Learning OpenSCAD (work in progess)

-

Using the WikiBooks OpenSCAD User Manual Strandbeest (https://en_wikibooks.org/wiki/OpenSCAD_User_Manual/Example/Strandbeest), as a base, I reworked the code (it has lots of bugs) for a 4 Bar and add

3D offsets.

It is still a work in progress:

-

Here is a 3D GIF of a three leg walker (one side):

-

Removed the cogs and replaced with a side crank. Only one of the axles need to be driven:

-

Next is to add spacers or washer between moving parts:

-

Notes:

• The two colours Red and Yellow are inference fits to the rods. The other as sliding fits.
• The spaces are 25% of the plate thickness but this is not that important.
• The design has been changed to a "side-rod" drive. The two driven shafts are now centrally located.
• Now I need to design the motor mounts and the internal cargo space.

-

Update:

• Refactored the code to make creation more systematic and easier to debug.
• Replaced most of the individual spacers and shim code with a function and a list.
• Added cross-rod reinforcements and motor mounts (had to make the body a little longer).
• To coupling the motors to the drive rod, I will use a flexible tube.

-

Refactored the code and removed hacked code. Now able to rebuild with parameters except for the stepper motor. Cool to be able to shop online for some Teflon washers and adjust the walker for the washer thickness that was available. 

To do:

• Controller board mounts.
• Battery mounts.
• Sensor mounts.
• And more.

AlanX