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 Post subject: Jan 11 Quiz question
PostPosted: Mon Jan 10, 2011 3:20 pm 
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Name and explain the means of testing wood's hardness.

ready, steady, GO.....

:wink:

eric


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PostPosted: Mon Jan 10, 2011 7:47 pm 
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Don't know about wood but steel is done by droping a steel ball of a given weight a given height and measuring the dent made in the object and is called the rockwell measuring system.

Duan

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PostPosted: Mon Jan 10, 2011 9:40 pm 
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Clipper wrote:
Don't know about wood but steel is done by droping a steel ball of a given weight a given height and measuring the dent made in the object and is called the rockwell measuring system.

Duan


You forgot its name "Janka"

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PostPosted: Mon Jan 10, 2011 9:45 pm 
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Eric thanks for the stimulus! The puzzler always leads to education!
CLIPPER and DADDY GLOVES hard on the trail. This gives some detail.

http://en.wikipedia.org/wiki/Janka_hardness_test

Good one keep them coming as you can

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 Post subject:
PostPosted: Tue Jan 11, 2011 9:05 am 
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How easy the nail bends???

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 Post subject:
PostPosted: Tue Jan 11, 2011 11:25 am 
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Hardness of metal objects is measured on a scale of hardness called Rockwell. I recall reading about measuring the hardness of wood using steel ball being either dropped or pressed into the surface at a given amount of pressure. But don't remember what it was called.

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 Post subject:
PostPosted: Tue Jan 11, 2011 11:33 am 
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Sean McNulty wrote:
How easy the nail bends???


That's how I would do it. :D :D :D

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PostPosted: Tue Jan 11, 2011 2:01 pm 
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The Janka hardness scale measures the amount of pressure required to embed a steel ball to half its diameter into the surface of the wood.

Bob


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 Post subject:
PostPosted: Tue Jan 11, 2011 5:28 pm 
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Right - Bob's got it. The ball diameter is .44" according to Wikipedia.

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PostPosted: Sun Jan 16, 2011 6:30 pm 
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Duan, and Monte were on the right scent, and Bob put it all together.

look for the next exciting installment below, or above, or maybe to the right.....

Eric


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 Post subject:
PostPosted: Sun Jan 16, 2011 7:53 pm 
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Jeff Fox wrote:
Sean McNulty wrote:
How easy the nail bends???


That's how I would do it. :D :D :D


Thanks, Jeff, great minds think alike.

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Countin' flowers on the wall,
that don't bother me at all,
smokin' cigarettes and watchin' Captain Kangaroo,
Now don't tell me I've nothin' to do.

Second recipient of the D'oh Award. 4-13-08


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