Team BLEEP build diary

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voorsk
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Re: Team BLEEP build diary

Post by voorsk » Mon Mar 25, 2019 12:48 pm

I was already using just the one hinge. The nylon ones were too flimsy, so I just added it as a fixed wedge in the end. Weight: 144g.

Botfest was the other day, and it's a good event for testing or dialing in robots, as you get a lot of fights. I needed the testing, as I hadn't test driven either robot properly. There are no flat surfaces big enough in my house, so all i'd been able to do is test that they drive in the direction that I was hoping they'd go in. I need to build my own arena! :P

As my memory is so bad, I'm afraid I can't remember exactly who I had fights with. Some of my fights were over so quickly that I'm not even sure if I had a fight. That brings me to my first bot; Sprouting Potato!

Image

So, the wedge worked well, even tho I'd forgotten to bring acetate. The same cannot be said for the drive system. It's using 1000rpm 20:1 motors with 32mm Pololu wheels, because I'd superglued them to the motors for an AWS rush job. :roll: That gives it a top speed of about 3.75 mph, which doesn't sound like a lot, except that it's 66 inches per second, so it can get from one side of the arena to the pit in half a second. Can you guess what happened a lot? :P

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With a bit of tweaking to the TX, and some practise, I got it handling in an almost manageable manner. I think I even won a couple of fights! ooh, and I got to test the wedge against paulmchurd's spinner, which was fun. It survived! So did he, of course, and I spent the rest of the fight badly driving and exposing my rear to him. Scary! :D

And then there was Fermented Melon! I was starting to think that I might drop fermented melon and do something else, but after the fights it had, I think I'm gonna keep it. It was fun!

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So, that axe.. I remembered to fire it a lot more this time around, and I found that it likes to get stuck into wood. Arena floor wood. A lot. :roll: It seemed to get better and better at attaching itself to the arena floor as the fights went on. I don't think it caused anyone any actual damage, and it was more use as a self righter and as a grabber, which was kind've intentional. It's more for fun than damage dealing. :)

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It had a couple of longish fights when I managed to curb my lemming-like tendency to drive into the pit, and even managed to go to the judges against the eventual winner, Bodacious. I lost because I got stuck in the arena so much. :P I also fought the other axebot in the competition (think it was called 'axe on, axe off') and won, which I certainly wasn't expecting! ooh, and I fought another spinner, which hit one of the long bolts on the front of the wedge and produced a lovely spark. I didn't try feeding the axe to it, as I didn't want to have to clean up bits of broken blade from the arena.

All in all, I was quite happy with my bots. Well.. not Sprouting Potato, exactly. I was just happy it worked, and wasn't a complete embarrasment. It was kinda cool, in a way. It was a great event, and many kudoses to Ocracoke for organizing it. I'm glad it's still small and a little bit amateurish, as it's way more relaxed than AWS or Antfreeze, and you never know who might win.

Here's a vid of the axe versus some 1mm polycarb, and then what happens when it hits wood when it misses:
https://youtu.be/dctTCEMmjGA
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

Paulmchurd
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Re: Team BLEEP build diary

Post by Paulmchurd » Mon Mar 25, 2019 1:56 pm

I had a pretty fun battle vs Melon. Either your bot or the other axe bot got inside flipit and half cut the power cable which then kept shorting out the receiver. I’ve resoldered the entire robot to fix the problem. So someone’s axe worked!!!!

Kyro
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Re: Team BLEEP build diary

Post by Kyro » Mon Mar 25, 2019 6:04 pm

you can save weight on sprouting potato by switching the side guards to 1mm, and also replacing the motor mounts with some cable ties... you should be able to save enough weight to get that flipper back...

also setting rates in your tx can get the speed down to be more manageable... a lot of fiddling to get it right though...

and maybe an axe stopper which catches the axe shaft leaving 1-2mm clearance between the head and the floor... something rubbery would work best... maybe a dollop of silicone sealant in a well placed spot might work...

otherwise, glad you had fun and had a chance to fight, from experience i know that messing about with your bots and actual fights are so different... its good to get the experience and to see what improvements you can make to your bot and your driving skills...

im sad i missed the event but i wait for the inevitable youtube video
Team Rocket Robotics
Esper(4wd flipper)
Mantis (4wd grab 'n' lift)
Dominus (SPINNAAAAAH under construction)
Remembering Rex (antweight cassuis)

I got in touch with my inner self today....... Thats the last time i buy cheap toilet paper!!

