Team MedBots

[Max]

Yes that is pretty much all the arduino is doing. I imagine it could be done with a smaller cheaper chip but it seems easier just doing it with an arduino- I understand it and can program the chip on my arduino and the actual chip only costs £2

[Merkabah_PT]

I saw a guy in some website using a regular servo pcb, with 2 schmitt triggers to control 4 heavyduty MOSFETS. I will try to find a link and post it.

[Merkabah_PT]

I found the links.

First one is a guy using the servo pcb outputs directly to the mosfets with some problems, then a guy in the coments explain him that he should use schmitt triggers.
http://letsmakerobots.com/node/20466

The second one is from the guy in the coments explaining and testing is solution. He drives a 5A motor, but it's just a matter of using bigger MOSFETS.
http://letsmakerobots.com/node/34692

It's a very simple and small DIY ESC, and you can even and an internal UBEC.

Hope this helps. I will for sure try it out when i build a more serious robot.

[Max]

If I use a 2kg co2 bottle as a main tank and a 60mm bore, 300mm stroke ram am I right in thinking I will get about 20 actions?

[Max]

Also, could I use a QEV like this:
http://sigma-valves.com/pdfs/Quick-Exha ... v-0110.pdf
Or like this:
http://www.parker.com/portal/site/PARKE ... tky=VALVES
To control a high pressure ram along with a high pressure 5/2 valve (hydraulic?)
Thanks,
Max

[maddox10]

If I use a 2kg co2 bottle as a main tank and a 60mm bore, 300mm stroke ram am I right in thinking I will get about 20 actions?

Depends on used pressure.

If it's 8 bar, you can get 100+ single actions out of it.

If you go FP without any liquid stopper you will be glad that it's 20 actions.

Also, 60mm bore is a strange size. Commercialy 63mm bore is more common.

[PJ-27]

Sorry for the slight hi-jack, but when using a QEV as your main firing valve how do you control it remotely?
I thought they all had manual pulls? Or do people just modify them so that a servo/solenoid does the pulling?

Also can you get QEVs that allow flow to go straight through? Looking at that design it has to go through a bend, which on an exhaust valve that's meant to be quick, seems a slight flaw?

[maddox10]

Follow the Woody guidelineon QEV's as main valves. He's one of my teachers, aswel Mike L...

[PJ-27]

Thanks.

[Max]

How much space should I allow between two mod 1.5 gears?
Ie. if I want to mesh a 15T with a 30T gear what distance would I put between the holes for the centres?
On a different note, could a relay rated at for instance 30A switching current actually take 150A once it's closed or can it only ever take 30A?
Thanks.