Bullfrog Rebuild Report

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Swedemac
Posts: 1
Joined: Mon Aug 27, 2012 2:01 pm

Re: Bullfrog Rebuild Report

Post by Swedemac »

What are those plastic covers? HDPE?

maddox
Posts: 83
Joined: Fri Jan 05, 2007 7:59 am
Location: Belgium

Re: Bullfrog Rebuild Report

Post by maddox »

The 2 top plates are 10mm HDPE1000.
The larger front plate is 6mm.

maddox
Posts: 83
Joined: Fri Jan 05, 2007 7:59 am
Location: Belgium

Re: Bullfrog Rebuild Report

Post by maddox »

The weight with full bottles. 95 kg. Royaly mesured.

The first life tests yesterday evening.

The drivetrain was proven before, but did prove it again.
The Iskra AMG 1.2Kw 24V motors are rugged. The 20-1 gearratio to 250mm airtyres gives a very fast acceleration and the 33V from the 8400mAh 10S LiFePo4 pack makes that it goes fast enough to satisfy our needs. Also, the Sidewinder we use survives stall nicely. Because that was the only glitch in the drive. A M6 bolt got in between the first stage and was nicely reshaped.
Bullfrog makes nice wheelies.

On the other hand, we our RC switch controlling the weapon uses 2 small relais (standard types like on the Graupner/Futaba switch), and those can't handle the power the Burkert coils ask. A 24V DC coil asks only .5A or so.
But we had 24V AC coils on them, and that's another matter. We should stick those to the CO2 bottles . "No, there ain't no bottlewarmers in this machine".

In short, we fried 1 of the relais on the switch, and we don't have any spare coils atm (the van got involuntarely empties last week)

Next week will be dedicated to painting the hardox ,aquiring DC coils and reinforcing the armor over the electronics.

maddox
Posts: 83
Joined: Fri Jan 05, 2007 7:59 am
Location: Belgium

Re: Bullfrog Rebuild Report

Post by maddox »

The first event for Bullfrog went good. Not perfect, but shows a lot of promise.


http://www.youtube.com/watch?v=xCHZzxy_ ... 7jPQdN15lg

http://www.youtube.com/watch?v=vRcsa_ck ... eoNZ6Sod7A

maddox
Posts: 83
Joined: Fri Jan 05, 2007 7:59 am
Location: Belgium

Re: Bullfrog Rebuild Report

Post by maddox »

An event report here, because the Event isn't listed in the event page.

This time the event started a day early, saturday 6 october. Around 10 am , Kos arrived. Tough As Nails would make the trip with Leo's van, Kos and Jeroen were traveling with Gravity 5.2, taking the chunnel around 5 pm.
A tad early, Kos and me went to Mapeco, the future venue for the 15 december event. (if there are forum-members interested, leave the wallets at home, or set a budget, as the brands sold at that place include Makita, DeWalt and Festool.)

Marien and Leo joined us, and we started the first round of "Van loading for advanced roboteers". After this, Bullfrog got the last bits of electronics , a touch up on the 2 CO2 bottles, and a short test. And to the van with the Green Mean Machine.

Having time to spare, we started reparing and upgrading Ltn Lee, Mariens Raptor. It got quite a beating at MMM14, cracking the 10mm polycarbonate baseplate and a series of dents and rips in the steel 20*20*2 box section. The box section got some welding and grinding , the cracked PC plate replaced by HDPE, and for giggles, added some hardox here and there.

Still time to spare, rummaging trough the stockpile here, the idea's started to percolate. It ended up with a drive to a nearby DIY, buying a very very very cheap anglegrinder (and a spare).

A txt message from Jeroen set us to the heavier work, and some cutting later, more stuff was loaded in the van. It seems Bullfrog is contagious.

Saturday, keeping in mind that we would start traveling around 3 am, was closed of with a spicy stew and some gentle talk.

A very early morning drive, and around 9 am local time we were setting up shop at the Maidstone leisure center.

Team RCC had 3 fights. 3 with Bullfrog, and 1 with Hannibalito 3.

The first fight with Bullfrog did show a disadvantage of a very low robot. It can slide between the steel cables of the RR arena flipper-annoying infrastructure.
After this fight, refill the bottles, remove the LifePo4 batteries and charge those,mount everything, ready.

The second fight did show some other weak points, but it was a good fight, as can be seenhere.
As can be seen, liquid CO2 was being vented, but it wasn't a big concern at that moment. Not a big disaster in itself....
Refill bottles, charge batteries

3th fight. Razerdave at the wheel. Unfortunatly, the flipperarm started rising slowely when I opened the first bottle gently. Closing that bottle, and into the fight.
Was a good fight, pity about the weapon as some great flips were in the offering.

Hannibalito 3. Just entered it for 1 melee. Last week it came out of the arena at MMM14, gassed up and recharged batteries at that even. At home we did grind off some sharp edges, and at Maidstone we trew it in the arena, and it went for it. No complaints, no nags, no sags. Just plain flipping anything on the flipperarm.

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