Kozo K27 Frame
The 3/8 x 2.5" x 8' bar has been
hacked up to the rough lengths of the various frame pieces. The center
two are the main frame members at about 20.5" long. The right two are
the rear frame
extensions which are approximately 12.25" long. The left two are the
front extensions that are over 11" long. January 4, 2017.
The frame rails have all been annealed
to help relieve stresses from the cold rolling of the bars. The bottom
one has gone through the first machining step of milling to length,
adding the rear frame alignment notch and alignment holes drilled. The
two main rails will be bolted together so that they can be machined
together to provide a precise alignment of all of the features. January
The second frame rail has been notched
and milled to length. In this shot the two frame rails have been bolted
together, note the key in the slot on the left end to keep them
aligned. Next up will be the drilling and machining of all openings on
the sides of the frame. January 11, 2017.
The corners of the various cutouts in
the main frame rails have been drilled. The driver centers are marked
with the long vertical lines with the upper corners drilled out for the
openings. The large diameter holes mark the corners of the large
cutouts that will be milled in the frame. January 14, 2017.
The front frame cutout has been
roughed out in this shot. The second cutout is in process with an added
complication of a couple of tabs in the center to be finished. Also
note that the back side of the cutout is angled. January 15, 2017.
The slots that outline the tops of the
driver openings have been completed. The first two cutouts in the frame
have been finished on the right side. Two more cutouts to work on which
are outlined by holes in the center and at left. January 21, 2017.
The frame rails now have the four
rectangular cutouts. The next step is angling the left edge of the left
three and once that is done it is time to start machining the bottom of
the frame. January 23, 2017.
The three frame cutouts now have the
back edge angled about 5 degrees. The tail has also been shaped where
the rear frame extension will attach. A small cut has also been made on
the bottom edge at the front of the frame rails. January 26, 2017.
The eight driver pedestal binders were
machined together to create a matching set by running two rods through
all of the to make one large block. One of them has been cut down to
the final thickness. Just repeat for seven more then it will be time to
add the holes to bolt them to the frame. Feb 12, 2017.
The eight pedestal binders have been finished to size and drilled for
the mounting bolts. Feb 18, 2017.
The bottom side of the main frame is
being machined to receive the pedestal binders. Here we see a binder
being test fit for driver number two. These need to be fit
before the remainder of the driver opening is machined as the frame may
warp while removing all of that material. If the frame does warp
it will be bent back into shape to fit the binder. Only three more
drivers to go! Feb 19, 2017.
All of the pedestal binders have been
fitted to the main frame and the driver cutout locations established.
The next step will be to rough out the driver openings and check for
any bending of the frame rails with the large openings cut out. Once
any frame warp is adjusted, the driver openings will be cleaned up to
accept the driver boxes. Feb 28, 2017.
The openings for the drivers have been
rough cut on this frame rail and all of the binder attachment points
have been tapped for the 4-40 hex head bolts. The next step will be to
mill the driver openings to the final dimension with the binders in
place to keep everything aligned. March 20, 2017.
The driver openings have been machined
to the final dimension. Next will be machining the four rectangular
tabs to final thickness and cutting off the alignment holes at each end
of the frame. March 27, 2017.
Both frames have had the driver openings machined and all drivers have
been test fitted in the frame. The four tabs are to be machined to
thickness next and then the frame machining alignment holes at each end
will be trimmed off. June 10, 2017.
frame will require front and rear extensions for the lead and trailing
trucks. The table is about 3' 6" wide for a size reference. June 11,
The leading truck transom was machined
today to provide a pivot point for the truck and frame rail
spacing. Note that as Kozo mentions, the dimension have to be altered
when using 3/8 stock for the frame rails vs the metric stock. June 24,