My training
blades start out as a slab of uniform solid material. At this point it could just as well be destined
to be made into gears or bearings, but here it will become functional art, a
rare blend of strength and balance to enhance your martial art training.
The
first step is to measure dimensions for a particular blade, to cut a board off
of the slab. If there is a template, I
can just tape off a rough dimension, making sure I leave enough edge to work
with later. I use a table saw for these
initial cuts. It’s more stable than my
old circular saw but also less intuitive.
A large wood bandsaw might make more precise cuts. At this point what I have looks nothing like
what it will become. It’s just a rectangular
block of material.
Next
I go to the router table. This is the muscle
machine in the shop. If I’m copying a
template, I use double-sided tape to attach it to the workpiece. I have an overhead pin arm to trace the
template while the router blade cuts the piece underneath. That lets me see where I’m going and helps
keep my hands safe.
Templates
are made freehand from designs traced or taped onto fiberboard, which is much
cheaper. This gives me greater freedom
to experiment with designs, saving the prime materials for the final
products. It’s almost as much work to
make a template as a real piece. There’s
no beveling, but it has to be really smooth.
Any errors will get copied onto production pieces.
The
2-1/2 hp. router blades spin at up to 25,000 rpm as the workpiece is pushed
into the bit. This can be dangerous,
especially if the bit grabs the piece and shoots it across the room. For heavier cuts I’ll use clamping sleds
that exert hundreds of pounds of pressure to hold my workpiece. This keeps my hands at a safer distance from
both blades and workpiece while giving me greater control. I plan to keep my fingers!
Once
the shape is cut, I can make light passes without the sleds to smooth the form,
as there is little material being cut and therefore less resistance and
danger. After this I’ll separate the
template from the workpiece
Now
I change bits to round off the edges, so it’s safer to handle the
workpiece. I’ll trace the entire
circumference of the piece, on both sides.
If I’m doing a 24” sword, that’s four passes (top and bottom, left and
right sides) for 96”, plus a few more for the width of the guard and
pommel. For simplicity, let’s say it’s
100 inches of circumference on a piece this size, half that on a knife. (Do you know that Japanese sword refinishers
charge by the inch to sharpen blades? And
that’s some serious coin there …)
The
first part I finish is the handle, as this is where blades are meant to be
held. The feel of a blade is through
the handle, and so working forward from there allows fine-tuning the balance of
the whole piece as it progresses. If
I’m comfortable with the shape of the handle, it may already be 90% finished,
but work on the blade has barely begun, requiring multiple passes on several
machines.
A
24” kris has an 18” double-edged blade which will require 2-3 bevel cuts on
each of the four surfaces to get them clean and even. I’m still using the overhead pin to follow the contours of the
blade, but as edges angle back from cuts on one side I have to be careful to
adjust my depth when doing the second side, and without letting the guide pin
touch the cutter. Bevelling bits aren’t
cheap, running $50-100. The depth of
the cuts at this point will determine the edge width, weight and balance of the
sword.
The
hardest part to do is the tip, which can easily chip on the router. Stock is best cut by feeding into the router
bit, minimizing grabbing. One side of
the sword is easy to do this way, pulling from handle towards tip. The opposite side, however, leads in tip
first, which is a difficult feed and subject to chattering on the cutter. I need to hold the piece and have to be especially
careful not to ruin the project at this point.
CNC machines move their cutters over fixed stock, which is stabilized by
leaving points connected until the final cut.
That’s extremely accurate. I’m doing
the opposite, manually moving the stock over fixed cutters, which has different
benefits and problems.
Examining
the blade at this point determines what is required next. Tool selection goes progressively from
larger, more powerful machines down to smaller, more precise options. If there are rough spots or flaws that the
router cannot fix, I may go to a slack belt sander or coarse hand files. Sanders work quickly and leave a smooth
finish but don’t always blend cleanly with adjacent areas and are to large and
powerful for small spots. Next is a
Dremel tool, which can do many jobs, from detailed shaping and decorative cuts
to texturing and engraving. At this
phase it would use a drum sander.
Files
are where the detailing really begins.
I use a variety of sizes and shapes.
For modifying the overall shape of a piece or erasing tooling marks I
may need a large mill file or circular rasp, used carefully so as not to leave
deep gouges. Cleanup and finishing use
either regular or diamond needle files.
Though both types are the same size, the cuts are different between
them.
Once
I begin handwork, it’s important to move smoothly because file blades establish
a pattern of grain in the surface.
Consistent direction of movement has a natural and organic flow, whereas
crosscuts with a file will not. How
much work is done at this level depends on my goals for the piece and how
accurate I was earlier with the machines.
The
end is in sight as I bring out the finish.
The blade is polished with sandpaper, progressing from180 grit up to 600
or even finer, continuing to bring out the grain. Finally the blade is buffed with a sequence of wheels and buffing
compounds to bring out the shine and create a rich and lustrous finish.
I
generally leave the handles a little rougher, using grip shape and some
texturing along the thin width for a good hold. I like the handle to feel and look different from the blade so I
don’t polish this part out; a satiny feel is warmer and more wood-like to my taste. On Chris’ sword
I went further, finishing the project with a “basketweave” pattern on the sides
using the Dremel. This is time
consuming, an option and not a necessity.
Right
now an estimate on time for a piece, start to finish, ranges from at least two
hours for a knife up to six hours for a sword.
This depends on size, single or double edged, and level of detail. I’m hoping with experience to cut this time
frame down; it’s not economical to spend a whole day on a sword, but that is
what it takes right now.
* * * * * * *
Here’s
a synopsis of the work. Many steps
needs tooling changes which are part of the time estimates. I also have to stop to vacuum up chips and
dust for health and safety, even with a collector running, or else debris can
get so thick I cannot see the workpiece.
1)
Measuring
and cutting the blank on the table saw; 2-4 cuts (5-15 minutes)
2)
Set
up template, rough cut shape with router; 2-4 passes (20-30 minutes) Vacuum router table between passes (2-4
minutes each time)
3)
Edge
rounding on router; 2 passes, top/bottom, (10 minutes) Vacuum after all
4)
Dremel detail shaping and texturing thin
width of handle (5-10 minutes) Vacuum
5)
Re-edge
handle with router if necessary (2 passes) (1 minute – router still setup)
6)
Bevel
cut the blade; 2-4 passes each side, 2x for double edges (20-30 minutes) Vacuum router table on each pass (2-4
minutes each time)
7)
Belt
sanding blade (0-15 minutes) Vacuum
8)
Decorative
cuts on guard (bandsaw or Dremel) (5-10 minutes)
9)
Filing
blade (30-120 minutes, depends on shape)
Vacuum +/- 10 minutes
10)
Sanding
blade (15-40 minutes)
11)
Buffing
(10-15 minutes)
12)
Optional
handle engraving (60-120 minutes)