90 ton 1/14 metal excavator scratch build w/embedded PC

[SteinHDan]

The body goes together by using eight M3 threaded rods, four self-tapping screws and two M3 machine screws.

First M3 nuts are inserted into slots in the counterweight parts:






Then the threaded rods are screwed into the nuts:





The rear doors slide onto the threaded rods, and are attached with an additional two M3 20mm long bolts:








The front doors also slide onto the threaded rods. They are attached to each other in the middle by three M3 bolts and locking nuts. This attachment is the bridge that holds any weight on top of the house body.






Finally the tanks and the steps slide onto the threaded rods:




For these two parts, there are four additional self-tapping screws that attach the tanks and steps to the front doors:




At the end of the threaded rods, there are M3 nuts countersunk into the end of the front parts. Since they are completely inside the part, a socket screw driver is needed to fasten them:

[SteinHDan]

I made a somewhat improved snap-in hinge pin assembly. I should have used some longer bolts, but I didn't find any.

The assembly consists of two M3 20mm bolts, one compression spring and an aluminum tube to hold it straight:






The hinge pins are then snapping into the holes in the sides of the lid opening in the body: