Monday, January 30, 2012

Power Saws

I wonder how many of us are friends with our band saw and consider it one of the most useful and versatile machines in the workshop? My 43-year-old Robinson Cadet is not only my favorite machine, but it is also capable of incredible precision. This may come as a surprise to those who consider that a band saw is a machine for coarse work only.

While considering the content of this article, I came to the conclusion that a good band saw is capable of coarse, medium and fine work, and this ties in nicely with our esteemed editor’s views on handplanes.


Coarse: Break Down Rough Stock
A good-size band saw can rip huge waney-edge planks, quickly disposing of the sapwood and bark. Wide boards often contain the pith at the center of the tree and many exhibit heart shakes. Cutting these planks up the center, into two manageable widths, is not a job for a table saw. The band saw is much friendlier and safer, as the flexibility of its blade will usually cope with the absence of a machined surface to ride on the machine’s table.


My machine has 20"-diameter wheels, so it should not be confused with small hobby benchtop models. I note that the band saw that is featured extensively in James Krenov’s book “The Fine Art Of Cabinetmaking” had 18" wheels. He states that it was capable of ripping 8"-thick hardwood, provided that a sharp, suitable blade was used.


Medium: Cut Then Refine
I do a lot of freehand cutting on my band saw, sawing perhaps 1/64" to a 1/16" away from a pencil line, depending on the circumstances. The small amount of remaining timber can be handplaned or machined quite quickly to achieve the desired result. For example: When using the band saw to make the long shallow triangular jigs that I use for dovetail cutting, the remaining stuff can be edge planed on the jointer with a few light passes.


Fine: Joinery, Veneer, Resawing
I have to confess that my handsawing skills are rather poor because I have not practiced as much as I have with planes and chisels. This is one reason I cut my dovetails on the band saw. The other reason is that my band saw cuts perfectly square every time.


Remarkably, the finish left by the .022"-thick, 3tpi, 5/8" “meat & fish” blade that I use for fine work and veneer cutting is just as good as that left by my best dovetail saw, even in 3/8"-thick hardwood. So from my point of view it is win-win – all the way to a good fit.


If you do small Krenov-style work, band sawing is almost the only way to do the female half of the signature bridle joints. These are so useful at the corners of delicate frames, for paneled backs and small doors.


Similarly, the face cheek of a tenon can be cut in exactly the right place after a few test cuts are made. Tenons are usually cut in multiples, and each and e...


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