INTRO

The assembly of the front legs and claws etc was shown in the previous page (# 8). This page shows the attachment of the rear legs etc plus some struts.

These are located approximately where the arrows are indicating below.

When this stage is completed it will look like this:

PARTS

List of components presented in this page:

• Legs (41) (x2)
• Motor clamps (42) (x2)
• Claw spindles (43) (x2)
• Claw retainer (44) (x2)
• Claw washer (45) (x2)
• Hip stay, left (47)
• Lower hip stay, left (48)
• Rear brace (49)
• Rear leg strut (50) (x2)
• Lower hip stay, right (51)
• Hip stay, right (52)
• Motor-gearbox (200:1) [x2]
• Red electrical wire: 600mm
• Black electrical wire: 600mm
• black cable ties (x8)
• M4 socket screws x 30mm (x2)
• M4 socket screws x 25mm (x2)
• M4 socket screws x 20mm (x4)
• M4 countersunk socket screws x 10 (x2)
• M4 nuts (x4)
• M4 washers (x6)
• M3 socket screws x 35mm (x4)
• M3 socket screws x 10mm (x4)
• M3 nuts (x8)
• M3 washers (x6)

Exploded views (new parts coloured blue).

ASSEMBLY

The parts are shown below as they are assembled.

The first step is to create two more leg assemblies as shown on Page 8. (This is not duplicated here, although the parts are listed above).

The only difference is that the wires need not be quite as long and so 600mm of each colour has been allocated rather than 800mm. That is : 2 x red wires x 300mm and two x black wires x 300mm.

The following is the attachment (mainly) of the left side. The same steps are applied to the right side.

The front leg-mounting lug is attached to the left hip (20) using an M4 x 20mm socket screw as shown below.

Nb: a washer is not used (lack of space).

The M4 socket screw attaches to a captive nut in a recess on the reverse side of the hip (yellow arrow below):

Nb on p5 it was mentioned that the M4 nut should be placed in the above recess as there would not be room to do so later. If that was not done (for the left and right hips) then the screws securing the hips to the motor mounts and space frame will need to be loosened or removed to do this.

The rear brace (49) should then be printed and attached.

M4 x 30mm socket screws* (red arrows below) with nuts and one washer (on nut side only) are used to secure the leg, hip and rear brace lugs together. Tip: get all three in place before tightening any.

(*Nb: the 30mm screw is a little short but using a 35mm screw seemed a bit long so you can leave the washer off, if preferred, so that nut has better purchase on the thread of the nut).

The central rear brace lug attaches to the rear lug of the ‘rear cage’ (19) (yellow arrow above; nb, the socket screw, and nut -no washer- should be in place already -see p 2).

Nb the top tail lug will later on attach to the rear cage and the rear brace (yellow arrow above) so the screw and nut can be left loose but it might be helpful here to tighten them to give the device more rigidity and then to loosen later on when needed (Nb. as always, don’t over-tighten).

Next, print the hip stay, left (47).

The hip stay, left (47) shown above should be attached to the lower rear lug on the hip using an M4 x 20mm socket screw with nut and washers as shown below, orange arrow. (Do not tighten yet).

Nb there is a right way up and a wrong way up for this component.

The lower lug of this part attaches to the lower hip stay, left (48) (see below) and to the lower left lug of the tail (to be added on another page).

Next to add is the lower hip stay, left (48)

A captive M3 nut should be placed in the recess of the lug situated along the shaft length, as shown below.

Also to be printed and added is the rear leg strut (50; one for each leg assembly).

The image below is a close up line drawing of the left side, with the relevant 3D printed parts indicated (Nb one or two attached already).

The top lug (red arrow below) of part 48 will later attach to the tail base (#53, not shown) and the hip stay, left (47) but this has not yet been attached (red arrow below). Tip: it is a good idea at this point to attach an M3 x 10mm screw and nut to give it greater rigidity and strength (but these haven’t been added to the parts list for this page). It is best not to tighten the screws and nuts until all the parts are in place. As always, no not over-tighten.

In the image above, part 50 attaches to a lug along the length of part 48 using an M3 x 10mm screw plus washer and captive nut (green arrow). (The fasteners etc at the orange arrow are explained further below).

The three lugs indicated by the yellow arrow above are shown in more detail below:

The lower lug of part 48 (orange arrow above) attaches to lugs from the rear corner brace, left (23) (green arrow) and the belly rod (22) (red arrow) with an M3 x 10mm socket screw, a washer and nut. (These were added previously – see P6).

The other end of the rear leg strut (50) attaches to the lugs on the back of the motor clamp (42). This is done with an M3 x 10mm socket screw, two washers and a nut, as shown below.

The left side is now complete and you can now repeat these steps with the other leg assembly and using the following parts:

• Lower hip stay, right (51)
• Hip stay, right (52)
• Rear leg strut (50)

Once completed, route the wires along the space frame rods using the cable ties.

It doesn’t matter too much exactly how this is done as long as it is tidy and in any case when adding the tail and other wires it might need to be re-done in places.

The device should now look like this:

At this point it would be good to re-check that the leg motors are all working correctly. Tip: don’t worry too much about motor polarity, this will be worked out later.

Next is the tail (Page 10).