I love this spider-like walking mechanism, spotted on the MAKE Flickr pool. Here are some of the deets:

The walking action uses the Klann linkage, specifically, configuration E006. The motors are Solarbotics GM17, from Technobots, which will generate a decent torque from 5v upwards, and a nice scurry at 12v. Pivot bolts are all M3x10 and x14 button head allens (MF-BH34S et al) & nylocs (MF-NN03S), from http://modelfixings.co.uk. Plus a 44mm bit of M3 studding. The gears are held onto the shafts with No.2 (2.2mm) by 6.4mm and 9.5mm self-tappers (MF-ST09). Motor mounts are M2.5×20. Gears are mod 1.5, 30mm pitch circle, 14.5 degree pressure angle. They’re designed with CamBam’s cog tool and cut from 6mm acetal sheet. Acetal is from http://www.directplasticsonline.co.uk/ The sheet thickness is a bit variable, so if you use our CamBam files make sure you adjust the cut depths for the sheet you have. This project was inspired by this cute little thing.


Gareth Branwyn

Gareth Branwyn

Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. And he has a new best-of writing collection and “lazy person’s memoir,” called Borg Like Me.

  • theophrastus

    really a bit more crab-like, no? or camel gait. very nice nonetheleastbitless

    • Gareth Branwyn

      Yeah, true enough, altho this type of walking machine is frequently called a “spider walker” or “spiderbot,” altho I agree, it’s really more of a crab gate. And they never have eight legs.

      • jarkman

        It really depends where the head goes, in my mind.

        This rig is only half the finished machine. I need two assemblies like this, one on each side, giving a roughly square footprint.

        If I put the head in between the two assemblies, looking in the direction of travel, it’s a spider.

        If I put the head on the side, looking across the direction of travel, it’s a crab.

  • anachrocomputer

    There are some still photos of the robot leg mechanism that I took at Dorkbot Dristol, in my Flickr set:


    They also show one of the acrylic pieces “as cut” by Richard’s CNC milling machine.