T_Y's Build Log

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MichaelG92
Posts: 39
Joined: Sat Apr 14, 2018 8:10 am
Location: Surrey

Re: T_Y's Build Log

Post by MichaelG92 » Fri Jun 22, 2018 8:00 pm

Regardless of the wiring, the outer shell of your robot is amazing! If I can get mine to look that neat I'll be extremely pleased! I look forward to seeing it in action next week.
Michael - Team MG Robotics

Fledgling Surrey based roboteering team

T_Y
Posts: 65
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Thu Jun 28, 2018 7:23 pm

So, quick update before AWS55.

I was planning on posting a video of Hello, World! working as intended, but I've already found a few flaws that will need to be addressed in the future. The first is that given enough stress, some of the screws will strip the holes in the 3D printed parts and come loose. The second is that the weapon motor can strip the hole in the actuator arm, causing it to no longer be able to flip anything due to lack of grip!

Luckily both of these can be temporarily addressed by printing off more components. So right now my printer is running overtime to get enough spares printed before I leave for Rugby tomorrow! Looking forward to taking part in my first ever event!
Thomas
Antweights:
Percussive Maintenance 2 - ''axe'bot (designing)
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

T_Y
Posts: 65
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Sat Jun 30, 2018 10:11 pm

So that was an amazing day, despite not winning anything! It was great meeting everyone and seeing their bots.

Hello, World!'s first fight was against Bzwroink and immediately got punted out of the arena! It's wedge was lower than mine and I got piggy-backed out. The second fight was against Spin-a-ma-thang (or was it thing, or thong?) - a horizontal spinner. I took a few hits to the front and lost the srimech when it rode up the wedge, but I think the impact jostled the internals a bit, so the switch half-flicked itself off- it was fine when I took it out of the arena. So the improvements to be made here are a more sturdy srimech and bolt/velcro down the switch.

Percussive Maintenance, on the other hand, needs a major revision (which I was already planning on before the event). It first went up against Anticyclone and managed to last for a while before being turned over. PM also lost it's second fight to being overturned against Harley's Hurling Horror. So the main thing the revision will aim to do is allow PM to self-right- that means a much stronger axe motor (how does 1200RPM @12V sound...). Im planning on taking the design for HW and make it taller to accommodate the axe mechanism. I plan on mounting the pivot point higher up on the bot, and I'm going to add some wings to the back to tip it over onto the flat top to hopefully self-right.

Let's see if I can get the redesigns finished for Robodojo mid July...

(edit:spelling)
Thomas
Antweights:
Percussive Maintenance 2 - ''axe'bot (designing)
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

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peterwaller
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Re: T_Y's Build Log

Post by peterwaller » Sun Jul 01, 2018 8:23 am

The faster the output speed is good for the axe but has lower torque so you would be better of with a relatively slow one for self righting.

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MarkR
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Re: T_Y's Build Log

Post by MarkR » Sun Jul 01, 2018 2:10 pm

You have some very nice engineering in those robots. I am thoroughly impressed.

I suspect the poor result was being drawn against strong opponents. It seems that all of team Oink are strong pushers and have great drivers.
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: T_Y's Build Log

Post by voorsk » Sun Jul 01, 2018 6:48 pm

was it tough having to fight two in a row? I'm not sure my nerves would've been up to that. :P
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

T_Y
Posts: 65
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Sun Jul 01, 2018 7:36 pm

@peterwaller
Ah right, that makes sense. I wonder what a good RPM/gear ratio is for a good balance between self-righting and axe power. I've got a few 600RPM@12V motors lying around.

@MarkR
Thanks! Though personally I think there's still some problems. On Hello, World!, I had to quickly solder on some extra wire in the morning when I got there as one of the board connections had come off during transit! The wheels are also mounted ever so slightly off from each other (one is 1-2mm forward of the other) - though that doesn't seem to affect driving.

Driving is definitely something I need to improve, I'm still not used to how twitchy the bots are!

@voorsk
It surprised me at first when I heard Percussive Maintenance get called up right after Hello, World!, I guess that's just how the random draw chose it to be!
Thomas
Antweights:
Percussive Maintenance 2 - ''axe'bot (designing)
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

T_Y
Posts: 65
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Sun Jul 15, 2018 5:31 pm

So I've just got back from Robodojo which was great fun! It was awesome seeing some beetleweights go at each other as well as the antweight fights.

I only took Hello, World! along as Percussive Maintenance still needs redesigning. It's been a good learning experience and practice at driving.

The first fight was a rumble against High Density Wedge Bot and the ant version of Smash. I went straight for Smash, taking some damage.

Image

Image

What had happened was the 3D prints failed, which caused the flipper to pop out. HDWB took Smash into the pit and then Hello, World! Well, I brought along spare brackets, so just replace them and then I'm back in.

The second fight was another rumble against Smash and Anticlockwise 2, a pretty powerful vertical spinner. Pretty much the same thing happened here, the 3D prints broke and de-laminated, resulting in this:

Image

Aaaand now I'm out of spare brackets, I didn't print enough! So now I'm reduced to being a wedge bot held together with copious amounts of electrical tape!

Image

Next up was a 1v1 against Anticlockwise 2. The fight could have been over very quickly as I got overturned (and no long having my flipper, no srimech), but Anticlockwise flipped me back over. I still lost, though there were a few close calls where I nearly managed to push Anticlockwise out of the arena.

Rebuild again with the electrical tape wedge of dooooommm (now with added superglue!) for the final main fight with the ant version of Crackers. This was a good, long fight, and eventually I spun out into the pit (I need to sort out the reverse listing to one side!).

