June 23, 2018, 07:49:50 pm
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Questions / Drive Power Shutting Off
« Last post by Kevin Colgan on June 20, 2018, 10:17:58 pm »
Hello! I have a problem with my drive system. I have 2 30000 rpm dc brushed motors[/url][/url] attached to 38:1 BaneBots gearboxes. These are run by 2 DMC 60 controllers from Diligent, and powered by 1 14.8v Lithium Ion battery pack. When acceleration too quickly the power shuts off, and I cannot figure out why. When I attach the motors directly to the battery, it starts to move but stops (I am using XT60 connectors), but when I attach the motor to the battery using alligator cables it works flawlessly. Of course it moves slower with the alligator cables. I have also noticed that the brushed motors spark when switching directions. I am not the most familiar with motors, but I do believe that sparking should not occur. If you have any suggestions on how to fix this then please let me know.
Thanks in advance,
Kevin Colgan
Progress Reports / Re: Beetleweight Build Log
« Last post by rcjunky on June 17, 2018, 11:56:00 pm »
Just 2 silver sparks? I think you'll find they lack the power and durability needed to drive a 3lb bot with just 2. That weapon motor might struggle as well unless you have a lot of reduction to reduce the rpm of the drum. I suspect that size of battery won't be enough for 3mins, but with that much weapon it's unlikely any/many fights will go the full length.
Event Results / Botrank Updates on Hold Temporarily
« Last post by MikeNCR on June 12, 2018, 12:12:35 pm »
Transitioning management of many aspects of SPARC, updates to Botrank will resume after completion of the process.

As a general reminder, examples of the correct format for results can be found at: http://www.botrank.com/format/
Progress Reports / Beetleweight Build Log
« Last post by jDaw1 on June 11, 2018, 02:58:53 pm »
About a month ago, I started designing a beetleweight with a abnormally large drum. I wanted to share what I have so far.

The whole thing weighs 2.681 lbs in CAD, and the drum alone weighs 1.193 lbs. I haven't included the weight of the ESCs, but I should be fine (maybe). The chassis will be milled from a solid 12x6x1.5" block of UHMW. I kind of stole the idea from Robert Cowan and his antweight Sargent Cuddles.

I'll be using the 22:1 FingerTech motors with the TinyESCs. The drum will be driven with the FingerTech inrunner motor and a Turnigy Plush 25A. The whole system will run off a Zippy Compact 3S 850 maH Lipo.

If you have any tips/suggestions, I would be glad to hear them!
Progress Reports / Re: Mutually Assured Destruction
« Last post by Infernaltank on June 09, 2018, 10:02:53 pm »
I'm rebuilding Slim Pickens for Bot Blast

Unibody UHMW frame, 2mm wedge. Surprisingly underweight too.

Thunder Child is getting some modifications for fighting D2 kits, but I'm keeping them secret until I get them done.
Progress Reports / Re: Team Ignition
« Last post by zacodonnell on June 08, 2018, 11:38:49 pm »
I find that every time I make a shell I wish the teeth were longer against the shell than the last time. On the last version of Triggo and Tetanus before that they stuck out 1 inch and were 2.5 inches along the shell. Triggo had serious bracing on the inside of the shell right where the teeth attached, but they still dented in from huge vertical hits. Anything less than 2:1 I think is asking for shell buckling, especially without some more internal bracing.

I look forward to seeing how your design holds up. I like the tilted back shape for the vertical spinners. I tried to do something similar and I think it helped a lot. The best bet against horizontal spinners is making it so the teeth mesh (traveling the same direction as the other bot's weapon). The design you have can only work one direction, so I think that is a big detriment.

Progress Reports / Re: Team Ignition
« Last post by Badnik96 on June 07, 2018, 04:52:19 pm »
Been a while, hasn't it :P

Motorama went insanely well, with one-day build Sparkplug winning fairies (despite some tough competition), FireArrow ending up 4th in ants, and Nitro Hornet ending in the top 12 of the beetleweights, all great results. Now it's time to get things ready for Bot Blast. First things first, Spinjitsu is getting a new shell with a new tooth design:

This shape should hopefully hold up to vertical and horizontal spinners better, and help keep the shell from warping as quickly.

I've also finished up the CAD of my new 6lber Salamandra, a Sawblaze expy using a lot of the parts from Landshark:

Main improvements from landshark will be the higher-voltage motors, which I hope will keep the current motors from dying mid-fight like they seemed prone to last year. Right now the arm is being actuated by a 99:1 Pololu 25mm gearmotor (basically a higher-torque variant of the kitbots beetle motors) and the saw itself is being powered by a small turnigy brushless I had floating around for another project that I never started. the saw model right now is a placeholder, I don't have any actual saws picked out yet.
Progress Reports / Re: Team haciM
« Last post by Team haciM on May 27, 2018, 03:27:59 pm »
I am looking fowrard to it!
Progress Reports / Re: Team haciM
« Last post by satacoy on May 27, 2018, 01:28:30 pm »
Glad to hear you're going to make it out to Colorado, Micah!  Looking forward to seeing the new and improved Beam.

Pete - Team Cosmos
Progress Reports / Re: Team haciM
« Last post by Team haciM on May 27, 2018, 12:46:17 pm »
Alright time to get busy. I registered for avc in september and am in the process of buying a house that currently has no garage. So now I have got to get all of my milling done before it goes into storage. I got all of the side pieces milled to height. The front plates are also going to be the motor mounts. This will save some weight and make replacing motors much faster. I am making doubles of everything in anticipation for motorama as well because I probably won't have much spare time come the end of June.
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