Halo will be another dull box, because I don't want to do the trigonometry to make angled sides. Sticking out of the top of Halo will be a vertical rod with cables and weights. The rod will be spun, and the weights will flail around. There's more to it than that, but I'm saving the details for later entries.
I'll be building my own speed controller again, I have some ideas on how to improve the my Rott-bot design.
For money, I'm budgeting $2500 for this competition. As usual, the stuff that is at risk of destruction in the ring is only a small part of this: a lot of money is in tools, and some is in spare parts. And some of that money will be for travel expenses.
I've broken the weight budget into two parts, the drive platform and the weapon. I'm aiming for 85 lbs for the drive platform, and 20 lbs for the weapon, which gives me a little bit of wiggle room with the 115 lb Middleweight limit. I find that this is a good way to start, since keeping things within the weight limits is one of the bigger challenges.
|Item||Description/Quantity||Weight||Total Weight||Cost||Total Cost|
|Drive Platform Frame||approx 40 ft of 3/4-inch 0.063-wall square steel tubing||0.7 lbs per linear foot||30 lbs||$6.40 per 10-foot length||$26|
|Batteries||Two 12V 7Ah sealed lead-acid||6 lbs each||12 lbs||$20 each||$40|
|Drive motors||Four 12V DeWalt cordless drill motors, with gearboxes||2 lbs each||8 lbs||$80 each||$320|
|Wheels||Four 10-inch pneumatic tires||4 lbs each||16 lbs||$10 each||$40|
|Armor||3/16" polycarbonate, about 18 ft2||1.2 lbs/ft2||22 lbs||$5/ft2||$90|
|Drive Platform Sub-total||88 lbs||$520|
|Weapon Frame||7 feet of 3/4-inch steel tubing||0.7 lbs per linear foot||5 lbs||$6.40 per 10-foot length||$7|
|Drive motor||Another drill motor||2 lbs||2 lbs||$80||$80|
|Flail ends||Five hammers||1 lb each||5 lbs||$5 each||$25|
|Weapon adjuster||Linear actuator||8 lbs||8 lbs||$80||$80|
|Weapon Sub-total||20 lbs||$190|
|Grand Total||108 lbs||$710|
Next: Parts and Frame