1. There should be an adjustable "foot" like on a sewing machine to hold
the material down on the table.
2. You may be feeding the material too fast
3. Blade may be too coarse for the thickness of the material.
My first jigsaw - a $50 craftsman - did that too. A good blade (e.g. Bosch
Progressor's) helped a little. Gentle hands helped a little. Selling it at
a garage sale and buying the Milwaukee 6266-22 Jigaw fixed the problem for
good. No more jumpin'...
Wow! You took my story! Exact same experience. What puzzles me is
that I don't understand the mechanism that would cause such behavior in
such a seemingly simple mechanism. Would a blade shaft that had play in
it cause such behavior by causing the blade to be pulled up and then
pushed down in a random fashion, thus having the blade come down upon
what, in a well-machined shaft's case would be cut wood, but in the
shaft with play partially upon uncut wood?
:) Nice thing was - SWMBO is almost *never* out in the gar^H^H^Hshop. But
last year she wanted to Jigsaw something and was getting pretty annoyed with
the Craftsman. Garage saled it the very next weekend, grabbed the Milwaukee
and then brought her back out for a return try. Scored a nice point on the
before/after experience. She understands that sometimes it *is* the tool.
I have a B&D saw, even with a decent blade it still jumps around anf doesn't
cut decent at all. The mechanism inside flexes too much, I thought it was
the blade bending until I looked closely, it lets the blade angle inside
the cut and creates too much friction.
Providing the machine runs fairly smooth without stock being cut. The blade
needs to be installed with the teeth cutting direction down, otherwise even
with a moderate amount of hand pressure downward on the material being cut,
the stock will lift off the table and cause the jumping.
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