Go to Post i feel lost without build season...like i should be somewhere working on something instead of sitting in my basement on my computer... - Wildcat [more]
Home
Go Back   Chief Delphi > FIRST > General Forum
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
  #17   Spotlight this post!  
Unread 03-02-2014, 16:00
Oblarg Oblarg is offline
Registered User
AKA: Eli Barnett
FRC #0449 (The Blair Robot Project)
Team Role: Mentor
 
Join Date: Mar 2009
Rookie Year: 2008
Location: Philadelphia, PA
Posts: 1,116
Oblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond repute
Re: Help: Torque to Linear force conversion

Quote:
Originally Posted by pfreivald View Post
Yeah, I'd love to see it.
Here's a picture of the ratchet. You can see two severely gouged teeth, and these are on the lighter side of the damage we saw that year (we regularly rotated/swapped out ratchets as the teeth became useless). The pawl, too, took a beating in that mechanism, but I don't have it to show as it appears to have been lost.

http://imgur.com/8kZIYzK

To give a reference for the amount of force we were using on this thing, here's a shot where you can make out two of the (very heavy-duty) springs we used to power it:

http://www.flickr.com/photos/robotproject/5049734546/

In this picture it is set up for half-power, our full-power setup used four springs.

Quote:
Originally Posted by Dan.Tyler View Post
Relieve the load on the teeth before releasing the pawl.

You designed to have enough power to pull it back? Pull it back a half tooth more while disengaging the pawl.

Similarly, if using a dog gear method... Drive the motor forward and backdrive while pulling the dog.
Alas, we could not do this as we used the same motor to both tension and release our ratchet.
__________________
"Mmmmm, chain grease and aluminum shavings..."
"The breakfast of champions!"

Member, FRC Team 449: 2007-2010
Drive Mechanics Lead, FRC Team 449: 2009-2010
Alumnus/Technical Mentor, FRC Team 449: 2010-Present
Lead Technical Mentor, FRC Team 4464: 2012-2015
Technical Mentor, FRC Team 5830: 2015-2016

Last edited by Oblarg : 03-02-2014 at 16:10.
Reply With Quote
 


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


All times are GMT -5. The time now is 15:53.

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