BUILDING A PLYWOOD GP35
PAGE 7 - TRUCK SIDEFRAMES
JUNE 8, 2014
[home]
[previous page]
The truck design on the previous page has rollers to keep the locomotive
stable.  We will have a different system on the other truck so it can sway side to
side to deal with uneven track.  It will be installed with steel washers at the
truck pivot.
I found a nice drawing of a Blomberg B truck on the internet (above) and
enlarged it on a copier (below), in this case at 333%, to get a 14-inch
wheelbase.
We copied a pattern from the copy and drew the basic truck frame on 3/4 inch
plywood.
It took about 25 minutes to make all the cuts on the bandsaw, but it turned out
well enough to be worth the effort.
Here are the 13 pieces that go into one basic truck sideframe.  The spring
hanger was cut from 1/2 inch plywood, and the squares, circles, and washers
from 1/4 inch.
Everything is glued together.  The elliptical spring and its support were made
from solid pieces of wood from a 2x4 using a table saw at a 14 degree blade
angle.
The sideframe is now painted and installed.  There are still several
details to add, but at least it looks a lot better for the time being than
plain wheels.
[next page]