Part 3, Assembling the parts

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• Part 3 - Assembling the parts
• What you’ll need for week 3
• Clean up the parts
• Add the Unpowered wheels to the chassis
• Add the Battery
• Cut the wire
• Solder the motors
• Add the Motors to the Chassis
• Add the Wheels
• Add the Tracks
• Add the Range Finder
• Add the Arduino & Motorshield
• What you’ll need for week 4

Part 3 - Assembling the parts

What we’ll cover this week:

• Cleaning up the 3d printed parts
• Assembling the 3d parts
• Cutting the wire
• Soldering the motors
• Attaching the battery
• Adding the motorshield

Here is a link to the Keynote presentation as shown in the video.

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What you’ll need for week 3

For this week’s Assemble the parts session:

• The 3D Printed parts
• A 9v Battery
• A 9v connector
• 2x 150RPM 6v Motors
• HC-SR04 Range Finder
• Some red & black wire (20cm each)
• A Soldering Iron
• Some Solder (and Flux)
• Arduino
• Motor Shield
• Some Filament - for the track joints

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Clean up the parts

Use files & sandpaper to clean up the parts

Remove any support structures from the prints Sand any surfaces that are rough with really light sand paper Use a file to ream the wheel centre where the motor spindle will fit Pay attention to the bottom of the chassis wheel stubs, they need to be smooth

Add the Unpowered wheels to the chassis

Its a revolution

• Check the wheel stubs and the unpowered wheels to ensure they are free of any protruding parts that will catch
• Force the unpowered wheel onto the stub
• It will be a tight fit initially, spin it a couple of times to allow friction to smooth any imperfections away
• Repeat for the other unpowered wheel

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Add the Battery

Power Up

• Add the 9v Battery connector to the battery
• Place the battery inside the chassis

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Cut the wire

Measure twice, cut once

• Cut four lengths of wire: 2 black and 2 red, 15cm each
• Remove 1cm of the plastic covering from each end to reveal the bear wire
• Give the wires a little twist to keep the strands together

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Solder the motors

There is an ‘L’ in solder - lets pronounce it!

• I’m Dip the ends of the wires in flux
• ‘Tin’ the end of each of the four wires with solder - add a touch of solder
• Thread the wire through the motor terminal, this makes it a stronger mechanical join if the wire is pulled
• Touch the solder and soldering iron to the terminal and wire
• Repeat x 4 (twice per terminal, per motor)
• Twist the motor wires together, this keeps them together and adds extra strength to both wires

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Add the Motors to the Chassis

Lets Ride

• Push the Motors into the Chassis - it should click into place
• Thread the wires through the centre of the Motor Holder
• Press the Motor Holders into place

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Add the Wheels

This bit is wheelie good

• Push the unpowered wheels onto the stubs - this might need some force
• Push the Powered Wheels onto the Motor pins - pay attention to the orientation the flat part of the spindle

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Add the Tracks

Time to add some grip

• Place two tracks together, push a piece of 1.75mm filament through the hole and cut with pliers
• You will need 16 track pieces per side
• Leave one piece of filament longer to make removing easier
• If the track is too tight you may need to print some track pieces with a 10% scale on the Y axis

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Add the Range Finder

Lets give the Robot a face

• Push the Range Finder module in the Range Finder Holder
• Slide the Range Finder Cover over the Range Finder Holder
• Slidde the Range Finder Holder onto the Chassis

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Add the Arduino & Motorshield

This Robot is assembled, (no disassemble)

• Slide the Arduino into place on the chassis
• Add the Motorshield to complete the Robot Assembly

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What you’ll need for week 4

For next week’s Wiring up the electronics session

• The assembled robot with motors
• The range finder module
• 4x Dupont wires
• 9v Battery Connector
• 9v Battery
• Motorshield