LMI wood

Reaction wood

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Reaction wood

Postby Bob Gramann » Wed Jan 13, 2016 8:16 pm

image.jpeg
I'm getting near the end of my supply of real mahogany. The board that this neck came from has produced a couple of dozen guitar necks with no problems (that I know of, yet). Some of it, I cut into backs and sides. Again, no problem. This neck has vertical grain relative to the fingerboard gluing surface. The grain is pretty straight and nothing visible betrays any tension in the wood. The crack occurred with a snap as I was finishing cutting out the peghead on a band saw. Hand pressure is not sufficient to close the crack although it will close completely if clamped. I'm sorry to lose the labor that went into getting the neck this far, but I'm glad this wood didn't get into the guitar. The new neck will be khaya. I don't think that I'm going to use the last plank in the stack that was cut adjacent to this one. I hope the necks from this wood that are already in circulation don't exhibit problems. I post this because it is interesting to me and I've never seen reaction wood with this much tension in it before.
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Re: Reaction wood

Postby Chuck Tweedy » Wed Jan 13, 2016 8:20 pm

Yowza! That piece has major attitude!!
Likes to drink Rosewood Juice
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Re: Reaction wood

Postby Dan Smith » Fri Jan 15, 2016 1:39 pm

I ripped some kind of African Mahogany to use for necks and it bent into a crook after sawing.
After sawing a neck plank, I let it set for a week or two to see if moves at all.
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Them kids was fast as light-nin.
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Re: Reaction wood

Postby David King » Sat Jan 16, 2016 12:53 am

When I first started I had a giant piece of 2" sapele that had the best looking interlocked grain I've ever seen. I tried resawing a section for some neck laminations and they all bowed like mad off the table saw. They are still sitting in the rafters 29 years later.
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Re: Reaction wood

Postby Glenn Ohman » Sun Feb 07, 2016 7:02 am

Thanks for sharing. A great example of why it is wise to always rough rip parts out on the band saw, not the table saw.

Are you having trouble sourcing genuine mahogany?

Glenn
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Re: Reaction wood

Postby Bob Gramann » Sun Feb 07, 2016 10:31 am

I haven't seen any mahogany that I wanted for two or three years. When I find any at a lumber yard now, it seems to be the stuff that no one wanted left over from several years ago. I'm pretty picky about grain direction.
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Re: Reaction wood

Postby Peter Wilcox » Sun Feb 07, 2016 1:05 pm

Glenn Ohman wrote: it is wise to always rough rip parts out on the band saw, not the table saw.

Glenn


Please explain why - no comprendo.
Maybe I can't fix it, but I can fix it so no one can fix it
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Re: Reaction wood

Postby Clay Schaeffer » Sun Feb 07, 2016 9:28 pm

When you rip on a tablesaw you generally use a fence. The internal stresses can either bind the blade (wood closes up on it) or push against the fence and blade (wood gaps open), both of these things causing a kickback. The band saw because of the narrowness of the blade and direction of travel is less likely(never?) to kick back the wood.
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Re: Reaction wood

Postby Mark Fogleman » Sun Feb 07, 2016 10:14 pm

Heck...handful of drywall screws and a cup of epoxy. Good to go! :D
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Re: Reaction wood

Postby Glenn Ohman » Sun Feb 21, 2016 8:05 am

Peter Wilcox wrote:
Glenn Ohman wrote: it is wise to always rough rip parts out on the band saw, not the table saw.

Glenn


Please explain why - no comprendo.


Sorry for the slow reply. For me, it is safer, I get a better yield out of boards, and it is still accurate enough that a pass (or two) on the jointer cleans up the band sawn surface.

Cutting into reaction wood on a table saw is dangerous and hard on the machine.

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