|Project by linjay||posted 01-29-2016 10:36 PM||755 views||0 times favorited||4 comments|
The dark wood in this item is roasted maple. The light wood is curly Maple.
I made a jewelry box (http://lumberjocks.com/projects/181466 ) with similar materials. In the write-up I mentioned that after maple is roasted it isn’t really maple anymore. The roasting process makes it quite brittle and can also initiate internal shrinkage cracks. One of the roasted maple strips in this lap desk actually fractured about 3 weeks after it was finished. The fundamental driving force was probably uneven expansion between the two materials. But regular maple would normally tolerate these stress levels.
A contributing factor could be that this strip had a very small cross section—about 3/16’ X 1/4”. The 2nd picture shows this fracture in more detail. It goes right across the piece from one glue line diagonally across to the other. The cause of the fracture also could be due to an initial fault in the material which propagated—bad luck. So far the jewelry box top has not had any fractures. The cross section in it is about 3/16×3/8”.
-- It's easy when you know how - but that's the hard part. Ontario, Canada