First featherweight robot questions

Hi everyone. I am planning to build a featherweight pneumatic flipper robot and I got some question.
I plan it go in 1 Mpa(145 psi) in the 80mm bore 80mm stroke ram, do you think it work?
I can't find any ram can operate upper 1 Mpa, I think a self made ram is too dangerous for a people who first time build this kind of robot.
What regulator you usually use? I can't find a regulator can input 30 Mpa and output 1 Mpa
I do not know why using a motor from a drill, I can buy a motor with gearbox having the same performance. Is the gearbox in the drill more durable?
I think a flipper robot may be too complicated as a first robot, what kind of robot do you suggest as a first robot?
I would like to attend the RoboChallenge 2016 if the robot can complete.

Welcome to the club!

I'll leave the pneumatic questions to others with experience in the topics.

To answer your other question, we use drills because they are easy to get a hold of, cheap and give an ideal speed output. They are tried and tested and we know they work. If you have another idea then by all means post a link and we can advise.

A flipper can be complex or simple. A lot of people start with a rammer as you get a good feel for the rules and experience your first event with a fairly simple machine. That's not to say that a more complex machine isn't possible. Just depends on your experience.

Thank you. I will try the motors I can get, I have ordered some. I may build a rammer or something if I can't solve the pneumatic problem untill march first. I have got a piece of 20mm HDPE for structure as many people do.

http://ranglebox.com/

If you want some high power, pre built stuff then you can order from here. They do Motors which are bigger than Drills with a prebuilt gearbox and also ESCs which again should be more than what youll ever need in a feather.

Just an alternative should you decide you want to buy something which can then be reused into a more combat focused machine afterwards - many championship robots do still run on drills however, so its not urgent to buy anything above whats considered starter (just worth being aware of)

Thank you all, I will not come to attend the RoboChallenge 2016 because of some funding problem, I may attend it next year. So that I have whole year learning and building my robot. Please everyone exhibitions in now and future.

Pneumatics in feathers.

Using standard low pressure pneumatics is possible, but it's a heavy and large way to build. Can you give us the size and weight of your ram?

Most succesfull pneumatic featherweights use a CO2 paintball bottle for gas storage. This because they are easy to aquire and are perfect in the rules.
But there are machines that use a 12 or 24V "car tyre inflator" compressor.
Regulating CO2 from the paintball bottle.
2 main options if you're not an experienced engineer/pneumatics user.
Paintball regulator or Trevor regulator.
Trevors are custom regulators for RW, quite a few in use, but not easy to aquire.

Adapting a small industrial regulator is possible, but again, heavy and large.

Thank you replying. I have viewed some paintball regulator and I think the AG1 paintball regulator from Rap4 is good.
The ram I plan to use is 63mm bore and 50mm stroke. (I don't know why it is 63mm), operating at 1 Mpa.
I also wonder that the flipper force should be just upper opponent weight or much higher? The force according to my calculation the ram ouput is 3117N and the flipper as a lever it is 623N at the tip.
CO2 I know it can only up to 7Mpa but High Pressure Air can up to 30Mpa, why people choose CO2 but not HPA?
By the way, I found there's light build in the receiver and ESC, when I close the switch they will light up. Do I need a extra light to indicate the robot has powered up?

People choose CO2 because there is a pressure limit for fighting robots in pneumatics. CO2 is just about liquid at this limit so you get he same force but a much greater volume of gas meaning more actuations.

HPA under the rules doesn't really offer any proper advantages but with the disadvantage of far less flips.

The rules give us a maximum gas pressure of 1000psi/70bar/7 MPa.

For a storagebottle of the same size CO2 stores about 300%+ more gas. This because CO2 becomes liquid and densifies 10fold @ 5.5MPA at 20°C.

The disadvantage is that CO2 needs a lot of energy to go from liquid to gas.