- Joined
- Nov 16, 2015
- Messages
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- Reaction score
- 7
Here is my entry to 2017 WBO.
I'm building it as i wanted a new school cruiser built from materials with a higher strength to weight ratio.
I love old school cruisers, but they could use a little weight saving.
This frame will be built with 4130 Cromoly steel. not the lightest bike of all time, but a step forward from the traditional high carbon steel.
The frame building process will be under the guidance of mountain bike hall of famer, legendary frame builder Paul Brodie.
1st is to design the bike in BikeCad.
Then full scale drawing
cutting and mitering tubes
will be brazing instead of TIG welding. Flux is applied before using oxy-acetylene.
putting things in the jig. Jig was made by Paul Brodie himself 20 some years ago.
Notice how each joint is numbered on specific locations. when the tacks and welds are done in that particular order, the deformation is minimal and the least amount of alignment is required.
tacked and out of the jig for welding
Alignment table
More alignments
Facing the head tube
Front triangle complete
Working on chainstays
another jig used for chainstays
TIG is used to tack all tubes into place before brazing is used to complete everything
More alignments
Facing and chasing the BB
reaming of the seattube
And more alignments
The beauty of fillet brazing is that you sand down all the welds after, so the curves are real nice
Complete frame. I have no idea why these photos are sideways or upside down.
Another photo of the frame building course. There were hundreds of things I could have done wrong. Paul corrected all my mistakes.
Frame sent to media blasting. Paint is next.
To be continued...
I'm building it as i wanted a new school cruiser built from materials with a higher strength to weight ratio.
I love old school cruisers, but they could use a little weight saving.
This frame will be built with 4130 Cromoly steel. not the lightest bike of all time, but a step forward from the traditional high carbon steel.
The frame building process will be under the guidance of mountain bike hall of famer, legendary frame builder Paul Brodie.
1st is to design the bike in BikeCad.
Then full scale drawing
cutting and mitering tubes
will be brazing instead of TIG welding. Flux is applied before using oxy-acetylene.
putting things in the jig. Jig was made by Paul Brodie himself 20 some years ago.
Notice how each joint is numbered on specific locations. when the tacks and welds are done in that particular order, the deformation is minimal and the least amount of alignment is required.
tacked and out of the jig for welding
Alignment table
More alignments
Facing the head tube
Front triangle complete
Working on chainstays
another jig used for chainstays
TIG is used to tack all tubes into place before brazing is used to complete everything
More alignments
Facing and chasing the BB
reaming of the seattube
And more alignments
The beauty of fillet brazing is that you sand down all the welds after, so the curves are real nice
Complete frame. I have no idea why these photos are sideways or upside down.
Another photo of the frame building course. There were hundreds of things I could have done wrong. Paul corrected all my mistakes.
Frame sent to media blasting. Paint is next.
To be continued...
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