Monday, October 2, 2017
How much is an "RCH"?
I was putting Zeus out on the line this morning when I saw a hank of corn silk had fallen from the drying rack onto the walkway.
That served as a memory jog. There is science to be done.
How much is an RCH?
It is unclear if Red Corn Hair (henceforth RCH*) refers specifically to the color of the corn or to the hair, or silk as it is sometimes called.
The reason that "RCH" is used is because of its near infinite flexibility. For instance, it can be used as a length dimension, the width dimension of a single item or of an assembly...and the actual dimension will be different!
The actual width of a single RCH is 0.011 millimeters or 0.0004 inches. This is nonsensical in the context of carpenter work because there are no tools that can shave such a small amount off the width.
Wood measured and cut in the morning usually loses moisture throughout the day and will be slightly smaller when nailed into place. This trend reverses itself if it starts to rain.
Finish carpenters use the tight RCH method. According to exacting research by the crack, ERJ team the precise dimension of a tight RCH is 0.0245 inches.
I hope you found this essay useful, or if not useful, then entertaining.
*Some people who are less refined than Eaton Rapids Joe use a coarser term than Red Corn Hair. If you are one of those people, I don't want to hear it. This tries to be a family-friendly blog.