need help

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haz
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need help

Post by haz » Sat Apr 17, 2010 10:03 am

hi im new to antweights and have bought some servos and a radiolink 2.4ghz transmiter and i wondering what should i do so i don't break anything because im poor and i cant afford much :D

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razerdave
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Post by razerdave » Sat Apr 17, 2010 10:09 am

Hey Haz

First off, welcome to the forum :)

Second, what servos did you get ? Modifying servos for 360 degree movement should be simple in all servos but its helpful to know which ones you're using.

haz
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Post by haz » Sat Apr 17, 2010 10:32 am

i got 3 sd200 servos are they any good

alasdair
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Post by alasdair » Sat Apr 17, 2010 11:50 am

I used to use SD200s on DisobidiANT. COMPLETE NIGHTMARE! Firstly, the new kind of SD200s dont have a guide on the internet. We had to work out how to do it ourselves. Then, they kept blowin up! I think there are 5 blown SD200s and one working in my bitz box at the mo. Go for gearmotors i say! :wink:

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Team Orr
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Post by Team Orr » Sat Apr 17, 2010 3:00 pm

never had a problem with them myself....
"if it wasn't for Edison we'd be watching TV by candlelight"
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bitternboy
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Post by bitternboy » Sat Apr 17, 2010 3:14 pm

Me neither, I think saying they blow up, and constantly at that is exaggerating. I've been using a pair since the beginning of my antweight hobby and I've never had a problem. Just out of interest, what voltage were you using them on Alasdair- that may explain them failing. To haz, all I can say is to stick with them and run them on 6v since they sacrifice a fair amount of speed for torque and are a bit of a pain at 4.8v. Hope this helps. :D
Jonathan Atkinson
Before you criticize another person, first walk a mile in their shoes. Then, when you critisize them, you'll be a mile away and have their shoes.

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BeligerAnt
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Post by BeligerAnt » Sat Apr 17, 2010 3:17 pm

Hi Haz and welcome!

The idea behind modifying servos for 360 degree rotation is the same, even if the exact method varies between servos and people.

The 3 things you need to do are:
1. Remove any mechanical stop that prevents the final gear of the servo from rotating 360 degrees. This may be on the gear or the case.
2. Disconnect the output gear from the feedback potentiometer ("pot'"). Sometimes this involves drilling out the gear, or some other method.
3. Fix the feedback pot' at its mid-point. This can be done by gluing the pot' or replacing it with 2 fixed resistors, depending on how handy you are with a soldering iron.

There are various mod guides around. If you can't find one that exactly decribes your servo, you should be able to piece together what you need to do from bits of each guide and some common sense. If you get really stuck, ask here - pictures help!

Before you start, connect the servos up to the receiver and battery, and check that the servos operate correctly. There's nothing worse than trying to modify a broken servo!

Use large wheels. Servos are not very fast, so bigger wheels will stop your 'bot from being too snail-like. Aim for 70mm+ diameter.

Hope this helps. Take it slowly and carefully, check everything, and you should be OK.
Good luck!
Gary, Team BeligerAnt

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Team Orr
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Post by Team Orr » Sat Apr 17, 2010 3:25 pm

bitternboy wrote:Me neither, I think saying they blow up, and constantly at that is exaggerating. I've been using a pair since the beginning of my antweight hobby and I've never had a problem. Just out of interest, what voltage were you using them on Alasdair- that may explain them failing.
+1

@ haz: iv been running a pair of sd200's in valliant since the begining, an iv never had them fail yet (well...unless you count the time my dad sat on it...and i dont :p) so stick with them, get a robot together and come to some events, once your there you will pick it up pretty quick :)
"if it wasn't for Edison we'd be watching TV by candlelight"
Jack Orr
Team Orr Robotics

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bobblebot
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Post by bobblebot » Sat Apr 17, 2010 4:58 pm

SD200s have been running in Bobblebot for the last 7 years, no problems with reliability here.

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peterwaller
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Post by peterwaller » Sun Apr 18, 2010 11:12 am

Welcome to the board Haz. As you can see by the number of replies new people are always welcome into antweights. The only advice I would add is to try and get to one of the less formal events first where you can talk to the other roboteers and check out the other robots. You don't give any indication where you are from but next month there are events at Aylesbury 9th May and Reading 26th May. Even if you don't have a working robot yet you would gain a lot of information and I am sure someone will let you have a drive.

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Simon Windisch
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Post by Simon Windisch » Sun Apr 18, 2010 7:06 pm

Has Bobblebot competed?

Simon

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Flippt
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Post by Flippt » Mon Apr 19, 2010 8:21 am

bobblebot wrote:SD200s have been running in Bobblebot for the last 7 years, no problems with reliability here.
I think there is a slight difference between "Driving" for 7 years or "fighting" for 7 years using the same servos
Image
Swedish style!
Fight Robots, Not Humans!

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bobblebot
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Post by bobblebot » Mon Apr 19, 2010 5:50 pm

I probably should have clarified... no Bobblebot hasn't entered any formal competitions (it has had many test fights) and I would be amazed if anything ran in a competing Antweight for that amount of time. I'm well aware that the relatively gentle life it has enjoyed is not the same as full on combat :wink:

haz
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Post by haz » Wed Apr 21, 2010 4:46 pm

thanks modefied the servos without breaking them and am now stuck on the rc aspect of my ant i have bought a radiolink 2.4ghz transmiter and receiver and wired it all up and i didn't work i don't know why it wont work (maybe it dont like me :D) could some one help me :-?

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Simon Windisch
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Post by Simon Windisch » Wed Apr 21, 2010 5:30 pm

Reigate's not too far from Burgess Hill, you could pop to the show on the weekend with your stuff and we could sort it out for you?

Simon

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