User Tag List

Results 1 to 4 of 4

Thread: Seatstay mitre angle

  1. #1
    Join Date
    Oct 2013
    Posts
    16
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Seatstay mitre angle

    Hi everyone,

    This one has been stumping me for a while now.

    I use a fixture that holds my seatstays at the correct angle from each other and then setup my mill to cut the seat tube mitre into them. I measure the SS/ST angle off a full scale drawing then adjust my mill accordingly. For example, if I measure a 46.4 degree angle, I'll set the mill angle to 36 degrees and adjust my fixture by the remaining 10.4 to get to 46.4 degrees. I double check my angle on the drawing, then my mill and then my fixture. It's all good. When I take the SS's back to fit onto the frame, they're off. BY nearly 10 DEGREES! I can't figure out why they're off.

    Does anyone know what is going on? I've tried keeping the fixture level and setting the mill to the full 46.4 degrees and that doesn't make a difference. I have some experience framing homes and I know that angles in hips and valleys get screwy when sheeting roofs - is that what's going on here?

    Now I know why I should have paid more attention in math class in HS.

    Thanks,

    Lyle Wiens
     

  2. #2
    Join Date
    Jun 2008
    Posts
    3,374
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Seatstay mitre angle

    At 46.4* I'm guessing you got this from the acute side(SS to ST)? but you are attacking the cut from the obtuse?

    If this is the case set your cut to 43.6* (90-46.4=43.6)
    Nick Crumpton
    crumptoncycles.com
    Instagram
    "Tradition is a guide, not a jailer" óJustin Robinson

  3. #3
    Join Date
    Oct 2013
    Posts
    16
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Seatstay mitre angle

    Thanks Nick! I think you're on to something.

    Lyle Wiens
     

  4. #4
    Join Date
    Jun 2008
    Posts
    3,374
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Seatstay mitre angle

    Hey, I'm only following. It was Euclid that was on to something...
    Nick Crumpton
    crumptoncycles.com
    Instagram
    "Tradition is a guide, not a jailer" óJustin Robinson

Similar Threads

  1. Fixing 70's Schwinn seatstay braze
    By andyreagan in forum The Path
    Replies: 3
    Last Post: 09-26-2012, 04:17 PM
  2. Seatstay attachments continued...
    By suhacycles in forum The Path
    Replies: 10
    Last Post: 05-19-2010, 10:41 AM
  3. Seatstay reinforcers?
    By suhacycles in forum The Path
    Replies: 14
    Last Post: 03-18-2010, 10:17 PM

Tags for this Thread

Bookmarks

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
  •