January 19, 2018, 02:35:39 pm
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Messages - zacodonnell

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Progress Reports / Re: Team Brain Damage
« on: January 18, 2018, 10:33:15 pm »
Today involved a little work on my house instead of my robot. It is all squared away now, and I managed to get the keyway cut on the new weapon motor too. The glue set nicely on the drive motors so I'll be pulling the old ones out and replacing them, as well as installing the new weapon motor this weekend. I did break an endmill but I had a spare (thankfully)



Progress Reports / Re: Team Brain Damage
« on: January 15, 2018, 10:10:08 pm »
Some slow progress this weekend. I decided to try to see if I could steel (heh) some weight out of the steel in the clutch. It turns out that I can't, without weakening it tremendously. Once I took the outer pulley ring completely off I got about 8.5 lbs on the scale (vs ~18 lbs on the raw pulley). My tests with the one in the bot (which is part way between them) is about 13 lbs on the scale for this test.

Tonight I spent some time hunting for weight reduction measures now that plan A failed. I found a couple, so I think it'll be ok. We'll see I guess. Since I have to redo the entire wiring harness to replace the drive motors and controllers I decided to just go for it and find the weight later. That's delaying the time to test a little bit, but will save time in the long run because I won't have to take it all apart



Progress Reports / Re: Mutually Assured Destruction
« on: January 15, 2018, 09:35:47 pm »
How mobile are you if the floor has seams or is made of wood? I had a lot of trouble keeping a heading when I was using a similar setup


Progress Reports / Re: Team Brain Damage
« on: January 14, 2018, 09:23:35 pm »
Only if the weight faires show up. I spent today cutting down and prepping an alternative clutch plate that didn't have the steel outer ring, and it provides a significantly reduced amount of torque at the clutch. Just another indication I don't really have a good sense of how the magnetic fields are set up / what is affecting the effectiveness of the clutch. I'm right up against it on the weight.

I do have one additional pin available on the octopus though, so it could happen.


Progress Reports / Re: Team Thrasher / Sunny Robotics
« on: January 14, 2018, 11:10:17 am »
Very cool. Has it fought any midcutters? The design is a little closer to the first undercutter I ever saw in person (http://www.lazytd.com/rc/rcg/hworf2.jpg) than the more common designs you see these days. Seemed nice and reliable in that video.


Progress Reports / Re: Twisted Sick Robotics
« on: January 14, 2018, 11:05:28 am »
I'm curious to see if they will provide the benefits in this geometry that you need. With the flipper I'm throwing a bunch of weight forward so the bot tries to kick pretty much exclusively backwards, but with the hammer head rotating around the interaction will be much more complex. I think it will help a lot to prevent the bot from kicking backwards, but I'm curious to see how much it will help to keep the front down.

I like the gratuitous weight utilization in the shield on the front :)


Progress Reports / Re: Twisted Sick Robotics
« on: January 14, 2018, 09:05:17 am »
I really like the counterweighted axe idea.  I see you borrowed my cleat idea for the outriggers on the back of the robot. I'm very curious to see how much kickback you get with this bot.


Progress Reports / Re: Team Brain Damage
« on: January 14, 2018, 09:00:23 am »
So... I missed the Motorama registration window. You people and your facebook... I'm going to have to get used to this whole "more competitors than we can handle" thing.  Fortunately, I was able to get in on the wait list, and even though Magneato doesn't appear on the BDB, it will be there unless I blow it up on the bench or in my test box. Triggo is dead, with a couple of huge dents in the shell from last year and a warped baseplate / smashed front axle. Rather than rebuild it and continue to cause box breaches when I fight Big Ripto, I'm focusing on the Sportsman for now. It's a hard thing to say, since I've never gone to Motorama without a shell spinner since 2004, but life... happens. 

With that, I've started making updates for Moto this year. At Franklin I had to "kick it old school" and run without an onboard microcontroller. That was pretty rough on the guts of the bot, and eventually having the robot try to spin the flywheel up the second the clutch was turned off (but not necessarily disengaged) was too much for the weapon motor. Kyle pointed out I should just switch the motor to an inrunner to avoid the silly grub screw / press fit problem but the better solution is to coordinate the throttle better using a microcontroller.

I pulled the old control board out, popped the Arduino Nano off of the socket I made, and installed a new one I got here:

I skipped the ICSP headers this time and used a real soldering iron and popped three of them out pretty quick. After some bench testing I put the real software on there and went to work on the new breakbeam sensors. I'm using these: https://www.adafruit.com/product/2168  The sensors are used to detect when the arm is past the useful point in time for me to disable the clutch. Still need to test it at speed but I'm hopeful it will save my rear bar, rope, and flywheel energy when I miss.

I still need to wrap up the wiring, replace the damaged weapon motor, and do some testing. Stay tuned



Progress Reports / Re: Twisted Sick Robotics
« on: January 10, 2018, 06:36:42 am »
Yeah, I can bring an arbor press this year.


Progress Reports / Re: Twisted Sick Robotics
« on: January 03, 2018, 08:31:47 pm »
You have me seriously worried about my top armor.  I've got a couple small updates to Magneato planned, but nothing that will be happy about anything in your drawing...


Progress Reports / Re: Team Brain Damage
« on: October 30, 2017, 06:13:52 am »
I only had Magneato at Franklin. It went about as well as I expected. At the last minute I had to pull out the microcontroller and run everything manually right off of the transmitter. This meant that after flipping the weapon motor didn't have any of the ramp-up time or built in pause to let the clutch disengage so it was pounding the motor pretty hard. In my third fight the shaft press fit / grub screws failed and in the fourth fight the hasty repair job gave up about half way through.  The rest of it worked decently well and many flips were had for a final 2-2 record.
Magneato vs Bot-a-rang

Magneato vs Dorno

Magneato vs True Grit (should have won, got stuck upside down at the end because of the motor)

Magneato vs Uberclocker

I also got to help kyle with Congo, the chair-swinging sportsman bot. He helped me keep Magneato working so I figured I'd pitch in as a guest driver. I forgot to hit record on one of the Congo fights, and on another one there was no videographer, just a tripod and my camera, so the footage is pretty weak.

Congo vs Uberclocker (note the extra chair in the arena for Uberclocker to use)

Congo vs Iron Golem (old fashioned slug fest)

As for motorama - I totally didn't realize the registration was already up. Life's been pretty busy lately and I just spaced out. I put a reminder on my calendar for round 2, so I'm still hoping I can get the sportsman in. Triggo is trashed after last year so I probably won't have a full combat 30. Thanks for the interest :)


Progress Reports / Re: Revelation Robotics
« on: October 06, 2017, 03:13:28 pm »
What you describe is very close to what I was going to recommend if using off the shelf parts. Hope to see it in action in person.


Progress Reports / Re: Team Brain Damage
« on: September 29, 2017, 10:42:04 pm »
It is .25 inch titanium. I was bending the .25 6061 aluminum angle I used on the much less powerful first version. It was formed by whyachi. A well braced .25 aluminum could work I think.


Progress Reports / Re: Team Brain Damage
« on: August 26, 2017, 10:02:34 am »
Got my tickets in the mail. Looking forward to the event.

I don't think I'll have time to do anything especially interesting this year, unfortunately. Spare time has just not been widely available lately. It's still going to be fun though!


Progress Reports / Re: Team Brain Damage
« on: August 18, 2017, 06:36:50 pm »
I'm in now. Thanks for the reminder!


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