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Step 8The frame (2)
The frame needs some more strengthening.
The next step is to join a new piece of steel tube from the bottom bracket shell to the top tubes. This will replace the seat tube which is now towards the back of the frame.
Picture 1. Using the same trick of making a cardboard template, I made a steel sheet plate and welded it to a new piece of steel tubing. It took several attempts to get the angle correct, so use a small tack weld and be prepared to break / grind / re-weld.
Be careful with the length of the tube - if it's too long, it will hit the bottom bracket axle. Make sure the tube fits into the bottom bracket shell, but not too far in.
Picture 2 shows the frame, fully welded.
The next step is to join a new piece of steel tube from the bottom bracket shell to the top tubes. This will replace the seat tube which is now towards the back of the frame.
Picture 1. Using the same trick of making a cardboard template, I made a steel sheet plate and welded it to a new piece of steel tubing. It took several attempts to get the angle correct, so use a small tack weld and be prepared to break / grind / re-weld.
Be careful with the length of the tube - if it's too long, it will hit the bottom bracket axle. Make sure the tube fits into the bottom bracket shell, but not too far in.
Picture 2 shows the frame, fully welded.
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