need help on a cherry bowl - Woodworking Talk - Woodworkers Forum
 
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post #1 of 14 Old 11-25-2012, 10:09 AM Thread Starter
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need help on a cherry bowl

so i turned this bowl a couple weeks ago and just now getting around to posting my problem
it was a nice big chunk just barely clearing my bed
it all turned great until i got to the inside
i took everyone advice and turned about an inch at a time to finished thickness but that is where i had trouble
i still got chatter terrible on the whole thing.i used a sorby 3/8" bowl gouge. i made sure my tool was sharp and even went back and put an edge on it to do the final cut.
this thing is 1/4 thick or slightly thicker and i know you guys turn alot thinner
i tries slow speed and high speed and still had the chatter
whats up here
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post #2 of 14 Old 11-25-2012, 10:33 AM
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I cannot help with the chatter, other than to sympathize since I can also manage to get similar results.

In my cases, this is when I change to using my scraper. I know this is considered cheating to some folks, but anything I can do to reduce sanding is fine with me.

A very nice piece of cherry. I hope you post the "after" pictures once you solve the problem.
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post #3 of 14 Old 11-25-2012, 10:36 AM
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Quote:
Originally Posted by Dave Paine View Post
I cannot help with the chatter, other than to sympathize since I can also manage to get similar results.

In my cases, this is when I change to using my scraper. I know this is considered cheating to some folks, but anything I can do to reduce sanding is fine with me.

A very nice piece of cherry. I hope you post the "after" pictures once you solve the problem.

Boy,do I cheat a lot!!!!!ha,ha,Mack
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post #4 of 14 Old 11-25-2012, 10:44 AM Thread Starter
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well i guess i cheat alot too but i didnt on this one and wish i would have
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post #5 of 14 Old 11-25-2012, 10:53 AM
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Quote:
Originally Posted by robert421960 View Post
so i turned this bowl a couple weeks ago and just now getting around to posting my problem
it was a nice big chunk just barely clearing my bed
it all turned great until i got to the inside
i took everyone advice and turned about an inch at a time to finished thickness but that is where i had trouble
i still got chatter terrible on the whole thing.i used a sorby 3/8" bowl gouge. i made sure my tool was sharp and even went back and put an edge on it to do the final cut.
this thing is 1/4 thick or slightly thicker and i know you guys turn alot thinner
i tries slow speed and high speed and still had the chatter
whats up here
I have been thur this with cherry, and the only thing I can tell you,is to make sure your tool rest is as close as you can get it to your work.
I'll go about a inch,then use my 3/4 scrapper,and get smoth,and then go on some more.Make sure your machine is up to right speed.Was your bowl round when you started?Don't worry about thick wall.You should see some of my first ones.I got better;Mack

Last edited by Big Mack; 11-25-2012 at 11:00 AM.
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post #6 of 14 Old 11-25-2012, 11:31 AM
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You may not be rubbing the bevel of the tool. I don't know how your bowl gouge is ground but the sides of the bowl are pretty steep. When you get to the transition between the sides and the bottom you may not be able to rub the bevel when cutting from the rim down. That looks about where your lines are in the bowl.
To get around this I use a bowl gouge that has a more blunt grind. This allows you to rub the bevel through the transition point.
To get around this if you don't want to regrind the one bowl gouge you have use a round nose scraper with a fresh burr. Put the tool rest as close to the work as you can and take light cuts. I grind off the left shoulder of my round nose gouges so there's less chance of a catch when coming up a steep sided bowl like that.
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post #7 of 14 Old 11-25-2012, 12:05 PM
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When I start to get chatter like that, I will power sand the project starting with 60 all the way to 220. It helps eliminate the edges the tool will catch on and keep the tool from continuing to chatter.

In my limited experience, it seems to me that chatter is from catching an edge, sharp or not after sanding the tool does so much better.

It's all fun and games until someone loses the Walnut.
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post #8 of 14 Old 11-25-2012, 12:23 PM Thread Starter
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john im no expert yet on rubbing the bevel as i cut but i am getting better especially inside
i was doing good on the bevel on this one till i started getting the chatter
maybe the scraper is the answer
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post #9 of 14 Old 11-25-2012, 02:10 PM
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Well two things come to mind.
1. You might be using too much of the point of the tool. Try rolling it over to use more of a shearing cut and more of your bevel. You might also try grinding off some of the heel off the tool.
2. If you are really turning 1/4 inch or less which is really thin you are getting bowl flex. This will really cause chatter. You might try one handed turning using the other hand to put an equal amount of pressure on the outside. Light cuts are obviously mandatory here. If that bothers you buy or make a bowl steady. The latter is a better solution for most turners.

The only reason to turn that thin is to impress other turners. 3/8th to 1/2 inch is a good thickness for most bowls.
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post #10 of 14 Old 11-25-2012, 02:12 PM
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John was right on, you need a different angle bowl gouge to get in the bottom of deeper bowls. I'm not suggesting you necessarily buy his tools, but go to the Craft Supplies USA website and look at the Mike Mahoney tools. http://www.woodturnerscatalog.com/t/7/2/31/129/Bowl-Turning-Tools He has different grinds for different aspects of the bowl. And if you're going to use a scraper (I do often) do yourself a favor and get one of the Sorby heavy bowl scrapers. http://www.woodturnerscatalog.com/p/...raper/scrapers. Once you use this you won't regret the money spent.

That bowl was perfect right up until that last cut...
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post #11 of 14 Old 11-25-2012, 04:57 PM Thread Starter
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sreve i actually have that scraper and yea its nice for sure
i was under the impression that a good turner could use a bowl gouge and turn the whole bowl
im definatly not good by any means but was trying to turn a bowl with just the bowl gouge
you all make me feel better about turning thicker and using my scraper
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post #12 of 14 Old 11-25-2012, 06:37 PM
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A really good turner can turn without using a scraper. I've seen demos by guys who can turn to finish without scraping or sanding, now that's impressive.

That bowl was perfect right up until that last cut...
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post #13 of 14 Old 11-26-2012, 10:25 AM
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hey robert, one thing that hasn't been said yet. If this bowl is large and was even somewhat wet, it will warp, even while you are turning. That makes it extremely hard to get a clean cut on the rim unless you take off quite a bit of wood. Try turning the rim first, like an inch at a time, turn it from start to finish so that the center of the bowl supports the rim. Does that make sense?

good luck!
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post #14 of 14 Old 11-26-2012, 12:09 PM Thread Starter
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Nate that's what I did and still had these problems and yea it was green too
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