Structure INDEX 1. Constructing a Chassis 2. Standoff Posts 3. C-Tubes
1. Constructing a Chassis
Set two 288 mm channel pieces side by side with the open end of the U-shape facing down. Set two more 288 mm channel pieces across the first two, but with the open ends of each ‘U’ facing up.
Align the holes of the top channels to the holes of the bottom channels where you’d like them to be. At each corner, drop four SHCSs down through the four small holes on either side of the large hole.
Thread the kep nuts on the end of the screws. Using the 7/64” hex wrench, tighten the screws. Repeat these steps for the other three corners.
The TETRIX building system includes 1” and 2” standoff posts which can be used to connect pieces of channel and provide separation between components when needed. Standoff posts can also be used to elevate subassemblies, such as grippers and other components.
Attaching Standoff Posts Standoff posts are internally threaded, allowing SHCS’s to screw directly into them. Slide a SHCS through the hole where you want the standoff post to be located. Spin the standoff post on the SHCS to secure it.
Align the hole of the other component with the other side of the standoff post. Screw a second SCHS through the component and into the standoff post to secure it.
3. C-Tubes
C-Tubes can be used many ways as part of the structural body of the robot. For example, they can connect two sides of a chassis or be used as an extension.
C-Tubes also make a strong and lightweight lever arm. You can attach them directly to a servo horn or a gear. Try attaching a gripper, sensor, or other end effector on the end of a tube – run any wires inside the tube to hide them and keep your robot design clean.
By attaching one end of a tube to a servo and the other to a gear, the gear will have the same rotation as the servo (servos in the base set come with 180° rotation).
You can mesh a different-size gear to the gear on the tube to create a different rotation. For example, attaching an 80-tooth gear to the tube and meshing it with a 40-tooth gear will provide a 2:1 ratio, giving the 40-tooth gear a 360° rotation. Note: Be sure the gear is supported at the end of tube: without support, movement of this lengthy assembly could cause stress and shift that might break the servo horn off at its shaft.
Attaching C-Tubes Insert a tube into a tube clamp. Insert a 5/16” SHCS on the unthreaded side of the clamp. Be sure not to overtighten this or you might bend the tube end.
To attach a tube to a structural element such as a channel, align the element’s holes with the clamp holes. Insert 5/16” SHCSs from the underside of the element and tighten.
To attach the tube to a servo, align the clamp holes with the servo horn holes and secure them with 5/16” SHCSs.
To attach the tube to a gear, attach a tube clamp to the other end of the tube and secure that end to the gear with screws.
You can then secure the tube and gear to your servo assembly.
Cutting C-Tubes Using a marker, make a line on the tube where you wish to cut it.
Adjust the wheel of a tubing cutter so the tube can fit into the cutter. With the tube fitted into the curved side, line up the mark on the tube to the small wheel blade in the cutter. Adjust the wheel so the cutter is snug – but not too tight – on the tube.
Twist the cutter around the tube several times. Tighten the wheel a little and twist the cutter several times. Continue to do this until the tube is cut in two pieces.
Use sandpaper to smooth off any burrs where the tube was cut.
Standoff Posts. 3. C-Tubes. 1. Constructing a Chassis. Set two 288 mm channel pieces side by side with. the open end of the U-shape facing down. Set two.
moving parts damaged by contact with mis- aligned components. 2. Mechanical Safety. Never drive a smaller gear with a larger gear. Doing so. risks exceeding ...
... pivot bracket opposite the horn over. the bearing and align the bracket hole to it. Page 3 of 7. TETRIX grippers & actuators.pdf. TETRIX grippers & actuators.pdf.
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The screws in the TETRIX system are fastened with. kep nuts, which feature a toothed side. The toothed. side should face toward the screw head so the teeth. can 'grab' onto the metal. When building with the TETRIX system, it's best to. wait until all
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1x Touch Sensor D. 1x Power Switch E. 1x TETRIX DC Motor Controller F. 3x NXT Wire G. 1x DC Motor Wire H. 1x TETRIX Battery Pack I. 1x Battery Connector Wire J. 1x DC Motor Mount K. 1x SHCS 6-32 x 1.5 L. 1x Hex 6-32 KEP Lock Nut M. 1x Allen Wrench N.
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