The damage looked quite bad, but really, it's just the shell, all the electronics still work fine so its not that much effort to replace/improve the shell.

We also had a balloon popping game where everyone attached a pin and a balloon to their bot and we all went into the beetleweight arena to see who could keep their balloon the longest - that was a nice addition to the day's events.

The takeaway from this is that I need to strengthen the 3D prints in Hello, World!, and probably Percussive Maintenance aswell. I was only printing with 20% infill density, to save weight, but obviously that has comprimised the integrity of the brackets. I need to also redesign the hinge on Hello, World! so that it is stronger. Good job I've got plenty of time to the next event!
Thomas
Antweights:
Percussive Maintenance 2 - ''axe'bot (designing)
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

Matt
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Joined: Sun Jul 01, 2018 6:18 am

Re: T_Y's Build Log

Post by Matt » Sun Jul 15, 2018 8:33 pm

Well done on your tape repairs. I think you were always fixing something. Thanks for competing in the balloon game, but the two wins came as we had some acetite inside the straw, so it was held up. I certainly had fun, and had advice on the undercutter, which should be ready for aws 56.

T_Y
Posts: 65
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Wed Aug 22, 2018 5:38 pm

It's been a while since the last update. Gonna lay out my plans to prepare for AWS 56.

So, first things first, I still haven't repaired Hello, World! since Robodojo, so that's the first task. I'm happy with the deign, it just needs stronger brackets. So I'm gonna up the fill percentage and make them a bit bigger. If I can set up my 3D printer space to work with ABS that would also be a big help (need to design an enclosure for it).

Percussive Maintenance also needs a redesign. I'm planning on raising the pivot point of the spanner and driving it with a gear. Flattening the top should also make it easier to self right.

Image

I've also been toying with an idea for a four bar lifter, along the design of Lucky or Bronco over in the US. It's not a design I've seen in UK antweights, so why not try it out. I'm tentatively naming this bot 'Have You Tried Turning It Off and On Again?'. Here is a sneak peek of the CAD work:

Image

I think I'll prioritise Hello, World!'s repairs first, as there's not much work that I need to do to get it combat ready again. Not sure which one of the other two I'll work on after that...
Thomas
Antweights:
Percussive Maintenance 2 - ''axe'bot (designing)
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

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voorsk
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Re: T_Y's Build Log

Post by voorsk » Wed Aug 22, 2018 7:33 pm

sounds pretty cool! Hope it's not suddenly gonna become a theme, as I'm making a Lucky (not a bronco - i prefer Lucky's lifter motion) :D

there's a few ways of doing the mechanism, and mine is on caterpillar tracks, so hopefully they won't be too similar. Mine's called Black Carrot, in keeping with my gone-off-food naming convention (altho it makes me think of pirates)

oh, and I'm making a hammer bot after failing to make a front flipper.. I'm not copying you, honest!
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

T_Y
Posts: 65
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Fri Aug 24, 2018 7:00 pm

@voorsk
I'm going for 4WD, I've got a NanoTwo that will do nicely in that bot. I need to work out the specifics of the mechanism for the lifting arm first! Hammer/axebots are good! Like 4 bar lifters and front hinged flippers, they're not too common in antweights.

I've drawn up the brackets for Percussive Maintenance V2 in sketchup now, so it's time to print off those (and the parts for Hello, World!) and put together the prototype. Good thing I've got a long weekend with bank holiday monday!
Thomas
Antweights:
Percussive Maintenance 2 - ''axe'bot (designing)
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

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MarkR
Posts: 190
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Re: T_Y's Build Log

Post by MarkR » Fri Aug 24, 2018 11:42 pm

Will you do 4wd with 2 motors or 4?

If you use 4 motors, it's much more difficult to make weight. It is of course, still possible, but there will be less room for other stuff (like armour).

I am having fun trying to design a 4wd 2x motor... dunno if it will ever make it off the drawing board.
Robot: Betsie - RaspberryPi controlled flipper bot with gyro stablisation - too clever for her own good?

T_Y
Posts: 65
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Sat Aug 25, 2018 8:38 am

I was thinking of doing 4 motors, but I haven't really thought it out yet - I'll have to do some calculations on weight and space before I finalise the design.
Thomas
Antweights:
Percussive Maintenance 2 - ''axe'bot (designing)
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

T_Y
Posts: 65
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Sun Sep 09, 2018 4:09 pm

Update time! So, Hello, World!'s chassis is coming along nicely. The brackets are now printed out with 90% infill compared to the previous 15%, so they should hopefully survive more than one hit from a spinner!

The redesign of Percussive Maintenance is going well. I've cut out all the polycarbonate panels and printed off the 3D parts, also at 90% infill. The bot is wider at the top so it should rest falt when upside down (weight distribution depending), and should allow for a bit more wiggle room inside for the electronics.

Image

Image

There's a bit that I've still yet to cut from the back, which will allow the spanner to lay horizontally when at rest.

I'm still surprised by the quality of the printer despite it being fairly cheap. The axe has been raised and is now powered via a gear from the motor, using a 3mm carbon fibre rod as the axle. Doing this means that the axe strikes from a higher position, it should be more effective (not that this weapon was supposed to be effective in the first place!). Hopefully, the replacement motor I'm using can let it self right this time!

Image

I'll also be switching the internals to use the same setup as in Hello, World!, which will save a lot of weight.

I should be able to finish off the rebuilds in time for next weekend, where I'll be able to work out the kinks at Robodojo.
Thomas
Antweights:
Percussive Maintenance 2 - ''axe'bot (designing)
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

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