Posts: 4,751
Threads: 0
Joined: Aug 2006
Got an idea and think I read about it somewhere.
It's a stick for measuring humidity.
2 strips of wood glued together. Different species, or grain direction.
When humidity changes, the stick bends, because of different woods.
Anyone have a link to article, or suggestions?
Thanks
I long for the days when Coke was a soft drink, and Black and Decker was a quality tool.
Happiness is a snipe free planer
Posts: 2,037
Threads: 0
Joined: Jan 2003
Sounds interesting, and I have nothing, sorry
Posts: 22,004
Threads: 0
Joined: Oct 2003
Don’t you live in Florida?
Just put your head outside; you’ll know the humidity changed.
Gary
Please don’t quote the trolls.
Liberty, Freedom and Individual Responsibility
Say what you'll do and do what you say.
Posts: 41
Threads: 0
Joined: Sep 2007
(06-05-2020, 07:34 PM)Pirate Wrote: Got an idea and think I read about it somewhere.
It's a stick for measuring humidity.
2 strips of wood glued together. Different species, or grain direction.
When humidity changes, the stick bends, because of different woods.
Anyone have a link to article, or suggestions?
Thanks
I think that is a great idea if you can calibrate the deflection at different humidities, at least in the range of interest.
Posts: 18,639
Threads: 0
Joined: Jul 2006
Location: Milwaukee area
I got nothing other than it sounds like a neat project.
Cross-laminations of a single species may be doable, if thin enough (think veneers?)
Could lookup woods that are most and least reactive to moisture changes?
Posts: 20,950
Threads: 0
Joined: May 2005
(06-05-2020, 07:34 PM)Pirate Wrote: Got an idea and think I read about it somewhere.
It's a stick for measuring humidity.
2 strips of wood glued together. Different species, or grain direction.
When humidity changes, the stick bends, because of different woods.
Anyone have a link to article, or suggestions?
Thanks
Believe Hoadley's book shows a rip not quite through a board displaying end grain with the opposite sides closing/opening. Too lazy to dig it out to get the page in my edition.
Better to follow the leader than the pack. Less to step in.
Posts: 2,201
Threads: 1
Joined: Oct 2003
Other than a bendy piece of wood, I am not sure you’d be able to measure much. Wood also expands as a function of heat. Without knowing the temp you couldn’t tell if the expansion was a function of increased moisture content or increased heat.
Posts: 21,259
Threads: 2
Joined: Mar 2009
Location: IA
06-06-2020, 12:27 PM
(This post was last modified: 06-06-2020, 12:31 PM by Arlin Eastman.)
As of this time I am not teaching vets to turn. Also please do not send any items to me without prior notification. Thank You Everyone.
It is always the right time, to do the right thing.
Posts: 711
Threads: 0
Joined: Oct 2007
Location: N. Illinois
06-06-2020, 12:41 PM
(This post was last modified: 06-06-2020, 12:47 PM by rectangle618.)
(06-05-2020, 07:34 PM)Pirate Wrote: Got an idea and think I read about it somewhere.
It's a stick for measuring humidity.
2 strips of wood glued together. Different species, or grain direction.
When humidity changes, the stick bends, because of different woods.
Anyone have a link to article, or suggestions?
Thanks
This looks close to your description:
https://www.youtube.com/watch?v=B9FPBQzlhbc
OK for a Cub Scout project, but Arlin's suggestions would be more practical.
Mike B.
One thing is for certain though. Whichever method you use, you can be absolutely certain that you are most assuredly doing it wrong. Axehandle, 2/24/2016
Do not get in to much of a hurry buddy... Arlin, 5/18/2022
Apology excepted. TT. 2/25/20223
Posts: 7,581
Threads: 0
Joined: Jan 2005
Location: New Zealand
(06-06-2020, 12:41 PM)rectangle618 Wrote: This looks close to your description:
https://www.youtube.com/watch?v=B9FPBQzlhbc
OK for a Cub Scout project, but Arlin's suggestions would be more practical.
I think that's how you would do it. One strip is long grain, so it wont change length enough to matter. The other strip is cross grain, laminated to end grain. That can move. I think it's also a good demonstration of why you don't glue up cross grain joints, and you probably have to chose a glue with a little bit of flex. If you scaled the stick up too much the cross grain movement would probably bust the stick at some point, but a small piece like that can bend enough to hold together.
The small piece can also change moisture fast enough to predict the weather, not just the season.
It's something that you would make as a novelty, and it shows how wood does move with humidity.
