Go to Post of course, like anything, there is big difference between "can" and "should" - ratdude747 [more]
Home
Go Back   Chief Delphi > Technical > Technical Discussion
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
  #3   Spotlight this post!  
Unread 21-01-2002, 18:08
ChrisH's Avatar Unsung FIRST Hero
ChrisH ChrisH is offline
Generally Useless
FRC #0330 (Beach 'Bots)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1998
Location: Hermosa Beach, CA
Posts: 1,230
ChrisH has a reputation beyond reputeChrisH has a reputation beyond reputeChrisH has a reputation beyond reputeChrisH has a reputation beyond reputeChrisH has a reputation beyond reputeChrisH has a reputation beyond reputeChrisH has a reputation beyond reputeChrisH has a reputation beyond reputeChrisH has a reputation beyond reputeChrisH has a reputation beyond reputeChrisH has a reputation beyond repute
Not that I'm an expert but...

Quote:
Are the gears supposed to turn on a fixed shaft or do you attatch them to a rotating shaft and support that shaft with bearings?
The answer is BOTH. Which approach you use depends on the rotational speeds and loads of your gear train. It also depends on the sizes of gears and shafts involved. It can be kind of hard finding ball bearings to mount your 32 pitch 16 tooth gear on a 1/4" dia shaft. Though a journal bearing might work well. Especially if it is made from the gear itself.

You also asked about galling and heating. Neither should be a problem in a properly designed set-up. But it is the proper design you're probably asking about. Fits also depend on the diameters of the shafts involved.

I think your post ID'd you as a college student. If so check with an ME prof if you haven't gotten that far in your own course work. If you can find a book called Mechanical Engineering Design by Shigley there is an excellent discussion about this sort of thing and a table of "fits" in the back. For this application I think you want a "running" fit.

BTW galling can mostly be prevented by using different materials for the parts of the joint. ie a brass gear on a steel shaft. The important thing is to have different hardnesses in the pieces that are moving relative to one another. Though proper lubrication doesn't hurt either

Whatever you do, don't put an aluminum gear on an aluminum shaft and expect it to turn.
__________________
Christopher H Husmann, PE

"Who is John Galt?"
 


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
gear boxes BoticsPUNK General Forum 6 24-01-2003 20:35
Thunder Chicken CCT Simon G Motors 4 03-01-2003 13:18
FISHER PRICE GEAR BOXES archiver 1999 2 23-06-2002 22:07
Drivetrain help thedillybar Technical Discussion 9 08-01-2002 21:54
Drivetrain Help Jordan Technical Discussion 16 02-12-2001 12:14


All times are GMT -5. The time now is 16:09.

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