Team Shakey Build Diary- Featherweight

[maddox10]

Also that is a lot more flips than I was expecting to get out of the bottle so I'll see about moving to a 12oz one that is lying around the house somewhere.

FP using Hannibalito III gets enough shots from a 12oz bottle. So, why not?

One small question, what ground clearance between the arena and the base of your chassis would be good? This is for running at the roaming robots type events so the arena gets quite damaged towards the end.

Each to his own in this case, but I prefer more grundclearance. Getting flipped is less annoying than get stuck on a toothpick and left for death by the opponents.

What issues are there with valves and failsafing? I take it you just need a failsafe to keep the last known command on the channel the valve is on so it willnot fire when signal is lost?

A failsafe just should do what it says, making a fail situation safe. The ram in or out, who cares , as long it can't move in the failsaved situation.

[swanaldo]

10 bar isnt a bad option to start with. I think you will be surprised on how well that mech will work on 10 bar. Easy and cheap parts to get hold of and it will get you going. Get a good flow rate on a 10bar system and i think you will be more than happy with it. We were going to do the 16bar option with chuck but we are happy with how it performs and wont be going to 16bar.

Good luck with the build tho.

[Shakey]

One of the reasons for the large cylinder was that I couldn't find a replacement valve for a paintball one unless I am missing some obvious solution?

For now I'll run it at 10 bar but build all the fittings to 16 bar so I can switchover when I can afford a high rated valve. The only components left to get are a dump vlave, PRV, piping and push fittings (which I think Norgren do 16bar varients of).

Thanks for all the help.

Also I like chuck it is a very nice robot!

[maddox10]

You'll see an influx of unadapted paintball bottle users at the UK events.

The reason why the screw valves are so common, was the difficulty to find an on/off valve for the paintball bottles- standard equipped with a pin valve-. But that's no longer a reason.

Another reason is the refilling at events. Most event organisers have a big bottle refill hose. But no paintball refilling station.

That is easy to solve. If you want to test at home with CO2, you'll want a big source bottle and a filling station. Meaning , you just will have to undo the big bottle filling station, fit your own standard paintball filling station and fill your bottle.

[Shakey]

I have started the main CAD of the robot so I can sort out the sizing of everything. There should be enough room inside for the rest of the pneumatics and electronics to sit once I get sizes.

This is built for 100mm blue wheels and they will have some guards on but I haven't done them yet.

The majority of this is 8mm HDPE. The Angle Iron down the centre for the flipper should lend it ridgidity.

[Ellis]

How do you plan to join 8mm on edge to the base-plate?

[Shakey]

It will probably be a mix of brackets and screws to help support it. My main Concern is if it will flex too much If I am hit on the side so I might add some triangle supports at 90 degrees to the wall. I have worked out that the entire chassis will be made out of 10 bits of HDPE with 5 forming the CAD and the other 5 for the front and top.

I don't look forwards to finding out how it does against axes. I don't intend on putting this against spinners though.

[Laser]

how are you mounting your ram?

[Shakey]

how are you mounting your ram?

The ram (When I get aournd to CADing it) will be mounted at the back with a pivot sitting underneath the CO2 tank so it can pivot on a vertical plane. It will be connected by a bar on the front two bars from a mount, which is basically a nut that screws onto the end of the ram welded to another pivot. My only worry is if the bar on the front will withstand the force of the ram or whether it would bend.

Then I have to be careful piping into the ram otherwise it might be caught in the ram which I can't imagine ending well. :P

Also the angle Iron is on order So I can begin building the flipper frame soon so there is something to look at other than CAD.

[Shakey]

I got the main shape done and I quite like the look of it. I think it is fairly interesting even if it isn't the most effective. I will be putting some kind of guard around the front wheels at some point.

I'm waiting on some wheels befor eI cad them in so i know the exact details of the dimensions.