Wednesday, October 24, 2007

To-Do List

I find it helpful to write down all the things I need to accomplish from time to time just to wrap my head around what's coming and to sort out the places I need to understand better. This includes what needs done, as well as any points on how to do it that I've thought of.

Things I need to do in order to get the maintube, HT, and BB brazed up. (I'll do rear fork and finishing steps, seat mounting, sprint stays, etc. later)

  • Level jig on saw horses
  • Decide if I am brazing FD mount along with everything else or later separately, and what size tubing I'm using for it.
    • machine appropriate spacer blocks
    • figure out how to miter the thing.
  • Prepare jig
    • Draw out maintube, head tube and BB locations on jig (FD mount?)
    • mount spacer blocks
    • machine wooden square blocks for angle alignment brackets and mount
    • Drill and prepare for BB fixing bolt
  • Mark out maintube
    • Mark 90 deg longitudinal lines on maintube
    • Mark intersections for headtube, BB, and seat mounting penetrations
    • Print out tube miters for HT and BB penetrations, align with longitudinal lines, transfer to tube with centerpunch and marker.
  • Prepare HT
    • Use cutoff tool on lathe to cut partway through tube to mark accurate square cutoff for cutting to length later with hacksaw/file (post brazing)
    • drill breather holes
    • mark intersection with maintube for positioning purposes
  • Cut maintube
    • Cut out headtube penetration.
      • start with dremel
      • clean up to marked line with 1" drum in die grinder
      • Test fit in jig, wash rinse repeat
    • Cut out BB penetration
      • hacksaw lower bevel & rough out
      • finish with 10" half round file and 1" drum
      • Test fit
  • Cut and fit plate for lower bevel under BB
  • Cut and fit FD mount
  • Drill holes for seat mount
    • This is important to do before any brazing since I am doing it on the mill and any brazing material could throw it off depending on exactly how I mount it
  • Mount HT, BB, lower bevel plate in jig.
  • spot braze LH side of headtube, and Top and Bottom of BB (braze both LBP and BB )
  • Take frame out of jig and flip over
  • remount (if this is hard, something warped)
  • braze RH side of ht
  • take frame out of jig, mount in frame stand and finish braze all joints.
  • aligning and brazing seat mounts: (assuming working on LH side)
    • start by running a SS bolt all the way through from the RH side of the frame so that the nuts are tight but it only contacts the first couple threads on the LH nut
    • mount a piece of AL flat stock to the LH nut using a short bolt
    • sight along the maintube and ensure that the flat stock is parallel with HT, also measure with square.
    • adjust as needed
    • carefully remove flat stock without shifting nut
    • braze in nut
    • repeat for other side

No comments: