Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters.

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Default Wood cracking

Back in August the wife got me a beatuiful piece of olive wood from Wood
crafters abiut 6x6x2. Well last week I finally got around to cuttung it on
the bandsaw and mounted it on the lathe. Rough turned it to the shape I
wanted with nice 1/4" walls did some sanding and everything was looking
good. The following evening went out to the shop and found the peice had
checked severely. some of the cracking went all the wat thru rhe bowl and
across it. I now have a very expensive chunck of firewood. The wood was
dry when I turned it, any thoughts about what went wrong.
?


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Default Wood cracking

Being 2" thick - sounds like a plate/shallow bowl blank - One would
think it was dry. I suspect water was out but not the oil. The light
oil evaporated under heat or opening of the grain and it dried further.

It might take a plastic bag or wrap around it between turnings - or at
least a paper bag to limit moisture flow, in or out.

Martin

On 11/10/2010 5:45 PM, Marty G wrote:
Back in August the wife got me a beatuiful piece of olive wood from Wood
crafters abiut 6x6x2. Well last week I finally got around to cuttung it on
the bandsaw and mounted it on the lathe. Rough turned it to the shape I
wanted with nice 1/4" walls did some sanding and everything was looking
good. The following evening went out to the shop and found the peice had
checked severely. some of the cracking went all the wat thru rhe bowl and
across it. I now have a very expensive chunck of firewood. The wood was
dry when I turned it, any thoughts about what went wrong.
?


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Default Wood cracking

I have turned two olive blanks of the same size. I just measured another
blank that I have at about 18% moisture content. I turned the first bowl to
near final thickness and put it in a paper bag with its shavings for one
month and then finished it. That was a month ago and it is OK so far. The
second one I turned to final thickness and sanded but did not turn the foot
or put on a finish. I again put it in a bag with its shavings. That was two
weeks ago, I just checked it and no cracking so far. I plan to turn the foot
and put on a finish in another two weeks.

Russ
"Marty G" wrote in message
...
Back in August the wife got me a beatuiful piece of olive wood from Wood
crafters abiut 6x6x2. Well last week I finally got around to cuttung it on
the bandsaw and mounted it on the lathe. Rough turned it to the shape I
wanted with nice 1/4" walls did some sanding and everything was looking
good. The following evening went out to the shop and found the peice had
checked severely. some of the cracking went all the wat thru rhe bowl and
across it. I now have a very expensive chunck of firewood. The wood was
dry when I turned it, any thoughts about what went wrong.
?



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Default Wood cracking

On 11/10/2010 3:45 PM, Marty G wrote:
Back in August the wife got me a beatuiful piece of olive wood from Wood
crafters abiut 6x6x2. Well last week I finally got around to cuttung it on
the bandsaw and mounted it on the lathe. Rough turned it to the shape I
wanted with nice 1/4" walls did some sanding and everything was looking
good. The following evening went out to the shop and found the peice had
checked severely. some of the cracking went all the wat thru rhe bowl and
across it. I now have a very expensive chunck of firewood. The wood was
dry when I turned it, any thoughts about what went wrong.
?




I've never paid for olive, but I've made a lot with it - I can't imagine
it being expensive, just get a piece from a cut down tree....

that said, don't despair. take your piece --- 1/4 inch walls are kind
of thick, but that's a design decision ---- and boil it for about an
hour - there is a good change the cracks will close back up. let it dry
back out, put some super glue in the cracks and re-sand it. you will
not see the cracks without a microscope.

second, learn to live with cracks, exploit them, fill/glue them do
whatever it takes to integrate them into your design
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Default Wood cracking

Marty G wrote:
Back in August the wife got me a beatuiful piece of olive wood from Wood
crafters abiut 6x6x2. Well last week I finally got around to cuttung it on
the bandsaw and mounted it on the lathe. Rough turned it to the shape I
wanted with nice 1/4" walls did some sanding and everything was looking
good. The following evening went out to the shop and found the peice had
checked severely. some of the cracking went all the wat thru rhe bowl and
across it. I now have a very expensive chunck of firewood. The wood was
dry when I turned it, any thoughts about what went wrong.
?


