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Hi, I recently joined the popular sport that is Robotic Combat, and I have decided to make a featherweight for next years FW UK champs. I have a rough idea of how it will look, but I'm a little stuck on a few technical details.
1) For 12v motors bought of the RoboChallenge site (http://www.robochallenge.co.uk/Events_a ... nical.html), what kind of speed controller would I need?
2) How would I make a pneumatic flipper?
3) What is a good pressure level for a featherweight flipper? Maybe 10 bar?
Welcome Jarvis. I'd recommend reading through all the many many previous posts on the same topic within the featherweight forum. This one would be a decent start,
viewtopic.php?f=111&t=3414
One that failsafes. Common recommendations are the Electronize, Sabretooth or Scorpion XXL. If it's really powerful, a (heavyweight designed) sidewinder.Quote:
Originally Posted by MicroGravity100
Bottle, regulator, safety valve, dump valve, solenoid valve, cylinder.Quote:
2) How would I make a pneumatic flipper?
Higher the better but the lower pressures have non custom & highly available components. Check the for sale board.Quote:
3) What is a good pressure level for a featherweight flipper? Maybe 10 bar?
Dude those are big questions that take a lot of research and knowledge to answer have s search through the topics first and narrOw the questions down.
Quote:
Originally Posted by MicroGravity100
1. fine
2. try having a read through other threads, here is a good website about it aswell: http://www.teamdavinci.com/understanding_pneumatics.htm
3. start out with low pressure (10 bar) parts can be bought off the shelf and it is safer
i have trevor regulator,battleswitch and 50mm bore 100mm stroke ram for sale at the minuite
Got any pics of the ram Jonny :?:
i'll put up a picture, battleswitch and regulator gone now though
i've put up a picture on my for sale thread :)
For a high pressure ram, would this be good? Its about 3000 PSI, and looks perfect.
http://www.hydraulicsonline.co.uk/hy...mm-rod-52.html
And could this be a good 3000 PSI gas cylinder?
http://www.jtote.com/product_info.ph...3?currency=GBP
Ram will be far too heavy, but would work. That bottle isn't for CO2.
What about this bottle? http://www.store.justpaintball.co.uk...pin-valve.html
And for a ram, I was wondering where I could get one from that's high pressure; could someone send me a link for one, I'll keep looking too.
you would probably have to get one custom made to cope with the pressure. hydraulic rams are fine though but they are very heavy
Found a Hydraulic cylinder with spring return, weighs 1.5kg on right stroke size:
http://www.powerteamhydraulics.co.uk.../single-acting
Found an HP Gas Bottle too:
http://www.ebay.co.uk/itm/UP-CO2-Aqu...item255987a905
I had a look at the ram.
If I'm correct, it's the 82.5mm stroke 5 ton variant. Bore is 28mm, means 320 kg of force with CO2.
Total length 165mm, and 1.5 kg.
To compare. Hannibalito III uses a 51*85 ram, 1 ton of force. Total length is 145mm, and that's including the 1/2 inlet and the thick top plate that acts as part of the frame.(that hydraulic ram uses a 3/8 npt) Weight, less than 1 kg
The aquarium CO2 bottle looks like a standard paintball bottle. So, a good deal with that pricetag.
I suppose its a bit of a trade off on weight/ability compared to cost. Can't see a cost on that page though so would need to ask them before comparing it to the price of a custom one, then if its all suitable I suppose its your choice from there.
It costs £214.02 if you add the £7.50 P&P & the VAT. How much would a custom one cost?
Depends on size, but less is a fair remark.Quote:
Originally Posted by MicroGravity100
Not that many people willing/capable to supply custom FP rams tough.
Where could I get one from?
http://www.ebay.co.uk/itm/Norgen-PRA...item3cbaeef71e
I stumbled across this lot yesterday and they seem to be fairly decent with a nice 16 bar pressure maximum. Bore and stroke isn't too shabby either. They are a tad on the heavy side by the looks of them though.
Thanks, but their pressure limit, 16 bar, is low. I need a higher pressure ram.
Does anyone know where I could get an HP pressure relief valve?
Mario can do both
Ok, one thing is still bugging me; how do I failsafe everything?
The pneumatics? You get an radio controlled switch & wire it up the valve solenoid as shown in the supplied diagram.Quote:
Originally Posted by MicroGravity100
Pretty much anything that has a servo lead has an built in fail safe, with some very aircraft based exceptions.
Thanks, but not just the pneumatics; everything. Is their a controller with failsafes?
Most speed controllers fail safe.Quote:
Originally Posted by MicroGravity100
Electronize, Scorpion XL & Sabretooth are the most common found in FWs.There are other boat controllers out there that do also but are designed for,well, the current of boats. I'd recommend Electronize to anyone, not the best but simple, doesn't break easily & cheap.
For the pneumatics, try technobots own RC switch or the Battle switch. Both will fail safe the system.
Ok, finally, I just have to ask this:
Is this all I need, and will they all work together?
Motors, Wheels & Mounts:
http://www.robochallenge.co.uk/Event...echanical.html
Removable Link:
http://www.robochallenge.co.uk/Event...lectrical.html
Battery:
http://www.technobotsonline.com/haze...12v-3.3ah.html
Ram/Pressure Relief Device:
http://www.fightingrobots.co.uk/foru...p?f=166&t=4280
Cylinder:
http://www.ebay.co.uk/itm/UP-CO2-Aqu...item255987a905
Dump Valve:
http://www.ebay.co.uk/itm/Mini-Lever...&_qi=RTM637057
Pipework:
http://www.technobotsonline.com/nylo...l-m-32615.html
Speed Controller (FF30HX):
http://www.electronize.co.uk/online_ordering.htm
HDPE:
http://www.directplasticsonline.co.u...eet/Black/8mm/
LED€™s:
http://www.technobotsonline.com/deli...ight-leds.html
you'll need a solenoid valve to control the cylinder and an on/off valve.
also the tank is really expensive inc postage the bottle in front of me is the same size but half the price
http://www.amazon.co.uk/approved-20oz-C ... 384&sr=8-1
plus you will need a battleswitch to the valve