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Messages - MikeNCR

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Event Results / Botrank Updates on Hold Temporarily
« 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:

Questions / Re: Antweight drive system help
« on: April 26, 2018, 09:59:01 am »
I'd strongly suggest the silver spark over the gold spark, the geartrain is much more robust and better suited to combat. The motors will handle 3s lipo fine. You'll also likely want more speed than the 50:1's will give you. The 20 or 30:1s will likely leave you much happier. I'd be inclined to go 20:1 were I building it, but I also generally favor having the option of higher top speed. One nice thing is that you can buy the gearboxes separate, try both, and see which you prefer-

On the pushing force math, I think you forgot to include the gearing, as on 3s with the 50:1 box the output torque should be 48.46oz-in per the chart on the fingertech site.

Event Results / Re: Motorama 2018
« on: March 21, 2018, 10:58:31 pm »

Event Results / Battle Beach Lite 2017-12-02
« on: December 08, 2017, 08:57:06 am »
Battle Beach Lite
0,Nano Nightmare,Doomclone
0,Blockbuster,Spark Remover
0,Nano Nightmare,Skeeter From Hell
0,Blockbuster,Regret's Roulette
0,Doomclone,Regret's Roulette
0,Skeeter From Hell,Spark Remover
0,Skeeter From Hell,Spark Remover
0,Blockbuster,Nano Nightmare
0,Nano Nightmare,Skeeter From Hell
0,Nano Nightmare,Blockbuster
0,Nano Nightmare,Blockbuster
1,Night Fury,Mucho Destructo
1,CinnaMonster,Batter Blaster
1,Atomic Wedgie,Werewolf
1,Social Kitty,Chainsaw
1,Night Fury,Little B
1,Batter Blaster,Mucho Destructo
1,Chainsaw,Batter Blaster
1,Shazbot,Little B
1,CinnaMonster,Social Kitty
1,Night Fury,Atomic Wedgie
1,Shazbot,Social Kitty
1,Chainsaw,Atomic Wedgie
1,Night Fury,CinnaMonster
1,Night Fury,CinnaMonster
3,Hailstone,Double Crosser
3,Hyper Doctor Jr.,Hyperling
3,Fantom,Dead End
3,Hyperling,Dead End
3,Hexys Revenge,Hailstone
3,Hyper Doctor Jr.,Fantom
3,Hyperling,Hexys Revenge
3,Fantom,Double Crosser
3,Hailstone,Hyper Doctor Jr.
3,Hyper Doctor Jr.,Hyperling
3,Hailstone,Hyper Doctor Jr.
15,Clown Fiesta,Godzilla
15,Clown Fiesta,Sonic the Wedgehog
15,ShaBoomBox,Mad Cow Disease
15,TBD,Sonic the Wedgehog
15,Mad Cow Disease,Godzilla
15,TBD,Mad Cow Disease
15,ShaBoomBox,Clown Fiesta
15,Clown Fiesta,TBD
15,ShaBoomBox,Clown Fiesta

Event Results / Central Illinois Bot Brawl 17
« on: November 17, 2017, 04:01:50 pm »
Central Illinois Bot Brawl 17
1,10 Days Til Destruction,Sky Shark
1,This Is A Test,Calamity Jazz Hands
1,Holy Joe,Wombatchewed
1,Ignition,Sky Shark
1,Ygritte,Calamity Jazz Hands
1,Ignatz,Circular Reference
1,10 Days Til Destruction,Odium
1,Betula,The Snip
1,This Is A Test,Holy Joe
1,Taster,The Krave Monsters
1,Some Putty's In Trouble,Ignition
1,Pushy Wushy,Peter Pan
1,The Krave Monsters,Holy Joe
1,Ignition,Peter Pan
1,Ygritte,Circular Reference
1,The Snip,Stretcher
1,Betula,10 Days Til Destruction
1,taster,This Is A Test
1,Pushy Wushy,Some Putty's In Trouble
1,The Krave Monsters,Spinook
1,Ignition,10 Days Til Destruction
1,This Is A Test,Ygritte
1,The Snip,Some Putty's In Trouble
1,Pushy Wushy,Taster
1,Ignition,The Krave Monsters
1,The Snip,This Is A Test
1,The Snip,Betula
1,Ignatz,Pushy Wushy
1,The Snip,taster
1,The Snip,Pushy Wushy
1,Ignatz,The Snip
3,Al6bb1,Honorable Mention
3,k-too,Phantom II
3,From the Top of Skyscrapers,Death from Above
3,Icky Mouse,Elepha-Flip
3,Phantom II,Honorable Mention
3,King Googly,Boomzilla
3,Catalpa,From the Top of Skyscrapers
3,Cyanide,Icky Mouse
3,Boomzilla,Death from Above
3,From the Top of Skyscrapers,Dandelion
3,Phantom II,Icky Mouse
3,k-too,King Googly
3,Phantom II,From the Top of Skyscrapers
3,Phantom II,King Googly
3,Phantom II,Boomzilla
3,Phantom II,Catalpa
3,k-too,Phantom II

