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Finishing a green bowl (Read 999 times)
 
Dennis Barley
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Finishing a green bowl
Feb 26th, 2008 at 9:46pm
 
OK, folks, need some advice. When turning green wood to finished size, i.e. not leaving any thickness to finish turn, can you immediately sand and finish or do you wait until it's dry? It would seem that once it dries and twists into whatever shape it wants to be, you have to sand it by hand, no? It's so much easier to sand while it's still on the lathe, and I'm getting lazy in my old age.
Thanks.

Dennis
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Rev. Doug Miller
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Re: Finishing a green bowl
Reply #1 - Feb 26th, 2008 at 11:53pm
 
Go ahead and sand and finish.  At least that is one way to do it.  I would boil the piece just to help keep the piece from checking.  It will also knock down some of the warping.  You'll still have to do some hand sanding, but not as much as if you boiled without sanding on the lathe first.  After boiling, give the piece a few days to dry and you can hand sand lightly, just to knock down the fuzz, and finish as usual.
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Mark Rich
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Re: Finishing a green bowl
Reply #2 - Feb 27th, 2008 at 5:04am
 
Hey RevDoug,

Would you use this same process for a natural edge
bowl?

Mark
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Rev. Doug Miller
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Re: Finishing a green bowl
Reply #3 - Feb 28th, 2008 at 12:12am
 
Mark, probably not.  I think with NE I would turn down to final thickness and sand on the lathe and start the finish process ASAP.  Your finish will hold in some of the moisture and slow down the drying process.  That way your checking will be help to a minimum and the warpage will be slower.
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Mark Rich
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Re: Finishing a green bowl
Reply #4 - Feb 28th, 2008 at 4:37am
 
Thanks RevDoug,

I should have asked that question sooner. I turned
my first natural edge this past weekend and it is already
cracking on the bottom.

Mark
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Dennis Barley
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Re: Finishing a green bowl
Reply #5 - Feb 28th, 2008 at 10:15am
 
Thanks, Rev:

I should have made it more clear in my post. It is a NE bowl. And thanks, Mark for correcting my omission. The bowl has been sanded and finished. Now I'll keep my fingers crossed.

Dennis
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Re: Finishing a green bowl
Reply #6 - Feb 28th, 2008 at 11:34am
 
What amount of time would you think has to pass before you are in the clear as far as a green bowl checking?  I turned a cherry bowl yesterday 5.5 x 3 with thickness roughly 3/16 and have put 2 coats of sanding sealer on so far.  Am I in the clear after 48 hours, a week, or 2 months?  Probably different for different bowl types and species, but in general?
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Rev. Doug Miller
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Re: Finishing a green bowl
Reply #7 - Feb 28th, 2008 at 11:44am
 
If the cherry was green, you will probably know in 6-12 hours if it is going to crack.  Other woods may take several weeks if they are going to.  My thought is that generally you should know within 2 months with all wood.  The secret is to get the thickness uniform from top to bottom.  Also, if you are not twice turning, I would suggest that the thickness should be on the thin side, say 1/8" or less.  Less wood means fewer forces of stress fighting against one another.  That clears everything up as clear as mud, huh.
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