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Hand planing after machine jointing?

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Re: Hand planing after machine jointing?

#76

Re: Kiln vs. Air Drying, EMC and Finishes

Paul Barnard

>I think people are talking about two different things. There is an observable difference between kiln dried and air dried when it comes to steam bending. The kiln dried has a greater tendency to crack. This is a gross effect and is supposedly from the hardening of the Lignum that Russ refers to. The expansion/contraction due to moisture is a completely different process and is not effected by the lignum hardening AFAIK.

Could it be that you are all right :-)

Re: Hand planing after machine jointing?

#77

Re: Kiln vs. Air Drying, EMC and Finishes

William R. Duffield, on the Cohansey

>That is a very good possibility. In fact, it is an issue that is not addressed, AFAIK, in the articles I referenced. Hoadley does speak elsewhere of some of the other adverse effects, including case hardening, of improper kiln drying. I've experienced the disappointment of encountering brash wood hidden inside what appeared to be a beautiful, sound board. I'm wondering whether these adverse effects may be somehow in proportion to the "fast buck" mentality of some kiln operators, or just "failure to read and follow the instructions" for their fancy kilns. I know what overcooking (too long, or especially too hot) will do to a cake or a lasagna, so I expect something similar could happen to abused lumber in an improperly operated kiln.

Re: Hand planing after machine jointing?

#78

Re: Russ. I buy it!

William R. Duffield, on the Cohansey

>I hope you are not suggesting that people on this forum emulate that "purveyor of firewood in the guise of furniture," because if he continued with those practices, he might have put another meal or two on the table, but he would not have been in business for long.

If furniture were built like that, the likely effect would have been just as you described in our previous post, where the panel self-destructed from the inside out. Unfinished wood from the lumber pile that has not dried to EMC dries and shrinks more through the end grain. If you were to take this wood and joint a temporarily straight edge, when it finally did reach equilibrium, the center would have shrunk more than the ends, ending up with a concave edge. Intentionally adding a spring joint would make the problem even worse. In summary, that's a really bad reason to use a spring joint, and a good reason for taking the time to understand wood scientifically and also to understand the reasoning and the falacies underpinning traditional woodworking lore.

Re: Hand planing after machine jointing?

#79

Yar

Bill Houghton, Sebastopol, CA

>overcooked lasagna doesn't steam bend worth a darn.

Re: Hand planing after machine jointing?

#80

Re: Sprung joint beginnings theory

Bill Houghton, Sebastopol, CA

>A word usage question: isn't the proper term "lignin," defined on the online dictionary that popped up first on my Google search as "a complex polymer, the chief noncarbohydrate constituent of wood, that binds to cellulose fibers and hardens and strengthens the cell walls of plants"? Said dictionary didn't list "lignum," though it did list "lignum vitae."

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