Antescher Assault Systems build diary

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Paulmchurd
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Re: Another noob bot

Post by Paulmchurd » Mon Apr 30, 2018 12:04 pm

Ahhh sorry I misread it...I still think d-hole wheels/parts are expensive and Chinese sellers need to fill that gap in the market. Too many ideas. I think you should build them all!!!

voorsk
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Re: Antescher Assault Systems build diary

Post by voorsk » Mon Apr 30, 2018 12:35 pm

I'm sure they'll start selling more wheel varieties now that more schools are teaching it to kids. Lots of demand! :)

I realised on my lunchtime wander that using an indirect drive means I don't have to use the D-axled wheels - I can use Lego wheels! Admittedly not very grippy, but I've already got a ton of them. hmmmmmm... :roll:

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Shakey
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Re: Another noob bot

Post by Shakey » Mon Apr 30, 2018 10:07 pm

voorsk wrote:
Mon Apr 30, 2018 11:31 am
I've also got an idea for a bot shaped like an EVE Online Hound, which I think I can build without needing extra parts..
I don't think rust makes great armour. ;)
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voorsk
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Re: Antescher Assault Systems build diary

Post by voorsk » Fri May 11, 2018 8:28 am

In rust we trust, and all that. Is gaffer tape allowed, or is it considered entanglement? :) ooh - rusty paintjob!

Anyway, I made an attempt at mocking up Sprouting Potato's wedge last night. It's supposed to be the more basic of the robots, and I've even ditched the adjustable wedge, but naturally I've given myself issues such as where to put the srimech arm, and how to mount the motors (they're halfway inside the wheels).

Image

Image

Maybe I need to hold off on using those 47x20mm buggy wheels for a bit, but they're so grippy! And orange!

Maybe a bit too orange..

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DieGracefullyRobotics
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Re: Antescher Assault Systems build diary

Post by DieGracefullyRobotics » Fri May 11, 2018 9:00 am

Wheels can never be too orange.

I love your names.
Dave
Die Gracefully Robotics - Barely Even a Proper Team.

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Ocracoke
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Re: Antescher Assault Systems build diary

Post by Ocracoke » Fri May 11, 2018 12:20 pm

Worth grinding down the inside of the wheel so the motor sits more inboard into the wheel?

Never can have too much orange ;)
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voorsk
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Re: Antescher Assault Systems build diary

Post by voorsk » Fri May 11, 2018 5:18 pm

the wheels come in two sections, with a tyre around them. i already cut out the inside of one half, so the motor is 10mm inside.

what I'm worried about is how to attach the motor to the chassis, although i don't think it'll pose a big problem.

i think I'll work out the other bot tonight. this one's a lifter with rotating paddle things called Suspicious Houmous. :)

voorsk
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Re: Antescher Assault Systems build diary

Post by voorsk » Fri May 11, 2018 8:09 pm

is there a name for the sound of a needle scratching off of a record? if there is, pretend i just wrote that - I've had an idea! :D

the watermelon! why does it have to have a weapon? why am i making a wedge when i can make a melon?

I'm making the melon. I've already designed it, so i just need to build it. yay! I'm getting somewhere!! :)

voorsk
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Re: Antescher Assault Systems build diary

Post by voorsk » Tue May 15, 2018 8:24 am

Over the last few days, I've been trying to work out how to do the armour of the melonbot. Having a big, long curve made it rather tricky.

First plan was to have the sides of the slice as part of the top and bottom, kinda like someone joining their fingers together to make slats. It made a good shape (in paper), but I wasn't sure how to attach them together without putting bolts on the top and bottom, which would interfere with the ground clearance, plus there were gaps between the slats which I didn't like much. Access is also a little tricky.

Second plan was the basic one.. I cut out the old taco shape, and a separate piece for the back and sides. I'd avoided it before because it seemed like a less strong idea initially, but at least it wouldn't have the problem of gaps, plus it relied on bulkheads, which would make it even stronger, and didn't have to be made so angular.

I cut it all out of 0.5mm polycarb to test, and hit the first proper snag of the plan: even at 0.5mm, that stuff does not want to do sharp bends! I'm pretty sure the cheap 1mm aluminium bent easier. Also; who's pinched my g-clamps? :x

So, whilst I can make the general shape easily enough, fitting it all together needs a bit more thought. Plus there are other considerations, like where to put bolts, and is making an invertible wedge a good idea when the wheels are going to get in the way?

