INTRO

The upper crank mechanism assembly procedure was shown in the previous page (1). This page shows the parts of the space frame that are built up around just the top crank assembly.

This part of the construction is located approximately where the arrows are indicating below.

Once completed it will look like this:

3D model of the assembly shown below

PARTS

List of components presented in this post:

• top crank assembly (see previous page)
• rear cage (#9)
• L-shaped braces (left #10 / right #11)
• fasteners: none except a couple of cable ties

Below is the design and photo of the rear cage.

The rear cage is printed in PLA at 0.15mm resolution and at least 40% fill, with support on the bed only.

This was carefully cleaned up to remove all the support material. Tip: take your time with this using pointed nose pliers and snips to avoid breaking it. As mentioned elsewhere the parts tend to be quite vulnerable until they are all bolted together.

The photos below show the above rear cage attached to the lugs on the upper crank mechanism assembly that was shown in the previous post.

ASSEMBLY

M3 socket screws (x10mm), M4 washers and nuts are used (listed on previous page) to attach the cage to the top crank assembly.

Nb, a slight modification is that the inside motor holders (8) now have recesses for captive nuts

Here is the design for the L-shaped brace (left: the right hand version is a mirror image of it. The prints are shown below.

These were attached as shown below (the fasteners were included on page 1).

There are 3 ‘middle braces’ to attach next.