T-Hex Chassis Assembly

Step 1.

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Step 2.

Use the 4-40 x 1/4" hex socket screws to attach the spacers to the side of the right chassis panel.

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Step 3.

Attach the “C” brackets and the Offset brackets to the chassis as shown. Use two 2-56 x .250" screws and 2-56 nuts for each bracket. You do not need to use any 2-56 nuts on the front brackets. Note, to prevent damage to your battery, make sure your screws are facing outward.

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Step 4.

Use the 4-40 x 1/4" hex socket screws to attach the left side of the chassis to the spacers.

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Step 5.

The SSC-32 should be configured for 115.2 kbaud and DB9 communication, with the VS2=VS1 jumper installed. Remove the VL=VS jumper. Consult the SSC-32 manual if needed. Attach the wiring harness to VS1. Connect 8" of 24awg wire (not included) AND the 9v battery clip to VL; this will provide power for the electronics. Make sure that the red wires go to (+) and the black wires go to (-). For now, put some electrical tape on the end of the wire. Using four 4-40 x 3/8" hex socket head screws, attach the .75" hex spacers to the board as shown.

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Step 6.

Slip the SSC-32 in through the hole in the side of the robot and use four 4-40 x 3/8" hex socket screws to attach the board as shown. Make sure the DB9 port on the board is at the back of the robot, away from the power switch hole! This will ensure you can easily plug in a DB9 cable. Install the power switch in the power switch hole as shown.

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Step 7.

Using four 4-40 x 3/8" hex socket head screws, attach the 1.0" hex spacers to the board as shown.

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Step 8.

Slip the Bot-Board in through the hole in the side of the robot and use four 4-40 x 3/8" hex socket screws to attach the board as shown. Make sure the DB9 port on the board is near the top of the robot! This will ensure you can easily plug in the DB9 cable.

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Step 9.

Attach all legs. Be sure they are oriented as shown.

You will need to make one small adjustment to the legs. Remove the servo horn screw from the servo. Pull the servo horn off the servo, rotate the leg two ‘clicks’ (30°) outward and reattach the servo horn and screw. Note, the Hitec spline has 24 grooves, so each groove is 15°. The middle legs do not require adjustment.
Note: Photo shows the robot’s right side.

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Step 10.
thexsch2.gifPlug the servos into the SSC-32 as illustrated in this diagram. Simply plug in the servo associated with the function to the corresponding pin. If oriented correctly, the I/O port (group of four pins) will be closest to its corresponding leg.

Refer to the following to “decode” the above table. If you do not have a 4DOF leg, then simply ignore the ankle pins.

First letter:
Left
Right

Second letter:
Rear
Middle
Front

Third letter:
Horizontal
Vertical
Knee
Ankle
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This completes the mechanical assembly of the chassis.