Tomorrow, I start a new project making a blanket chest with Beth actually a
different Beth than last time. Before she comes, I want to work out a way of handling long
boards on the new table. It has a super sized table, but the boards I will be edging will
be 48"long, so I want to make a jig.
To start, I install my 1/2" pattern bearing bit. It has a cutting
height of 2" so it will work even with the jig board being 3/4" thick.
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I want to make the jig
as a "permanent" fixture, but I also want to make use of scrap pieces where I
can. I am trying a long length of 3/4" melamine to see if it fits in the router
table's miter gauge track. It does with just a little "slop". That doesn't
concern me when I use the jig, I will just have to remember to keep pressure
forward.
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I measure the
distance from the leading edge of the slot to the cutter of the bit. It is 5 3/4". I
will place a dado at 5 7/8" so I can route the last bit off.
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I have setup my table saw
with the stacked dado set for cutting a 3/4" wide slot. The depth is set at
3/8".
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I have ripped
the white melamine strip to be the width of the dado here and the depth of the miter slot
less a hair. I do not want the jig to ride high at all.
I am brushing in carpenter's glue. I will use a couple of screws from
the top but do not really expect them to hold much in the core of the composite. The glue
will do the trick.
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I have predrilled and
countersunk for the 1" screw. I do not want any of the head above the surface. It
would scratch the project wood.
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The inset close-up shows me
routing off that 1/8" that I had left. When I have completed this cut, the edge will
represent the exact cut line. By the way, the board is 56" long to have room
for clamps to hold down 48" boards.
Note that I have brought the fence forward and have clamped it to about
1/2" behind the cutter. I am not using it as a guide, but I do want the vacuum to
suck up the MDF dust. It does that well.
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I take a piece of 220 grit
paper to smooth off the little fuzz from the top surface. Actually, the MDF machines very
well. It will be a good edge to use as a final guide.
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I am trying out some clamps
that I want to use on this jig. These hold downs are very inexpensive and, I think, will
be more than satisfactory. I have a piece of 48" T-track that I will mount in a dado
that I will cut on the top surface of the jig. I will cut the T-track in half and leave
the center portion without.
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I have cut a dado for the
T-track to fit it snuggly. There are screw holes pre-drilled in the track but with only
3/8" of MDF under the track, I think my best bet will to be use 2-part epoxy. I am
applying it "liberally". I do not want these T-track sections to lift out.
Once dried and cured, I think this jig will be outstanding for what I want to
use it for. I will spray it with a coat or two of polyurethane. I don't want the MDF to be
absorbing moisture.
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