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
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