INTRO

The attachment of the three middle braces (1, 2 & 3) and the crank assemblies was shown in the previous page (1-3). This page shows the attachment of the two Y-frames, the central torso brace and the lower crank motor braces.

These are located approximately where the arrows are indicating below.

When completed it will look like this:

PARTS

List of components presented in this page:

• Y-frame, LHS (#15)
• Y-frame, RHS (#16)
• Central torso brace (#17)
• Lower crank motor brace, left (#18)
• Lower crank motor brace, right (#19)
• M3 socket screw, 10mm (x8)
• M3 csnk socket screws, 10mm (x2)
• M3 nut (x12)
• M3 washer (x12)

Exploded view shown below.

The new parts are shown individually below:

The image below shows the 3D printed central torso brace with captive M3 nuts. This was printed in black PLA at 40% fill and 150 microns layers

Nb this should be printed as oriented above with support on the build plate only. Take care when removing the support material. As stated elsewhere none of the space-frame parts are very strong until they are all bolted together.

ASSEMBLY

The Y-frames (LHS & RHS) are attached to the forward facing lugs of the upper crank mechanism motor holders as shown below (red arrows).

*Nb: a design update…The inner motor holders now have captive nuts to make assembly easier (as explained previously; website to be update later):

M3 socket screws x 10mm long, M3 washers and nuts are used throughout except where the Y-frames (16, 17) join middle brace 3, where a countersunk M3 screw (10mm) is used (orange arrow below):

At this point the lower crank assembly motor holders are not attached to the central torso brace (17). This will be done with the lower crank motor braces (18, 19).

When that is completed, repeat on the other side (part #19 -mirror image of #18).

Next is to attach the two hips (left, right) and the ‘belly rod’ and then to build up the space frame to form the belly construction. This will be done on page 5.