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I was just wondering how much experience people have with crushers, like how many tones of force it takes to go though different materials, like I guess with a shaping tip, a tone of force would go though 5mm of hdpe quiet easily? But I not really know, any information will be help full
200kg goes through 5mm easily :)
Really, as little as that? Wow, I sopose you can hammer a nail into it pretty easy... But what about metals? I know that would take considably more, but what like? And I don't know how I would go about working it out? Any one got any ideas?
Built a featherweight crusher a few years ago. The acuator had 10000 n of force it had about 1000kg at the tip. aheres a few vids of it against different materials.
http://www.youtube.com/watch?v=kc6PmRQn_no
http://www.youtube.com/watch?v=pcxku4u_DQU
is that dragonclaw?
Yes.
The only problem was it broke its own back and to make it strong anoth to take the force could not get it under weight
That must be one big actuator :crazy:Quote:
Originally Posted by dragonmaster_1
Wow that's some descent crush, I was going to have about triple that at the tip, how well do u think that would fair against steel (assuming the crunching tip is string enough)
idk but you would likely blunt the tip of the crusher
What would you be using to get triple the force.
Dragonsclaw had a 6mm ali base and 10mm ali sides and it snapped the ali sides. heres a few pics
would a drill motor and threaded rod set up give you a force enough to go through hdpe? or would it need to be hydrolic or pneumatic...etc
I was thinking of using a full pressure pneumatic ram.... As I can't fauns a descent actuator, or a light enough hydrolic system.... So I was going to use a hefty ram....But idk how I'd make it sting enough for that, a big lump of hardox me thinks....
That got through 2mm Ti worryingly easily.....
wouldn't weight be an issue then???Quote:
Originally Posted by Bodge Job
i've made a few crushers, and i've got a half finished one i started a while ago. i found the main problem was like tony found the forces used ending up breaking the robot its self!
my vertical crusher uses a 200kg actuator and that goes through 5mm poly and hdpe like its nothing even 8mm and it happily eats through computer towers etc etc
be nice to get it to a full combat event where i could have some one on ones cause mine could really damage the likes of explosion and some of the other really good robots with only thin hdpe armour- just a case of finding the time to finish things
how effective a crusher Is depends on a few things
the force the linear actuator or other exerts
the ratio between pivot points (this changes the tip force)
Shape and position of tip
-for example a tip with right angled edges will work better
-how far tip is from linac
my fw crusher was originally a linak minipak that was overvolted to 24v and in the end produced 10000n (1000kg) , however because the crusher tip isn't on the end of the linac there will only be 700kg at the claw tip (hence above)
So that's what I learnt when designing mine
I have since changed to a dewalt drill motor as the linacs motor so the motion is much quicker .
hope this helps
Alex
Ok thanks, I was going to put the ram about third of the way up the arm a nice traditionally cerved so the tips pretty verticle, steel mounts, either mild or hardox, and a hard steel tip, hopefully something harder than hardox, so it doesn't blunten when it's used against that, but I don't know what is that hard that won't instantly brake off, so any suggestions for that would be nice, like what are the blades on spinning blades made from? And thanks for every ones help so far!
also the most force is exerted when the tip is at a right angle to the 'ram'
alex
Yeh ok thanks, and I was wondering, as ive been searching around the form for a while and I can't find what it is, so how many litres of CO2 is in a 20 ounce CO2 paintball bottle (or the fire extinguisher equivalent)?
No offence, but did you try the Search function?
I just searched '20oz co2' and found the answer within five posts.
search.php?keywords=20oz+co2&terms=all&author=&sc= 1&sf=all&sk=t&sd=d&sr=posts&st=0&ch=300&t=0&submit =Search
(5th post down, posted by Mario (maddox10))
I tryed to use the search function, I tryed tank and volume, but nothing came up, and the one you found was at 16 bar, how ever I did find one for full pressure later on, and it said it was only a litre of co2 at full pressure in a 20oz tank, so either what I have found is wrong, or I really need to re think my ram size. And thanks for your help, it was quiet late when I searched it, so I probably didn't do it very well.
The pressure is regulated to 16 bar from the bottle to the ram. When it's in the bottle it's still full pressure CO2, so would still be 307 litres (if my limited pneumatics experience is correct). If the ram in that example was smaller or was operating at less pressure, it would get more flips as it would use less gas per actuation, but since that's only after it's been regulated to 16bar, it doesn't alter the volume of gas initially in the bottle.Quote:
Originally Posted by Bodge Job
middle of page http://www.teamonslaught.fsnet.co.uk/co2_info.htm
http://encyclopedia.airliquide.com/ency ... 81&RD29=82
wow....to many charts for me.....