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

[SteinHDan]

The stick consists of these parts:
- Sides in 3mm aluminum
- Hubs in 12mm aluminum
- Gear motor (similar to the previous ones)



Again, the gear motor is mounted with 8 M5 countersunk bolts.






Mounting the stick onto the boom:

[SteinHDan]

The bucket linkage is milled from 12mm aluminum. The gear motor is driving the bucket through these links, so they need to be strong.

The pins are M8 x 80mm pins bought here:
- http://www.ebay.co.uk/itm/291511678072

[SteinHDan]

I've tried to construct a bucket without welding. It looks pretty ok and feels strong even if I've just printed it in ABS for now. I'll mill these parts in 10mm aluminum shortly. But I just had to print one to see how it fit. I think it's a little wide, so I believe I will make it a 5-teeth one instead of a 6-teeth one.

The construction uses a center slice that is tapped with M3 thread. All the other parts just have a 3.18mm hole in them.

10 M3 60mm long countersunk bolts are then inserted from each side, and bolt into the threaded center slice.

Bolts are added to odd-number holes on the one side and even-number holes on the other side.

The good thing about this approach, is that the width of the bucket can easily be changed. It would also be super simple to create a sifting bucket.

















Borrowing the cab from a Bruder CAT 320 1/14 to see how it will look with a cab on: