T_Y's Build Log

All things antweight

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T_Y
Posts: 60
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Sat Dec 08, 2018 7:02 pm

So, Robodojo's Christmas social is coming up next week so I'm busy getting my bots ready! For now, here is Have You Tried Turning It Off And On Again, version 2:

Image

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There's a load of changes from the first version. The wheels have been hollowed out to cut weight, and the motor mounts have been integrated with the brackets to hold the back panel and the top and bottom. This also brings the wheels out so they protrude out the back, allowing me to drive off other bots' wedges.

The front end has been made a lot wedgier, so it can get under bots more easily. There seems to be an issue with the construction so the front wedge isn't actually flush with the sides, but it works well enough. I've somehow managed to cut 30g off the bot so now its only around 136g.

https://youtu.be/uB-XOSm9D2w

I also managed to fix up Percussive Maintenance v2 so it actually works now. And, it can self-right... sort of. On my desk, it sometimes fails to self right, but on other surfaces such as at Sheffield it seemed to work just fine, so I'm not too sure whats going on there.

Next step is to actually finish the new front hinge flipper! It turns out there's already a US antweight called Blue Screen of Death, so I'm thinking of changing the name to something else.
Thomas
Antweights:
Hello, World! - front hinged flipper (retired)
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 (building)

Matt
Posts: 37
Joined: Sun Jul 01, 2018 6:18 am

Re: T_Y's Build Log

Post by Matt » Sun Dec 09, 2018 3:57 pm

Don't worry about my robots- we can't make it.

T_Y
Posts: 60
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Sat Jan 19, 2019 2:27 pm

New year, new plans!

I'm planning on having my bots ready for BotFest 2. The front hinged flipper is now called "It's Not a Bug, It's a Feature!". I've ordered a fast servo to go into that (unfortunately, it looks like pink servos are short in supply).

"Have You Tried Turning It Off And On Again" is basically already ready for that, I just need to print a slightly modified lifter arm to close the small gap at the front of the bot - a spinner can get underneath the lid and strike the lifter arm instead of deflecting off the polycarb. The front linkage will also be modified, so when the lifter extends, the front of the bot will lift off the ground slightly so it doesn't get stranded on one of the screws at the front.

"Percussive Maintenance 2" will replace the older PM, using HYTTIOAOA as a basis. I'm planning on running a servo-based axe this time, exploiting gear ratios. Sheffield Roboteers Society recently showed a servo-based hammer bot which shows its definitely doable.
Thomas
Antweights:
Hello, World! - front hinged flipper (retired)
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 (building)

T_Y
Posts: 60
Joined: Thu Mar 15, 2018 12:51 am
Location: York

Re: T_Y's Build Log

Post by T_Y » Sat Feb 16, 2019 7:28 pm

Right! So, I've been working on getting INABIAF to fighting condition. I've printed off a servo harness to mount the servo to the base as the wings on the servo are not oriented correctly to let me screw through the base of the bot and into the screw holes. The harness sits around the servo and serves as the screw point.

This afternoon I've been soldering the wires and components together. The good news is nothing exploded! The bad news... drive doesn't seem to be working. Debugging the Arduino, it seems to be working fine, so I suspect it's something to do with the motor driver. I checked the motors by plugging it into the motors for HYTTIOAOA but that didn't work, so I don't think the motors are the problem. I have a spare copy of the motor driver from Hello, World! and Percussive Maintenance so I'll use that I guess, as I know it works (it's the same chipset, but different board manufacturer). Should get that done tomorrow and hopefully have it working.

At least the servo works. Unfortunately, it can't self right - the flipper doesn't quite extend far enough to tip the bot back over. But this is where those 'cat ears' you can see in the CAD come in. I've designed it so that these are separate components and are screwed in, so if they get damaged, I can swap them out. Or in this case, I can redesign them so that they are taller, and print off new versions to mount. This should solve the self righting issues.

Oh, and HYTTIOAOA has new lifter arms which bring the front plate flush with the sides now.
Thomas
Antweights:
Hello, World! - front hinged flipper (retired)
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 (building)

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