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Thread: Quarter sawn vs rift sawn
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25th January 2014, 01:02 PM #1Senior Member
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Quarter sawn vs rift sawn
This is out of interest rather than build necessity but I am somewhat confused between how this is achieved?
i understand the intent of both, but uncle google comes up with a TONNE of info on this and some of the results become confusing!?!?
To me, the traditional quarter sawn side in the pic below has a couple if rift sawn boards (the two longest ones) but tends to taper off toward the pith. The modern side has 2 at each quarter but again, become less rift sawn toward the pith.
then this one....
Seeing the growth rings run perpendicular, I assumed rift sawn? Wrong....
And this one just thoroughly smashes any idea I thought I had.....
So I'm incorrect in saying rift sawn runs perpendicular to the growth rings (mostly) and quarter sawn is a compromise between rift and flat sawn??
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25th January 2014, 02:22 PM #2GOLD MEMBER
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Here at 53N, those 'quarter-sawn" diagrams are incorrect. Dreadfully wasteful.
1/4 of a log is cut such that the growth rings are semicircular.
The "modern" side of your very first diageam is what is done here.
With our softwoods, spruce, pine & fir, the cut maximizes the yield from each log and mitigates the shrinkage/movement parameters of the radial and tangential planes. Some of one, some of the other.
What you have to do, with the wood you have, where you live, may not match what happens here.
Annual allowable cuts here are defined in the millions of cubic meters.
Not so much these days but I can recall when there was a truck, loaded with good logs, rolling through the city every 30 seconds. In BC alone, we have 18,000,000 ha standing dead pine which is not worth the powersaw gas to cut it down.
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25th January 2014, 02:57 PM #3SENIOR MEMBER
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26th January 2014, 08:28 AM #4part time wood mangler and ukulele player
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But is a flat sawn 2 by 4 a quarter sawn 4 by 2?
Handy to think about when you are going to rip I down into small pieces anyway.
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26th January 2014, 08:56 AM #5Senior Member
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Yes - quartersawn is where the rings are at circa 90* to the face. Rift sawn is 30* to 60*. Plain/flat sawn by implication is 0* to 29* (at least that is my understanding).
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26th January 2014, 11:14 AM #6SENIOR MEMBER
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QTRSAWN001.jpg
The illustration above shows that one (the middle board cut from the plank) 4 x 2 flat sawn becomes a 2 x 4 qtr sawn. I guess you pick your boards carefully, for example if you are selecting 4 x 2 boards to make a laminated bench top 4" thick
You do not want to waste the wood? Might be some interesting patterns? Stability is somewhere between flat and quarter.
I understand that Tassie Oak and Vic Ash are almost always quartersawn due to general instability problems. I guess the waste becomes dowels (or wood chips).
Cheers
Peter
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26th January 2014, 04:42 PM #7SENIOR MEMBER
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