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Messages - rcjunky

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136
Progress Reports / Re: Team Whanton 2
« on: November 06, 2016, 10:35:13 pm »
I'd be interested on seeing how well d2 works. The stuff is a nightmare to use and is very wear resistant, not certain about toughness though.

137
Questions / Re: Receiver power supply
« on: October 22, 2016, 10:02:33 pm »
That makes sense, the bec in the tinyesc is only enough for a receiver, if there's any draw it's not enough. If the weapon esc has a bec that should be enough without any issues.

138
Questions / Re: burning up brushless outrunners
« on: October 22, 2016, 09:59:20 pm »
How about we start with what motor, esc and weapon size/weight. If there's smoke out of the motor, it's toast. You can't really have too big of an ESC, the ESC will only give as much as the motor draws.

139
Questions / Re: Sharpening Weapon Screws
« on: October 22, 2016, 09:07:45 pm »
Files don't cut screws so good, dremel or angle grinder is good. To hold them I'd take a nut and cut a slit in it, screw in the screw and clamp it in a vise so the split nut clamps the screw without damaging it.

140
Questions / Re: Receiver power supply
« on: October 22, 2016, 09:02:45 pm »
Tinyesc are specifically made so you can run many of them without becoming issues. Unfortunately this is not part of your issue.

141
Questions / Re: Milling with a drill press
« on: October 11, 2016, 03:08:27 pm »
I'm sure you can, but don't really want to. They're not made for the side load. I also wouldn't trust the chuck to be super precise tbh. You may also not be able to the the right rpm range you need. If its just uhmw you're milling, clamping a cross slide vise to the table and using a center drilling 2 flute end mill to drill out a majority of the material and basically clean it up by milling it should be ok, but wouldn't do a ton of it for sure.

142
Questions / Re: DC brushed motor help
« on: September 26, 2016, 11:06:52 pm »
500in-oz is very high for a 1lb motor.The vex 775pro makes just over 100in-oz and weighs 0.8lb. Is that figure at the output of a gearbox? I think most are familiar with bot weight, wheel size and application guestimating then actual numbers as its much simpler with the same result.

143
Questions / Re: Prevent Weapon shaft from spinning when running drum?
« on: September 25, 2016, 03:35:46 pm »
the weapon shaft is just kinda floating and nothing to worry about, gluing it or taping it to be stationary won't help anything.

144
North America / Re: Great Canadian Bot Brawl
« on: September 05, 2016, 12:51:51 am »
just bumping this up, next event is next weekend ;)

145
Questions / Re: Designing an asymmetric disk
« on: August 18, 2016, 02:22:04 pm »
If ya use solidworks theres a little write up in the files section on the facebook group Combat Robotics on how to design single tooth disks

146
Questions / Re: Designing an asymmetric disk
« on: August 16, 2016, 04:00:39 am »
center of gravity should be the center of the weapon shaft ;)

147
Questions / Re: Brushless Motor design questions.
« on: August 14, 2016, 03:29:06 pm »
Standard pwm is 1000-2000, 1500ppm is neutral, beyond that, I don't know enough about brushless motors to comment :P

148
Progress Reports / Re: Team Whanton 2
« on: August 01, 2016, 11:25:31 pm »
1 3/4lb of spinning mass? seems kinda nuts in a 3lb bot :P How fast is it spinning? looks like a lot of reduction

149
Services and Products / Re: Heat Treating services?
« on: June 25, 2016, 01:14:04 am »
yup, getting someone with experience to do it isn't a bad idea. Heat treating it wrong could just lead to failure (like if you harden it one day and draw it back the next, it'll probably crack on first impact)

150
Services and Products / Re: Heat Treating services?
« on: June 15, 2016, 04:17:52 am »
you'll want to raise its temperature in an over to 1550*f and hold it there for probably 10mins (assuming said parts are under 1" thick which I figure is safe in bots) then quenched in oil. When its cooled in the oil until its warm put in in an oven and raise it to 800*f and hold it there for and hour. Remove and let it cool in air. Once its cool I'd typically do a second draw (oven to 8008f and cool again) to be safe but don't know if its necessary to do 2 draws with 4340. I'd also typically check hardness each time its cooled if you have access to the required equipment.

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