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olddawgsrule
Advanced Member


USA
1434 Posts

Posted - October 05 2014 :  17:32:16  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
I've leaned on RonO so many times for just this..
Math or Formula problems.

So I thought in 'my' quest this time, I'd ask all (instead of burdening him again).

My issue is building a graph to show moisture content.
In my case it's my wood.

Known:
At 50% moisture a piece of Red Oak will weigh 17.35ozs per 1% moisture.
At 20% moisture the same piece will weigh 29.87ozs per 1% moisture

I'm assuming I can draw a straight line through to continue in either direction to create a 'close' graph.
I say close, only because I don't have a defined weight at 35%, which I believe would create the curve I'm after..

Am I even close?


Old in age, not in mind, so
'Teach me something new'!

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ron_o
Moderator



United Kingdom
1052 Posts

Posted - October 06 2014 :  15:09:30  Show Profile Send ron_o a Private Message  Reply with Quote
Hi ODR

Well it looks like it's down to the two of us.....

Where did you get your "known " values from ? I'm somewhat confused by the "per 1% moisture" part.

ron
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Kudzu
Administrator



USA
1619 Posts

Posted - October 06 2014 :  16:59:55  Show Profile Send Kudzu a Private Message  Reply with Quote
Hey ODR,
Will this type of info be of any use for what your doing ?

You must be logged in to see this link.

=========================================
I still think the only dumb questions are the one's you didn't ask ...
=========================================
Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety.

Benjamin Franklin
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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - October 06 2014 :  17:00:52  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
My info comes from You must be logged in to see this link.

With all my research, into so many things, I find their values to be conservative, but very close.
I check a few others and again their very close.

Using their Density per cubic ft, transferred it to per cubic inch.
Since that's the way I'll be dealing with it.

I set up the spreadsheet using their numbers and checked it against what should be 20% or less wood (a sort of known, figuring 2 seasons in 15-18%, measured 17% on all).
Numbers worked in weight.
Checked it against my MC reader and it comes close, then against my DMM (dc resistance), using the adjustments for temp and species,, still very close.

So I like their values.. so far (why I doubt, just too inquisitive I guess)

That's where the numbers come from.

Trying to keep my seat in the middle of the class Ron.








Old in age, not in mind, so
'Teach me something new'!

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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - October 06 2014 :  17:06:44  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
Absolutely!
I have some more reading to do..
I already saw, with a quick glance, some interesting factors.
Thank you for being involved with my quest.
With any luck, it will help again another.


quote:
Originally posted by Kudzu

Hey ODR,
Will this type of info be of any use for what your doing ?

You must be logged in to see this link.

=========================================
I still think the only dumb questions are the one's you didn't ask ...
=========================================
Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety.

Benjamin Franklin




Old in age, not in mind, so
'Teach me something new'!

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ron_o
Moderator



United Kingdom
1052 Posts

Posted - October 06 2014 :  17:33:40  Show Profile Send ron_o a Private Message  Reply with Quote
Hi ODR

Based upon the density calculation equation as given in the Engineering Toolbox site you will be ok to "extend" your graph

ron
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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - October 07 2014 :  17:22:03  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
Thank you RonO!

I have built the graph/chart and will now see if it's linear or a curve involved.
I have a few pieces of size I'll be able to test against.

The theory is to take a reading using weight and the graph/chart.
Then halve the split and halve it again and do another read by weight, MC and DMM by reading the quarter and mid points.

I'm assuming if all readings do not match (which I figure they probably won't), then averaging the reads should be close.

I assuming if the readings are close, then it's probably linear and I can use the graph/chart.
If they're quite a bit off, then a curve is involved.

Am I looking at this right?

Old in age, not in mind, so
'Teach me something new'!

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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - October 07 2014 :  17:24:41  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
@Kudzu:
There is some great base info in that article I haven't come across before!

Again, thank you!

Old in age, not in mind, so
'Teach me something new'!

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ron_o
Moderator



United Kingdom
1052 Posts

Posted - October 08 2014 :  15:09:13  Show Profile Send ron_o a Private Message  Reply with Quote
Hi ODR

Given that wood is a "natural" product and the method you are employing to establish it's moisture content it is i fair bet that you will not get a straight line graph from the two extreams of moisture content ( exponential curve "ish" ) but it should be reasonably straight towards the lower moisture content levels.

If you look at the heading "Model" ( approx half way down the article ) you will see that the equation contains a Natural Log function , hence a curve

You must be logged in to see this link.

Hope thats of use to you

ron
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Kudzu
Administrator



USA
1619 Posts

Posted - October 08 2014 :  17:14:51  Show Profile Send Kudzu a Private Message  Reply with Quote
Hey ODR,
Your welcome ...
I like to read and try to grasp all the project's that y'all are working on ( although, most of em just go over my head ) ...

=========================================
I still think the only dumb questions are the one's you didn't ask ...
=========================================
Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety.

Benjamin Franklin
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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - October 08 2014 :  17:49:50  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
Here we go:
Sorry guys, I had inverted some of the info..



Edited by - olddawgsrule on October 09 2014 15:04:52
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