I print 5.6-5.7mm hex sockets in the chassis to hold the nuts in place on the end. (this is what I use for Hercules’ axles with Nyloc Nuts)
nyloc nuts mean they don’t unscrew
5.6-5.7mm hex sockets
noted!
Okay so I preperation for jan grocs, where no big dill (and me) will fight spinners for the first time, I was wandering, what is an ideal thickness for the shell/chassis/lid on the design? I have seen a few nasty spinners that look like they could rip my bot to shreds. Please help! I’m pretty sure I’ve asked this before but I can’t find the post. I’m using overture super pla plus btw.
I use 1mm walls in ABS, with 2mm walls in strategic locations, but I’m prepared to swap chassis in a hurry between fights.
given your forks and blades as replaceable armour then I think you’re probably gonna be ok.
if things break, then that’s the bit to re-enforce.
Currently the chassis is running 2.5mm overture super pla plus. The tpu wedges are also 2.5 approx. The forks are 5mm thick (i think). Is this okay?
All my ants run the default Bambu standard print profile, which is 2 walls with my 0.4mm nozzle - 1.6mm total plastic between the inside and the outside world (plus a few percent infill). It’s rare that anyone actually gets through both the inner and outer walls and into the soft gooey centre; usually either a big chunk flakes off the outside, or the opponent’s weapon digs in and my robot flies away (usually into the pit or OOTA).
There’s exceptions and unlucky hits, but in general you won’t take huge damage fighting antweight spinners - the physics scale such that the plastic is usually strong enough to take the hit, flake and split a little but stay together, and send the bot flying instead. In a lot of the really destructive “guts everywhere” fights you see, the explodee is usually in one piece but has just lost a top plate!
As Ben says, you have lots of forks and attachments sticking out the front of your robot. As long as you’re ok with them getting progressively shorter and shorter as the fight goes on, you’ll be fine!
Thank you Ben and Joe for the comments, I feel a lot better going into grocs now.
How can I change the bot/transmitter to reduce oversteer when driving?
Thanks so much everyone
Hollis
go to DR/EXP in functions setup, reduce dual rate.
And now I present to you…
NO BIG DILL V4:
It took a bit longer to assemble as expected due to being 2g overweight but I’ve made some minor adjustments and it now sits at 149g on the dot with the heaviest setup attached (wedge setup pictured above). There is a few screws that are a bit long so I could attach them but I can’t really be bothered to go through the hassle of taking off the motor mounts then attaching them again with new screws. For now I will just hope Ben G’s scale is reading the same as mine…
Anyway I just wanted to ask, the lid is a bit thin on NBD I think 2mm. Obviously if you managed to read the paragraph above without falling asleep, you will know that I don’t really have the weight to thiken it/ add metal plates. So I was thinking, if I faced a hammer saw at the upcoming GRoCS that I could just run one tpu fork on each side and screw on a extra 2mm of a plastic on the lid with some plastite screws. So my question, what plastic do I use? Really my only options I have available are tpu, overture super pla+ and I also have some sheets of polycarbonate from bbb.
Thanks for reading,
Hollis
Hi,
If the alternate configuration still fits in the box and is in weight then you’re fine to swap parts.
Obv. if you swapped a hammer saw for a plants fight that wouldn’t be sporting… 
Hi, Guido runs a 1mm lid. Shouldn’t be a problem as hammers that can do damage are pretty rare.
Quick update,
GRoCS happened and, spoiler alert: I didn’t do terrible!
Plant nbd (nbd v3) went 4-1 in groups and got through to top 4. It then lost semis but managed to get a lucky win in the 3rd place playoff when pstfu’s switch got turned off by a dent in the floor (or maybe it was me, who knows?) So essentially I cooked in plants with a tied best ever result of 3rd (also got 3rd at CAT4)
Here is the annoying part,
EVERY FULL COMBAT FIGHT I HAD WAS AGAINST A VERT
fortunately though most of them bounced around a lot and eventually went OOTA, big relief 
. So nbd went 3-1 overall with one bye in the group. Unfortunately it lost its quarter final matchup against phoenix’s vert, caustic.
