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Antweight workshops / Build Tips.
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marto
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Antweight workshops / Build Tips.

So hopefully my pile of antweight parts will be here next week.

I don't have much experience with antweights. I am wondering if anyone has any tips for building them. For our workshops we are looking at the 150g class which means modified servos for drive and I was thinking just making flippers/lifters.

If anyone has any pictures/links/tutes or experiences they would like to share if you could post them here would be greatly appreciated.

I will be doing up a tutorial and should have it posted here in a few weeks.

Steve
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Post Sun Feb 14, 2010 11:07 pm 
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Knightrous
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Check out the Antweight forum over at RobotWars101 . Pretty much have the best information and people with experience gathered on there.
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Post Sun Feb 14, 2010 11:39 pm 
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kkeerroo
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Well here is what I've built:


I call it Smoko because that is when I made it. It is clearly not finished.
2 standard $10 servos and one high torque, small FM receiver and an old AA battery pack all on a bit of Milo tin and milk bottle lid wheels. The half finished lifter arm will likely have another bit of tin for a bulldozer blade and it will all be covered with half a water bottle.

Weight so far = 300g

that is: 35g per servo
100g for batteries
most of the rest in the lifter arm

no idea how to build it under 150g without going to micro servos and lipols.
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Post Mon Feb 15, 2010 7:32 am 
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Knightrous
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quote:
Originally posted by kkeerroo:
no idea how to build it under 150g without going to micro servos and lipols.

That's pretty much the solution, but fortunately it's a cheap one. There is a large range of <$10 micro servos and <$5 lipo packs to suit antweights at hobby city.

A few examples.

9gram micro servo $3.00 - 9gram, 75RPM @ 6v
3S1P 360mah Lipol $4.30 - 10gram

Using those two parts along brings your drive and batteries in under 40grams, using some thinner aluminium (1-2mm) would make the lifter heaps lighter too.
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Post Mon Feb 15, 2010 9:16 am 
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Daniel
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What weight class are you guys building to?
And remember I have owned an ant weight arena for 6 years that has barely been used.

Post Mon Feb 15, 2010 3:29 pm 
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Knightrous
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UK Antweight - 150g + 4" cube
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Post Mon Feb 15, 2010 5:12 pm 
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marto
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I am fairly impartial to US or UK. I am thinking UK as it will be cheaper than the US ones which is the primary concern atm.
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Post Mon Feb 15, 2010 7:28 pm 
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marto
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Antweight parts arrived today.

2 cell turnigy 500mah batter - 35g (full leads)
HXT900 micro servo 11.1g (full lead no horn)
70x18mm wheel 12.3g
Turnigy TGY-533175 servo 19.9g (full lead no horn)
HobbyKing RX 8.5g. (with one antenna and in case.)

Total weight. 100.2g
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Post Tue Feb 23, 2010 1:10 pm 
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Knightrous
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You can save 4g by taking the rx out of the case and another 13g by using a Rhino 360mah 2S lipol pack (22g). You could get away with a 130-150mah pack for just running servos and have another 10-12g saving. Gives you plenty of weight to make an awesome design Cool
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Post Tue Feb 23, 2010 1:17 pm 
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marto
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Were out of stock of 360mah ones so had to go next biggest.

Now how the hell to attach these wheels????
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Post Tue Feb 23, 2010 1:22 pm 
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Knightrous
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Epoxy the wheels to the servo horns.
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Post Tue Feb 23, 2010 2:05 pm 
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marto
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Modded one servo for continuous rotation. It sorta works.

Very jumpy and seems to get rather hot and one way goes better than the other.

Gunna check my solder connections and do another to double check.
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Post Tue Feb 23, 2010 3:04 pm 
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kkeerroo
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I have ordered the parts for a 150g shell spinner.
Turnigy 3020-14T brushless with a Turnigy Plush 12A controller, a couple of 4g sub-micro servos and a couple of 400mAh LiPo cells.
All up about 60 - 65g and just under $45.
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Post Tue Feb 23, 2010 3:14 pm 
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marto
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Apparently the servo jittering is not helped by running at a higher voltage. 8.4V out of a freshly charged 2 cell lipo is pretty out of spec.
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Post Tue Feb 23, 2010 6:49 pm 
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Knightrous
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Stick a 7805 or 7806 regulator on the servos. Seen it done for antweights that use 11.1v for a weapon but only 4.8-6v micro servos for drive.
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Post Tue Feb 23, 2010 8:08 pm 
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