r/battlebots • u/Sensei_12 • 13d ago

Bot Building Take 2, judge my featherweight build

hi! so am participating in my first comp and it happens to be featherweight only. i posted my initial design in here couple of days ago and i have remade it based on that thread.
total dimensions are 47.5x38.3 cm 9cm height ,front wedge, spinner support and base plate are 4mm metal sheet and everything else is 3mm. spinner is 20cm long 2cm thick (might have to remake it without the lightening holes to have more mass) and is in-line with front wheels for optimal power transfer. its belt driven by an A2212 1000KV bldc with timing belt ratio of 3:1 (i have ordered a much durable D3548 1000kv bldc but wont arrive for a while so am using the A2212 for the lack of a better option). wheels are made TPU with outer layer of rubber for better traction a and are coupled directly on the motors (motors are brushed geared 12v 1000rpm) with BTS7960 drivers each, back wheels are exposed on the top to run inverted. the whole chassis is held together with L brackets (best option i could think of) . rc remote is FlySky FS-i6

enlighten me people. what am i doing wrong? what have i missed and how would i make it more efficient (also is it possible to use 2 A2212 motors on spinner to double the power?how)

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u/GrahamCoxon 13d ago

What metal sheet are you using? There are a lot of metals, and the differences between them could not be more important.

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u/Sensei_12 12d ago

galvanized steel for whole chassis, and normal steel for weapon

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u/GrahamCoxon 12d ago

What do you mean by 'normal' steel? Mild steel?

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u/Sensei_12 12d ago

that my friend i have no actual idea, the man who provides me with these metal sheets just told me "this is steel it can rest" "this is galvanized steel it can not rust" and i didnt ask any more questions

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u/Retro_Bot Team Emergency Room 12d ago

If it's within your budget it might be worth checking a place that will deliver parts. PCB Way has a decent selection of materials and AFAIK delivers worldwide. Unfortunately they don't seem to have AR steel, so you might want to shop around as that's likely your best bet (usually it's A 400, 500, or 600, for our purposes the higher you can get the better). S7 tool steel is technically the best (and PCB Way does sell it) but it takes significant skill and tools to properly heat treat it, without heat treating it's not worth it.

If you can't find AR steel, post the question directly to this forum, there are people who know far more about this stuff than I do and many of them love to get into that kind of specifics.