Spur II build

Well this was Spur. It was my first featherweight and in general happy with it

http://i1184.photobucket.com/albums/...t/SDC11537.jpg

Good points
- Chassis was solid. It used 10mm HDPE but the corners were joined with angle iron and had a 3mm base. You didn't want to drop it on your toe!
- Traction. It used 4 drill motors with 100mm blue wheels with mountain bike tyre. The tyre had a nice open tread and wear rate was low
- Its a lifter and the linear actuator was very powerful

Bad points
- The wheels were exposed so vulnerable. It got slipped once landing on a wheel wrecking the gearbox
- Linear actuators have no give. So landing on the forks meant the forces had to go somewhere. Generally into bending the forks

So after getting my axe robot into a working state, and learning a bunch from steel chassis bots, I have decided to build a new Spur imaginatively called Spur II

I wanted to keep the bot nice and small. This allows me to use weight in a more flexible manner.

Key objectives
- good traction
- protected wheels
- strong lift but able to withstand shocks i.e. flips
- able to go full combat

Steel is more unforgiving so went for drawing and templating the steel before cutting

http://i1184.photobucket.com/albums/...ps90ab4329.jpg

http://i1184.photobucket.com/albums/...ps1f22e2b1.jpg

So this is the basic layout

http://i1184.photobucket.com/albums/...ps95ac4302.jpg

Its tight inside but enough space for the important bits

I've got the steel templates cutout

Currently 4mm Hardox sides. The chassis plate is 3mm but looking to move to 4mm as well

http://i1184.photobucket.com/albums/...ps319423fd.jpg


Just need to buy a welder to put it together :D

The lift motor is from an AEG 18V cordless drill I picked up cheap from ebay
Its a monster but the gearbox is 2 speed and general quality seems very good
I'm building this on a self contained frame for maintenance. It will chain drive the front end lifter mechanism

http://i1184.photobucket.com/albums/...ps6fdb77f8.jpg

have you left enough space for the esc's

Yep - 3 TZ85a. They line up nicely under the battery
I might move one under the lifter motor. Enough wiggle room to decide in a bit

How is the AEG 18V getting its power to the forks? There seems to be very little space

Chain and sprocket

A 14 tooth sprocket on the motor (welding onto the shaft)
The lifter will be a 17mm shaft running in needle bearings with sprocket welded on there again

So will the chain go around one of the Gimson drive motors?