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Forum topic by FrankoManini posted 11-27-2008 04:53 AM 5977 views 0 times favorited 6 replies Add to Favorites Watch
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FrankoManini

40 posts in 3423 days


11-27-2008 04:53 AM

Often whe n turning bowl grain or face grain, or when roughing out a bowl, I will get a bounce or chatter in the tool. This is caused by the piece being out of round. It seems to be “self perpetuating” in that the worse it gets, the worse it gets…

I have the hardest time with bowl gouges and on wood that might have a soft area like spalting or a bark inclusion. The only way I have been able to address it is to try and take smaller cuts, speed the lathe up, or use a scraper to gently ease the piece back to round.

Does anyone know what I might be doing to cause this and how I might go about avoiding it in the future?

Thanks!

-- - If my wife asks, I got ALL of my tools on sale.


6 replies so far

View Alin Dobra's profile

Alin Dobra

351 posts in 3796 days


#1 posted 11-27-2008 05:21 AM

Franko,

This issue takes a lot of patience to learn how to deal with since it depends mostly on the type of wood. You can always use the bowl gouge in a scraping cut and that will take care of the bouncing but might produce a rough surface. Turning the tool so a different part cuts might help as well. On some woods, though, when you turn end-grain, almost nothing you do will help. I usually fix the surface by sanding when the piece is dry, if that happens.
The only advice I can give you is to experiment a lot.

Alin

-- -- Alin Dobra, Gainesville, Florida

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johnpoole

74 posts in 3374 days


#2 posted 12-01-2008 04:27 AM

a few things that helped me.. getting the tool rest a little closer to the wood.. both the ones you posted,, another thing that helped,i broke down and bought a higher grade set of tools.. i was using craftsman.. i can’t remember the name of the new ones, but i got them at woodcraft.. the steel is twice as thick and way harder..

i used to carve a lot, holding the cutting edge in the same manner that i would to cut a stationary piece is how i taught myself to turn.. when you cut against the grain, i use a sharp scrapper, and finer cuts.. but i tend to take my time, at my age that’s about all i can take

-- it's not a sickness, i can stop buying tools anytime i want

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trifern

8135 posts in 3675 days


#3 posted 12-01-2008 06:23 AM

I would recommend a freshly sharpened tool and lighter cuts. Soft areas or punky wood…good luck. You may consider fortifying the soft, punky wood with a 50/50 mixture of Elmer’s glue and water.

-- My favorite piece is my last one, my best piece is my next one.

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johnpoole

74 posts in 3374 days


#4 posted 12-01-2008 09:04 PM

i bought a bottle of elmers rotten wood stablizer, (wife pick it up at lowes).. it turns punky wood into plastic.. at least it cuts like plastic..

-- it's not a sickness, i can stop buying tools anytime i want

View Bob #2's profile

Bob #2

3809 posts in 3929 days


#5 posted 12-01-2008 11:50 PM

You may want to buy or build yourself a couple of steady rests. they help take the “flutter” out of the wood allowing the tool to continue its path.

From wood lathe and tools

As others have already pointed out there are several factors and and no single answer.

Bob

-- A mind, like a home, is furnished by its owner

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Grumpy

23570 posts in 3759 days


#6 posted 12-03-2008 12:06 AM

Franko, all of the above is good advice. You can now buy hollowing tools like the Rolly Munroe hollowing tool that is much more usere friendly & tollerant to dig-ins.
Heres a link
http://www.rollymunro.co.nz/html/fmain.html
There are similiar versions on the market.

-- Grumpy - "Always look on the bright side of life"- Monty Python

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