Beetleweight motors / pneumatics(?)

[Byron]

Hi everyone, I've been planning to build a beetleweight flipper robot, and I am pretty new to robotics having only built an antweight before; do these motors seem good enough for the job if I attach ~50mm diameter wheels to them?

http://www.tme.eu/gb/details/pololu-...sories/pololu/

Also, would it be realistically possible to make the flipper pneumatic? If so, could anyone recommend any parts that would be sufficiently small and light to fit in a beetleweight? I know it may be quite ambitious but I'd like to give it a try.

Thanks

[Garfie489]

Im building a beetle weight pneumatic flipper atm, pain in the backside :P

Everythings so small its hard to find fittings for it ect. Alot of the things needed are either gold dust or just not a simple off the shelf job. A pneumatic parts company i usually work with couldnt source a dump valve anywhere near small enough for example.

It can be done, its just not the easiest first build. Motors look good, but ill leave that to people with more experience to comment on tbh.

[daveimi]

http://m.ebay.co.uk/itm/4mmx11mm-Sha...039?nav=SEARCH

This is what u want

12v 1000rpm 25mm dia with 4mm d type output shaft

[joey_picus]

These are more the standard these days I believe :3 the Pololu ones will do fine, but they're a little expensive for what is basically the eBay motors in a fancy box.

[Jimmy]

I was curious about putting pneumatics in a beetle, but a bit too tricky to try for me to consider attempting yet. The only beetle gas flipper example I've seen online is one called flange, which looks like it would be pretty effective:

https://www.youtube.com/watch?v=VG9A69Y0Uxo

although I have no idea how it was put together, maybe it is someone's on this forum?

[Byron]

Thanks guys for your help. It seems that the motors you suggested Joey are the best value, but they don't appear to have near as much torque as the Pololu ones, so I'm not sure which to get.

Looking at the pneumatics again, I found that there are quite a few small cylinders here (hopefully hyperlink worked); I would've thought that 10-15 bar would be plenty for flipping 1.5 kg. Flange looks great! I'll see if I can figure out how he did it, what parts he used.

[Byron]

Okay, I'm still keen on the pneumatics idea, and I've managed to find a video showing the pneumatic system inside Flange:

It looks like a custom made ram, a solenoid and a CO2 catridge with a few connecting pipes and nothing else (please correct me if I am wrong); does anyone know where I could buy a ram and a solenoid capable of handling full pressure from a CO2 cartridge at full pressure?

Also I shall get those cheaper 1000 rpm motors. I'll be using a Sabretooth 2x5 ESC which I have; I'm 90% sure it will cope fine with 2 of them and I assume 4 would be okay too? Just wanted to check with you guys before I bought anything as you all know better than I do :P

[daveimi]

You need to talk to Will (Team Shock) as he built a pneumatic beetle for the first event they did. The 2x5 struggles runs great with 2 motors but struggles with more.