WOODWORKING QUIZ for 28 May 04

[Ralph Jones]

Good Evening Friends,
What is meant by the term casehardening?

Respectfully,

[forunna]

That would be the callous that forms on your forehead when you keep falling down after drinking a case of beer.

[AlexS]

In metalworking, it's hardening the outside of an iron piece by heating it in a carbon-rich medium such as leather or sawdust. In timber, its the outside hardening of kiln-dried timber while the inside is still softer & moister.

[RETIRED]

Generally caused by transporting uncovered timber on open trucks.

[Ralph Jones]

Good Morning Friends,
Case hardening is a defect in the lumber caused by improper drying. Case Hardening is caused when a board is dried too fast. the outer layers in a case hardened board are compressed while the inner layers are in tension.

Thank you for your support.

Respectfully,

[ozwinner]

Generally caused by transporting uncovered timber on open trucks.

No,no,no. thats how they season the timber, delivering it to your job on the truck.

Al

[RETIRED]

You could be right judging by some of the timber I have had from suppliers.

[AlexS]

Once upon a time I lived near a pine mill. After the timber was milled, they kept the moisture content constant by spraying it with water. Nowdays, they wrap it in plastic before it gets a chance to dry out. Is it any wonder it does what it does!