Thursday, February 16, 2017
The fiddleback is formed when the tree or part of the tree is under compression pressure. This particular tree had been blown over in a wind storm when it was much younger and then continued to grow twisting up towards the sunlight causing pressure were the tree turned upwards and grew larger. Sometimes this will occur when a tree growing in a forest becomes shaded by other trees, and as the tree grows it will twist and turn to find sunlight causing pressure where the tree bends. You can also find this type of pattern under large limbs that are putting pressure on the bole. Very often this pattern will not be visible through the bark. Look for the pressure points.
A bowl turned from wood near the break is pictured below, about 13 inches in diameter. Maple Bark on a natural edge will not stay on the edge of a bowl.
Other Species can also have this fiddleback grain pattern. Trees that grow on a ridge top or high point that is subject to winter storms tend to have a hard and tough grain. Trees that grow in lower protected areas tend to have a softer and more consistent grain. Trees that grow under the forest canopy and are forced to twist and turn to find sunlight will have some very interesting grain patterns.
Whatever wood grain or texture you encounter, I have the woodturning tools that will make your turnings come to life.
Thursday, February 9, 2017
This is the 6" Vacuum Chuck that I used on the Maple Bowl; the bowl is about 13 inches in diameter. Notice the hard plastic between the two o-rings, that is what leaves the mark. Larger Diameter o-rings might help the problem, but they will compress to seal the vacuum chuck to the bowl and the hard center will be in contact with the bowl.
Enlarge the picture and you can see the mark left by the vacuum chuck, just above the blue tape
I think my gauge is off a little bit, it should read close to 30 inches of vacuum, because I am near sea level.