As a last resort before chunking it, this has saved some bowls for me:
get a plastic container with a lid, larger than the bowl. Get a jug of
white glue (got mine from Lowe's) and mix enough half & half with
water to cover the bowl completely. Put a large rock or half brick in
the bowl to keep it submerged and let it soak in the stuff 2 or three
days. Take it out, wipe it down and let dry in a paper bag.

About half the time it will dry with the cracks healed. Re-turn and
sand as necessary.

The last thing I used this on was a 1/2" by 4" disk with a hole in the
center from an OLD spinning wheel. I had turned a replacement piece
but wanted to save the old one if possible. It had a crack from the
center hole to the perimeter about 1/8" wide and it closed up
completely after the glue brew treatment. The customer had planned to
actually use the wheel but wanted it all original if possible.

Further comment: Too aggressive power sanding will build up heat and
cause fine checking on some woods.
--
Gerald Ross
Cochran, GA

To err is human. To blame someone else
is politics.







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Default Wood cracking

On Wed, 10 Nov 2010 17:45:20 -0600, Marty G wrote:

Back in August the wife got me a beatuiful piece of olive wood from Wood
crafters abiut 6x6x2. Well last week I finally got around to cuttung it
on the bandsaw and mounted it on the lathe. Rough turned it to the shape
I wanted with nice 1/4" walls did some sanding and everything was
looking good. The following evening went out to the shop and found the
peice had checked severely. some of the cracking went all the wat thru
rhe bowl and across it. I now have a very expensive chunck of firewood.
The wood was dry when I turned it, any thoughts about what went wrong.
?


Was the piece of olivewood entirely covered in wax when you bought it, or
just the ends? If entirely covered, then the wood didnt get a chance to
loose the moisture content.

Bill
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Bill Stewart wrote:
On Wed, 10 Nov 2010 17:45:20 -0600, Marty G wrote:

Back in August the wife got me a beatuiful piece of olive wood from Wood
crafters abiut 6x6x2. Well last week I finally got around to cuttung it
on the bandsaw and mounted it on the lathe. Rough turned it to the shape
I wanted with nice 1/4" walls did some sanding and everything was
looking good. The following evening went out to the shop and found the
peice had checked severely. some of the cracking went all the wat thru
rhe bowl and across it. I now have a very expensive chunck of firewood.
The wood was dry when I turned it, any thoughts about what went wrong.
?


Was the piece of olivewood entirely covered in wax when you bought it, or
just the ends? If entirely covered, then the wood didnt get a chance to
loose the moisture content.

Bill

Sometimes sanding at high speed generates heat and causes checking.
Have had that happen with sweetgum.

--
Gerald Ross
Cochran, GA




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Default Wood cracking

Olive is notorious for checking and cracking - while drying - while
turning (green or "dry") - or just sitting around after being turned.
It seems proned to self destruction - regardless of what you try to do
to stop it.

Turn with a misting bottle handy and use it as you turn as thin as you
can, as quickly as you can. Put it in the freezer if you can't turn it
to completion in one session. Still may crack and split and check - but
is more apt to deform than tear itself apart.
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Default Wood cracking

On 2/21/2011 6:56 PM, charlie b wrote:
Olive is notorious for checking and cracking - while drying - while
turning (green or "dry") - or just sitting around after being turned.
It seems proned to self destruction - regardless of what you try to do
to stop it.

Turn with a misting bottle handy and use it as you turn as thin as you
can, as quickly as you can. Put it in the freezer if you can't turn it
to completion in one session. Still may crack and split and check - but
is more apt to deform than tear itself apart.


I've had much better results with boiling than with freezing

--
www.wbnoble.com
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