Pneumatic

[wazio]

Pneumatic

thanks for the nice comments guys! Tho my shop is usually a massive mess! I did a little more work on it today on my day off. I have to go to class for the evening, but I will probably work on it more when I get home. I will mill the other belt slot, lathe a new piston, and lathe a support for the arm mounts. Then all I really have left is to make the arms and armor. In that order. Weight is looking good.. A few new pics.
http://pg.photos.yahoo.com/ph/wazio88/album?.dir=7a41http://pg.photos.yahoo.com/ph/wazio88/album?.dir=7a41

[wazio]

Pneumatic

And more work still today! Did a little CAD (cardboard aided design) and got the shape or my armor set out. When it is all said and done I will have about 10 pounds left for the arm and armor. Version 2 of the bot will be alot better on weight, but I think 10lb is enough to have 1/4 AL armor with Ti bolted to the bottom few inches. look on the yahoo page for pictures.

[woody]

Pneumatic

Do you forsee any problems with .......what appears to be .......an offset cylinder and flipper pivot arrangement?

[wazio]

Pneumatic

nope... But it could happen. We shall see.

[ewan]

Pneumatic

Would create a twisting force and therefore more friction methinks, but then again I havent seen what linkage layout your gonna be using.

[Kenny]

Pneumatic

looks like it wasnt designed to have the ball valve in between ram and valve that would bring it to centre if not

[wazio]

Pneumatic

That is true. I did not want to have that thing in the system. But the safty person at the event that I am going to said that I had to have it :-\

[wazio]

Pneumatic

The arm is going to be rather beefy to make up for the twist that will be going on. The next frame will have a different tank layout so the shape will be alot different.

[wazio]

Pneumatic

Nope. I did not want to have that ball valve, but the safty boss at the event that I am going to go to says that I need to have it. Inorder to try to keep the whole thing from twisting I am going to make the upper arm really beefy. . . Might work well, might suck. I have no idea! We shall find out soon enough.

[leorcc]

Pneumatic

Can you or that safety official from the event explain to me what possible use that ball valve has?


(Message edited by leo-rcc on February 01, 2006)

[killercarrot]

Pneumatic

Does it replace the locking pin wed be forced to use?
Instead of us having a bracket or pin to prevent the arm from moving, maybe they have a valve to prevent the gas from getting into the cylinder in the first place...
I guess it could be slightly safer, with the dump valve open, and that ball valve closed.. if theres a misfire there wont be the strain on the locking pins?

[woody]

Pneumatic

The bot is being entered in Motorama ......Al Kindle is the safety official.


I personally cant see the need for the valve ...... but .......Al of course has the right to impose any safety features that he decrees necessary.

http://www.nerc.us/http://www.nerc.us/
http://www.nerc.us/rules.htmlhttp://www.nerc.us/rules.html

(Message edited by woody on February 01, 2006)

[maddox]

Pneumatic

Rob, it is inherently unsafe.
A Burkert needs a pressude differential of 1 bar to close down perfectly In a normal system the size of the hoses and resistance in the system gives this valve the chance to do its job, withoud endangering anyone.
Combine it with a screw valve on the bottle opening slow and the Dantomkia/ Bigger Brother style extended ram locking pin nothing can happen, even if the burkert failed.

Put in a ball valve in between the main valve and the ram reduces the size of the system downstream, acting like a initial buffer, as it would fill with CO2 at full pressure. Opening that ball valve would send in a rush of CO2 bigger than the trickle normaly could happen.

According to me, the safetyguy there is just grasping at straws to avoid the dangerously explosive high pressure pneumatics

[Guest]

Pneumatic

Looking at the layout the ball valve will be under the flipper arm. So that means you have to stick you arms into a loaded robot to make it safe. It would be much safer to have a locking pin which you can sneak up behind the robot to insert. I think the saftey official has made the robot more dangous to turn off then if the valve wasnt there.
Actually if your arms are in the robot under the flipper arm trying to turn it off, where is your head? Oh, I dont like that at all.

[wazio]

Pneumatic

I am with you guys. . . I dont like it at all. It just adds about 8oz that I could use for something else. But, I have to have it. So I got over it and in the bot it is. I hope to have the armor done this weekend and maybe part of the arm. . . Pics as I get stuff done.