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Since we now have a few robots I thought we'd make a new thread for the team and put everything there.
First up some photos!
First up some photos!
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Re: Team Bitza
Some help required.
I need to control, via R/C what I believe to be a SPDT/CO switch...
The actual switch has three positions, centre is off left is on on and right is the other. Can someone advise a suitable RC switch to control this please?
Don't want to use servos.
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Re: Team Bitza
Any one?
I think this will do it:
http://www.ebay.co.uk/itm/2-WAY-Radio-C ... 3379e61eb9Comment
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Re: Team Bitza
What MOD gears do people typically use in FWs?
As far as I can tell MOD is simply the distance between teeth on the gear, is that correct?
Also, am I correct in thinking that gearing ratio between 2 gears to be the division of how many teeth each has?
So a 5:1 reduction would be achieved with a 10T pinion and a 50t spur?Comment
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Re: Team Bitza
Yep, nailed it in 1.
I use Mod 1 gears in Satanix. Not had them wear out yet.Comment
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Re: Team Bitza
What sort of top speed do people aim for when doing their gearing reductions? About 10mph? Or higher?Comment
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Re: Team Bitza
Our machine can do about 10mph and it feels plenty fast for a small arena. A 12v drill setup at 12v does about 7mph. Maybe use that as a guide?
Unless you're confident your drive motors will get you to 10mph quickly it's perhaps best to aim a little lower?
Is this for a new machine or Bitza upgrades?
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Re: Team Bitza
New machine, on paper works out at 3hp in the drive! All made from bits and bobs, just trying to figure out a suitable gear reduction.Comment
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Re: Team Bitza
THATS my kind of robot
that's like 20x more powerful than gimsons
i don't beleive it will work but just hope someone is clearing out their cellar and saying,
do i really need this binfull of rare earth magnets.
3hp isn't going to stick to the floor
and guess what.
USLESS POINT OF REFERENCE:
http://shop.mobileweb.ebay.co.uk/search ... Kw=true&cm
d=SREF
nopeComment
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Re: Team Bitza
No magnets, unless we happen to find some, we do have some incredibly wide wheels though!
So what sort of top speed do people aim for? Cobalt seemed a good speed, Satanix perhaps too high, the new Aftershock had good drive, 540 moved like a fly!Comment
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Re: Team Bitza
i think its good to have a higher top speed than you would maybe use all the time, however you don't want it crazy so you can't control it. Plus i'm guessing you'll only be using this in the RC arena which isn't huge so i think 10mph top end would be goodComment
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Re: Team Bitza
Given these statements would it be a good idea to gear for a top speed double what you want so you're running 100-50% Torque and 0-100% Horsepower over the speed range you'll actually likely achieve?PMDC motors have the following characteristics:
They produce their maximum torque at zero RPM.
They produce zero torque at their maximum RPM.
They develop their maximum horsepower at 50% of their maximum RPM.
At 50% of maximum RPM, they produce 50% of their maximum torque.
At maximum horsepower, they are no more than 50% efficient.Comment
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Re: Team Bitza
No... The balance to be made is between torque and speed, making your gear reduction half what it would otherwise be will slow you to a ridiculous extent as your acceleration would be hopeless. 'Horsepower' doesn't really matter, it's just a hint at torque/speed characteristics which you should be designing around. The best thing is to use the tentacle calculator to try some gearing combinations with a motor similar to yours, and enter a realistic tire coefficient then you can click the 'acceleration' button for more information: http://www.architeuthis-dux.org/torquecalc.aspComment
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Re: Team Bitza
Thanks for this.
I think I found an appropriate motor, not sure what I'm looking at though or what my tyre friction coefficient would be, or how I can find it.
Any idea how big the RC arena is corner to corner?
Also what's a good effective pushing force figure / time to top speed?
I get 27lbs and 0.7s
Cheers,Comment
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Re: Team Bitza
care to share your link to the mythical motors?
or are they your secret?Comment
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