Andron4000 HW crusher build

[jonophilpott]

That is my old heavyweight we build 10 years ago bear in mind haha. Was just seeing if he was interested or going to scrappy.

[Andron4000]

Hello,

Thank you jonophilpott. PM sent

We have had a few companies reply to emails and Flowfit do an all in one unit (pump, motor and reservoir) which seems to fit our requirements. we may also be able to remove the standard motor and replace it with the Ampflow 48v fan cooled for some extra pressure and weight saving.

In terms of the batteries, We estimate that the drive system is about 2kw, and the weapon motors may be 7kw
we are planning to run two of these in series
http://www.hobbyking.co.uk/hobbyking...Lipo_Pack.html

This will give us 44.4v to run the weapon system.
The drive system will run at 36v max, so we will have to step down somehow to go to the ampflow dual speed controllers which come with a 5v output for the rc unit.
Will we have to run 2 separate circuits for the 48v and for the 36v systems? (2 battery set ups) and if so, can the removable link essentially be 2 links stick together so that when a single piece is removed it will break both circuits?

[maddox10]

Those batteries are only 10C rated. Even if they are huge with 16000mAh, it means they can only dish out 160A.

Also, stepping down from 44.4V to 36V, with the amps a decent drive use. Not easy.
You can't dump a resistor in series with it. (actualy, you can, but it will be a big one)


But if you are doing it like that, you only need 1 link.

[Eventorizon]

Will we have to run 2 separate circuits for the 48v and for the 36v systems? (2 battery set ups) and if so, can the removable link essentially be 2 links stick together so that when a single piece is removed it will break both circuits?

Having multiple links isn't a problem, they just need to be next to each other. They don't even need to be connected (so if you pull 1 they both come out) but you may as well cable tie them together just for convenience.

[Andron4000]

Sorry, my mistake,
2 in series and 2 parallel we calculated
So would you recommend keeping the two systems separate?
Since the weapon system is quite complicated, we are already thinking about splitting it for 2 person control. Should we get 2 receivers and run completely isolated systems?

[Eventorizon]

Its up to you but many robots have dual power setups. Both of our Featherweights have separate looms for the drive and weapon. For example, mine has a single 5S drive and dual 6S in series, giving 12S for the weapon. The only point they meet is at the receiver but that is only so the weapon ESC gets its signal, the RX gets power from a BEC in one of my drive ESC's.

If you are happy with 2 drivers then 2 isolated systems would be fine too, nothing against it. Many teams do this so that they can one member focusing on drive and the other focusing on the weapon. Most of the house robots probably have 2 so that they can respond faster and be more effective; imagine 1 person trying to control all of Sir K's functions! It also helps with trouble shooting and can stop electrical issues damaging other components, just make sure you label everything neatly

[Andron4000]

Hello Guys,

Does anybody know why the RobotMarketPlace is showing the NPC-T64's as discontinued? We have tried to conact them and had no reply.
We contacted NPC directly to place an order after seeing this, but were told for international orders to use the robot market place.
Since this is our only supplier for these and they are showing discontinued, we have decided to go for the T74's in case we need more in the future.

We have managed to find an all in one 24v hydraulic unit from Flowfit. They have been very helpful and have work with us and helped us figure out exactly what we need in terms of valves, gauges etc.
Mini 130 Hydraulic Power Unit

• 24Vdc 2.2kW motor c/w start solenoid
• 2.7cc/rev pump
• Pressure line check valve
• Pressure line relief valve set to 200 bar
• Cetop 2 interface fitted with 4 way 2 pos P to A & B to T then crossover directional valve 24Vdc
• 2 litre plastic reservoir
• 5 L/min @ 200bar

We are using it to run a 75mm, 200stroke cylinder which should give 8 tonnes. All of the components are rated to 240bar (apart from the pressure relief) so there may be scope to over-volt the motor and get more from the pump.

This is our electric circuit so far

CIRCUIT SCHEMATIC.JPG

In terms of the shot bolt, we did think about using a small hydraulic cylinder, but did not want to complicate the hydraulic system, so are now looking at an electric actuator.


http://www.ebay.co.uk/itm/DC24V-20mm...-/262478235663
ebay, elect actuator.jpg
This will not have to take any forces directly, as we can use it to drive a shot bolt.

[Andron4000]

False alarm!
We have had a reply from the robot market place, and the NPC T-64s are shown as discontinued as a result of a 'website error'.
They have assured us that there are plenty on hand, and no plans to discontinue.

[NKT]

If you're custom making the arms, I'd suggest having some sort of clamp to tighten the arm, rather than the shot bolt. For one, it will clamp at any point, and for two it is easily freed up after use, and for three, you won't end up struggling to reset it during the fight for a second go.

In fact, am I missing something of is it a single shot weapon?

[maddox10]

Even with 2 of those batteries in parallel, the max amp is "only" 320A.

I know that the ampflow will draw that and more if stalled.

And running 2 seperate RC setups. Why? Most of us that tried simular setups just use a buddybox.