Servos for Wheel drives

I have with my Spectrum radio, some small servos these are small units 7 grams I think. I was wondering if I could convert them into drives for an ant bot they have an identifier number S75 on them.

Youll need to disconnect /remove the position feedback pot and remove any physical stops that prevent continious rotation.

http://www.google.co.uk/search?hl=en&q=rc+servo+hack&meta=http://www.google.co.uk/search?hl=en...rvo+hack&meta=


This is probably close to the size.

http://www.dprg.org/projects/1998-04b/index.htmlhttp://www.dprg.org/projects/1998-04b/index.html

(Message edited by woody on June 24, 2007)

most likely 99% of servos can be modded. I have not seen inside of them but as long as the output gear is complete it should be able to be modded.

Hello I am new to Roboteering and I am looking to build an Antweight robot as my first project. Has anyone got any advise for me please? Would be greatly appreciated.

You will need a transmitter, a receiver, a receiver battery, two servos and some wheels. Modify the servos for continuous rotation (if you dont know what to do post here, people will help). Once the servos are modified attach some wheels (I use my sons lego wheels)and plug the servos into the receiver. With the receiver powered by its battery, the sticks on the tranmitter will make the servos run backwards or forwards. Thats it. Glue the servos down to a base of some kind and you have a robot. Fight it, rebuild it, fight it again.

Hi Michael, so much to say.

Firstly, check out http://www.robotwars101.org/phpBB/http://www.robotwars101.org/phpBB/
Youll find tons of advice there, you might also want to check out my advice on building an antweight in six easy steps at http://windisch.co.uk/robots/howto/build_a_robot.htmhttp://windisch.co.uk/robots/howto/build_a_robot.htm
(although the technology is a bit out of date now).
Look to spend about £150 for a decent robot plus specialist tools.

And finally, come along to a competition if you can. Reading Robot Club http://windisch.co.uk/robots/rrc/rrc13/index.htmhttp://windisch.co.uk/robots/rrc/rrc13/index.htm
is this Saturday and the next competition is near Hillingdon, West London on 17th November.

Simon

But if £150 seems a lot to you, you can probably build a working antweight, able to take part in competitions, for £30 or so. Get a used 27 mhz transmitter and receiver from a model car enthusiast or try the used shelf of a big hobby shop. Get servos from the same source. If all that fails, you can order a new 40 MHz transmitter with receiver, two servos and wiring harness from Technobots for around £40. The receivers you get this way will be big and clunky by ant standards but are fine to get you going and into competition with a first robot.

I agree, the robot kits I bought for a school club cost £60 each, although that didnt include a transmitter or battery charger, or crystals come to think of it.

SImon

I made robot kits out of a pair of Technobots transmitter/receiver servo starter kits that cost a bit under £40 each. The resulting robots were probably a bit over 150g but it didnt matter for the application and it would have been possible to bring them in under 150 g. The only mods needed were to fix the servos for continuous rotation and to make a battery pack that takes 4 AAA to replace the one supplied that took 4 AA. The Technobot kits come with a set of crystals.

The skysport 4 Technobot sells for gbp 34,96, 2 standard S3003 servos is 8 pounds each, so you would have 51 pounds for an antweight pushbot, or 59 pounds for a antweight with servo lifter or axe.

You can currently buy a 40 MHz, AM transmitter, with receiver and 2 S3003 servos, from Technobots for £43. Does the Skysport 4 come with a receiver and crystals - well worth the extra money if it does.
What is the weight limit for a super ant? Is it 250g or 300g?

Super ant is 250 grams.
Regular antweight is 150 grams
Flea is 75 grams

Ah, weve given up on Super Ants, nobody was building them any more.

Simon

Too bad. In the US, where I competed this summer, they have 454 g antweights. Good fun and powerfull machines.

we call those sozbots.

So does a class exist for them in continental Europe or the UK?

Officially DRG does carry sozbots, although we never had more than 3 in 3 years. The finnish roboteers do have some more.


(Message edited by leorcc on October 12, 2007)

Quote:
Too bad. In the US, where I competed this summer, they have 454 g antweights. Good fun and powerfull machines.
Anyone can build a powerful machine in 454 gms it takes more skill to do it at 150gms. There are many real ants (150gms) that can destroy another robot in one hit or at the very least fire it off into the polycarb arena cover. Ask Leo to post a picture of Katjuscha if you want to see what can be achieved.

A picture of Katjuscha (148 gram) is on my profie.

I rest my case

Peter is too modest to say so, but his robots have been known to kick a few bots, heres nothing like the sound of a robot hitting the side of the battle box. http://www.pix01.com/gallery/AD15DA26-5D38-4DA7-9655-0A4E1F24AB12/Reading_Robot_Club_12_-_RRC12/image2.jpghttp://www.pix01.com/gallery/AD15DA2...Reading_Robot_ Club_12_-_RRC12/image2.jpg
http://www.antweight.co.uk/results/ws22/images/DSCF1930.jpghttp://www.antweight.co.uk/results/w...s/DSCF1930.jpg

Peters robots have knocked the wind out of Katjuscha in more than one occasion.

I think that a good builder can build a competative machine in any weight class. But if, as Peter says, it takes more skill to do it at 150gms then this would seem to me to be an argument in favour of higher weight classes to give newcomers a better chance.

Yes thats why we originally had Supers but we were lucky to have one enter per competition, so they had no one to fight anyway, so we thought why not just focus on ants instead.

Simon

(Message edited by Simon_Windisch on October 13, 2007)

So Michael, how do you feel about it now? I think the instructions given for converting to continuous rotation are unduely complicated. I just cut the tab off the relevent gear in the servo and disconnect the mechanical link to the potentiometer, leaving the pot in place and not trying to replace it with resistors. Some people null the pot (so the servo does not rotate with the transmitter stick at neutral) and put a drop of glue on it but I just null it and forget about the glue.
Another approach is to buy servos which have been modified but these are more expensive. Yet another approach is to buy servos like the Ripmax SD 200 which only require the removal of an internal collar to modify them for continuous rotation. They are lighter than the 3003s, which can be good or bad, depending on your design, but usually good.

i got some servos too. sorry just an excuse to post here :)

Wot not building an ant!! Shane
Enviant??

ive updated my profile picture with some of the antweights ive built.

So you have an indication of what can be done in Antworld :)

Like wise I have added a picture of my 8 ants 3 minisumo and 1 micromouse to my profile.

can i just say i am impressed with your creations tim and peter.

you can :)