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thin wall vibration

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Forum topic by Karda posted 11-11-2019 11:41 PM 348 views 0 times favorited 8 replies Add to Favorites Watch
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Karda

1832 posts in 1116 days


11-11-2019 11:41 PM

Hi, i am returning so bowls I had drying. Some are deep. not to deep but deep enogh that I have to put the tool rest inside thew bowl. Not a problem until i get towards the bottom. When the wall starts to get thin the vibration starts. By this time I am cleaning up tool marks with a scraper. What can I do to avoid this thanks mike


8 replies so far

View LeeMills's profile

LeeMills

685 posts in 1863 days


#1 posted 11-12-2019 11:17 PM

You are probably doing this already….
As you get close to the thickness you want turn the top 1-1.5” to completion, then move down to the next 1-1.5”, and so on. Do not try to go back to the top edge.
If you are using a standard scraper it can set up a lot of vibration; if you have one try a negative rake scraper with a light touch to remove the tool marks.
Mine are almost always functional (vs artistic) so my walls may be 1/4 to 3/8 thick depending on the size. Exception would be very small, like 4-5”, where I would have thinner walls.
If you are using a negative rake you may do like some folks, use one hand on the outside to steady the bowl and the other holding the tool with a light touch.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

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Karda

1832 posts in 1116 days


#2 posted 11-13-2019 12:01 AM

I try to do sections to finish but my tool control isn’t that great and get ridges that I can’t get out with gouges i need to scrape I try the neg rake

View BobAnderton's profile

BobAnderton

308 posts in 3353 days


#3 posted 11-13-2019 02:38 AM

Something like this, or a home made version.

-- Bob Anderton - Austin, TX - Nova 3000 lathe, Alaskan Mark III mill, Husqavarna Saw

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Karda

1832 posts in 1116 days


#4 posted 11-13-2019 04:23 AM

ok thats an idea

View OSU55's profile

OSU55

2450 posts in 2552 days


#5 posted 11-13-2019 01:59 PM

I use a piece of leather in my left hand to apply pressure to the bowl OD, same as the bowl steady

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Karda

1832 posts in 1116 days


#6 posted 11-14-2019 12:05 AM

ok thanks I try a gloved hand

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TheDane

5709 posts in 4225 days


#7 posted 11-14-2019 01:13 AM

ok thanks I try a gloved hand

- Karda

I would not use a glove … a simple snag could wind up costing you a trip to the ER. OSU55’s suggestion (a piece of leather) is much safer.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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Karda

1832 posts in 1116 days


#8 posted 11-14-2019 01:32 AM

ook

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