Bending leg spacer first step.
Bending leg spacer second step.
Bending leg spacer third step.
56 SERVO 09.2009
Bending leg spacer fourth step.
go into that assembly here, as that will depend on the legs you
Note how we’re supporting and separating the two chassis plates
with chassis spacers. The spacing is critical, as these plates make up a
“sandwich” with the servo motor horn and the opposing ball bearing
in the middle. If you use different sized servos, plan to adjust the
length of the spacers to match (sometimes a nut or washer or two will
do it). Our standard servos (HS475) in the Lynxmotion legs require a
spacer length of 1.875”.
If you’re good at bending brackets, the recommended pair of ‘C’
shaped brackets with hole patterns to match the chassis servo horn
holes should be used in the back. This gives much more room for the
battery (perhaps even a bigger battery) as the rear two hex spacers
can be left out. Your choice!
Strider’s quad chassis is designed with cutouts and holes for
mounting a BB2 or SSC- 32 board either both on top or with the
SSC- 32 board below. I opted for this arrangement. Alter the holes and
cutouts if you use other board(s). The battery should go aft and low,
if possible. There are also 1/4” holes for power switches fore and aft.
Mount the SSC- 32 board on the lower chassis plate using 4-40
hex spacers, mount the legs, and wire the servos at this point (see
diagram). It is much easier to wire the servos before bolting on the top
chassis plate. The legs can be dropped into the 6 mm bearing holes in
the lower chassis plate, and will more or less stay put while you wire
them. You’ll find it’s easier to just unbolt the top chassis plate when
you need to make changes associated with the SSC- 32 after assembly.
With the servos all wired up, bolt on the chassis spacers and leg
brackets. After that, align the legs and bolt up the top chassis plate
and the BB2 board. The BB2 needs a connecting two-wire jumper
(usually provided with the BB2 or SSC- 32) to the SSC- 32.
Wire the batteries and switches. I charge the 6V battery by
unplugging it from the bot and then connecting my charger, so you’ll
want to make the battery connections accessible from the rear of the
bot. The 9V battery can go wherever you want; I attached mine with
Velcro. It’s a good idea to have multiple battery packs, especially when
demonstrating your bots. It makes them easy to remove/replace. I’ve
also wired up the three LEDs to pins P0, P1, and P2 as indicated on
the wiring diagram. This leaves P12-15 free for use with the PS2. Next,
wire up the PS2 receiver and secure it with Velcro or double sticky tape
to the chassis, or to a shelf above the BB2. I used pre-made jumpers
to connect it up to the BB2. Wire the PS2 as indicated in the wiring
diagram to P12-15. Alternately, you can use an RS-232 cable or Blue
Smirf module to control the bot instead of the PS2 (as mentioned).
Servos and Legs
One thing you’ll want to watch is the orientation of the servo
All the CAD drawings, as well as the .BAS files are available for download at
Basic Atom 5. 3 PS2 program
Basic Atom 5. 3 COM (RS-232) control
Basic Atom Pro 126.96.36.199 PS2 or RS-232 control
Mbasic Pro 5.2 program PS2