All part of the learning curve! :D

voorsk
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Re: Antescher Assault Systems build diary

Post by voorsk » Sun Jun 10, 2018 9:41 pm

finally starting to get somewhere, but it's been quite the learning experience! turns out I'm not a natural at this sort of thing. :P

here's how Suspicious Houmous looks at the moment..

Image

it's supposed to be a lifter with fully rotational lifting blades. there's meant to be a strut between the ends, to make it less hit and miss, and rounded at the other end.

things i have learned:
  • drill bits are slippery
    cheap aluminium likes to bend in the wrong way
    buy long bolts and cut them
    nyloc nuts are too long
    make guides if needed
    keep it simple!
my main problem is drilling accuracy. it doesn't seem to matter if i make guides or drill slow or fast.. it always seems to go wrong. think i need to get some kind of pillar drill. :-?

so, this might turn out to be the prototype. i reckon i can build it better second time around, and if not, then it's a good job i was going for a sort of rat look robot!

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GeorgeR
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Re: Antescher Assault Systems build diary

Post by GeorgeR » Sun Jun 10, 2018 10:44 pm

Looking good!

If you can't stretch to a pillar drill or milling machine a centre punch and an eggbeater type hand drill are my tools of choice for accurate drilling. Punch to stop the drill wandering, and slowly drill a pilot hole with the hand drill and a small drill bit. You'll get much more control than with a power drill.
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Ocracoke
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Re: Antescher Assault Systems build diary

Post by Ocracoke » Sun Jun 10, 2018 10:46 pm

Looking good there, neater than my Ants at any rate :P
it always seems to go wrong. think i need to get some kind of pillar drill.
I picked up a pillar drill that uses a standard corded drill and simply guides it down for about £20. I need to get a clamp to hold the pieces down whilst operating the drill and the pillar arm but it definitely helps with drilling straight down.
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voorsk
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Re: Antescher Assault Systems build diary

Post by voorsk » Mon Jun 11, 2018 11:20 am

haha - thanks. You're definitely far too kind. :)

Thanks for the advice - I'd forgotten about egg beater drills! Definitely need one of those. I bought a hand drill from Aldi over the weekend, which made things a lot better, but it can only cope with bits up to 2.5mm (I've ordered a better one). Good for drilling pilot holes, but that was a late realisation after a few failed attempts. I'd made a lot of those before buying that drill, so the bot is a lot shonkier than it looks!

Another thing is that the bot was originally supposed to be a plain box shape, but I wanted to see if I could make it out of two U-shaped bits of 1.5mm polycarb. The answer is no; I couldn't get it to bend much further than 45 degrees. :P I was going to scrap the plastic, but had the idea of bending it again, and it's definitely better looking than a box! I couldn't remember where I'd bent it, though, so the bottom and sides don't fit together very well, and the change in shape meant a lot of hole placements had to change, and internals moved about.

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DieGracefullyRobotics
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Re: Antescher Assault Systems build diary

Post by DieGracefullyRobotics » Mon Jun 11, 2018 2:12 pm

It definitely doesn't look as bad as you seem to think it does! Looking forward to seeing it go.
Dave
Die Gracefully Robotics - Barely Even a Proper Team.

voorsk
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Re: Antescher Assault Systems build diary

Post by voorsk » Tue Jun 12, 2018 8:53 am

Must be my l33t photography skillz! :D

I admit that stuff isn't too far off, but it's enough to make it undrivable. The motor mounts were the first things I drilled, so the motors don't line up, and one motor sits higher than the other because the chassis is bent due to the spacer holes not being lined up. :roll:

Speaking of bending, I turned my attention to Fermented Melon last night. I'd been putting it off because I suspected I needed more practice before attaching the curved rear section, and I reckon I was sort of right - if I'd tried it with the dremel it would've been a mess. Lots of sellotape and some hand drilling later, and this is how it looks:

Image

The curved polycarb is under quite a bit of tension at the moment, so a breath from a passing sparrow will probably cause it to explode catastrophically. I might have a go at worrying it into a more permanent curl tonight. Weirdly, the motors are quite well lined up, considering I drilled them before I started on Suspicious Houmous. Not sure how I managed that!

It's gonna be a front flipper, I think. The parts seem to fit, but it's tight, and I'm not sure how much of a flip it'll have. It may turn out to be just a wedge with a big flappy srimech, but at least it'll be melon-shaped, and that's the important thing. :)

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