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Messages - MarkHarrison

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Event Results / Re: Motorama Robot Conflict 2019
« on: March 01, 2019, 04:46:53 pm »
Missing one of my fights - Ratfish, Angry Accountant in the winners bracket finals for antweights.

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For a first pneumatic bot, I would get a working mock up of all the parts and plumbing before doing too much design work. I had a lot of re-work and wasted parts on my first pneumatic bot because things didn't work out in real life they way I thought they would on paper.


Also, 1/4" ports are going to be real slow for a 30. I would go with at least 3/8" - preferably 1/2".

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Yes. those are the 30A escs I referred to. The Tinymixer is what I use in my 30. There are people who use them in heavyweights. They should be sufficient.

Turnigy batteries from Hobbyking are a good deal as far as batteries go. Something in the 2000 mah range should serve you well.

That Ebay esc is almost certainly crap. I've tried similar esc's, and generally they have no braking, reverse is less than half speed, and the rating are greatly inflated.

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Progress Reports / Re: Team Brain Damage
« on: July 11, 2017, 08:31:25 pm »
Damn Zac, that sucks. I was really looking forward to seeing this thing in action. I'm in a similar boat myself, having spent several weekends hand winding my own solenoids, trying to get something at least marginally adequate for Dynamo, but it just isn't happening.

Even if you can't get it working for the event, the concept you have is super intriguing, and I really hope you come up with a solution that allows you to pursue it some more in the future.

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Harbor Freight drills should give you adequate power for a weaponed 30 lb bot.  Both Kitbots and Team Tiki make wheel hub mounts for drill motors that work quite well. I would definitely suggest using one of these pre-made hubs rather than trying to rig up your own wheel mounting method.



As far as speed controls, the one you linked to is rated a bit under what you will need for a 30, and is definitely not adequate for combat. At a minimum you will need something in the 25A - 30A range. Two Botbitz 30A or 75A controllers with a Fingertech Tinymixer is the most common speed controller setup I've seen. Two of the 30A controllers and the mixer will run you about $100, and is probably the cheapest set-up you are going to be able to get away with. A little bit more expensive than that is the Scorpion XXL, which is what I used in my 30, before I switched to brushless.

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Progress Reports / Re: Team Anarchy Robotics
« on: February 22, 2017, 05:39:16 pm »
Did the UHMW wheels on Mega CC take any damage? Any thoughts on their effectiveness? Seems like Huge had a similar UHMW/bike tire pairing that seemed to work pretty well.

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Progress Reports / Re: Team Ambient Chaos
« on: October 21, 2016, 10:55:21 pm »
Clip the middle wire on the weapon esc, not the ground wire. You want to have signal and ground only on the weapon ESC. Dual voltages will definitely do funky things if they are crossing paths in the receiver.

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Progress Reports / Re: Team AstroBot
« on: July 14, 2016, 09:29:53 pm »
what about this motor.  anyone tried it?

https://www.botkits.com/collections/all-products/products/22mm-dc-gear-motor

i want to try it myself but its 3x the cost of the noisy kitbot motor yall talking bout

They work well. Very similar to the kitbot motor. They all have issues with noise though. Mine work fine on my Futaba, Frsky, and Team Associated radios, but glitch like hell on my Spektrum and Orange radios.

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Event Results / Re: NERC Franklin Institute 2015 fight results
« on: October 26, 2015, 08:37:05 pm »
I think it's Glasgow Kiss, not Glasrow Kiss

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Progress Reports / Re: Team Brain Damage
« on: October 26, 2015, 08:31:40 pm »
Hey Zac, nice meeting you at Franklin. I appreciate talking to you, and all the advice you gave me regarding my spinner motor issues. Hopefully I will have something a bit more competitive at Motorama, and last a bit longer than 10 seconds against Triggo  ;D.

I'm curious to see your conclusions from the high speed filming. Did you have something specifically you were looking at, or just trying to gather information in general?

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Progress Reports / Re: First Beetleweight
« on: September 03, 2015, 07:31:31 pm »
Are your receiver trims set to zero and have you calibrated your speed controller to your receiver? If you've already done that, my next step would be to test it without the mixer and see what happens.

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Questions / Re: Looking for powerful beetleweight motors
« on: August 03, 2015, 07:23:30 pm »
The Scorpion has a really nice mixing and throttle curve algorithm built in. I can't speak to their battle worthiness yet, but I've done a ton of hard testing on them and they've held up well, and control better than any radio mixing or standalone mixer I've ever used.

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How thick can you go with UHMW? I have a bunch of 1/2" - 3/4 UHMW pieces that I am looking into getting done. Taper wouldn't really be a problem.

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Progress Reports / Re: Last Minute Robotics - Adrian Kelly
« on: July 26, 2015, 07:31:00 pm »
Looking forward to seeing Mad Props in action. I love the concept you've come up with.

By the way, your post on Facebook inspired me to start designing that powered cement trowel type bot I'd been thinking about for years. It's looks like it's going to be a beetleweight. Is Mad Props going to be an ant or beetle?

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Are there any major differences aside from the ridiculously generous NERC walker/shuffler bonus?

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