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+-- Thread: Humidity stick? (/showthread.php?tid=7355750)
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Humidity stick? - Pirate - 06-05-2020
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
RE: Humidity stick? - toolmiser - 06-05-2020
Sounds interesting, and I have nothing, sorry
RE: Humidity stick? - Gary G™ - 06-06-2020
Don’t you live in Florida?
Just put your head outside; you’ll know the humidity changed.
RE: Humidity stick? - geraldonj - 06-06-2020
(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.
RE: Humidity stick? - Phil Thien - 06-06-2020
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?
RE: Humidity stick? - MichaelMouse - 06-06-2020
(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.
RE: Humidity stick? - srv52761 - 06-06-2020
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.
RE: Humidity stick? - Arlin Eastman - 06-06-2020
Use this
https://buythermopro.com/product/thermopro-tp-50-temperature-and-humidity-monitor/?gclid=EAIaIQobChMIvPyGrNrt6QIVDz6tBh31cAiQEAQYAiABEgJb4PD_BwE
Or this
https://www.lowes.com/pd/BestAir-1-oz-Humidifier-Treatment/50315959?cm_mmc=shp-_-c-_-prd-_-app-_-google-_-lia-_--_-humidifiers-_-50315959-_-0&store_code=2611&placeholder=null&gclid=EAIaIQobChMI24T-2dvt6QIVEQnnCh1kWwuPEAQYAyABEgJP0_D_BwE&gclsrc=aw.ds
RE: Humidity stick? - rectangle618 - 06-06-2020
(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.
RE: Humidity stick? - ianab - 06-07-2020
(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.