off, you just gotta love any hobby that justifies getting a Mill and
Lathe. I picked both of these up along with bits, tools cutters,
collets, and all the "little things" for just over $1500
from KBC Tools brand new:
The first task was
to make the 6 parts that would slide in the channels.
The channels are 1/8" x 1/4" brass rectangular
stock, with a slit cut into them with my handy Byrnes Model
I started to make these out of
Aluminum, but the slit I needed in these was too small for the mill,
so I made them out of Delrin instead, so I could use the saw.
The rest was cut on the mill, and when they were done, I boiled them
in Black RIT Dye for about 10 minutes. Everyone was amazed at
how black they turned out!
The blue part above was
milled from half of a T-Rex 450 washout arm. It already had a
ball bearing mounted, and was the perfect size (why re-invent the
wheel?). I now look through my LHS's supply of "little
aluminum parts" (Thanks John & Sparky from Gearbox) looking
for parts that are "almost right" as it is easier for me to
modify than make from scratch!
The upper arm was more
complex, it required a drop-down that I made on the lathe out of
aluminum rod, as well as a U-shaped linkage to clear the door when it
swings out to open (like the side door of a van). After screwing
up about 4 times in Aluminum (very slow), I punched these out in
Delrin in about an hour. Delrin is much easier to work with
(with a whole WEEK of experience on the mill), and it has the virtue
of being a "Self Lubricating Part" (gee.. I had a
girlfriend with one of those).