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Author Topic: Redneck testing
kennym
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Not sure how I did that!! The lams are exactly 36" , deflection checked with 6" over end of bench with straight board clamped on top to hold down, 2" spring clamp for weight 1/8" from lam end.

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Stay sharp, Kenny.

https://www.kennysarchery.com/

Posts: 11910 | From: Linneus , Mo. | Registered: Jan 2004  |  IP: Logged | Report this post to a Moderator
Roy from Pa
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What was the weight of the spring clamp?
This flaw throws a curve ball into your testing.
Ya some kind of Missouri redneck...
AH NEVER MIND.

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goobersan
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[knothead]

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To give anything less than your best is to sacrifice the gift.

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monterey
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I saw something similar done comparing wood lams to foam. The foam hung like a wet noodle.

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Monterey

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Bvas
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If Im interpreting this correctly, then the hickory did slightly better than the maple. As they both had the same deflection but the hickory is lighter. (Assuming that is a typo, and the maple didn't elevate 7/8 for a negative reading [Big Grin] )

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Some hunt to survive; some survive to hunt

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kennym
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I talked to a good bowyer this morning and he got me thinking....

So tonite I cut some .060 parallel lams exactly the same length, checking thickness on each one and adjusting as needed to get as close to .060 as possible. Also cut all to 1.5" width with table saw set for all so as close as possible to exact.

The deflection was checked by hanging over end of bench 6" and clamping it and a straight board down to bench. Then measuring deflection to straight board, and flipping over to check and average result. I used a 2" spring clamp square on the lam end 1/8" onto the end of lam , was gonna weigh it but didn't yet.

Here are the results so far, most of these would be core woods, and are edge grain.

Wood -- weight in grains -- deflection in "

R. elm ------- 32.4 -------- 1 1/16
A-wood ------- 44.2 -------- 7/8
Amber boo ---- 37.4 -------- 1 1/4
Nat boo ------ 41.0 -------- 1 3/16
Ash ---------- 34.8 -------- 1 5/16
Walnut ------- 32.4 -------- 1
H locust ----- 39.5 -------- 1 3/8
Hickory ------ 39.6 -------- 7/8+
Osage -------- 49.1 -------- 7/8+
Maple -------- 41.1 -------- 7/8-

See why a lot of old bows were maple core? LOL

Hope these numbers can help you decide on cores, but the numbers are pretty much controlled by the individual tree they came from. YMMV

>>>>>--------------------->

The yardstick I was using was in 1/16" inc. so I added a plus or minus if above or below the 1/16" measure. So the maple bent less and the hickory was lighter . Maybe it should have been -7/8".

Or maybe should have done in 1/1000 " I have a dial indicator but it is an inch job.

Seems to be a correlation in weight vs stiffness of lams in general but some just seem to fail in both and need to be veneers.....

Should have done a bocote lam and some glass for fun...

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Stay sharp, Kenny.

https://www.kennysarchery.com/

Posts: 11910 | From: Linneus , Mo. | Registered: Jan 2004  |  IP: Logged | Report this post to a Moderator
Bvas
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Also, I took and relisted from lightest to heaviest.
Now, delete any woods that are both heavier and deflect same amount or more than any previous wood.
This leaves only two woods.....walnut and hickory.

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Some hunt to survive; some survive to hunt

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Bvas
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I get it now!!!
So hickory was 29/32 and maple was 27/32.

That means maple would be back on the list lol

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Some hunt to survive; some survive to hunt

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kennym
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I'd say maple and hickory are real close, the hickory bent roughly a 1/16 more than maple and the maple is 1.5 grains heavier. (now let the hickory lay around a week cut in lams and draw moisture and the maple would be in front [Big Grin] )

Do the math on the weight / deflection and tell me!! [laughing]

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Stay sharp, Kenny.

https://www.kennysarchery.com/

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Bvas
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For now, Im sticking with walnut. Seems smooth and quiet. [Smile]
But I also haven't finished Avery's maple cored bow. [Wink]

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Some hunt to survive; some survive to hunt

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kennym
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I like walnut, in this test it is less than an 1/8 more deflection and 7.2 grains lighter.

It seems to make a quiet bow too. Don't know how it would but to me it does. Let me know what you think when you get hers done!

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Stay sharp, Kenny.

https://www.kennysarchery.com/

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Shredd
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Maple is a proven core wood... I have heard that even though hickory can make a fast bow it does not fare as well as maple in the long run... What say Yee'all???
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Crooked Stic
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I think walnut would be ok in edge grain. I know that it soaks a lot of glue.

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High on Archery.

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Mad Max
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Hard Rock Maple Rift sawn.

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"nothing ventured ,nothing gained"

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Roy from Pa
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Bamboo...............
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