2011
C-Base
Transmission Assembly
Produced by
Ed Latimer, Team 476
Ken York, Team 476
Ron Markum, Team 1750
Transmission Assembly Instructions
This PowerPoint contains instructions for assembling the transmissions
from the 2011 C-Base frame kit from AndyMark, Inc. It is meant to be
supplemental to the User Guide that is included in the 2011 AndyMark kit.
AndyMark 2011
C-Base
Transmission
Assembly
Press Bearing into Housing
There are 2 bearings in the
transmission kit. The unflanged
bearing with the smaller (3/8”) hole
goes in the CIMple Box Housing.
AndyMark User Guide
Pg. 10, Step 1
It is preferable to insert the bearing
with an arbor press, but it can be
done using a block of wood and
hammer. Tap the bearing in, making
sure it is going in square and is
bottomed out in the housing.
Properly installed bearing.
Install the Output Shaft
AndyMark User Guide
Pg. 10, Step 2
Insert the output shaft in the bearing.
Grease and Insert the Big Gear
AndyMark User Guide
Pg. 10, Step 3
Put grease around the edge of the big gear and insert it over the output shaft as shown.
Press Bearing into Shaft Plate
The bigger bearing (1/2” hole) goes
in this plate. It is a flanged bearing
and must be inserted into the plate
from the side shown in the picture.
AndyMark User Guide
Pg. 11, Step 4
Again, it is preferable to use an arbor press,
but a block of wood and a hammer can be
used. Tap gently and make sure the bearing
is going in square. Continue until the flange
of the bearing is flush with the plate. The
bearing will stick out the other side.
Mount Shaft Plate
AndyMark User Guide
Pg. 11, Steps 5&6
Slide the shaft plate over the CIMple housing as shown. The shaft is a snug fit.
Install a 10-32 nylock nut into each of the 4 corners of the CIMple housing and put a 10-32
x 5/8” cap screw through the 4 holes in the shaft plate. Tighten the screws down evenly.
Install Gear on CIM Motor
AndyMark User Guide
Pg. 12, Step 7
1. Insert the piece of 2mm machine
key into the keyway on the motor
shaft. Then slide the gear down the
shaft around the machine key.
2. Get the 5/16” retaining ring and
start it on the end of the shaft. Then
see the next slide for details on how to
get it in place…….
3. It is a little tricky to get the
retaining ring on. The ring has to
fit over the ‘bump’ created by the
machine key sticking out of the
keyway slot in the motor shaft. It
will only fit if the ‘gap’ between
the retaining ring teeth goes over
the machine key. If you get one
of the retaining ring teeth (that
sticks down) caught in the groove
of the shaft’s keyway, it is tough
to get the tooth out of the groove.
If that happens you are better off
pulling the retaining ring off and
starting it on the shaft again.
See the next slide once it is
started properly…..
4. Once you get the retaining ring
properly started over the machine key,
get a socket and push the retaining
ring and gear down all the way until
the gear is almost touching the motor.
It should look like this
when you are done.
Mounting the Motor
AndyMark User Guide
Pg. 12, Step 8
Put the motor in in the housing and twist it until its gear meshes with the big gear inside.
Then rotate the motor until the screw holes line up. Put a screw through the shaft plate
as shown and screw into the motor.
A trick to keep the screw from falling off when you put it through the hole is to put a piece of
paper over the head of the cap screw and push the wrench on, as shown on the left.
There are two screws per motor,
180 degrees apart. Put in both
and tighten them securely.
Note that if you later want more
power for your robot’s drivetrain, the
AndyMark CIMple Box can
accommodate a second CIM motor.
Output Shaft
AndyMark User Guide
Pg. 12, Step 9
Note that in the AndyMark User Guide, at this point they just have you install the machine
key, adding the output sprocket later when mounting the transmissions in the Frame
instructions. For the RQBS, we suggest you put the sprocket on here since the
Transmission Team has a shorter task than the Frame Team. But it is your choice.
2. Slide the output
sprocket over the
machine key as shown.
1. Slide the black spacer over the
shaft against the bearing, then install
the 1/8” machine key in the keyway
of the output shaft as shown.
3. Put on the thin white
nylon shaft spacer, then
the ¼” washer, and then
the ¼-20 x ½” screw.
Tighten the screw.
The transmission assembly is now finished and is
ready to take back to the Frame Team for mounting
on the frame and installing the chain.