Parts to be Removed Tank Tread Building Guide

TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Start with the build completed in Lesson 3 of the TETRIX® Getting Started Guide.
Steps 1-7 and 13 involve removing elements from the model. Some of them will be reattached later.
Step 1
Parts to be Removed
1x Switch Plate
Assembly
4x 1/2" SHCS
Tips
• Take care to ensure wires don’t get tangled.
• The switch plate can remain dangling and unattached at this point.
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4x Kep Nut
Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Step 2
Parts to be Removed
1x Motor Assembly
with Drive Wheel
2x 1/2" SHCS
2x Kep Nut
Tips
Make sure to disconnect the wire from the motor before removing it.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Step 3
Parts to be Removed
1x Motor Assembly
with Drive Wheel
2x 1/2" SHCS
Tips
Make sure to disconnect the wire from the motor before removing it.
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2x Kep Nut
Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Parts to be Removed
2x Omni Wheel
2x Axle Hub
Step 4
2x 100 mm Shaft
8x 1/2" SHCS
4x Bronze Bushing
2x Shaft Collar
Tips
• Make sure to keep the shaft collars and bronze bushings in a safe place when removing the wheels.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Step 5
Parts to be Removed
1x Servo Controller
2x 3/8" BHCS
2x Kep Nut
Tips
Make sure to unplug the battery before making changes to the electrical system.
• A 5/64" hex key will be used to remove the Servo Controller.
• Make sure to disconnect the black cable that connects the Servo Controller to the DC Motor Controller. A small flathead
screwdriver will be required to loosen the wires.
• The battery can be put aside, after it is disconnected, in order to make changes to the chassis.
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Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Parts to be Removed
Step 6
4x 3-Module Connector Peg
with Friction
Tips
• Set the pegs aside in a safe place. They will be added again later.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Parts to be Removed
Step 7
1x NXT Mount
Assembly
Tips
• Do not disassemble the LEGO® elements that are used as part of the mount.
• Disconnect the sensor and motor controller cables if necessary. Keep track of where each was connected.
• Set aside the whole assembly; it will be added again later.
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Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Step 8
Parts Needed
1x Switch Plate
Assembly
4x 1/2" SHCS
4x Kep Nut
Tips
• It might be necessary to rearrange some wires or unwire and then rewire the switch to move the plate to the rear of
the robot.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Step 9
Parts Needed
2x 32 mm Channel
4x 1/2" SHCS
4x Kep Nut
Tips
• Make sure to put one channel on the very last set of holes and the other in the middle of the other two channels.
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Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Step 10
Parts Needed
2x 32 mm Channel
4x 1/2" SHCS
4x Kep Nut
Tips
• Make sure that the channels on both sides of the robot are aligned.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Step 11
Parts Needed
6x Idler Wheel
6x 100 mm Shaft
24x Bronze Bushing
12x Shaft Collar
6x 3/8" Axle Spacer
Tips
• Add an idler wheel, as shown above, and then repeat for the remaining five channels.
• Depending on the TETRIX® set, use either the 1/16" or 5/64" hex key for the shaft collar set screw.
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Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Step 12
Tips
• Tighten the set screw to couple the shaft collar with the axle, keeping everything in place.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Step 13
Parts to be Removed
2x 3" Wheel
8x 1/2" SHCS
Tips
•
•
•
•
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This step uses the assembly set aside in Step 2.
Remove the four screws and set them aside to be used in the next step.
Remove the wheel from the motor, but do not remove the motor hub.
Repeat for the other motor that was removed.
Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Parts Needed
Step 14
2x Tank Tread
Sprocket
8x 1/2" SHCS
Tips
• After adding the sprocket, use the four screws that were set aside in Step 13 to fasten the sprocket to the motor hub.
• Repeat for the other motor.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Step 15
Parts Needed
2x 1.5" SHCS
1x Motor Assembly
with Sprocket
2x Kep Nut
Tips
• Note that the motor assembly is not to be mounted directly above the middle idler wheel.
• Make sure to use the longer 1.5" screws to reach all the way through the channel.
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Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Step 16
Parts Needed
2x 1.5" SHCS
1x Motor Assembly
with Sprocket
2x Kep Nut
Tips
• Note that the motor assembly is not to be mounted directly above the middle idler wheel.
• Make sure to use the longer 1.5" screws to reach all the way through the channel.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Step 17
Parts Needed
1x Servo Controller
2x 3/8" BHCS
2x Kep Nut
Tips
• Make sure to use the smaller 3/8" screws.
• Align the servo controller in the same orientation as the DC motor controller.
• Make sure to connect the two controllers as seen in the wiring diagram at the end of these building instructions.
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Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Parts Needed
Step 18
1x NXT Mount
Assembly
Tips
• Slide the NXT Brick and its mount into place.
• Note that it is now facing the opposite direction from how it initially was.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Step 19
Parts Needed
4x 3-Module Connector Peg
with Friction
Tips
• Use the four pegs that were set aside in Step 6.
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Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Note: This step is optional. If the rubber traction elements are not available, continue without them.
Parts Needed
Step 20
148x Tank Tread Chain Link
148x Rubber Traction Element
(Optional)
Tips
• Inserting the rubber elements will add additional traction to the treads.
• It can be easier to insert the rubber elements using a bit of lubricant. Liquid dish soap or something similar works very
well.
• Note that the rubber elements can be added one in every two or three links if there are fewer than the full number
available.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Step 21
Parts Needed
148x Tank Tread Chain Link
Tips
• Use 74 links per side to assemble the two treads.
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148x Rubber Traction Element
(Optional)
Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Step 22
Tips
• Loosen one of the motor mount screws in order to rotate the motor within the hub.
• This will allow the treads to slide on.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Step 23
Tips
• Carefully slide the treads onto the set of idler wheels and the tank sprocket that is connected to the DC motor.
• Make sure the sprocket gets firmly interlocked with the tank tread.
• It might be necessary to rotate the mounted motor to provide more slack.
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Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Step 24
Tips
• This step introduces more tension in the treads and will prevent the treads from slipping off.
• After this is done, make sure to tighten the motor mount screw to prevent the motor from slipping in its hub.
Make sure not to add too much tension to the tread.
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TETRIX® Add-On Extensions
Tank Tread
Tank Tread Building Guide
Final View
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Tank Tread
TETRIX® Add-On Extensions
Tank Tread Building Guide
Wiring Diagram
Tips
• Tighten the screws on the HiTechnic controller after the wires have been inserted.
Complete all wiring before attaching the battery.
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