steminabox.com.au mouse trap racer construction...
TRANSCRIPT
9 X Mousetraps
9 X 3D Printed Chassis
8 X Spring Arm Mechanisms
4 X 100mm Dowel
4 X 200mm Dowel
6 X 480mm Dowel
18 X 40mm Acrylic Wheels
2 X 80mm Acrylic Wheels
12 X 120mm Acrylic Wheels
2 X 160mm Acrylic Wheels
2 X 120mm CD’s
2 X Vinyl Records
52 X M5 “Nyloc” Nuts
42 X M3X30mm Bolts
42 X M3X30mm Nuts
36 X 25mm Washers
9 X M5X120mm Threaded Bar (Rear Axles)
8 X M5X30mm Bolts (Front Axle)
8 X M5X40mm Bolts
40 X M5 X 50mm Washers
10 X 100X6.5mm Rubber Bands
20 X small zip ties
1m of 20mm heat shrink tube
1 X Roll of Builders Line
Tools;
o 1 X 8mm Spanner
o 1 X Small Locking Plier
o 1 X Phillips Screw Driver
Parts List
The mouse trap racers need only be assembled once and all
experiments can be conducted without any further modification except
for the swapping of the dowel spring arm.
Construction Tips:• 3D printed axle housings may need to be cleaned up slightly
• 3D printed axle housing must not have any compressive force from
axle lock nuts
• Wheels must be firmly compressed between locking nuts/washers
• Use a locking plier to hold axle while adjusting axle nuts
• All vehicles are weighted the same with 50mm washers to 270g
• “Disarm” the mousetraps by removing the metal arm/clip so that the
mousetrap cannot be “set”
There are two sets of vehicles that need to be constructed. One set is
the same except the rear single wheel increases diameter. The second
set of vehicles are the same except the wheel surface friction changes.
All vehicles (except the record album) are weighted to the heaviest
vehicle which is 270g.
Kit Assembly
Mouse Trap Racer Class Set2 X CD Wheels
2 X Acrylic Wheels
4 X Acrylic Wheels4 X Acrylic Wheels
with 2 X Rubber Bands
40mm Wheels
80mm Wheels
120mm Wheels
160mm Wheels
Vinyl Record Wheels
Single Axle
Dowel Spring Arms
Secure two 3D printed
chassis pieces together
with 2 X M3X25
Detach the
spring
retaining
mechanism
Drill holes
through the
mousetrap and
attach the
mousetrap to
the chassis
using 3 X
M3X25 bolts
and 3 X M3 nuts
Chassis
Attach the 2X 40mm diameter
acrylic wheels to the 3D printed
chassis with 1 X M5X30mm bolt
and 1 X M5 Nyloc
M5X30mm
bolt M5 Nyloc
2 X 40mm diameter
acrylic wheels
Front Wheels
Back Wheels
4 X Large Washers
- Inside and Outside of Wheels
M5 X 120mm
Threaded Bar
2 X 120mm Diameter
Acrylic Wheels
4 X M5 Nylocs
- Inside and Outside of Large Washers
NOTE: To bind the wheel to the axle, use
the locking pliers to hold the threaded bar,
and use pointy-nose pliers to hold the
inside Nyloc while you tighten the outside
Nyloc with the 8mm spanner.
Weight Vehicles to Heaviest Mousetrap
Attach the 3D printed spring fitting to the mouse trap
spring and secure with zip ties.
From the spring fitting you can either attach string
straight to the threaded bar or use a dowel spring arm.
Attach 50mm washers to the mouse trap racer
by using M5 X 80mm bolt and M5 Nyloc
NOTE: 4 Wheel
Acrylic Mousetrap
Racer
approximately 300g
(Excluding Vinyl Record Mousetrap Racer)
While the heat
shrink is still hot,
pull the string
down (away from
the top of the
spring arm) to
make it easier to
wind the
mousetrap.
Spring Arms
Attach string to
dowel spring
arms by tying a
knot. Ensure
the string
extends 15mm
beyond axle so
that it can bind
around axle but
free wheel later.
Attach 20mm
heat shrink to
compress
string anchor
point.
Construct 2 of the
750mm dowel
spring arms using
4 of the 480 dowel
segments and
tape- this allows
them to be taken
apart so that fit
back in the plastic
tub for storage.
Final Product: 4 X 100mm Dowel Spring Arms
4 X 200mm Dowel Spring Arms
2 X 480mm Dowel Spring Arms
2 X 750mm Dowel Spring Arms