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voorsk
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Re: Team BLEEP build diary

Post by voorsk » Mon Mar 25, 2019 9:17 pm

ooh - actual damage? :D that was probably the other axebot, then. :P
i did enjoy ramming stolen concept right in the gubbins with sprouting potato. even though it didn't achieve much, i think it was my favourite moment, as i just really wanted to ram a spinner to see what happens. :)

the side armour on sprouting potato is only 1mm. same goes for the bottom armour. the top is 2mm for rigidity. there are quite a lot of ways of saving weight, but they meant either re-cutting the armour, which i didn't have time for, or ordering more bits, which i didn't have time for either. potential weight savers are the aforementioned cable ties, nylon standoffs, holes in the 2mm polycarb, attaching the wedge to the side panels instead of the top, cable tie hinges (with polycarb insert to stop it getting stuck), a non-steel wedge, and probably other things besides. i never know until i try, and basic hinges were first in line due to easiness.

having said all that, it's irrelevant, coz my next learning experience is gonna be gear-driven 4wd and caterpillar tracks (one of each). halving the amount of motors should save a bit of weight. :) this may have been sprouting potatoes last fight.

as for the melon, it's armour was the weapon stop (it's only polycarb on polycarb). i just didn't think it would get so stuck into the arena! I'm not sure if I'm gonna keep the axe, or swap it for a proper grabber. the grabber would work better, but axes are just cooler. hmm...
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

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voorsk
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Re: Team BLEEP build diary

Post by voorsk » Thu Jun 13, 2019 3:35 pm

progress report: naff all!

So, I thought I had lots of time to plan the next bot. I made a 4-bar flipper design that rocks, and I intended to field it for AWS 58, but I felt like a rest, so didn't build it straight away...

Then my wife got a job in Leeds, and so we need to move house before September, and now we're trying to make our house look presentable to buyers (cover up damp, repaint everything, refit kitchen, sift through the endless mess of two hoarders and a Lego-rich kid). No time for bots! :-?

But, the old bots still exist, and just need a few tweaks. Fermented Melon hasn't even had it's batteries removed since BotFest 2, which probably isn't a great idea. I need to literally cut a few corners and make FM fit inside the 4" cube. I might even try and find a weapon that doesn't just attach to the floor all the time. The weapon motor got dirt in it, and jams a lot. I'm hoping I can just clean it to fix it. Sprouting Potato is in bits, but the electronics are still wired together. Now that it's free of the big wheels, I can make them a bit smaller, and hopefully make the whole bot a lot more low profile and a smidgen more controllable.

I think I can fix them up in time for AWS 58. I just need to convince the wife to let me take a break from tiling for a day. How hard can that be? :roll:
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

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voorsk
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Re: Team BLEEP build diary

Post by voorsk » Fri Aug 23, 2019 11:26 am

I still haven't moved house.
Most of my robot stuff is in storage.
But I kept some back!

I kept my parts box, a few bits of polycarb, and my only completed bots; Sprouting Potato and Fermented Melon. No way of soldering properly, so I have to use the same electronics.

Fermented Melons electronics were okay. The weapon motor is a bit jammed, but hopefully I can clean that out. I just need to redo the armour and shorten the axe so that it fits into the 4" cube.

Sprouting Potato was waaaaaay too fast, fanx to its 20:1 motors. I can't change the motors, so I've changed the wheels. It's now sporting some 3D printed wheels that didn't fit properly when I first tried them during the last build. A needle file has sorted them out!

Image

Reducing the wheel size meant using cable ties instead of brackets to hold the motors in place. I haven't quite sussed that bit out yet, as they wobble about a bit too much. I'm gonna try using polycarb offcuts to wedge them in. I also reduced the armour thickness, as it was only thick for stiffness, and I don't think that's necessary. In fact, I think it made things worse.

Somehow, there is now enough room for a servo, so I'm pondering the best shape of flipper to use, and how to mount it. I'm trying to keep it invertible, which is making it tricky.

In other news, my plan to make an FPV crawler has mutated into me spending too much money on a pair of FPV drones. I have a feeling that hobby is going to become an extreme wallet drain! :roll:
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

Kyro
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Re: Team BLEEP build diary

Post by Kyro » Fri Aug 23, 2019 12:09 pm

depending on your transmitter, you can slow the speed of the motors down further... im guessing (by the rx) that you use a afhds2a compatible tx so maybe a flysky fs-i6?
i know you can use rates to slow things down, but im not entirely sure how to advise for that other than just playing around and seeing what you end up with, however, i do my own mixing (even with esc's with built in mixing) and that way its as simple as setting the percentage of each channel which corresponds to the speed of both drive and steering...

as for the motors moving, pull cable ties as tight as you possibly can (use pliers) then, when you have finished building it you can use that little bit of wiggle to get all 4 wheels in contact with the ground and set them there with a little bead of hot glue... just be sure to stay well away from the gearboxes.

hope this helps

Luke
Team Rocket Robotics
Esper(4wd flipper)
Mantis (4wd grab 'n' lift)
Dominus (SPINNAAAAAH under construction)
Remembering Rex (antweight cassuis)

I got in touch with my inner self today....... Thats the last time i buy cheap toilet paper!!

