The chassis is realized by a lasercut service and can be in wood or plastic. The first version of the chassis was 3 mm thick, then 4 mm thick and now the v3.1 is 5 mm. Why? The more the thickness, the more the robustness.
Main bases
The main structure of the chassis of MyzharBot v3.1 is composed by two main horizontal bases.
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- Main Bases and Spacers
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- Main Base – Bottom
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- Main Base – Top
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- Base Spacer
The bases are separated by three spacers which fit in special slots as illustrated.
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- Main bases spacers
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- Main Bases and Spacers
The top base has a big hole to fit the motor encoder and to let the cable to be connected to the electronics suited on the bottom base. There are also two lateral rectangular holes, they are needed to let to the sprocket on the axis of the motor to rotate freely.
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- Big hole and cables
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- Top Big Hole
On the sides of the bases are made special cuts that make it possible to constrain the horizontal structure to the basics of the vertical support to the tracks.
These cuts are composed of a long rectangular shape perpendicularly interrupted by two shorter ones. The longer rectangle receives a M3 bolt, in the perpendicular cuts you insert one or two M3 nuts so at to completely fix the structure.
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- Nut and Bolt fixing
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- Nut and Bolt in the prototype
The two horizontal bases are also designed to fit completely inside the track structure to add robustness to complete system.
Track bases
The tracks of the robot are suited on two “triangular” structures composed by two vertical bases spaced by three lasercut spacers.
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- Track Bases
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- Track Bases Spacers
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- Track Internal Base And Spacers
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- Track Bases And Spacers
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- Track Base – Internal
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- Track Spacer – Long
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- Track Spacer – Medium
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- Track Spacer – Short
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- Track Base – External
The inner bases works as motor support and are designed to suite a Micro Motors model e192-12-18, that control the main sprocket of the tracks (the smallest)
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- Internal Track Base and Motor
Both the bases has two holes that support the structures of the bottom axis of the triangular structure of the tracks. The holes fit the flanged gearings of the axis.
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- Track Hub and Bearings
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- Base and Hub
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- Base, Hub and Sprockets
The bottom axis support the bigger sprocket that trasmit the motor power to the soil by the tracks.
The two basis are separated by three lasercut spacers studied as to give more robustness to the whole structure. The three spacers are provided with protrusions to get caught in external bases and mounting structures similar to those described for the main horizontal bases.
The tracks are composed of 30 single modules jointed togheter and suited on the three couples of sprockets. Each module is large 3” (76.2 mm).
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- Track
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- Track on Sprockets
Full assembly
As told the main basis are designed to fit completely inside the track basis.
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- Main Bases inserted in the Internal Base of the Track
And the full structure can be made more robust using four aluminium bars.
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- Support Aluminium Bars
Finally everything can be assembled together to have a complete MyzharBot v3.1.
The size? Length: 42 cm, Width: 36.5 cm Height: 16 cm
The weight? More than 2 Kg
