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Hi im making a bot and im using 4 windscreen wiper motors i think or 4 planetary geared motors, who knows. anyways id like to know if a 4qd RC interface would work with electronize speedos to produce a tank steering type robot with 4 low wattage motors.
No need for a 4QD interface, thatd be a waste of money. You only need two electronizes and a mixer (about 15.00 for the mixer)
TO produce tank steering you would not even need a mixer.
So Mark ....just 2 Electronize speedos.....NO mixer or interface.
One speedo will control 2 motors on one side of the bot from 1 stick on your transmitter.
Just plug the Speedo/s into the relevant receiver output/s.
ok what ratings do i need. would a 10a+5v suffice? and do i need a four or 2 channel receiver
ok i know im a complete newbie aswell, but my understanding is that with a 2 channel receiver all you will be able to do is drive it about as each electronize will take up a channel, if you want any weapons or for it to do anything else you will need a 4 channel one.
I hope someone comes along and proves me right :)
A 10A + 5 with 2 motors sharing it. You may be pulling alond the lines of between 10 and 25 amps per motor depending on your drive.
and yes, Andrew is right. You need 1 channel per moving part on your machine. A minimum of 2 for drive and more for any weapons/schrimechs.
I feel like you 2, Ive been with Team MORG b4 and now trying to build a featherweight on my own, it feels like Im starting from scratch... Keep it up both!
I know some has probably put this up b4 but it is still the best guide for building a featherweight I can find on the internet.
http://www.stupoo2000.pwp.blueyonder...technical.htm>
Ceri, ive been with typhoon for 4 years, i know what you mean
Its great that there are new people on the forum asking questions and we now have a good few more feathers and by the sounds of the questions they will be fantastic machines!
What kind of batteries should I be looking atfor four 12v feather golds? Would i need four, two each side in series to give 24v. And what Ah rating would you recommend. Do the electronize speedos allow you to reverse the motors so the bot can reverse
well, you will want to wire the batteries up in parralell to give 12v but double Amp. Wire both speedos to the same batteries as this will save you alot of weight rather than having two seperate battery packs! The electronize speedos do give forward and reverse control for your motors so there will be no problems in controlling your robot. Are you running 4 gold motors for your drive? i use 2 24v for drive, and a 12v overvolted to 24v on my weapon. i use 3.3Ah NiHm batteries and that gives me enough power for atleast 1 to 2 battles.so that should be fine for you.
I personally would recomend a Ni-cd bot pack at 24v. However if you cannot afford that then I would recomend a 4-5amp SLA battery.
i was planning on using four 12v golds, 4 12v 3.3ah slas, 2 for each side. Then wiring motors and batteries in series to give 12v to each motor and the same amount of current. Altough if you think 2 24v golds would suffice then ill consider that.
Id go add up how much that would all weigh before you go much further !
Ed
http://www.teamstorm.comhttp://www.teamstorm.com
weights not a problem. trust me. and it weighs about 10kg
so if i wire the batteries in parralell, would i wire the motors in parrallel?
Mate weight would be a problem with that robot.
Again you gear down a gold and include a wheel I would say 1.5kg would be a fair enough estimate. 3.3amp hour SLA batteries weigh 1.3-1.4kg each. The two electronises weigh 0.5kg total. Add another 0.5kg for receiver, wires, link, rx battery etc.
SO thats:
4x Golds and Gears: 4x 1.5kg= 6kg
4x 3.3amp 12v SLA: 4x 1.3kg= 5.2kg
2x Electronise 30amp: 2x 0.25kg= 0.5kg
1x Receiver wire etc: 1x 0.5kg= 0.5kg
Total: 12.2kg
That does not include any chassis, armour, bolts or anything else. There os absolutely no way those parts in that number could end up underweight.
I would recomend:
2x 24v Gold motors: 2x 1.5kg: 3kg
2x 5amp sla in series: 2x 1.6kg= 3.2kg
2x Electronise 30amp: 2x 0.25kg= 0.5kg
1x Receiver, Wire etc: 1x 0.5kg= 0.5kg
Total: 7.2kg
Remaining weight: 4.8kg
That should be enough for a decent chassis and armour.
Regards
Ian
Mark, weight is a problem if youre trying to fit 4 Gold motors, wheels, drivetrain and 4 12v 3.3ah SLAs into a 12Kg feather
..... trust me.
Ed
http://www.teamstorm.comhttp://www.teamstorm.com
If you think you can get all that lot inside 12Kg....
Go ahead try it. Were not gonna stop you.
