Robot Quick Build Session
Transmission Assembly Instructions
Produced by
Ed Latimer, Team 476
Ken York, Team 476
Ron Markum, Team 1750
Special Thanks to
Oklahoma State University
College of
Engineering, Architecture,
and Technology
Transmission Assembly Instructions
Step 1 – Watch the instructional video for assembling
the Tough Box transmission on www.andymark.biz
Step 2 – Proceed with putting the transmission
boxes together. You can use the video in ‘pause’
mode, or you can use this presentation.
Parts and Tools Needed
for One Transmission Box
The small shaft goes in
the bearing without any
small holes around it in
the cover.
The side of the bearing
with the ridge faces up.
The smooth side of this
big gear faces up
Use the non-mar hammer.
Note: If none available, tap
with a regular hammer
using a block of wood as a
cushion.
The side of the small gear with
the raised hub faces up.
The side with the
raised hub faces up.
A regular hammer can
be used to put the Cclip on the shaft.
Apply a small amount of grease to the
gears. Excess grease can spin off and
might ruin the plastic cover’s finish.
Spread the grease around
by turning the gears.
Install both bearings with the
ridge side facing down.
Snap/push the cover down over
the bearings.
Tighten the bolts using a medium clutch setting on the
cordless drill.
Note: Install the 2nd bolt on the opposite corner of the 1st
bolt to pull down the cover corners evenly.
Make sure the shaft spins free
or you’ve made a mistake.
Repeat for the 2nd box.
Gather these parts and assemble
as follows.
Square keystock fits
between prongs in clip.
Push on with a
nutdriver or socket.
Repeat for
2nd motor.
The two ‘open’
holes in the motor
plate line up with
the screw
passage holes in
the cover.
Use the screws with thread-lock coating to
mount the motor. Start the first screw but
don’t tighten it yet.
Put in the second screw
and then tighten both of
them.
Repeat for the 2nd motor but make a
‘left’ and ‘right’ facing transmission box.
Sprocket from
kit of parts
Gather these parts and
assemble as follows.
Make sure the
gear teeth are on
the outside.
Be sure and use the
washer as it keeps the
sprocket from sliding off.
Repeat for 2nd box.
Leftover parts from each transmission box for an
optional 2nd motor and 2nd sprocket in case you
want to add them later.
The bottom mounting bracket goes on the
side closest to the output shaft, the side
opposite the motor. Take off the two screws,
put on the bracket, and re-tighten them.
The top mounting bracket goes on
the opposite side. Again, remove
two screws to install the bracket.
The motor should be
on the top half of the
box and the output
shaft on the bottom
half. Repeat for the
2nd motor.
Finished product, ready for installation on the frame.