So overall I’m quite happy with the result. The lifter arm on fc nbd got split in half quite a lot but I won’t change it, For reasons that will be explained in future topic….
Thanks all
Quick update,
I did change it:
before
and after.
I mostly just made the sides thicker (where it was breaking)
BUT…
My big worry now is, well, have a look for yourself….
I could make the main body smaller, but I might just hope that Bens scales will be nice to me at GRoCS. It may weigh slightly less as I don’t think I’ll run the wedges at GRoCS due to the fact that this NBD will be entering plants in march. It’ll be making way for a new robot that I will reveal
Hollis
I’m sure you could easily remove a gram from somewhere. Even by hand with a scalpel maybe.
Just a quick check,
I noticed a few months ago, the robot stopped making its little tune when turned on. It still works perfectly fine when I turn on the transmitter and start driving around. Is this anything to worry about or no?
Thought I’d do a quick event update from GRoCS 6, NBD somehow went 6-0 in the groups??? (DWI also went 6-0) giving me a 12-0 score with both my robots in groups (what?!?) it won quarters but lost semifinals against a SVRN grabber with very good ground game. I managed to win the 3rd place tho, against a well driven loan Hercules v1. So overall I am very happy with the performance, and my driving. Will be taking it to PLaNTs at BBB June. It may need some lifter changes so it doesn’t snap in half when fighting spinners (even plastic ones!)
Hollis
BBB June went great!
It was my first time doing 2v2s and fighting plastic spinners but I brought a lifter upgrade to the party!
Essentially I just made the top part of the lifter arm tpu as that’s what was getting hit but the spinners and then causing the lifter arm to break.
I was paired up with my sister for this event with her robot, gecko. A eman Carrillo lifter bot with a modified lifter arm:
We went 3-1 in groups. Not to show off or anything but I did most of the work, my sister still needs some practice driving. The first match, gecko fell out in the first minute but I managed to put on a great performance, granting us the GD. In the second match we faced of against Phoenix and his terrifying plastic hammer saw, and (I forgot their name, sorry!)'s crazy sit and spin. The match started okay with me getting a few flips, Phoenix with some near miss slices and the sit and spin, well, spinning. Eventually I got a good push on Phoenix and after some messing around near the pit I got him out. At the same time, the sit and spin had been switched off! The third fight was against Craig’s really cool looking anxious and joes amazing forklift robot. The match was mostly me having the ground game on Craig and going to work, while after around a minute, Joe got stuck like this:
Then in pushing Craig out, I got stuck on the edge of the pit drop off. This lead to some confusion because I believe Joe hadn’t been counted out for reasons I’m unsure about. But he just tapped out, which was nice 
.
Also, at one point in that fight, I got one of my favourite ever flips with NBD, landing Joe like this:
The last fight was against this duo of a powerful flipper, and grab and lifter.
I made a silly mistake at the start, going way to aggressive on the grab and lifter bot, giving him and easy push out of the arena on me. This left a 2v1 on gecko, which ultimately led to the flipper pushing gecko out.
We won the quarter finals against for forks sake and skitapuss when for forks sake got a push on me but I escaped at the last second and he tumbled into the pit. Then is was a 2v1 and we eventually got skitapuss out. Semifinals was against bens plant general grievous and Josh’s star burst (an increadibly long, forky, jelly baby style robot that had to start on its side to fit in size) Ben unfortunately pitted himself early on but starburst brought home the win for them scooping me and gecko up with its annoyingly good ground game and putting us both 
.
3rd place match was against fatal deviant and this lifter I didn’t catch the name of:
The fight started with that lifter 
immediately pitting gecko, then I flipped out fatal deviant and after some close moments i managed to set the lifter up upside down in front of the pit for an easy push out.
So yeah! 3rd place! And, we had a whiteboard plants rumble and I won that to!
A good day overall for NBD.
Where to next?
Possibly CAT5, Definately GRoCS!
Thanks for reading,
Hollis
Really enjoyed our fight! Super well driven bot with great ground game as I discovered haha. Congrats on the 3rd place
