It's 1/thou, not 1/10k. 1/thou is within a couple thou of the maximum difference in expansion.
How I keep my wood from over expanding and shrinking is by using aged woods. My red cedar (what my stash box is made of) was cut down multiple years ago and stored at my grandfathers sawmill, it was then milled 2 years ago to 3/4 rough. I hold them in my shop for over a year before I plane them, then another 6+ months before I use them. All that time, the moisture has stabilized (theoretically), so the only expansion and contraction would be through temperature, which has a much smaller effect than moisture.
I have had some of my wood products expand in shipping, but after a week of them sitting in a person's home, they will be back to normal. That was my vape cart holders. So after a few people said when they arrived they couldn't use them. I started milling them a little looser.
How I keep my wood from over expanding and shrinking is by using aged woods. My red cedar (what my stash box is made of) was cut down multiple years ago and stored at my grandfathers sawmill, it was then milled 2 years ago to 3/4 rough. I hold them in my shop for over a year before I plane them, then another 6+ months before I use them. All that time, the moisture has stabilized (theoretically), so the only expansion and contraction would be through temperature, which has a much smaller effect than moisture.
I have had some of my wood products expand in shipping, but after a week of them sitting in a person's home, they will be back to normal. That was my vape cart holders. So after a few people said when they arrived they couldn't use them. I started milling them a little looser.