wood cracking - Woodworking Talk - Woodworkers Forum
 
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post #1 of 7 Old 11-19-2012, 07:07 PM Thread Starter
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wood cracking

Im new to this forum, Found it by searching a question on how to prevent wood from cracking after I turn it on the lathe, When it sits to dry after a few days. Have tried mineral oil to keep it moist.
I have been using fresh cut wood.
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post #2 of 7 Old 11-19-2012, 07:19 PM
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What are you turning? For bowls and hollow forms you need to rough turn them and then dry them in a paper bag and shavings. Finish turning after it has dried. There are other methods as well and others will chime in with more suggestions. For other turning the wood should be dry before you turn it.

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post #3 of 7 Old 11-19-2012, 07:40 PM Thread Starter
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Just got a lathe and started turning bowls, hats and things of that nature. Turned out really good untill cracking developed. I turned some cedar bowls that was really dry wood without a proplem but it beat me up. SO I decided wet wood. I will try your suggestion.

Thanks
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post #4 of 7 Old 11-19-2012, 07:43 PM
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Welcome to the forum!
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post #5 of 7 Old 11-19-2012, 07:43 PM
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Just a few things adding to bass blaster.
1. rough turn the form so that the thickness is around 1/10 the diameter of the entire piece
2. remove from the lathe as bass said and let it dry in a paper bag. What you are going for here is to SLOW the escape of moisture from the wood
3. Open the bag from time to time and allow some air circulation.
4. if it is a piece of wood prone to cracking put anchorseal over the endgrain to slow the loss of moisture.
5. While it is drying there may be cracking or warping depending on the species moisture content and location of the blank in the tree
6. avoid the pith of the tree and knots... they are the most prone to cracking
7. If you don't want to go through the whole drying process you can turn the entire piece in one go provided that the diameter of the rim is a quarter inch or less.
8. If you decide to turn it all in one go keep in mind that a uniform wall thickness is important. If the wall is not uniform one area will dry faster than another and cracks will occur.
9. While you are turning the wet wood make sure to keep the out side of the piece moist... spray it down with water and throw a bag over it if you have to leave it for even a night.
10. when moving on to sanding it's helpful to have a air compressor. In wood there is what is known as free water and trapped water. The free water will blow right out of the wood if the wood is thin enough. This helps keep the sandpaper unclogged.
Thats about all I got... good luck and happy turnin,
Bond
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post #6 of 7 Old 11-19-2012, 08:01 PM Thread Starter
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you guys are great, that makes alot of sense. the oak bowl I made with the lid started to crack at the base and did not crack at the walls where it was 1/4 inch. The lid was thick and it cracked as well. I noticed that sitting on the table the water from the wood was draining out.

Thanks for the replies.
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post #7 of 7 Old 11-19-2012, 11:35 PM
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Quote:
Originally Posted by bond3737
Just a few things adding to bass blaster.
1. rough turn the form so that the thickness is around 1/10 the diameter of the entire piece
2. remove from the lathe as bass said and let it dry in a paper bag. What you are going for here is to SLOW the escape of moisture from the wood
3. Open the bag from time to time and allow some air circulation.
4. if it is a piece of wood prone to cracking put anchorseal over the endgrain to slow the loss of moisture.
5. While it is drying there may be cracking or warping depending on the species moisture content and location of the blank in the tree
6. avoid the pith of the tree and knots... they are the most prone to cracking
7. If you don't want to go through the whole drying process you can turn the entire piece in one go provided that the diameter of the rim is a quarter inch or less.
8. If you decide to turn it all in one go keep in mind that a uniform wall thickness is important. If the wall is not uniform one area will dry faster than another and cracks will occur.
9. While you are turning the wet wood make sure to keep the out side of the piece moist... spray it down with water and throw a bag over it if you have to leave it for even a night.
10. when moving on to sanding it's helpful to have a air compressor. In wood there is what is known as free water and trapped water. The free water will blow right out of the wood if the wood is thin enough. This helps keep the sandpaper unclogged.
Thats about all I got... good luck and happy turnin,
Bond
Dang, Bond. You just summarized all written works on green turning in 10 bullet points. You should write for Cliff Notes.
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