You do know that pretty much everybody except you guys in the US has
been measuring things in metric for a Very Long Time... Right?
So... if you a) import or b) export you're pretty much required to use
metric even if you pretend otherwise domestically... Right?
IIRC the 3/4" plywood is actually 23/32", that is very close to 18 mm, about
1/64" over. I have at least bought MDF on 3 different occasions where I
still a piece laying around over the past 8 or so years. The MDF
consistently measures out at. 97/128", that is actually wider than 3/4" and
that does not convert evenly to metric.
Rules to follow.
You should always index off of the surface that you want to show. If your
pieces are not exactly the same thickness and you index off the inside, the
outside will show the difference and if you are using 45's for the corners
the difference will be magnified. Indexing of the outside surface on 45's
may be more difficult with the DeWalt. The PC fence is designed so that
you index off the outer surface and use different thickness pieces
ALSO, do not use a table surface to index off of. The plate joiner fence
should always support the machine when cutting in to the edge of a board.
If you use the work surface to set the plate jointer on and there is debris
or your stock or work surface is not perfectly flat the slot will not be cut
It is best when cutting a slot into narrow stock to clamp the stock down
with the end or edge that is to receive the slot to hang over the end of the
work bench. You do not want there to be a chance that the plate jointer is
not being fully supported fully by the fence, for accurate indexing.
I was OK with most of your rules, but I disagree
with the one below.
Yes... it's true that if the stock is slightly
different thickness, using a flat table top as
a reference edge "might" cause a problem, but
using the fence on the jointer is also problematic.
Most folks will not hold the fence perfectly flat
on the surface of the material that is being cut.
I think you are better off using the table saw
top and fence as your work surface.
Assuming the pieces are "slightly" different
thickness, put the "good" side face down and
make your cuts.
This will insure that the finished version is
going to match up a lot closer to flush.
The PC 557 has a "adjustable" fence and I suspect
that you can very easily NOT get in back to the
correct 90 degree angle, which would cause another
whole set of problems.
Your mileage may vary.....
From the way I understand it you should be using some stop blocks to
really hold the pieces in position. When you go to make the slots the
force of the cutter will slide the piece even if your holding it
really tight. Stop blocks will help in keeping it center where you
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