Search found 375 matches

by MarkR
Sun Aug 18, 2019 8:52 am
Forum: Questions (and answers)
Topic: 3D printing
Replies: 5
Views: 17597

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 te...
by MarkR
Sat Aug 17, 2019 10:15 pm
Forum: Questions (and answers)
Topic: Graphene Batteries
Replies: 3
Views: 15743

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: 23441

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: 20
Views: 40707

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: 20
Views: 40707

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: 20
Views: 40707

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: 20
Views: 40707

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: 28664

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: 281772

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: 101
Views: 200831

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?