Copyright © Parallax Inc.
Product Name (#28106)
v2.1 5/5/2009 Page 2 of 4
Step 2:
The servo horn will need four of the holes enlarged for the 4-40 screws. The holes need to be
smaller than the screw so that when the screws are inserted they will make their own threads. You can drill
the holes using a 3/32” drill bit, or use an X-acto knife to enlarge the holes as shown below, depending on
which servo horns were included in your kit. If you are using the knife, be sure not to over-enlarge the holes.
By reaming with the knife a little from both the top and bottom, the hole will be more uniform in size.
3/32”
(2.2 mm)
3/32”
(2.2 mm)
Enlarge the Middle Holes
if using Disc Servo Horns
Enlarge Inner Holes
if using Standard Servo Horns
Step 3:
Using the ¼”
length screws, attach
the two large wheels
(with teeth) to the
servo horns.
Step 4:
Attach the 7/8” length screws and nuts to
the remaining wheels (2 large and 6 medium in size)
as shown below, and set aside.
Step 5:
Remove the wheels from your Boe-Bot. The servos should be mounted with the head toward the
rear ball wheel as in Figure 5. The servo mounting tabs need to be on the outside of the Boe-Bot chassis.
Confirm that the servos are mounted correctly. If your servos are mounted the opposite way, or are
mounted from inside the chassis, remove them and remount as shown.
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Servo head is mounted
toward tail wheel
←
Wrong Way
→
←
Right Way
→
Servo mounting tabs are
outside of chassis