My main concern is that you have a tradeoff between drive power and armour. Even if you have managed to get this full drive in at 10Kg, are you sure that the remaining 2Kg would be enough to protect these precious parts?
There are quite dangerous spinners around. (Eds Vortex being one of them.) and they could cause a lot of damage to your robot in battle.
Just concerned thats all.
Oh and Im looking forward to fighting more feathers as soon as Ive finished building. I vant to trash them all! *Evil laugh... decends into coughing* Boy, what a nasty cold I have, ahem. Oh and I said the word with because help is still up for debate...
well no the weight limit is 70kg but the dimension limits are that of a feather or about so SPACE is the issuse. Yet i understand your concern and i suppose if we wanted to enter normal competitons we should try to comply to a normal limit. Thanks for the help and i know im a noob to this. If I had it my way and went against the advice of the BNFL engineers id have bosch 750w motors in there but i doubt we would have the room, but definetly have enough weight.
Could someone tell me the dimension limits of a featherweight. Hope to see some of you if we get to take our bot beyond the competition were in.
I dont know if i have special electronize or something but mine only weigh 100g a piece
Mark to answer your question, yes you should wire your motors in parallel, this way they both get the same voltage from your batteries.
this does not however mean you have to wire the batteries in parallel, they can be in series
just a suggestion Mark, if you are wanting to use so many SLA batteries, why nopt just get one large 7Ah or so 12v SLA that alot of heavy weights use? link the speedos directly to that and away you go!! it will last for AGES, no problem with you weight as you say and much simpler to wire everything up??
oh yer, Ians maths is probably a little on the fuzzbuzz side. considering each gold only weighs 800g my gearbox weighs less than 100g leaving alot more weight. I think the limit is 1m cubed isnt it? though. why you building to feather sizes?
Well i was taking using mod one gears and wheels so might be a bit heavier than your 100g gear box but I was making a point. As for 250g for an electronise well I have the expernal relay modified ones and with relays they weigh in at just short of 250g so left them at 250g for handyness.
is it against the rules to power a bot with a hamster in a spinning wheel?
No, but you would still have to find somewhere to site the removable link.
Ed
http://www.teamstorm.comhttp://www.teamstorm.com
would be interesting of you could lol. what if the hamster was the link? put it in the wheel and clip a harness round its neck that u plug in as the link! when the links removed, so is the hamster :) wasnt there a rule at somepoint in RW saying that organic materials cant be used or something?
Im contacting the RSPCA! LOL.
Mr Stu
we havnt done it yet stu, so i wouldnt bother phoning them :) Its taking me too long to draw the hamster on CAD! means i cant do anything until its done. By the time i finished the first drawing of it, it grew :sad:
LOL!
Well then you should measure its speed of growth and then componsate. LOL!!
Mr Stu
so what weapon are we going to put on it :)
lol. Does anyone know how i can measure how long a battery would last at a certain wattage and voltage etc.
quote:
so what weapon are we going to put on it
May I suggest using a gerbil so that it can gnaw your opponents into submission..... eventually :)
Not exactly Chompalot, more like Chewabit :proud:
Can someone please tell me how i calculate how long a battery will last
Heres how Id do it.
Volts= Joules/Coulomb
Amps= Coulombs/second.
For a 5 amp hour battery, that would be 5 * 3600 (secs in an hour) = 18000 coloumbs
at 30 amps 18000 Couloumbs (storage)/ 30 (rate) = 600 secs. Roughly 10 minutes.
Thats how Id do it anyway. Some1 is now bound to bring in an complex efficiency factor on the battery, but thats the basic physics.
Though its not that easy with the hamster.. :mrgreen:.
You cruel buggers. How can you expect a hamster wheel to spin at a 10:1 gear ratio? Even Im not that cruel to animals!
On the plus side, It appears to be the energy source of the future. According to Star Trek: The Next Generations engineering panels, a hamster powers the Enterprise Ds warp drive...
i love gerbils
Ok say i was gonna use four windscreen wiper motors what could i expect to get out of them e.g. speed rpm torque and what voltage etc. i need to use. Lets not have a discussion about weight etc.
I think they are about 150rpm when ran at 24volts, with a decent amount of torque. You would also need fairly large wheels (minimum of 200mm) and still would be slow.
so basically you wouldnt expect to get much speed out of them but a reasonable amount of torque. How much torque would you expect roughly. Can they be safely run at 24v?
mark you can get some decent speed out of them if you do what i am doing. Ive tore off the gearbox and am using cogs and chains to regear the motor. they can be safely run at 24v.
If you send me an email i can give you some pics and more info on what I am up to.