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Measuring wall thickness (Read 3,556 times)
 
Boots
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Re: Measuring wall thickness
Reply #15 - Sep 3rd, 2005 at 1:08pm
 
Hi,
     The one thing that hasnt been mentioned here is centrifugal force, at the high speeds mentioned surely the piece is being pulled by quite a force, the thinner you go the less fibres there are holding it together, if you have say heart wood and sap wood in the same piece then you have a weight difference, this will inevitable mean you have an oval turning not a round, when you apply the tool it is either hitting the high spots or reshapping back from oval to round, its a bit like bending a piece of wire back and forth, it will eventually break all the fibres,  Any thoughts?

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Re: Measuring wall thickness
Reply #16 - Sep 3rd, 2005 at 1:31pm
 
Hi again,
            On reading the previous message written by me this thought came to mind.

Woodturning to most of us is a hobby, its best kept plain and simple in as much as, just turn slightly thicker walls and enjoy it, especially if it removes those sweaty hands and brows whilts waiting for the turned piece to take flight.

Just a thought.

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Ned A from South GA
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Re: Measuring wall thickness
Reply #17 - Sep 3rd, 2005 at 4:11pm
 
Agreed, what a good thought it is, we often forget to make it fun.
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Re: Measuring wall thickness
Reply #18 - Sep 3rd, 2005 at 5:09pm
 
I will agree, in part, less grief is bound to be more fun, BUT there is the thing known as "challenge your self". If I am able to turn a bowl to 1/4", then I may want to try 1/8" just to see if I can do it. After 1/8" becomes the norm, and is now "fun", along comes 1/16", etc; and it is fun to try turning them thinner and thinner. Then again, the other day I turned a Black Cherry Natural Edge Bowl, and stopped at 5/16" just because the bowl felt good that thick, filled in two large voids with Turquoise and am happy with it. It is in my gallery, is it bad at 5/16" wall thickness? Maybe, but I like it.
I suspect that if you are turning for a living, the game takes on an entirely different meaning. It may still be fun, but it is now work, and work equals food, etc.
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Re: Measuring wall thickness
Reply #19 - Sep 3rd, 2005 at 6:34pm
 
When I was just starting I was handed a book to look over (it was borrowed from the library).  In it were several bowl exercises for new turners.  Many different shapes and styles of bowls were to be done in multiples until the turner became comfortable with each one.  One of the most challenging was to turn a simple open bowl with one difference, turn the walls an even 1/32" thick from rim through bottom.  Now, that's thin.  The author's point was that if you actually get to the point that 1/32" is comfortable, think how easy 1/16" or even 1/8" will seem. 

Just wish I could remember what the name of that book was.  "Turning Green Wood" maybe?  Purhaps one of you could remind me so that I can get a copy and review those exercises.   8)
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Ned A from South GA
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Re: Measuring wall thickness
Reply #20 - Sep 4th, 2005 at 4:55am
 
I have seen the book as well, can't remember the name, either.

Gil, chanllenging yourself can still be fun. I was referring more to the attitude and the death grip, hand shaking approach that often comes with a too serious (for lack of a better word) attitude. Even trying to get it a thin as possible should be a fun adventure for those of us not counting on this for a living. As long as it doesn't become cavalier or unsafe, a good attitude should make all of it fun. When it becomes frustrating or nerveracking, it is time to take a 30 minute break and do something else.  When you come back more relaxed, not only is it more fun, it is easier and relaxing as well.

I'll get of my soapbox now Smiley
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Re: Measuring wall thickness
Reply #21 - Sep 4th, 2005 at 8:30am
 
Yup, sounds right. The death grip, hand-shaking approach to woodturning has "accident" written all over it, and probably is not fun.
Been thinking of raising my lathe bench up about a foot, so I can stay up on my soapbox.
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Re: Measuring wall thickness
Reply #22 - Sep 4th, 2005 at 8:33am
 
I made a vase down to paper thin just to see how far I could go.  I took it into the house to show the wife my new vase and she told me it would bend when she applied pressure to it and I told her not to do that or it would break.  The she said too late it had split down the side.   I turned another that day but she hasn't gotten her hands on it yet.  It had no function but to see how thin I could go.  It was fun and a challenge.  Most of my bowls are between 3/16 and 1/4 unless it is a special request and I have done a few 3/8 to 1/2 which sure feel heavy and big compared to the thinner ones.  Nearly all my hollow forms are around 3/16 and I seem to like them there.  I guess I need to challenge myself to go thinner but just haven'e do so yet.  But the biggest challenge now is just getting time to go to the shop.  I am working 12 hour  days 7 days a week.  with a 3 hour drive round trip that doesn't give much time.  Maybe it will get better in the future.  I need a saw dust fix badly.  Maybe just turn a pen or something.
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Re: Measuring wall thickness
Reply #23 - Sep 4th, 2005 at 9:56am
 
The book is titled Turning Green Wood by Michael O'Donnell.  I found it on Amazon for $17.95 at:

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Re: Measuring wall thickness
Reply #24 - Sep 4th, 2005 at 12:51pm
 
That's the one.  Thanks Jim.  Guess I've got to place an order now.   8)
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Ned A from South GA
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Re: Measuring wall thickness
Reply #25 - Sep 4th, 2005 at 1:18pm
 
Sad thing is I already have it, just couldn't remember the title.
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Gil Jones
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Re: Measuring wall thickness
Reply #26 - Sep 4th, 2005 at 6:34pm
 
Our library has it. It is an excellent book.
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