Sketch & Cad (updated 29/12/07)
due date: 15/12/07
Concept
After thinking about
various articulated lifter/flipper arrangements, I realised that it
would be best to keep it as simple as possible if I'm ever going to get
it built. For this reason I decided to go for a basic rear hinged
lifter but with the lifter arm capable of going all the way over the
top so that it could possibly act like a hammer too.
Concept evaluation
Since I've written a
spec, it's worth comparing the concept to the spec to ensure the
concepts meets what I want to do entirely.
| must use only components already purchased where possible | check |
| simple design & build (to ensure it actually gets built) | as long as I don't get carried away, check |
| require only the tools I have readily available | ditto |
| Fun to drive | an axe/lifter sounds fun. needs decent drive |
| At least 3 channel or has some form of articulation/manipulation | check |
| reliable (last at least an event with minimal maintenance/repairs | nothing fundamentally weak in an axe/lifter design. just need to be careful |
| invertible/self righting | check. might need some added ears/hoops to make sure though |
| doesn't have to be competitive | If it's tough, it might be competitive |
Parts,
Since one of the
requirement's is to use available parts where possible, it's worth
listing them before starting the design
Batteries
8.4V 3Ah NiCd botpack
2 x 12V 3Ah NiCd botpack
15.6V 3Ah NiCd botpack
about 10 x 9.6V NiCd(?) drill packs (unkown capacity)
2 x 12V 2Ah SLA
6 x 12V 12Ah SLA
Motors
about 8 x 9.6V drills + gearboxes (4 with all steel gears)
18V drill with broken ggearbox casing
7.2V makita drill/driver
2 x windscreen wiper motors
Electronics
6 x electronize, 30amp, external relays
2 x JETI 30amp forward only
FF6 40Mhz Tx
8 channel 40MHz Rx
2 x IMX mixer
PG-03 gyro
materials
almsot unlimited 1mm, 3mm & 10mm polycarbonate (scrap from work)
~500mm x 500mmx6mm aluminium unknown grade
~500mm x 500mmx3mm aluminium unknown grade
wheels
4 x 100mm scooter wheels
Pnuematics
random bits, mostly small bore, nothing complete
And....
An Old Robot
This was made for my A
levels and is a massively overweight featherweight. aluminium base and
bulkheads, polycarbonate armour with stainless steel angle around the
edges. 4 bar lifter (unpowered). 280mm pnuematic wheels powered by
windscreen wiper motors.Very low ground clearance. About
1000mm x 850mm x 300mm., weighing ~20kg with no electronics.
