www.robowars.org

RoboWars Australia Forum Index -> General Chatter

just wondering
Goto page 1, 2, 3 ... 168, 169, 170  Next

Post new topic   Reply to topic
  Author    Thread
Big AL
Experienced Roboteer


Joined: 16 Oct 2004
Posts: 436
Location: roleystone perth. WA


 Reply with quote  
just wondering

what would be good for armor plating i was thinking ali but i'v been reading people are using ti for plateing but i'v found it is a little expencive.

also would a wind screen washer moter be good for a spinner drive?

also (again Rolling Eyes ) are drill moters good for wheel drives ?

also any hint would be great
_________________
For West ausies interested in robotics email me at: theoneshrug@hotmail.com
OR
dragoonarie@gmail.com
best quote ever:: "Those Gas-Turbine style warehouse heaters arent illegal, and neither is remote controlling one as far as I know."

Post Sun Oct 31, 2004 12:26 am 
 View user's profile Send private message MSN Messenger
Knightrous
Site Admin


Joined: 15 Jun 2004
Posts: 8469
Location: NSW


 Reply with quote  

Okay, I don't mean to be grouchy at you Al, but most of your questions have already been answered in existing threads. Please check threads before creating new ones.

Okay. Here were go:

Armour materials are a pickle in a half. for your first robot, Aluminium will be easy to work with, and will provide a good learning experince.

Windscreen Wiper Motors are very slow with the gearbox on, for a spinner, you would be better off with a fan motor from a car.

Drill motors are in 95% of the robots in Australia. They are cheap to get, cheap to replace and do a mighty job for the price.
_________________
RoboWars Sydney 2013 Sportsman Champion - Farmboy

Post Sun Oct 31, 2004 12:30 am 
 View user's profile Send private message Visit poster's website
Big AL
Experienced Roboteer


Joined: 16 Oct 2004
Posts: 436
Location: roleystone perth. WA


 Reply with quote  

fair enough team vertex i bet you probable sick of newbis constently asking you these questions Smile
_________________
For West ausies interested in robotics email me at: theoneshrug@hotmail.com
OR
dragoonarie@gmail.com
best quote ever:: "Those Gas-Turbine style warehouse heaters arent illegal, and neither is remote controlling one as far as I know."

Post Sun Oct 31, 2004 12:58 am 
 View user's profile Send private message MSN Messenger
Knightrous
Site Admin


Joined: 15 Jun 2004
Posts: 8469
Location: NSW


 Reply with quote  

I don't mind helping at all, just sometimes, it gets a little annoying when the answers are in active threads and newbies just dive in head first creating threads with out looking Wink

Do you have any more questions while your at it?
_________________
RoboWars Sydney 2013 Sportsman Champion - Farmboy

Post Sun Oct 31, 2004 1:02 am 
 View user's profile Send private message Visit poster's website
3Faze



Joined: 26 Jun 2004
Posts: 99
Location: Lincolnshire, UK


 Reply with quote  

Polypropylene (it's a lightweight engineering plastic)

No

They're ok

Post Sun Oct 31, 2004 3:13 am 
 View user's profile Send private message
Windhammer



Joined: 19 Jun 2004
Posts: 338
Location: Roleystone WA


 Reply with quote  

i told him to look through all the treads before creating new one at skool but he didnt listern to me. Rolling Eyes

Alex get some msn address from the member list and ask them question on there.

Post Sun Oct 31, 2004 11:27 am 
 View user's profile Send private message Send e-mail MSN Messenger
chris



Joined: 18 Jun 2004
Posts: 160
Location: Brisbane


 Reply with quote  

it doesnt matter where you start just as long as you do!
My first finished robot, Spiny Tiger, was made entirely out of wood Very Happy
Although I am embarrassed saying that I built it I look back on it and can honestly say that it gave me the confidence to keep going.
the lesson learnt here is you can compete on a budget!!!
_________________
Mr "squirt"
Team Blazing Star

Post Mon Nov 01, 2004 7:15 pm 
 View user's profile Send private message Send e-mail MSN Messenger
Glen
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 9467
Location: Where you least expect


 Reply with quote  

amen to that chris, i cant say my first 3 attempts where really any better. even worse actually.

the idea is to get building and teach yourself. i just dont think you can be told somethings. example, you cant tell someone how to weld on a forum and expect them to do a perfect weld first time off.
_________________
www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz

Post Mon Nov 01, 2004 7:22 pm 
 View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
Waddy the phoenix



Joined: 16 Jun 2004
Posts: 971
Location: sydney


 Reply with quote  

LOL yeah chris i know exactaly what you meen and glen i think mine was the worst by far on crappy firsts. take the prototype for ts it was timber base and a back panel with a spike out the back and no side or wedge LOL Embarassed but then again it never fought in any battle but a hint either way try and keep it aslow in hight as possible because you can have timber armor and be realy effective but the bots with their spinny bars and their kinetic weopons are generally up high so if you keep it low you can still compeet against em plan b is probably the only exception to this rule in australia
_________________
as a shadow is seen and not heard i am here
-Waddy the phoenix

Post Mon Nov 01, 2004 8:24 pm 
 View user's profile Send private message MSN Messenger
timmeh
Experienced Roboteer


Joined: 20 Jul 2004
Posts: 2517
Location: Victoria


 Reply with quote  

Just wondering

is this right?

if my motor is 6000 rpm and my gear ratio is 10-1 and my wheel is 10inches do i get 28.4 kph?
_________________
Tim Team Reaper.

