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Resawing Question?

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Forum topic by miserybob posted 1514 days ago 1489 views 0 times favorited 19 replies Add to Favorites Watch
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miserybob

88 posts in 1628 days


1514 days ago

I’ve done very little resawing on my 14” bandsaw, but every time I do, the two pieces bow so badly that they’re practically unusable.

What gives?

Is this:

a) poor technique
b) bad choice of materials
c) totally expected
d) other

Thanks!


19 replies so far

View EricRFP's profile

EricRFP

106 posts in 1678 days


#1 posted 1514 days ago

Is the wood bowed right after your cut or does it bow over time? If it starts to bow within a few hours or days, your wood is not dry enough.

-- Eric, NorCal www.rocklinforestproducts.com

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miserybob

88 posts in 1628 days


#2 posted 1514 days ago

It bows immediately. I’ve only used kiln-dried wood, although my storage area is pretty high humidity.

View live4ever's profile

live4ever

982 posts in 1594 days


#3 posted 1514 days ago

If it happens right away, it’s totally expected. Much depends on the grain orientation of the original board but it’s sort of hard to predict – maybe someone who understands wood science better than me will chime in. The bottom line is a cutting operation like resawing releases a lot of stress in the board. The resawn boards will move as a result of this.

I had a beautiful, beautiful piece of beech laying around that I had been planning to resaw for a special project. It bowed right after I resawed it the other day – approximately a 1/4” bow on a resawn board 3/8” thick. :( Somehow I have a feeling the more beautiful the board the more likely it is to warp after resawing!

-- Optimists are usually disappointed. Pessimists are either right or pleasantly surprised. I tend to be a disappointed pessimist.

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a1Jim

111999 posts in 2161 days


#4 posted 1514 days ago

If the wood bows as you saw it it’s internal stress on the wood and or being to wet. If it bows afterward it’s due to not drying equally on both sides .you also need to make sure your band saw is set up to allow for drift. Also a sharp blade is important.

-- http://artisticwoodstudio.com Custom furniture

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EricRFP

106 posts in 1678 days


#5 posted 1514 days ago

Not to get too much off topic but just because wood was kiln-dried does in no way mean it’s still at 6-8% MC. Why do you use only kiln-dried wood?

-- Eric, NorCal www.rocklinforestproducts.com

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miserybob

88 posts in 1628 days


#6 posted 1514 days ago

Hi, Eric – I sometimes use air-dried wood (although it’s harder to find, it seems), I just haven’t tried resawing any of it yet. It may well be that my not-so-climate-controlled garage is making my stock moist.

View miserybob's profile

miserybob

88 posts in 1628 days


#7 posted 1514 days ago

Jim – is there a way to tell if wood is going to bow (grain pattern, etc)? Are certain kinds of wood (highly figured, or certain species) more apt to warp?

Thanks!

View Bill Davis's profile

Bill Davis

226 posts in 2508 days


#8 posted 1514 days ago

Sounds to me very much like case hardening. You can test for that before re-sawing by cutting off a smaller piece and bandsawing it a particular way.

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a1Jim

111999 posts in 2161 days


#9 posted 1514 days ago

Bob any wood can have internal stress , if wood is in a stress such as being wind blown and after being sawn it will move to regain it’s original shape

-- http://artisticwoodstudio.com Custom furniture

View fussy's profile

fussy

980 posts in 1635 days


#10 posted 1514 days ago

Bob,

Is the wood bowing, or are you getting what is called a “barrel cut”? Bowing is warping or twisting. In a barrel cut, if you look at it edge-on, one side is curved (CONVEX), and the other side—from the other side of the blade is convex. This is easy to fix. Make certain the saw is set up correctly; ie. the blade tracks in the center of the upper wheel, the table is square to the blade, and upper and lower guides are properly adjusted. If all this is done and you still get a barrel cut, you have a dull blade. They don’t last forever, and even new ones sometimes have problems.

Michael Fortune had a very informative article on bandsaw set up in Fine Woodworking a few years ago. I followed his advice, and now I love my bandsaw. If you’d like, pm me and I’ll e-mail a copy.

Hope this helps,

Steve

-- Steve in KY. 44 years so far with my lovely bride. Think I'll keep her.

View a1Jim's profile

a1Jim

111999 posts in 2161 days


#11 posted 1514 days ago

Interesting fussy do you know what issue?

-- http://artisticwoodstudio.com Custom furniture

View miserybob's profile

miserybob

88 posts in 1628 days


#12 posted 1514 days ago

Fussy – Yeah, I used that article to setup the saw! It’s in FWW #173, Jim.

The boards come out like closed parens if you’re looking down at them standing on edge, () . I think what you’re describing is when they come out like this: (( ?

The blade is new.

View a1Jim's profile

a1Jim

111999 posts in 2161 days


#13 posted 1514 days ago

Thanks Bob

-- http://artisticwoodstudio.com Custom furniture

View bill merritt's profile

bill merritt

203 posts in 1873 days


#14 posted 1514 days ago

Thanks for that info. now I have to find it.

-- Bill Merritt -Augusta Ga. woodworker

View Dragonsrite's profile

Dragonsrite

136 posts in 1981 days


#15 posted 1514 days ago

Could the tension be too loose or maybe feeding too fast?

-- Dragonsrite, Minnesota

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