Search found 212 matches

by MarkR
Fri Aug 23, 2019 9:37 pm
Forum: Antweights
Topic: Team BLEEP build diary
Replies: 114
Views: 13608

Re: Team BLEEP build diary

I'm using 20:1 motors and my robots are a bit fast but still work. I did some adjustment in the firmware and got the speed about right.
by MarkR
Sun Aug 18, 2019 10:56 pm
Forum: Questions (and answers)
Topic: ESC battery and motor paring
Replies: 3
Views: 71

Re: ESC battery and motor paring

It's not clear if those are brushed or brushless motors, but in any case, brushed motors only draw their maximum current when stalled (i.e. at startup), so you won't get anywhere near the peak current unless all of the motors on one side are stalled, which is probably a bad situation anyway I think ...
by MarkR
Sun Aug 18, 2019 8:52 am
Forum: Questions (and answers)
Topic: 3D printing
Replies: 5
Views: 95

Re: 3D printing

1. Material choice "basic" PLA is nice and easy to print but has dubious mechanical properties. It's generally OK I think for internal parts of the robot where there is armour of something else outside. Don't expect it to last long if it takes a direct hit. PLA is also quite brittle and tends to cra...
by MarkR
Sat Aug 17, 2019 10:15 pm
Forum: Questions (and answers)
Topic: Graphene Batteries
Replies: 3
Views: 80

Re: Graphene Batteries

I get the impression that Hobbyking / Turnigy would claim their batteries contained Mithril and Dilithium crystals if they thought people would believe it :) I'm sceptical that this actually makes any difference, I think they're just normal lipo really, with a layer of unobtanium to make them sound ...
by MarkR
Thu Aug 01, 2019 6:52 pm
Forum: Events
Topic: RoboShowdown
Replies: 9
Views: 919

Re: RoboShowdown

IF I can make it, I'll bring Betsie and Stacie.

Then we can have that Betsie vs Mantis whiteboard you suggested. I love Mantis, it's brilliant (although it was my poor driving / weird control system which let me down last time)
by MarkR
Thu Aug 01, 2019 12:18 pm
Forum: Antweights
Topic: ESC Sanity check
Replies: 11
Views: 280

Re: ESC Sanity check

It's very difficult to produce a compact layout which doesn't have wires leaving from several edges of the board. With power, signal and motors, there have to be quite a few things. e.g. Dasmikro has awfully tiny nasty pads which are terrible to solder to, but still on both ends. It's a really good ...
by MarkR
Thu Aug 01, 2019 10:18 am
Forum: Antweights
Topic: ESC Sanity check
Replies: 11
Views: 280

Re: ESC Sanity check

Very interesting... it is the RZ7886, the DIP8 version of my favourite rz7899

https://lcsc.com/product-detail/Motor-D ... 28852.html

They should be as tough as old boots, if the other rz chips are anything to go by.
by MarkR
Wed Jul 31, 2019 8:38 pm
Forum: Antweights
Topic: ESC Sanity check
Replies: 11
Views: 280

Re: ESC Sanity check

It does look a little bit on the large side for an antweight ESC, and 5A per channel is definitely excessive, my N20 motors stall at about 0.5A, so even with two stalled in parallel that's still only 1 amp. I also noticed, on closer inspection of the pictures on various sites, that these ESC have a ...
by MarkR
Wed Jul 31, 2019 3:29 pm
Forum: Antweights
Topic: ESC Sanity check
Replies: 11
Views: 280

Re: ESC Sanity check

Do you have a multimeter? If you connect the ESC to the power and nothing else, the red and black wires on the servo-type plug (3-pin dupont connector) should give +5V from the regulator (BEC). Assuming that's ok, then can you measure the resistance between the various wires (with power off) - the b...
by MarkR
Wed Jul 17, 2019 11:27 am
Forum: Questions (and answers)
Topic: Basic Flipper Hinge Question
Replies: 9
Views: 1036

Re: Basic Flipper Hinge Question

For completeness - I avoided having a hinge completely and on Stacie, I just pivot the whole flipper arm on a pair of N20 motors with a coupler I made http://vectrex.org.uk/mark/flip_coupler.png http://vectrex.org.uk/mark/stacie1.jpg (Difficult to see as the part is matt black due to being made of P...
by MarkR
Sat Jul 06, 2019 10:30 pm
Forum: Events
Topic: Antweight World Series 58 - 29th June 2019
Replies: 84
Views: 7917

Re: Antweight World Series 58 - 29th June 2019

Chris,

Was AWS58, "The biggest robot combat event, ever?"

According to Antlog there were 121 robots. This has to be some kind of record.
by MarkR
Fri Jul 05, 2019 9:35 am
Forum: Antweights
Topic: The smart ant's and flea's
Replies: 70
Views: 16181

Re: The smart ant's and flea's

Unorthodox was amazing at AWS58, please, tell us how the walking mechanism works?

Or is it a super trade secret?
by MarkR
Mon Jul 01, 2019 10:21 am
Forum: Events
Topic: Coping with the demand (An EO's perspective)
Replies: 24
Views: 1531

Re: Coping with the demand (An EO's perspective)

I would certainly not be in favour of anything which discourages teams bringing joke robots, last-minute robots, or other kludgy things which are unlikely to win - they are certainly part of the entertainment. I didn't see any ducks on Saturday, but at least Diotant was there (when did Diotant stop ...
by MarkR
Mon Jul 01, 2019 9:55 am
Forum: Antweights
Topic: ESCs and channel mixing
Replies: 7
Views: 575

Re: ESCs and channel mixing

If the ESC doesn't have mixing built-in (if they are only one channel each, then they don't, there is nothing to mix) then either the transmitter or receiver will need to do mixing. I think that some of the fancier TXs can be programmed to do tank-mixing, but I don't have such a transmitter. I've pr...
by MarkR
Sun Jun 30, 2019 7:24 pm
Forum: Antweights
Topic: Peter Wallers Robot Ramblings
Replies: 744
Views: 107829

Re: Peter Wallers Robot Ramblings

Good stuff Peter, so we rate the rz7899 as "combat ready" ?

I also ran Stacie with the rz7899-based Malenki-ESC, and it ran nicely, it did a lot more heavy duty work in the kids' arena :) , and was still working at the end.