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i want my baby bot, baby bot, baby bot 179's off season project version 1

Dylan179

By: Dylan179
New: 05-23-2018 04:25 PM
Updated: 05-23-2018 04:25 PM
Views: 2100 times


i want my baby bot, baby bot, baby bot 179's off season project version 1

just a tiny bot with a big heart

19 fps adj with 6 775 pros assuming the robot will be 70 lbs it will in fact pull 45 amps pushing i don't think it will be that heavy (although i could check but i am lazy).

The claw has an interesting passive close claw that when a cube comes in contact the back wheels the front wheels don't come in contact with the cube when the cube is fully in the claw. This is for the front wheels to spin up, and when it is ready to fire the back wheels spit the cube out and when the back wheel closest to the front isn't touching the front wheels close up on the cube shooting it.

version 1 i will be doing another

p.s. i was informed that 971 and 254 there making there own over sized hex to get rid of shaft backlash. so what we will be trying is boring 3/8 hex gears to 7/16 round and pressing a 7/16 round tube through them and if the press isn't strong enough then we will tack weld them. The obvious worry for welding the gears is tempering so we shall see.

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05-23-2018 04:39 PM

gorrilla


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

That's a lot of motors on your drive train



05-23-2018 05:35 PM

wesbass23


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Quote:
Originally Posted by gorrilla View Post
That's a lot of motors on your drive train
6 motors has become relatively common.

Saw a spike in 6 minicim drives this year likely based on the research done last summer. Likely will see spikes in 6 775 drives if off season robots like these and the COTS options continue to develop.



05-23-2018 05:40 PM

Kevin Leonard


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

It probably doesn't matter much for this application, since this robot (if you're building it) won't see a ton of matches, and the arm is short, but I always get nervous about geared arms. I've seen them catastrophically break on partners before and I've seen them wear out and develop a ton of backlash over time.

When possible, I prefer to make the final stage of an arm chain+sprocket, but you've been at this longer than I have.



05-23-2018 05:49 PM

Kyle Warren


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Make the robot out of a milk crate so that other robots can hold you when they climb.



05-23-2018 05:51 PM

Type


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

If you need oversized 1/2" Hex, McMaster 6061 is oversized.



05-23-2018 06:25 PM

gorrilla


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Quote:
Originally Posted by wesbass23 View Post
6 motors has become relatively common.

Saw a spike in 6 minicim drives this year likely based on the research done last summer. Likely will see spikes in 6 775 drives if off season robots like these and the COTS options continue to develop.

Yeah I thought those cims were part of the drive as well as the 775's so I was thinking it was a 10motor setup



05-23-2018 06:44 PM

Andrew_L


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

We powdercoated VEX Pro hex shaft this year and got a snug fit on our gears to eliminate backlash. It's worth consideration if it's a resource that's readily available to you. We just told our sponsor to do the thinnest layer possible.



05-23-2018 07:45 PM

Niklas701


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Quote:
Originally Posted by gorrilla View Post
Yeah I thought those cims were part of the drive as well as the 775's so I was thinking it was a 10motor setup
Pretty sure those are bag motors not Cims but I could be wrong.



05-23-2018 11:09 PM

Csherm


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Great Work. I've been working on a similar (but smaller) version of this type of robot but lacked the motivation to finish the design. This post has given me some motivation to keep working.



05-23-2018 11:11 PM

NerdRage


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Super cool robot. If it ever gets built, I'd be interested to see how well it shoots! I showed this to my team and now they want to build a swerve-drive scale shooter robot



05-24-2018 11:09 AM

lbassett_21


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Wow that looks really cool. I would love to see it in real life. Nice work.



05-24-2018 09:44 PM

waxton


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Quote:
Originally Posted by Kyle Warren View Post
Make the robot out of a milk crate so that other robots can hold you when they climb.
genius



05-25-2018 01:45 AM

tickspe15


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Cool robot. You may want to consider either having a camera or some sort of tall object on the robot so you can see where you are while there is no line of sight to the robot. I noticed a few teams with very small robots struggling to be effective on the far side of the field this year.

There are lots of spots on the field where you can't see totes, i can't imagine it'd be easy to drive a robot that's barely bigger than a tote on this field



05-26-2018 10:30 AM

KamdenB


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Wow, if anything, that thing looks "mean."



05-26-2018 04:14 PM

messer5740


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

My favorite part is the battery holder. Do you have a closer picture of that or CAD that I can take a look at? Would you just manufacture that with a brake and a laser cutter / water jet?



05-26-2018 05:38 PM

GeeTwo


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Quote:
Originally Posted by messer5740 View Post
My favorite part is the battery holder. Do you have a closer picture of that or CAD that I can take a look at? Would you just manufacture that with a brake and a laser cutter / water jet?
Looks like some interesting brake work to make the battery holder. It looks like it could have been done more simply and securely with plate that started vertically.

What's the ground clearance? Even with the short wheelbase and track, the tall side plates on the 4" wheels look like they might be a problem on the platform ramp, particularly at the platform's corner.

OBTW, we're also doing a downsize for our offseason robot, but not going this far. We're going to do a 27.5" wide x 21.3" long 4 wheel robot, side plates equivalent to from last year's bot. We're still planning to bring the cube partially inside the frame perimeter, and only raising our intake arm by about 45 degrees. We ARE planning to use pneumatics to open/close the claw and to raise/lower the intake arm.



05-26-2018 06:30 PM

Dylan179


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Quote:
Originally Posted by GeeTwo View Post
Looks like some interesting brake work to make the battery holder. It looks like it could have been done more simply and securely with plate that started vertically.

What's the ground clearance? Even with the short wheelbase and track, the tall side plates on the 4" wheels look like they might be a problem on the platform ramp, particularly at the platform's corner.

OBTW, we're also doing a downsize for our offseason robot, but not going this far. We're going to do a 27.5" wide x 21.3" long 4 wheel robot, side plates equivalent to from last year's bot. We're still planning to bring the cube partially inside the frame perimeter, and only raising our intake arm by about 45 degrees. We ARE planning to use pneumatics to open/close the claw and to raise/lower the intake arm.

so this robot is 18x18 and the wheels are 3 in dia.

here are some pctures





05-26-2018 08:11 PM

messer5740


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

I LOVE THIS BATTERY HOLDER. Oh yeah just an FYI im totally stealing this and may make some minor mods to fit a KOP chassis



05-26-2018 08:59 PM

Dylan179


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Quote:
Originally Posted by messer5740 View Post
I LOVE THIS BATTERY HOLDER. Oh yeah just an FYI im totally stealing this and may make some minor mods to fit a KOP chassis
how so??



05-26-2018 10:26 PM

messer5740


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Quote:
Originally Posted by Dylan179 View Post
how so??
With modifying it for the KOP chassis? Im not a huge fan of the KOP battery holder, and i really like the breaker attachment on this one. Combining something like this along with the AM battery holder can make the battery really secure and the wires organized.



05-27-2018 03:14 PM

GeeTwo


Unread Re: pic: i want my baby bot, baby bot, baby bot 179's off season project version 1

Quote:
Originally Posted by Dylan179 View Post
so this robot is 18x18 and the wheels are 3 in dia.
OK, I stand corrected.
Quote:
Originally Posted by Dr. Banner in Avengers
This is much worse.
Quote:
Originally Posted by Dylan179 View Post
here are some pctures
I'm not entirely sure what the first two pictures are of, but if I'm reading these correctly, you have considered hitting the platform ramps head on and expect to climb on OK. Have you modeled (or driven) this hitting the platform edge at an oblique angle, or on the corner of the platform?



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