How do you mate an existing rack with new gear
Close
Login to Your Account
Results 1 to 7 of 7
  1. #1
    Join Date
    Jul 2011
    Location
    California
    Posts
    128
    Post Thanks / Like
    Likes (Given)
    120
    Likes (Received)
    50

    Default How do you mate an existing rack with new gear

    I need to purchase a gear that fits an existing rack. The pitch of the rack is .250. How does that number relate to a pinion gear where the gear pitch is listed in much larger numbers such as 8,10,12?
    Thanks

  2. #2
    Join Date
    Jul 2004
    Location
    Houston, TX USA
    Posts
    29,481
    Post Thanks / Like

    Default

    Divide the DP into "pi"

    3.14159 / 8 = .3926" circular pitch

    Nearer what you want is 12 DP

    3.14159 / 12 = .261"

    When you say .250 pitch that means .250 from one tooth to the same point on the next tooth

    See the "P" in the thumbnail (thanks to the Boston Gear page)
    Attached Thumbnails Attached Thumbnails pitch-rack.jpg  

  3. Likes gwbolton liked this post
  4. #3
    Join Date
    Jul 2011
    Location
    California
    Posts
    128
    Post Thanks / Like
    Likes (Given)
    120
    Likes (Received)
    50

    Default

    Got it. Thanks John!

  5. #4
    Join Date
    Jan 2007
    Location
    Norfolk, UK
    Posts
    18,585
    Post Thanks / Like
    Likes (Given)
    14127
    Likes (Received)
    14094

    Default

    Of course if the rack pitch is .250 from tooth to tooth (as per Johns drawing), then you need a .250'' Circular Pitch (CP) mating gear

  6. Likes Erich, gwbolton, sfriedberg liked this post
  7. #5
    Join Date
    Jul 2011
    Location
    California
    Posts
    128
    Post Thanks / Like
    Likes (Given)
    120
    Likes (Received)
    50

    Default

    Thanks Limy
    You are from a beautiful part of the country. I remember as a young lad, camping with the family in the lovely countryside. Norfolk Downs I think it was called.
    Garry (ex Dundee)

  8. #6
    Join Date
    Jan 2007
    Location
    Norfolk, UK
    Posts
    18,585
    Post Thanks / Like
    Likes (Given)
    14127
    Likes (Received)
    14094

    Default

    Probably the Wiveton Downs Wiveton Downs - Wikipedia ….but all along the Cromer Ridge Cromer Ridge - Wikipedia is nice.

    I live just a little inland in Briston Briston - Wikipedia

    And yep, this part of Norfolk is lovely, …..and my little bit of heaven since 1982

  9. Likes gwbolton liked this post
  10. #7
    Join Date
    Mar 2009
    Location
    Brunswick Oh USA
    Posts
    4,492
    Post Thanks / Like
    Likes (Given)
    4964
    Likes (Received)
    2676

    Default

    Quote Originally Posted by Limy Sami View Post
    Probably the Wiveton Downs Wiveton Downs - Wikipedia ….but all along the Cromer Ridge Cromer Ridge - Wikipedia is nice.

    I live just a little inland in Briston Briston - Wikipedia

    And yep, this part of Norfolk is lovely, …..and my little bit of heaven since 1982
    Sami,
    PM sent.


Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •