Go to Post the few, the proud, the animators. - BuddyB309 [more]
Home
Go Back   Chief Delphi > Technical > Pneumatics
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #14   Spotlight this post!  
Unread 11-01-2006, 09:47
sciguy125 sciguy125 is offline
Electrical Engineer
AKA: Phil Baltar
FRC #1351
Team Role: College Student
 
Join Date: Jan 2005
Rookie Year: 2004
Location: Sunnyvale, CA
Posts: 519
sciguy125 has a reputation beyond reputesciguy125 has a reputation beyond reputesciguy125 has a reputation beyond reputesciguy125 has a reputation beyond reputesciguy125 has a reputation beyond reputesciguy125 has a reputation beyond reputesciguy125 has a reputation beyond reputesciguy125 has a reputation beyond reputesciguy125 has a reputation beyond reputesciguy125 has a reputation beyond reputesciguy125 has a reputation beyond repute
Send a message via AIM to sciguy125 Send a message via MSN to sciguy125 Send a message via Yahoo to sciguy125
Re: pneumatic launch velocity

Quote:
Originally Posted by KenWittlief
using F=M*A and V=A*t my calculations indicate you only need 19 lbs of force over a distance of 6" to accelerate a 0.175 kg ball up to 12m/s

the acceleration is 480M/S^2, and the time to get from 0 to 12m/S is 25mS
There's something wrong here. All the equations make sense. However, the solutions that use said equations don't. Actually...nevermind, in the middle of writing this post I found the descrepency.

Ken's solution:
F=ma => a=F/m
19lb = 84.5N
a= 84.5/0.175 = 480m/s^2

V=at => t=V/a
t = 12/480 = 0.025ms

d=0.5at^2
d = 0.5*480*0.000625 = 0.15m = 59"

You missed a decimal place in your conversion from meters to inches.

The problem that I initially found was that 19lb (84N) over a distance of 6" (15cm) only supplies 1.26J. I was surprised I didn't notice that it was exactly 1/10 what it should have been.
__________________

-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GE/S/P a-- e y-- r-- s:++ d+ h! X+++
t++ C+ P+ L++ E W++ w M-- V? PS+ PE+
5- R-- tv+ b+ DI+++ D- G
------END GEEK CODE BLOCK------
 


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Falcon 1 Ready to Launch Friday 11/25 Doug G Chit-Chat 2 26-11-2005 22:04
NASA Schedules Robotic Spacecraft Launch Mirza95vx General Forum 2 07-04-2005 00:33
Pneumatic Wheels Steve P Pneumatics 4 07-02-2005 15:16
Pneumatic Gripper ruling Nitroxextreme Pneumatics 7 30-01-2005 13:04
Who has used pneumatic wheels? chellyzee93 Kit & Additional Hardware 3 16-02-2003 11:49


All times are GMT -5. The time now is 01:05.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi