cracked aluminum frame
Moderator: robbosmans
I've attached a pic of an old standby aluminum frame that got a crack on the seat lug. My view is that I should cut the lug off, drill a new stress releaver hole at the back of the seattube, slot the tube and use a collar. I suppose it might be possible to weld the lug/rub shut, but I think this will entail higher expense, along with a possibility of the crack reopening later.
Any alternative ideas?
Any alternative ideas?
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Your method sounds like a good option & will likely be fine
I guess the only question is that the remaining section is fairly short & close to a big weld
so might not flex enough when clamped to tighten. But if you slot as you say I imagine it would.
I guess the only question is that the remaining section is fairly short & close to a big weld
so might not flex enough when clamped to tighten. But if you slot as you say I imagine it would.
I would do as you propose.
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Before cutting I'd probably try to dremel away the ears and clean up the seat tube. Then I'd try to fit a clamp over it. If there is a big tube piece missing I'd try to fit something there.
The reasons for this are:
1. weak clamping force near a huge weld
2. hard to find clamps that are the right diameter and can provide enough clamping force to hold the seat tube
3. it looks better (personal) when the clamp isn't slammed
The reasons for this are:
1. weak clamping force near a huge weld
2. hard to find clamps that are the right diameter and can provide enough clamping force to hold the seat tube
3. it looks better (personal) when the clamp isn't slammed
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Great advice. I would also add that it would be wise to lengthen the relief slot and include a new hole at the end of it. I've experienced a similar issue and this slot length increasement solved the cracking problem so well that the manufacturer adopted the modification.alcatraz wrote: ↑Mon May 28, 2018 3:58 pmBefore cutting I'd probably try to dremel away the ears and clean up the seat tube. Then I'd try to fit a clamp over it. If there is a big tube piece missing I'd try to fit something there.
The reasons for this are:
1. weak clamping force near a huge weld
2. hard to find clamps that are the right diameter and can provide enough clamping force to hold the seat tube
3. it looks better (personal) when the clamp isn't slammed