck.

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papadan

3584 posts in 3204 days


#8 posted 01-31-2017 05:37 AM


Oh yeah . . . I m at 550 – 640 rpm. I believe it is the result of a sympathetic vibration that increased as the wood got thinner and therefore more easily resonant. And I did see the result in the wood . . . not digging in but kind of small scooping marks. They went away when I engaged the JAMMBMBBM chuck.

- dig4gold


So that’s how it’s spelled! ;-) The fruits win this one!

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splatman

586 posts in 1234 days


#9 posted 01-31-2017 06:12 AM

Singing bowls and jam chucks… Rockin’ in the woodshop? Sounds like something Kyle Toth always has going on.

Maybe build a Wood Harmonica and have a Jam Session! Wooden version of the Glass Harmonica, that is.

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