Kozo K27 Brakes
This is one of a pair of brake hanger
brackets that will mount on the lower frame rail between drivers 2 and
3 to support the brake shoes for driver 3. Another shorter pair will be
required for the driver 1 brake shoe set. The brake shoes for drivers 2
and 4 are supported off of the frame fillers that were completed in the
spring rigging step. October 12, 2018.
One of the brake hanger brackets that will sit in front of driver 1.
November 12, 2018.
The four brake hanger brackets have
been completed. November 25, 20118.
One of the brake cylinders has been
turned to the final dimensions. A few holes will be required and
tapping for the rear cover and mounting holes on the frame side.
December 1, 2018.
The pair of brake cylinders have been
fully machined with mounting holes. December 8, 2018.
Covers for the rear of the brake
cylinders have been machined and attached. A hole is necessary in one
of them for the push rod that will attach to the mechanical brake
lever. December 9, 2018.
The two push rods for the brake cylinders have been machined and
threaded. These will be inserted inside of the cylinders along with a
return spring. December 10, 2018.
This shaft will run below the rear
frame section and connect the brake cylinders up to the brake linkage.
A small lever has been silver soldered at the center of the shaft for
connecting the linkage. The levers that will be on each end of the
shaft have also been started. These will connect up with the push rods
in the previous photo. December 16, 2018.
The brake cylinder levers have been
machined to the final shape. December 21, 2018.
The two brake cylinder lever shaft
fulcrums have been machined and will receive a phosphor bronze bushing
in the next step. December 22, 2018.
The phosphor bronze bushings for the
pillow blocks are done and the ends for the cylinder push rods have
been completed. A couple of 7/16 x 5" compression springs were
purchased at a local hardware store and trimmed down to about 2 inches.
These are hidden inside the brake cylinders and keep the brakes in the
released position. This was the first test fit of the brake actuator
assembly on the frame to check for a proper fit and everything lines up
as expected. The levers still need to be pinned to shaft. December 27,
The eight driver brake shoes will be
cut from this aluminum blank. The tread and flange grove has been cut
on the inside and the pivot point for each shoe has been drilled.
December 31, 2018.
The basic shape of the eight brake
shoes after a little bit of milling. The next step is to use a slitting
saw to cut out the shoes from the ring. January 5, 2019.
The eight brake shoes have been
trimmed from the ring and are ready for further machining. The pivot
bracket will need a slot for the hanger arm and a couple of minor cuts
in the bracket. January 6, 2019.
The brake shoes have been slotted for
the hanger, the hanger bracket ends have been shortened to make them
distinct from the shoe ends and a notch has been cut for the
positioning spring. January 13, 2019.
The 8 brake hander pins have been
machined which provide the pivot of the brake shoe hanger levers on the
hanger brackets that mount to the frame. The pins are 5/32" SS reduced
down to 1/8" on one end for the lever with a E-clip groove on each end.
The pins are extra long to allow the brake shoe to float from side to
side with movement of the drivers. February 18, 2019.