View Single Post
  #2   Spotlight this post!  
Unread 24-06-2002, 01:45
archiver archiver is offline
Forum Archival System
#0047 (ChiefDelphi)
 
Join Date: May 2001
Location: Pontiac, MI
Posts: 21,214
archiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond repute
300 tooth HOT sprocket...

Posted by Jim Meyer at 03/05/2001 2:30 PM EST


Engineer on team #67, HOT Team, from Huron Valley Schools and GM Milford Proving Ground.


In Reply to: Chief Delphi sprockets
Posted by Patrick Dingle on 03/04/2001 9:41 PM EST:



I can't speak for the Chief, but we machined 300 tooth 1/4 pitch sprokets from lexan for the HOT Bot last year. In case you don't want to do the math, it's around a 2 food diameter sprocket. Both the Marks Standard for Mechanical Engineers and the Machinists Handbook have tooth profiles for roller chain sprockets. If I remember correctly there are only 3 tangent circles that make the tooth profile. The rest is simply a loop rotate on a CNC mill.

A similar method can be used to make gear theeth but they have to a large pitch so you can use a reasonably sized endmill. You can machine smaller pitch gears by buying specially designed cutters.

Hope this helps,

Jim


__________________
This message was archived from an earlier forum system. Some information may have been left out. Start new discussion in the current forums, and refer back to these threads when necessary.