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Author Topic: Team Thrasher / Sunny Robotics  (Read 1902 times)

rumham

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Team Thrasher / Sunny Robotics
« on: June 02, 2017, 04:44:30 pm »
Hello,

Linked below is a brief history of my team and the build report of Rum Ham XL my 3lb bot.

Build report:
http://imgur.com/a/zp6S3

Videos:
https://www.youtube.com/watch?v=CoaTV_VJ8OU&list=PLIkQKO7gRmwM8emBHAa74N7Ib6dMKEibX



« Last Edit: November 29, 2017, 08:08:19 pm by rumham »
RumHam XL - 3lb Undercutter
Bird Law - 1lb Clamp bot
Undisputed Champion - 30lb flamethrower

zacodonnell

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Re: Team Thrasher
« Reply #1 on: June 18, 2017, 09:36:17 am »
I really enjoyed your build report. My first ever live competition was when I was 15 at the rc&g in Pittsburgh and I might even remember your bot. Man that was a long time ago!  I'm glad you're getting back into the madness and I really like how you did the weapon mount there.

Zac

rumham

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Re: Team Thrasher
« Reply #2 on: June 22, 2017, 01:46:34 pm »
Thanks Zac. I'm a big fan of your robots, especially Magneato.
RumHam XL - 3lb Undercutter
Bird Law - 1lb Clamp bot
Undisputed Champion - 30lb flamethrower

rumham

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Re: Team Thrasher
« Reply #3 on: October 26, 2017, 06:29:29 pm »
Here is the build report of 'The Undisputed Champion' my 30lb flame throwing powerwheels!

Build report:
https://imgur.com/a/Cr7WB

Videos:
https://www.youtube.com/playlist?list=PLIkQKO7gRmwN4_VrNRBQLdgyK1lbG6UGW

« Last Edit: March 08, 2018, 03:30:13 pm by rumham »
RumHam XL - 3lb Undercutter
Bird Law - 1lb Clamp bot
Undisputed Champion - 30lb flamethrower

rumham

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Re: Team Thrasher
« Reply #4 on: November 02, 2017, 05:16:54 pm »
Here is an update for RumHam XL. These are the changes I made for AVC 2017.

Build report:
https://imgur.com/a/UqyLP

Best fight from AVC:
https://youtu.be/Xi-mzxQBKis


RumHam XL - 3lb Undercutter
Bird Law - 1lb Clamp bot
Undisputed Champion - 30lb flamethrower

zacodonnell

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Re: Team Thrasher / Sunny Robotics
« Reply #5 on: January 14, 2018, 11:10:17 am »
Very cool. Has it fought any midcutters? The design is a little closer to the first undercutter I ever saw in person (http://www.lazytd.com/rc/rcg/hworf2.jpg) than the more common designs you see these days. Seemed nice and reliable in that video.

-Zac

rumham

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Re: Team Thrasher / Sunny Robotics
« Reply #6 on: January 15, 2018, 11:25:46 am »
Very cool. Has it fought any midcutters? The design is a little closer to the first undercutter I ever saw in person (http://www.lazytd.com/rc/rcg/hworf2.jpg) than the more common designs you see these days. Seemed nice and reliable in that video.

-Zac

I haven't fought any midcutters or even traditional horizontal spinners yet. The limited weapon reach would likely put me at a disadvantage. This design has however proven to do really well agents non wedge vertical spinners and drum bots.   
RumHam XL - 3lb Undercutter
Bird Law - 1lb Clamp bot
Undisputed Champion - 30lb flamethrower

rumham

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Re: Team Thrasher / Sunny Robotics
« Reply #7 on: January 15, 2018, 11:48:21 am »
Parts back from water jet. 3 ant weapons and 3 beetle weapons. all 3/8 S7. The ant weapons will be for a yet to be designed pizza slicer clone. The beetle weapons will be for the new rum ham. I still need to CNC machine the NTM v2 motor housing shape into the beetle weapons before heat treating.


 
RumHam XL - 3lb Undercutter
Bird Law - 1lb Clamp bot
Undisputed Champion - 30lb flamethrower

Koolaid64

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Re: Team Thrasher / Sunny Robotics
« Reply #8 on: January 15, 2018, 08:47:52 pm »
Phew those are some thin cross sections.  Keep us posted on how they hold up.

-Kyle

rumham

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Re: Team Thrasher / Sunny Robotics
« Reply #9 on: January 16, 2018, 12:42:36 pm »
Phew those are some thin cross sections.  Keep us posted on how they hold up.

