I have long wanted a bench mortiser, and when the Delta 14-651 went on sale I
could no longer resist.
It was larger and heavier than I had remembered (I had not seen one in a
while). I did not want it in the way taking up valuable bench space
and it is too heavy (~60 pounds) and awkward to be moving around all of
the time.
I could relocate my clamp storage and install a shelf behind where my
jointer normally sits. I don't anticipate using the mortiser that often
so having to move the jointer once in a while is not much of an
inconvenience.
The steel building is bolted together. The 5/16" bolts are long enough
to allow the use of a rod coupler (a long threaded nut). Four
bolts would be adequate to hold the 2x4 shelf support to the side of the
building.
I laminated three pieces of 1/2" construction plywood to make a thick
sturdy shelf. The shelf was edged with oak.
A heavy-duty steel shelf bracket was used as a main support for the
shelf. I attached the bracket to the shelf and to the 2x4 with lag
bolts.
The bench mortiser has a very long lever. A good deal of force is
applied to the hollow chisel to force it into the wood. Besides the
weight of the mortiser, the force of the lever would place a heavy load
on a shelf. I wanted a substantial support member between the front edge
of the shelf and the building. It would need to clear an existing water
line, so it would need to be installed after the shelf was in place.
The shelf and supports were given two coats of varnish and then the
shelf was bolted to the side of the building.
Then the long front support and side supports were installed.
The water pipe is held in place by clamps bolted to the side of the
building. I made two supports for the sides of the shelf, which would
utilize the existing water pipe clamps. These supports prevent any
tendency for the shelf to twist. The side supports just wedge in place
and a small corner bracket holds them in position.
The mortiser fence is positioned with a rack and pinion mechanism. I
drilled a hole in the 2x4 support that allows the rack to travel an
additional 1-1/2". This allowed me to position the mortiser as close to
the building as possible, which also helps reduce the strain
on the shelf.
The shelf is set at 42" above the floor so the jointer (handles) would
fit under it. This is actually a better height for me than a workbench
and makes it easier to see the chisel positioning.
I made a test run, making a mortise and drilling a square hole. It works
well.
The mortiser is out of the way but easily accessible.