Last edited by dyrodium on Sat Aug 05, 2006 12:27 pm; edited 1 time in total
Fri Sep 17, 2004 5:06 pm
andrew
Joined: 16 Jun 2004
Posts: 3110
Location: Castle Hill, Sydney. N.S.W
Well since u r reasonable new to this i would suggest building all electric powered robots. DOnt use gases or liquid mechanisms until u have more experience.
U can use electric window winder mechanisms for electric lifters.
Anywho. Jeff Johnson (giantrobo) has built one of teh best featherweights flippers round using nothing more than coke bottles (sith some fibreglass for strengh on them). the handle assemble from a air brush can and some modified bike pumps.
Phil has also used proper numatics with his robot marauder which is surprisingly powerful.
I would start with a more simple mechanism as i have had much experience in building things and mistakes and i still dont want to make one purely on the inexperience fastor. _________________ Andrew Welch, Team Unconventional Robotics
Fri Sep 17, 2004 5:23 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
theres infinite amounts of places to get pneumatic stuff from around here,
ive seen a few people with 1000psi liquid co2 tanks around and proper pnuematic cylinders. just have to know where to look.
SMC did our bmx gates a while back and theyve taken a shyteload of abuse.
for the humble begineer a pair of coke bottles and two bike pumps will give you something to roll the other guy over, but dont go expecting to launch them from one side to ther other on your first try. and stick to low pressure <90psi if you HAVE to go gas. _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Fri Sep 17, 2004 6:56 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
Angus, IMO pneumatics are great. You can attack your opponent and make it spectacular without destroying them. I like the idea of being able to battle all day. Spinners are spectacular also, but the fun is short lived. Self-right ability is another advantage with flippers.
The disadvantage to flippers is that you have limited gas and you chew up some of your weight allowance. That said, Marauder is 9 kg.
Flippers are very easy to do. A bar with a ram in the middle and a hinge at one end, throw in a tank and a valve and you have a complete weapon.
Marauder has a 32 mm diameter 85 mm stroke ram mounted vertically. The ram is at right angles to the fulcrum (hinge). The tank is an old fire extinguisher (free) that I pump up with 180 psi. The 3/2 valve ($20) and ram ($20) came from a truck wrecker. I run tube from a compressor airline between the items.
Please ask any questions you might have. Would you like anything said above clarified or expanded? Specific questions are the easiest to answer. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Fri Sep 17, 2004 7:55 pm
Spockie-Tech Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
An interesting point to consider is that there is actually a lot more energy per weight in a set of quality nicads than you can get into a gas cylinder.
However, since they are slow-discharge, batteries require some form of intermediate "electrical buffer" (much like pneumatics benefit from a buffer tank) to store the energy as it comes from the batteries before hitting the other robot with it.
This is why the Whyachi's keep coming up with novel systems like battery wound springs, and flywheel powered flippers.
Spinners, Thwacks and Rammers are all different forms of kinetic-energy storage systems
The main advantgae of pneumatics is thats is easier to get the energy out of storage faster than you can with batteries. Its quite dangerous though (as is anything that can dump a lot of power out in a hurry), so if you're playing with anything over 100psi, make sure you have someone with experience to advise you. _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
Fri Sep 17, 2004 8:06 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
well lachlan and im sure a few others can inform you of the danger of having a bike pump ram blast into the side of their garage _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Fri Sep 17, 2004 8:11 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
You could always buy Marshal's bot, MITE-E-ER. It has a lot of gear for the price. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Fri Sep 17, 2004 8:28 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
I don't think I will be using pneumatics for my first bot, I'll stick with electronics for now. (but thanks for all the advice! I will definitly use it in the future, I've got a design for a wicked new sort of weapon ) _________________ ( •_•)
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
Keep dreaming and good luck. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sat Sep 18, 2004 7:21 pm
timmeh Experienced Roboteer
Joined: 20 Jul 2004
Posts: 2523
Location: Victoria
So 145psi is off the shelf stuff is it?
Eg"easy to get and not too expensive used in most small machiens like dockers"yes iv been eyeing off the rams in the machien at work lol" and things like that?
So 145psi all i kneed is a ram pipe fire extinguisher bottle soliniod valve and compressor that will cut of at 150psi?.
I just dont know if i would be able to make a good flipper with 145psi?
Is there an advantage to using two rams at 145psi?
This is for a light weight!
Another thing what are the dangers of getting grit dust or anything on the air tank or sysem? how do i avoid this? _________________ Tim Team Reaper.
Sun Jan 09, 2005 4:09 pm
Windhammer
Joined: 19 Jun 2004
Posts: 338
Location: Roleystone WA
quote:Originally posted by Philip Taylor:
You could always buy Marshal's bot, MITE-E-ER. It has a lot of gear for the price.
Has MITE-E-ER still got its IBC?
if not how much does it cost without?
also ummm brett do get the emails from the robowars store???
Sun Jan 09, 2005 5:38 pm
timmeh Experienced Roboteer
Joined: 20 Jul 2004
Posts: 2523
Location: Victoria
Would jasons setup flip a light weight bot if it had a ram half the length and maybe a buffer tank for a quicker flip?
What psi is jasons setup? _________________ Tim Team Reaper.
Last edited by timmeh on Mon Jan 10, 2005 1:02 pm; edited 1 time in total
Sun Jan 09, 2005 8:54 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
quote:Originally posted by Team Hell Bent!:
So 145psi is off the shelf stuff is it?
Yes. 16 bar or 232 psi is also a standard.
Mon Jan 10, 2005 4:52 am
timmeh Experienced Roboteer
Joined: 20 Jul 2004
Posts: 2523
Location: Victoria
Would this flip another 27kg?
And would it take 145psi or more?
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