Crusher, why not?

All things antweight

Moderators: BeligerAnt, petec, administrator

Lowtech
Posts: 56
Joined: Thu Aug 11, 2011 11:02 am

Crusher, why not?

Post by Lowtech »

I've invested in the parts for another robot. Without thinking about the practical aspect, I decided to make it a crusher. Later I thought "Why aren't there more crushers in antweight combat?".

Firstly, I would like to appeal to people to please name as many crusher antweights as they can, to alleviate me of my ignorance...

Secondly, this is my 10 cents:
The physics at this scale means materials have a much higher effective strength. In my research I discovered a metric known as punching pressure (the pressure required to punch through a sheet). I haven't done the following calculation myself, but plugging in the numbers it appears that a 1mm thick piece of polycarbonate takes about 23kg of mass placed of the area of 1mm**2 to be punched. That's a lot!!!

My new antweight will have a crushing weight equivalent force of about 5kg, which keeping everything else constant means it will be able to punch just 0.23mm of polycarbonate.

That doesn't necessarily mean that there will be no damage. The tip of the crusher is less than 1mm**2, so there is some scratching potential. Nevertheless, I'm disappointed.

Pictures to follow.
Firestorm-in-a-teacup (2WD front hinged flipper)
Hydrant (4WD crusher) (in progress)
Dazmund
Posts: 36
Joined: Wed Dec 27, 2017 10:38 pm
Location: Deptford, London
Contact:

Re: Crusher, why not?

Post by Dazmund »

The only one I've seen is Dark Eagle on a YouTube video. That's it. I'm no engineer or physicist or any sort of scientist, but it still sounds like a good grabber/control bot.
DAZ DUZ BOTZ

Fili-PA (wedge flipper)
Watta Doze (tank tracked pusher)
Wolfhead (front wheel drive flipper)
2-2 Liftman (fork lifter)
User avatar
MarkR
Posts: 362
Joined: Mon Dec 18, 2017 12:46 pm
Location: Reading Hackspace
Contact:

Re: Crusher, why not?

Post by MarkR »

I think it's yes - related to physics, but also the more mundane - availability of parts.

The hydraulics which some heavies use, are somewhat tricky in Antweight. The only way I can see it is to use bicycle hydraulic brake parts, but those are very specialised. Ideally you'd need some way of getting a huge mechanical advantage.

Lead screws - a possible way - but would need to be very robust and light enough and not have too much resistance etc, when under extreme pressure. I think there is possible mileage in a high-ratio N20 + leadscrew combo, but getting the right screw could be difficult.
Robots: Betsie - RaspberryPi controlled flipper bot with gyro stablisation - too clever for her own good?
Stacie - tidy flipper; 4wd driven by hair bands
Lowtech
Posts: 56
Joined: Thu Aug 11, 2011 11:02 am

Re: Crusher, why not?

Post by Lowtech »

Dazmund wrote: Wed Jan 27, 2021 8:41 pm The only one I've seen is Dark Eagle on a YouTube video. That's it. I'm no engineer or physicist or any sort of scientist, but it still sounds like a good grabber/control bot.
That's the most effective crusher I've seen so far!
Firestorm-in-a-teacup (2WD front hinged flipper)
Hydrant (4WD crusher) (in progress)
Henwilled Antweight team
Posts: 22
Joined: Mon Dec 03, 2018 9:57 pm

Re: Crusher, why not?

Post by Henwilled Antweight team »

Im in the process of creating a crusher and it is almost finished, using a 25kg servo (soon to be 35kg), I calculated the actual force it would produce at 25kg and it was around 7kg to the tip.
Lowtech
Posts: 56
Joined: Thu Aug 11, 2011 11:02 am

Re: Crusher, why not?

Post by Lowtech »

Henwilled Antweight team wrote: Mon Feb 01, 2021 11:40 am Im in the process of creating a crusher and it is almost finished, using a 25kg servo (soon to be 35kg), I calculated the actual force it would produce at 25kg and it was around 7kg to the tip.
Very nice. If you can put it together it'll beat my new crusher by 2kg weight equivalent force!
Firestorm-in-a-teacup (2WD front hinged flipper)
Hydrant (4WD crusher) (in progress)
Lowtech
Posts: 56
Joined: Thu Aug 11, 2011 11:02 am

Re: Crusher, why not?

Post by Lowtech »

Image

Introducing, Hydrant!

(Or Electrant if that name is taken)

Details:
  • 4wd
  • 5kg crusher
  • 134*100*42 mm
Firestorm-in-a-teacup (2WD front hinged flipper)
Hydrant (4WD crusher) (in progress)
Lowtech
Posts: 56
Joined: Thu Aug 11, 2011 11:02 am

Re: Crusher, why not?

Post by Lowtech »

Image

I have mounted the claw and more armour plates. Now, I'm looking to install the drive.

Could anyone please recommend a way of getting or making small tires to fit on a custom hub?
Firestorm-in-a-teacup (2WD front hinged flipper)
Hydrant (4WD crusher) (in progress)
User avatar
Kyro
Posts: 408
Joined: Fri Jan 18, 2019 12:36 am

Re: Crusher, why not?

Post by Kyro »

i use foam to make my wheels... then use fantastic elastic for grip... use more foam than you need and sand it down to size... i put my wheels in a drill and use my powerfile to shape them... I'd suggest either a jig, or make many at once to keep them uniform...

foam floor tiles (for kids to play on) are a decent source of antworthy foam... many colours available... i would get the 10mm stuff over the 7mm
Team Rocket
Esper(4wd flipper)
Mantis (4wd grab 'n' lift)
Dominus (4wd overhead drill bot)
Fennec(4wd flea and 1/2 cluster)
Gizmo (4wd flea and 1/2 cluster)
Lowtech
Posts: 56
Joined: Thu Aug 11, 2011 11:02 am

Re: Crusher, why not?

Post by Lowtech »

Thanks, I'll bear that in mind. Unfortunately I've already committed to nylon hubs. I think I'm going to try cutting up some plastic tubing first.
Firestorm-in-a-teacup (2WD front hinged flipper)
Hydrant (4WD crusher) (in progress)
Post Reply