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voorsk
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Re: Team BLEEP build diary

Post by voorsk » Fri Aug 23, 2019 12:51 pm

Yup - tis an i6 alright. I've adjusted the sticks a bit since last time, and I've already adjusted the rates. I intended to add resistors for a bit of braking, but that'll have to wait. The main thing will be practise, I think. I never managed that in its previous incarnations. I need to run a gauntlet with it! :D

Hot glue... I hadn't thought of that! I was planning to use some silicon grip thingies, but i think they're too squishy. I might try glue if nothing else works (I don't like things to be too permanent, in case I mess up the shell due to indecision)
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

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MarkR
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Re: Team BLEEP build diary

Post by MarkR » Fri Aug 23, 2019 9:37 pm

I'm using 20:1 motors and my robots are a bit fast but still work. I did some adjustment in the firmware and got the speed about right.
Robot: Betsie - RaspberryPi controlled flipper bot with gyro stablisation - too clever for her own good?

Kyro
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Re: Team BLEEP build diary

Post by Kyro » Sat Aug 24, 2019 12:10 am

hot glue is never permanent ;)
Team Rocket Robotics
Esper(4wd flipper)
Mantis (4wd grab 'n' lift)
Dominus (SPINNAAAAAH under construction)
Remembering Rex (antweight cassuis)

I got in touch with my inner self today....... Thats the last time i buy cheap toilet paper!!

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voorsk
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Re: Team BLEEP build diary

Post by voorsk » Mon Sep 02, 2019 9:57 am

Before I post this, I'm sticking my fingers in my ears.. er... eyes? I'm not listening to advice! I like to make my own mistakes. :)

With that in mind, here's a new project that's wrong on soooo many levels; Curious Custard!
Image

It's an antweight thwackbot! :D
Image

As if antweight thwackbots weren't underpowered enough, this attempt is using 100:1 motors, and is more like a patbot. I thought 50:1s would be too fast with the big wheels, but I think I went too far. It might improve with a bit of weight on the axe (50g left) - I haven't decided what that'll be, yet. :roll:

oh yeah, and the balance is all wrong. As far as I know, there's supposed to be a bit of counter-balance to the hammer, but the weight's all over the place. I have ideas, though. This is just the first attempt; the prototype, if you will, which is certainly providing a learning experience! I'm hoping to get it finished for BotFest 3. :D
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

Kyro
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Re: Team BLEEP build diary

Post by Kyro » Mon Sep 02, 2019 11:55 am

pat bot you say?

this is a perfect opportunity to have a little hand as the weapon so you can slap other bots... :)
Team Rocket Robotics
Esper(4wd flipper)
Mantis (4wd grab 'n' lift)
Dominus (SPINNAAAAAH under construction)
Remembering Rex (antweight cassuis)

I got in touch with my inner self today....... Thats the last time i buy cheap toilet paper!!

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MarkR
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Location: Reading Hackspace
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Re: Team BLEEP build diary

Post by MarkR » Mon Sep 02, 2019 11:58 am

Nice wheels / tyres. Where did you get them/ make them?
Robot: Betsie - RaspberryPi controlled flipper bot with gyro stablisation - too clever for her own good?

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voorsk
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Re: Team BLEEP build diary

Post by voorsk » Mon Sep 02, 2019 12:22 pm

Kyro wrote:
Mon Sep 02, 2019 11:55 am
pat bot you say?

this is a perfect opportunity to have a little hand as the weapon so you can slap other bots... :)
*unplugs eyes* YES! :D

I got the wheels here: https://shop.pimoroni.com/products/moon ... heels-pair
Plus, someone linked a narrower variant earlier in the thread: https://www.aliexpress.com/item/32594453305.html

edit: just had a brainwave! My main issue was battery placement, and I had a feeling that I was thinking two dimensionally. I was right! Mounting the weapon shaft 'vertically' solves all my problems. revision 2 should be done tonight, with faster motors, a steel weapon shaft, and proper balancing. :D
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

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voorsk
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Re: Team BLEEP build diary

Post by voorsk » Wed Sep 04, 2019 10:45 am

Better, but still not quite right...
Image

It's now using 50:1 motors, and has the axe shaft mounted vertically. The shaft is threaded M3, so I can add almost anything as a bludgeon.

I thought polycarb might crack after repeated hits with the axe, so I made the base out of aluminium. It's cheap stuff, tho, and quite heavy, so the bot still weighs 100g without armour or an axe head. :-? I'm gonna go back to polycarb and see how it goes. I doubt it has enough power to break itself. :P

edit (I always feel bad about posting loads when the board's quiet):
The polycarb made it 4g lighter. Hardly worth it. I arranged the components into a vaguely usable state, and gave the bot a try.

Image

It seems to have an issue with one of the wheels not working, which is intermittent. When it works, it's too fast and really uncontrollable. It tends to try to flip itself over rather than turn, which is.. fun? :o

Image

A fun bot is no fun if it only lasts seconds and causes no-contact restarts, so I'm gonna switch back to the 100:1 motors. Also, Fermented Melon now has it's new 3-way ESC. It felt like that bit in Red Dwarf when Legion swaps out the internals of Rimmers light bee for the hard light thingie. :P
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

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