Event Results / Battles at Maker Faire Orlando 2017
« on: October 30, 2017, 07:15:16 pm »
Battles at Maker Faire Orlando 2017
0,Skeeter From Hell,Regret's Roulette
0,Firecracker,Nano Nightmare
0,Krabby,WIDE LOAD
0,Sorry Charlie,Paw Print
0,Mustachio,Hard Cutie
0,Neon Knight,Spark Remover
0,WIDE LOAD,Nano Nightmare
0,Hard Cutie,Spark Remover
0,Skeeter From Hell,Blockbuster
0,Sorry Charlie,Blind Drive
0,Mustachio,Neon Knight
0,Regret's Roulette,Neon Knight
0,Blind Drive,WIDE LOAD
0,Paw Print,Krabby
0,Blockbuster,Hard Cutie
0,Skeeter From Hell,Firecracker
0,Mustachio,Sorry Charlie
0,Regret's Roulette,Blind Drive
0,Blockbuster,Paw Print
0,Firecracker,Regret's Roulette
0,Blockbuster,Sorry Charlie
0,Skeeter From Hell,Mustachio
0,Firecracker,Skeeter From Hell
0,Firecracker,Skeeter From Hell
1,Verbal Irony,TinyBot
1,Werewolf,Ting Tang
1,Temper tANTrum,Bad Owl
1,Verbal Irony,Batter Blaster
1,Stalker CombatANT,Chainsaw
1,Soco Loco,Foolproof
1,Atomic Wedgie,Werewolf
1,Poco Tambor,Happy Happy Kill Kill
FORFEIT 1,Temper tANTrum,Brainstorm
1,Shiny Wedgie,Hamburger Helper
1,Hamburger Helper,TinyBot
1,Foolproof,Ting Tang
1,Pesticide,Bad Owl
FORFEIT 1,Hamburger Helper,Brainstorm
1,Werewolf,Happy Happy Kill Kill
1,Pesticide,Batter Blaster
1,Klazo,Verbal Irony
1,Stalker CombatANT,Soco Loco
1,Poco Tambor,Atomic Wedgie
1,Shiny Wedgie,Temper tANTrum
1,Soco Loco,Hamburger Helper
1,Verbal Irony,Werewolf
1,Chainsaw,Temper tANTrum
FORFEIT 1,Pesticide,Atomic Wedgie
1,Stalker CombatANT,Klazo
1,Poco Tambor,Shiny Wedgie
1,Verbal Irony,Soco Loco
1,Stalker CombatANT,Poco Tambor
1,Shiny Wedgie,Verbal Irony
1,Pesticide,Shiny Wedgie
1,Pesticide,Poco Tambor
1,Stalker CombatANT,Pesticide
3,Bloodless,Project: Terminus
FORFEIT 3,Hexys Revenge,TailSpin
3,Fantom,Double Crosser
3,Hexys Revenge,Dead End
3,Trilobiter,Demon Spawn
3,Project: Terminus,Demon Spawn
3,Dead End,Hyperling
FORFEIT 3,Double Crosser,TailSpin
3,Trilobiter,Hexys Revenge
3,Project: Terminus,Dead End
3,XK-1,Double Crosser
3,Project: Terminus,Fantom
3,XK-1,Hexys Revenge
3,Project: Terminus,XK-1
3,Project: Terminus,Bloodless
3,Trilobiter,Project: Terminus
15,Sonic The Wedgehog,Godzilla
15,ShaBoomBox,Clown Fiesta
15,Clown Fiesta,Animosity
15,ShaBoomBox,Sonic The Wedgehog
15,Sonic The Wedgehog,F-13
15,Clown Fiesta,F-13
15,Sonic The Wedgehog,Animosity
15,Clown Fiesta,Sonic The Wedgehog
15,Clown Fiesta,Godzilla
15,ShaBoomBox,Clown Fiesta
30s,Nyx,Remains of Irma
30s,Morrigan,Remains of Irma
30s,Spanky,Remains of Irma
30s,Nyx,Sporkinok SC
30s,Spanky,Sporkinok SC
220,Flailure to Launch,AG-gressive
220,Breaker Box,Maulboard
220,Hype or Shock,Fauxhawk
220,Breaker Box,AG-gressive
220,Hype or Shock,Maulboard
220,Breaker Box,Flailure to Launch
220,Gruff,The Extinguisher
220,Hype or Shock,AG-gressive
220,The Extinguisher,Flailure to Launch
220,Gruff,Flailure to Launch
220,Hype or Shock,Flailure to Launch
220,The Extinguisher,AG-gressive
220,Breaker Box,Hype or Shock
220,Breaker Box,The Extinguisher
220,Breaker Box,Gruff

Questions / Re: Sportsman Saw Arm
« on: October 29, 2017, 01:54:11 pm »
775's make for a decent drive motor option in the 30lb class. With 5" wheels the 16:1's will probably be a bit too fast, and the 64:1's will likely be far too slow. You can play around with this to get an idea what you'll end up with - (use the nominal battery pack voltage for the voltage number, so 3.3v per cell for LiFe) This gearbox gets to a not bad spot speed wise- (13.5ft/s top speed with 5" wheels, if you want a bit faster 6" wheels would work too)

If you're going A123 or another LiFe chemistry you'll likely want to run a 6s pack, or set of smaller packs in series that total 6s (19.8v nominal)

The drill motor may be enough for the saw, but it's hard to say for sure as it's not a setup I've messed around with. (Spanky used a cordless circular saw motor with a bit of extra gearing)

A gearmotor with some extra reduction is a solid option for the arm. You've got a few options for how to protect the motor/gearbox - Torque limiter, current limiting, limit switches, or hope. On Nyx's lifter I use current limiting to keep from massively overdriving the lifter and that's been a reliable option. The axe setup on Nyx uses a torque limiter and it's worked quite well there and has been plenty good for self righting.

