Unnamed featherweight

[Danjr1]

just a few photos of my build. specs are:

4x 12v drill motors
12v Nimh battery
4x rc marine ESCs
2.4ghz radio set
GWS mixer
robo challenge 100mm wheels
20mm HDPE chassis

Just gotta get my hands on 2 failsafes and some lids and it will be running. got a feeling its going to come up underweight so the lids and armour maybe made of some form of steel. weapons will probably be two big spikes. any other advice is welcome!

[calumco]

Re: Unnamed featherweight

hey, looking like a good first robot, but im sure you wont want 4 speed controllers....... you'd be linking each sides 2 drive motors to one speedo meaning you'll be using 2 speed controllers. im not familar with those speed controllers, but did u consider getting the electronize 30A ones? as they'd probabily be better suited.

calum

[Danjr1]

Re: Unnamed featherweight

somebody on the forums found them if i remember rightly. 50A forwards/ 20A reverse. was mainly down to cost (from ebay). my plan is to build something fairly cheap then improve it over time with better components. thats the reason for the empty-ish space inside i.e. for motorised weapons. the plan is to have the receiver then connect each side with servo y leads to the ESCs (with the mixer and failsafes in there).

[typhoon_driver]

Re: Unnamed featherweight

Looking good. Get an active weapon on it!

I'm guessing that it weighs around the 8 or 9kg mark. Thats a good 4.6kg at least for a weapon. Linear actuator on a lifting arm and you have a bot with an active weapon.

I wouldn't bother putting steel on the top. There aren't many bots that will do much to a 5mm hdpe lid.

[Danjr1]

Re: Unnamed featherweight

I've got the frame together now, next issue I've got is how to firmly attach the rc gear and speedos? Kinda worked out how to secure the battery. Any advice?

[Kenny]

Re: Unnamed featherweight

the double sided UPVC foam tape is very good for that

[craig_colliass]

Re: Unnamed featherweight

This is an area were most people rush and then have failures when the robot is in the arena.

If you can form a box that is part of the robot (say fit a thin plastic bulkhead parallel to a bulkhead you already have) and line it with foam so the electronics can be shock proofed (the Rx antenna won't get ripped off by the wheels!!) you will find the better these things are fitted the longer they will last.

robots stop working because wires get trapped or something gets loose or something preventable has happened,
think what if this happens and try to minimise risk

The Saint because of the way it thrashes around should be very unreliable, but isn't because of the thought that has gone into making the parts fit well.

So take your time and get this part right in the end it pays

[swanaldo]

Re: Unnamed featherweight

wise words

[typhoon_driver]

Re: Unnamed featherweight

cable ties. Big ones work well for me

[Danjr1]

Re: Unnamed featherweight

chassis complete! electrics and lids to go

[calumco]

Re: Unnamed featherweight

looking nice, you'd have space inbetween the motors for an actuator or something later on aswell

[Danjr1]

Re: Unnamed featherweight

I'll prob go for 2 spikes on the front for the moment but I always envisaged it having dual spinners, but the engineering may get cramped and complicated for that

[death robotics]

Re: Unnamed featherweight

I'll prob go for 2 spikes on the front for the moment but I always envisaged it having dual spinners, but the engineering may get cramped and complicated for that

Dual spinners would look great but be a nightmare to work on.

You could do a hinged wedge on both side. Hinged in the middle so if flipped over it can flop over and still work as a
wedge :P

[typhoon_driver]

Re: Unnamed featherweight

dual spinners wouldn't be particularly hard to work on, just a waste of potential. Far better taking a single wider lump of metal and spinning it up to speed than two smaller ones. If you don't believe me then do the basic kinetic energy calculations and it soon becomes obvious.

[Danjr1]

Re: Unnamed featherweight

all built and running now. just the testing issues to sort!