-Kyle

Fingers crossed.
The ant weapons look the way they do because I had very little space left on the S7 stock before waterjet. Two of ant weapons were actually cut out of the space in between the spokes of the disk. The disk design resulted from the need to save weight. I really wanted to use 3/8 material but making a disk weigh less than one pound at 7.5'' was really difficult. The result was a really skinny disk with two spokes. The two spokes did however allowed me to make more ant weapons so that was a plus. Will the ant weapons and beetle disk break? Maybe; but I can always fall back on the bar for the beetle. I don't think the bar is going to break.
« Last Edit: January 16, 2018, 12:45:59 pm by rumham »
RumHam XL - 3lb Undercutter
Bird Law - 1lb Clamp bot
Undisputed Champion - 30lb flamethrower

Infernaltank

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Re: Team Thrasher / Sunny Robotics
« Reply #10 on: January 16, 2018, 06:14:44 pm »
Are you coming to Motorama this year? I'm really interested in seeing this bot if you are. I'm really interested in building an undercutter.

rumham

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Re: Team Thrasher / Sunny Robotics
« Reply #11 on: January 17, 2018, 10:39:35 am »
Are you coming to Motorama this year? I'm really interested in seeing this bot if you are. I'm really interested in building an undercutter.

I will be at Motorama this year but I wont be bringing the undercutter. I don't expect to have it finished by then. It should be finished for Robogames. For Motorama I'm just bringing my prototype plastic ant 'bird law'. It should make for great cannon fodder.

« Last Edit: March 07, 2018, 04:42:51 pm by rumham »
RumHam XL - 3lb Undercutter
Bird Law - 1lb Clamp bot
Undisputed Champion - 30lb flamethrower

rumham

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Re: Team Thrasher / Sunny Robotics
« Reply #12 on: March 07, 2018, 04:49:10 pm »
Here is my build report for Bird Law my plastic ant I took to Motorama 2018

Build report:
https://imgur.com/a/YNWrk

Videos:
https://www.youtube.com/watch?v=Qjwwdo41_rQ&list=PLIkQKO7gRmwOvs8guNn66k913Ze-D1YDs

« Last Edit: March 08, 2018, 03:31:17 pm by rumham »
RumHam XL - 3lb Undercutter
Bird Law - 1lb Clamp bot
Undisputed Champion - 30lb flamethrower

zacodonnell

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Re: Team Thrasher / Sunny Robotics
« Reply #13 on: March 08, 2018, 08:32:02 pm »
It took me a while to figure out how the whole thing worked, but I think I've got it now. Basically the timing belt on the large rear axle turns a jack shaft in the middle of the bot, which drives a gear pair for the claw. When the claw can't rotate anymore because it grabbed somebody or hit the end of travel, the gears can no longer rotate. This means if you keep rotating the pulley on the back axle the timing belt is stuck, so the top of the timing belt will become a winch cable that pulls the whole arm assembly around the rear pulley/axle.

That's pretty clever! The mechanical (dis)advantage of such a long lever arm means the belt/chain you're using as a tension member better be pretty stout.  As you scale the design up you might have to go to some pretty serious chain to make it work. While I enjoy such projects more than most people, I do have to ask if you think all that chain/pulley/bearing stuff works out to be more efficient than a secondary clamping motor for the claw. Especially as you scale up I think it will be diminishing returns pretty fast.  Can't beat the coolness factor though!

I think you should totally build a sportsman version. When you do, it can hang out with Magneato in a competition for most craziness in the box at once.

Thanks for taking the time to do a build report and picture rundown

-Zac

rumham

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Re: Team Thrasher / Sunny Robotics
« Reply #14 on: March 12, 2018, 05:34:22 pm »
As you scale the design up you might have to go to some pretty serious chain to make it work. While I enjoy such projects more than most people, I do have to ask if you think all that chain/pulley/bearing stuff works out to be more efficient than a secondary clamping motor for the claw. Especially as you scale up I think it will be diminishing returns pretty fast.

Thanks for the kind words Zac! I'm going to try and keep just one motor for the lifting and clamping for larger builds, mostly for the coolness factor. I like all the gears and pulleys required to make it work even if it's not the most practical.

--Luke
RumHam XL - 3lb Undercutter
Bird Law - 1lb Clamp bot
Undisputed Champion - 30lb flamethrower