Post Sat Nov 27, 2004 1:05 pm 
 View user's profile Send private message Send e-mail
Spockie-Tech
Site Admin


Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia


 Reply with quote  

step 1 - 6000 revolutions per minute * 60 minutes per hour = 360,000 revolutions per hour.

Step 2 - Divide Motor Rpm / Gear Ratio (10:1 = /10) = 36,000 wheel revs per hour

step 3 - 10 inches wheel diamter = 25.4 cm wheel diameter
(please keep units constant, dont work with tyre diameter in inches (imperial) but ask for speed in metric (kilometers)

step 4 - 25.4cm diameter * Pi (3.1415) = 79.79cm circumference (Circ = Pi *D)

Step 5 - 36,000 revolutions per hour * 79.79cm circumference = 2,872,440 cenitmeters per hour

Step 5 - didive 2,872,,440 by 100 (centimeters to meters), and again by 1000 (meters to KiloMeters) = 28.724 KiloMeters per hour.

So, Approximately.. Yes, looks like you got your maths right, well done.


Thats not taking into account wind resistance, drive train gear losses, battery voltage drop, Thermal heating of wires increasing circuit resistance, tyre diameter growth due to rotational forces, inertial acceleration factors, the friction coefficients and drag of the tires, and several thousand other factors that may invalidate the accuracy of these calculations..

(ask a simple question that has been explained before, get a deliberately over-complicated answer.. Razz )
_________________
Great minds discuss ideas. Average minds discuss events. Small minds discuss people

Post Sat Nov 27, 2004 5:45 pm 
 View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
timmeh
Experienced Roboteer


Joined: 20 Jul 2004
Posts: 2517
Location: Victoria


 Reply with quote  

Well to be honnest i used a calculator i found on a web site Smile

But when it came up 28kph at a 10-1 gear ratio i thought hmm that sounds a little fast.
_________________
Tim Team Reaper.

Post Sun Nov 28, 2004 12:52 pm 
 View user's profile Send private message Send e-mail
kkeerroo
Experienced Roboteer


Joined: 17 Jun 2004
Posts: 1459
Location: Brisbane


 Reply with quote  

I was just flicking though a book of engineering calculations in a shop yesterday when this caught my eye. Aparently the book claimed the stored energy in a flywheel is calculated by:

KE = (v^2 * m) / (2g)

It also stats the answers comes out in Nm.

Now for a book the costs $250 this seems rather sad. For one thing energy is Joules, not Newton Meters. Second, no matter where you stick a Gravational Constant will give you that result. The units I figured out from the calculation are:
kg.m

Which isn't a reconized unit as far as I can see.


So I'm wondering am I wrong or is the book wrong?
_________________
Get Some!!!

Secretary of the Queensland Robotics Sports Club inc.

Post Sun Nov 28, 2004 1:21 pm 
 View user's profile Send private message Send e-mail Yahoo Messenger MSN Messenger
Waddy the phoenix



Joined: 16 Jun 2004
Posts: 971
Location: sydney


 Reply with quote  

the book is prolly wrong its probably writan by some one that has a half assed education. this is what i would do.

get the authors name stick that in google and see what comes up if nothing than its almost definatly the book if it comes up with a web page about him or any thing than search for more search able material and keep searching to see if there is any gaps in the story

lol reading over it it makes me sound like im one of those people scearch for conspericies lol
_________________
as a shadow is seen and not heard i am here
-Waddy the phoenix

Post Sun Nov 28, 2004 1:46 pm 
 View user's profile Send private message MSN Messenger
kkeerroo
Experienced Roboteer


Joined: 17 Jun 2004
Posts: 1459
Location: Brisbane


 Reply with quote  

Nope. I trust the Authors. There were 10 of them for that chapter and 7 of them had PHD's in mechanical engineering.

But who cares about energy equations. Scarifiers 14 Joules pick did more damage to our VCR then The Aggressors 800 Joule Bike Wheels.

Theroy is one thing, Parctice is another.
_________________
Get Some!!!

Secretary of the Queensland Robotics Sports Club inc.

Post Sun Nov 28, 2004 5:49 pm 
 View user's profile Send private message Send e-mail Yahoo Messenger MSN Messenger
  Display posts from previous:      

Forum Jump:
Jump to:  

Post new topic   Reply to topic
Page 1 of 170

Goto page 1, 2, 3 ... 168, 169, 170  Next

Forum Rules:
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

 

Last Thread | Next Thread  >
Powered by phpBB: © 2001 phpBB Group
millenniumFalcon Template By Vereor.