An impact at the end of the arm will apply the torque to the system, so I'd lean against backdrive resistant systems (worm gears or similar) as the system being driven back can absorb a lot of the force without doing as much damage to the mechanism.

If you want a good look at how I dealt with some similar issues, take a look here:

Questions / Re: Sportsman Saw Arm
« on: October 24, 2017, 03:27:30 pm »
The cut-off disc will be less prone to getting stuck, but will be more vulnerable to side loading and will be easier to break. It may be worth having a few different styles of blades on hand and a way to change them out quickly to adapt for who you're fighting.

Without more detail on your weapon system, it's hard to say if you're making the correct motor choice. With that said, I had been considering the A23-150 from ampflow for the rebuild of Spanky's circular saw attachment.

There aren't many servos at a scale that would suit the arm of a 30lb bot well. The easy route would be gearing a normal motor low enough that the braking torque on the motor and the bit of resistance in the gear train is enough that it stays put. To give an example, with Nyx, the lifter arm is geared 9:1 beyond the DeWut in low gear. The arm generally will stay in position unless I provide control input or a large external force is exerted on it. Another option would be finding a gearbox (or building one) that's got a worm stage or other similar mechanism that resists backdriving. It'd likely be heavier/more complicated, but it would work.

You'll either need to replace the connector on the battery with one of the other ones you're looking at or find the type of connector the battery uses and use that style of connector for at least the connection between the battery and switch.

Mike, hope all's well!  I got a bunch of parts now and I'm trying to figure it out!  Ha..

If I want to buy plugs so that I can solder the 2 red and black ends to the motor and have a plug to plug in to the battery, which ones would I use?  This is the battery I have:

Something like this?

or this?

They're mentioned here at 5:03:

Thanks for any help!  Chris

The second one is more along the lines of what you'd want for running power around the bot. I'd suggest having connectors like that between the battery and power switch as well as between each esc and motor to make it easy to work on or replace motors/gearboxes. You'll want to replace the existing main plug on the battery with whatever type of connector you use for the bot. (On that note, you may want to use a different size connector for the Battery-to-switch portion and the esc-to-motor portion so you can't hook them up incorrectly) I also put the female connector on the battery side of the circuit in all of my bots so with connectors that have the contacts exposed on their male connectors there's less risk of a short when something's unplugged.

I'd also suggest a read through this post on my team site:

This image from my instructable may be a handy reference as well-

Awesome.. Thanks for the info.. I'll def go to FI either way.  There's a slim chance I can still get this together though.. ha.  And I'm entered, so may as well give it a shot.. right?  Ha.. 

Would this need a brushed ESC or a brushless ESC?  Thanks!

Brushed ESC. I'd suggest the RageBridge in this application with the current limit set to around 50A. Using the banebots 775 motor with a 16:1 gearbox (this should be moderately comparable) with this calculator I get 25A for wheelspin per motor -

The reason I suggest double that for the limit is that you may have another 30lbs sitting on top of your bot and having enough power to spin the wheels is handy.

You'll need to select quantities(2 for each for a single gearbox) for step 2 on the gearbox, the wheel looks correct. You may be best off either ordering two gearboxes worth of parts now to give a bit more build time or deciding to not worry about getting the 30 built in time for Franklin and focusing on getting that done for Motorama. Even if you do the latter, I'd suggest attending FI with whatever else you've got for the experience.

In addition to the base kit you'll need gear kits and ring gear kits that will reach your desired ratio (for example, two 4:1 kits will create a 16:1 gearbox and you'll need two ring gear kits - 4*4=16)

If you're not using CIM motors or dual motors you won't need those.

You'll also want one 775pro per gearbox assuming that's the motor you'd like to use.

You don't need the encoder.

The 1/2" hex shaft has a 1/4-20 tapped hole at the end of it. You can use that with a bolt and washer to prevent the wheel coming off of the end of the shaft. (The 1.575" shaft length should work nicely with the 1.5" wide Colsons so you'll just need a washer that's sized for a 1/4" bolt that's got a large enough outer diameter to prevent the wheel from sliding over it - probably 3/4" OD at a minimum)

I've not used them myself, but these in the right ratio may work well-

The hex shaft option they've got for those will also work with these-

This motor will pair well with the gearbox-

You'll probably want a total gear ratio somewhere in the 16:1 to 26:1 range for a 3-4" wheel (this would mean a 2 stage gearbox)

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