Another New Antweight..

All things antweight

Moderators: administrator, BeligerAnt, petec

Post Reply
Rapidrory
Posts: 1160
Joined: Sun Nov 24, 2013 9:54 pm

Another New Antweight..

Post by Rapidrory » Fri Jan 03, 2014 10:34 pm

Hi guys, Rory here..

I'm just joining the Antweight scene, (having been talked into it by Alex (Haywire)) and as such have started work on a robot to play with :P

The robot I'm building is an Alu/Polycarbonate flipper.. I've ordered all the relevant parts (most are from the US branch of Hobbyking though so could be waiting a while..) and have started work on the chassis.

At the moment I only have the aluminium part built, which holds the motors and all the other electronics..

Image

The servo I plan to use for the flipper is a Turnigy XGD-11HMB. The specs on it seem to good to be true at 3.5kg/cm torque, 0.09 sec/60deg, 11g, all for £3.35. It does have a nylon/metal gear train, which may be a bit weak, but I'm still a little sceptical about it. At least its hardly a huge waste of money if it's not suitable...

Having more or less finished the alu part and fitted the wheels, I wanted to try it out to check the motor speed was right/ because it's fun :wink: However all my parts are still on their way from the US... Sooo, in an attempt to redefine the meaning of 'lash-up', I had a rummage around in the attic and found an old dual channel 40MHz RC kit.
Took apart the two servos and had a bit of a resolder to make a dual ESC, then taped the rest of the receiver in with some AA batteries...

Image

Works surprisingly well all things considered, however some how don't think it's a competitive setup just yet :P

Also have plans for another little flipper, but that's for another day :L
Rory Mangles - Team Nuts

Robots: Nuts 2 and many more...

NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

haz
Posts: 1840
Joined: Thu Apr 15, 2010 11:20 am
Location: Underwater Lair
Contact:

Re: Another New Antweight..

Post by haz » Fri Jan 03, 2014 11:11 pm

That's pretty cool man, well done.

I like the folded alu.

Harry

Remote-Controlled Dave
Posts: 3716
Joined: Sun Apr 03, 2005 5:30 pm
Location: Antrim, Northern Ireland
Contact:

Re: Another New Antweight..

Post by Remote-Controlled Dave » Fri Jan 03, 2014 11:50 pm

The thrown together version looks like mine do when they're finished.

It's a great start though. Is the aluminium chassis all hand made? Tin snips and a tape measure type job? The motor mounting is cool.
Die Gracefully Robotics
Winner - AWS 39

User avatar
earthwormjim
Posts: 1190
Joined: Thu Sep 16, 2010 4:57 pm
Location: Secret Undisclosed Moonbase Location

Re: Another New Antweight..

Post by earthwormjim » Sat Jan 04, 2014 11:12 am

Nicely done Rory! Looks really good, well done on the metal work so far. I am suprised the 2x 360 degree folds didn't crack! Looks like you are making good progress!
I get most of my ingredients from hobyking. Sometimes they are quick. :) , sometimes they are sloooooooooooooooooooooooow. :(
You never can tell! :roll:
Image

Rapidrory
Posts: 1160
Joined: Sun Nov 24, 2013 9:54 pm

Re: Another New Antweight..

Post by Rapidrory » Sat Jan 04, 2014 3:55 pm

Yeah, the chassis is all hand cut and folded... by folded I mean beaten with a hammer a lot in an attempt to get it looking roughly like it was supposed too..

No CAD used in the design either; spent many hours sat on my floor with a geometry set, a calculator, and lots of paper :P

Fitted the polycarbonate bits now... Came in only 0.6g over what I thought it would weigh, so that should be easy enough to deal with.

Image

Need to give it a bit of a polish up first, but otherwise it's almost done.

This is the other little robot I'm working on:

Image

It's a little flipper called Tinny :) Not meant to be competitive; more just an interesting mint tin project!
Rory Mangles - Team Nuts

Robots: Nuts 2 and many more...

NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

Remote-Controlled Dave
Posts: 3716
Joined: Sun Apr 03, 2005 5:30 pm
Location: Antrim, Northern Ireland
Contact:

Re: Another New Antweight..

Post by Remote-Controlled Dave » Sat Jan 04, 2014 11:39 pm

Starting to look great! Both of them. Never say that about "not meant to be competitive" though, cos it means almost certainly that it'll progress further than your "proper" robot through an AWS :-P
Die Gracefully Robotics
Winner - AWS 39

razerdave
Posts: 1534
Joined: Mon Jan 02, 2006 9:40 pm
Location: Carterton, Oxfordshire
Contact:

Re: Another New Antweight..

Post by razerdave » Sun Jan 05, 2014 2:47 pm

Dave's got a point, I built Bulletproof as a drive all day robot, it has a better AWS record than Stewir or Baby Hell do!

Rapidrory
Posts: 1160
Joined: Sun Nov 24, 2013 9:54 pm

Re: Another New Antweight..

Post by Rapidrory » Sun Jan 05, 2014 5:48 pm

Haha, that's quite possible :P

Btw, has anyone got any ideas about wheels I could use for Tinny? Need to be about 20mm in diameter and fit a 3mm D shaft... The motors I'm using are from RS and so only have a 5mm long shaft, but otherwise they're much the same as the ones from Polou.

I've looked at using Lego wheels or making some from scratch, but mounting them on a D shaft properly has so far been unsuccessful...
Rory Mangles - Team Nuts

Robots: Nuts 2 and many more...

NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

Remote-Controlled Dave
Posts: 3716
Joined: Sun Apr 03, 2005 5:30 pm
Location: Antrim, Northern Ireland
Contact:

Re: Another New Antweight..

Post by Remote-Controlled Dave » Sun Jan 05, 2014 7:10 pm

I have the same issue with the d-shaft. Getting wheels to fit that aren't already purpose made or printed is a pain. The best solution I had was Rhys gave me some d-shaped 3D printed inserts that you glue inside the hole on a Lego wheel. There are a few people on here who have their own 3D printer so maybe you could strike a deal with someone? Mind you, if you can do that, you could just get the whole wheel made...
Or ask someone who knows how to do it, haha.

BTW, I think you should rename Tinny 'Curiously Strong Peppermints'!
Die Gracefully Robotics
Winner - AWS 39

Rapidrory
Posts: 1160
Joined: Sun Nov 24, 2013 9:54 pm

Re: Another New Antweight..

Post by Rapidrory » Sun Jan 05, 2014 10:13 pm

Hehe, would save me writing the name on it at least :P

Had a thought on wheel mountings; gonna try drilling a 3mm hole in a slightly larger steel bolt, then slide it onto a 3mm D bar and hammer it to get the D shape and tight fit... might work, just have to make sure I can get it off again :roll:
Rory Mangles - Team Nuts

Robots: Nuts 2 and many more...

NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

Post Reply