On Tuesday, February 10, 2015 at 11:16:11 AM UTC-8, Dan Coby wrote:
If I care about alignment (usually do, in any jig), I predrill and drive
one nail as a pivot, then glue the piece into position. When the glue
is set, before using the assembly, I predrill and screw along the glue
joint so it won't break. Optionally, also remove the nail...
This allows me to get good results even with hotmelt glue (which
allows later disassembly for adjustment). Predrilling is key, a bit
of woodgrain can cock a sheetrock screw badly, and has some
effect even on shanked woodscrews.
I have seen the same thing happen in various situations,
where putting a screw in the center pulls a piece out of
line. It's always better to work from one end to the
other, or from the center out to both ends, than it is
to do the ends and then the center.
I bent down and looked under the sled and saw the single screw I had
placed in the center area of the fence. As soon as I removed that
screw, the bow disappeared and the fence is now once again flat across
As others have suggested, too small a pilot hole and 3/4" stock
requires screws to be dead nuts on center, which leaves very
little for error.
SFWIW, I use 75% of full body dia for pilot drill dia.
Haven't stripped a screw yet.
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