Current Robots-Near Chaos Robotics (East)

Mr. Self Destruct
30lb
2wd via 18v dewalt motors
s28-150 Magmotor powered bar (28x3x3/8")

Status: Electrical system is being worked on. Waiting on new "Firecracker" speed controller and Wills new power switch to complete. Debut will likely be Franklin Institute or the yet to be named North Carolina competition in the winter.


Interstellar Overdrive/Apollyon
15lb/12lb
2wd via Mini-EV motors
Wedge & Steel claws

Status: Being redesigned. Old chassis and gearboxes have been scrapped. New Mini-EV gearbox is being designed. Redesign intent is to lighten the main chassis while improving drive system reliability. This will allow for interchangeable front manipulators. Cad drawings will be posted once I've done them. Also looking into the P60 gearbox as a potential replacement gearbox.

I've finished a switch.. but it's really hard to machine some of the contacts. Once I make a second one, I'll start sending them around.

Sounds good, with the way I do the electronics, I'll need two switches (Isolated weapon and drive power), so just let me know when you're taking orders and how much.

got it! when would you need them by?

Any time in the next month would be fine. Still waiting for Robot Power to release the Firecracker
( http://www.robotpower.com/products/firecracker/ )

okay.. and you need 2?

Yes.

Playing with potential design alterations. Here's option 1:



Drive: 550 motors through banebots p60 gearboxes(16:1)
Power: 5 Cell A123 (Yes, I'll have spare motors!)
Special Feature: Interchangeable front attachments

I should clarify that I use Rhino3d as essentially a 3d sketching program for checking ideas and component layouts.

we run bb 550's with fans on them / 5 cell A123's and haven't smoked one yet....16:1 as well....with 3" wheels it's quite fast and pushes very well also

This was on our rattlers

The new Ti bots are using a hotter motor, smaller/wider wheels and a belt reduction....much more torque and same or more top speed. Hard to keep the wheels from spinning tho...

What motors are you using?

On a different note, I'll probably have most of the electrics on Mr. SD done within a week or two.

I can't say which ones we'll end up with, but we are looking at tritons, Integys, Venoms and Trinities , depending on the bot..but not any of the really hot winds....

Brush wear on the rebuildables is not great at higher voltages.

Depending on budget anything from a triton on up seems pretty good.

btw: If you or anyone has any suggestions on 540/550 motors to try.....please let me know

Thanks

I've been informed that there's a new 42mm gearbox (non-banebots) on the way for RS775 motors that'll be on display at RoboGames this year. I'll be giving them a look before committing to a specific gearbox solution.

we tried the banebots 550s and duratrax 550s for dethinator this year. banebots DON'T have RF suppression capacitors in them, while the duratrax do. But the duratrax run hotter (and faster). Idk.. i wouldn't really recommend either. They were both pretty cheap.

MikeNCR wrote:

I've been informed that there's a new 42mm gearbox (non-banebots) on the way for RS775 motors that'll be on display at RoboGames this year. I'll be giving them a look before committing to a specific gearbox solution.

If you go, try and get us some info and maybe pics??

Thanks

I won't be at RG, but I suspect pics will be online soon.

I'll quote the person who's going to be releasing them:

Quote :

We're importing a new 20:1 42mm gearbox from China. It will come mounted to an RS775 motor so I guess it is really a gearmotor. It has power somewhat less than the Mini-EV. The motor is wound for 14.4V. We should have some to show at RG this year. If you're there you can come and check them out. The pinion looks the same as the GB42 pinion but I haven't actually compared them.

and

Quote :

Our gearbox is pretty heavy steel but it is solid. In testing we mounted a 2' bar to the output shaft, spun up to speed and repeatedly whacked it against a solid surface. The bar bent and the output bearing got kind of gritty sounding but the gears inside were perfect. We also tried repeated stall testing to see if the pinion would spin or the carrier pins would pull out. No problem even with the motor smoking. So we're happy with this gearbox. Hopefully the production units will be just as tough.

Sounds promising...I'd like to know the weight as well???

Most of the work I did today was internal. Most of the wires have been run, just waiting on my new kill switches and firecrackers at this point.


Gearbox & motor are supposed to be 28oz each, so just a bit lighter than the GB42's I was using.

OH DANG! THAT THING IS MEAN!

I'd hate to go up against that.

SenaiERI

it's gonna pack a big punch

The question is whether it can withstand it's own power...looks like a lot of plastic

No question, something is going to go flying.....

Good job!

Yep, there's a reason it's named Mr. Self Destruct.

Here's a shot of just the chassis-


Color code:
Dark Grey-Grade 5 Ti
Light Grey-2024 Alu
Greenish-Garolite

Baseplate is garolite, top armor is uhwm.

what's the blade alone weigh??

6 to 10 pounds???

a bit under 9# iirc.

That's one evil looking weapon--and 9 pounds? Dear lord!

I do wonder, just looking at it, if it's gonna pop wheelies (like a lot). Also, I've wondered for a while if the angled bar causes anywhere near the gyro effects of a drum/vertical disc. With that kind of mass, I'm guessing you'll find out!!

PS for Will--what's the status with the switches? I'm guessing that the 'hard to machine' parts are the copper ones. . .most manufactured copper parts are stamped from sheet--maybe the way to go is to cut steel dies and try that, or heck, pay someone to waterjet 'em. As soft as Cu alloys are, it should cut like butter and thus be quick and cheap to 'jet.
Or, is the real problem your current location (I seem to remember CC as one of your summer haunts?)

As far as gyro stuff goes, you can see some of what is going to happen in this video of my old LW- https://www.youtube.com/watch?v=ICid7VEZUOI&feature=channel_page

That's the same weapon motor/gearbox, 1/2" thick bar(30lber bar is 3/8") and a 52.5lb robot with a differently shaped chassis.

Having the center of rotation at around the mid point front to back should help with the gyro dancing. I'm kinda hoping that if I turn at full speed in the right direction I can make the bot wheelie.

Do you have any video of you testing it? If not, as soon as you do test it, please post it so we can see. It looks so amazing, I want to see what I'll be up against next year.

By the way, nice Ruiner match. Silly hammer bots. You can't beat a spinner.

By the way(2), it looks like you blade is reversible. Is this so? And if it is, can you reverse it during the match or do you have it wired one direction and have to physically switch the wires to the motor.

SenaiERI