I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are here: http://www.flickr.com/photos/timintheshed/sets/72157594509257998/
Riding it theother night, I noticed the joint has sprung again.
Bugger.
Any Pedersen owners out there with a clue as to what's going on?
--
Tim
I understand very little of what's being discussed but for some reason it's fascinating.
I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are here: http://www.flickr.com/photos/timintheshed/sets/72157594509257998/
Riding it theother night, I noticed the joint has sprung again.
Bugger.
Any Pedersen owners out there with a clue as to what's going on?
I'd be looking at the other joints, starting with the ones closest. If they are bad you could get that one failing as it tries to take more than it was supposed to.
Plastic coating will be trouble though - it probably will be flexible enough that you won't see cracking. What did that cost?
In article <[email hidden]>, Tim Hall [email hidden] says...
Quoted message said:
I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are here: http://www.flickr.com/photos/timintheshed/sets/72157594509257998/
Riding it theother night, I noticed the joint has sprung again.
Bugger.
Any Pedersen owners out there with a clue as to what's going on?
I wonder if a vent hole is blocked (or missing) so the bronze didn't fill the joint properly. Probably unlikely, as this is normally evident when you make the joint. It could be that there was some corrosion or contamination to the end of the bridge tube that didn't get cleaned off before the joint was remade - it would be trickier to get in there than to clean the main strut. I think you really need to take the bridge out and examine the surfaces of the joint to get some indication of what's going on, rather than just trying to rebraze it in situ and hoping for the best.
In article <[email hidden]>, _ [email hidden] says...
Quoted message said:
Tim Hall said:
I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are here: http://www.flickr.com/photos/timintheshed/sets/72157594509257998/
Riding it theother night, I noticed the joint has sprung again.
Bugger.
Any Pedersen owners out there with a clue as to what's going on?
I'd be looking at the other joints, starting with the ones closest. If they are bad you could get that one failing as it tries to take more than it was supposed to.
Plastic coating will be trouble though - it probably will be flexible enough that you won't see cracking.
All he has to do is remove the seat posts and wiggle the seat tubes for any other fracture to become apparent, but as the only other joints are where the seat tubes join the bottom bracket[1] I don't think anything will show up. It's notable that on the original Pedersens the two seat tubes were joined at the top, thus triangulating them - I wonder if the provision of separate adjustable seat posts has compromised the rigidity of the structure, subjecting the bridge in question (which originally just held the seat tubes apart) to too much (mostly shear) stress. If that's the case I'd be inclined to braze a plate or crossed tubular bridges between the seat tubes near the top (not very pretty, but should work) to control the movement, or replace the failed bridge with such an arrangement (maybe neater but it would place more stress on the seat tubes).
[1] I'm assuming the front mech mount is just a bolt-on.
I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are here: http://www.flickr.com/photos/timintheshed/sets/72157594509257998/
Riding it theother night, I noticed the joint has sprung again.
Bugger.
Any Pedersen owners out there with a clue as to what's going on?
Which has that detail on them as well as Sakae custom on the other side, which is the brand i guess. Is the Pederesen from the 80's? i've dated my old racer to 1986 from the suntour's derailer stamps. though i have no idea what the bike is it's self as it has a rather funky paint job at some point.
google doesn't seem to bring up much or rather much useful any way.
I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are here: http://www.flickr.com/photos/timintheshed/sets/72157594509257998/
Riding it theother night, I noticed the joint has sprung again.
Bugger.
Any Pedersen owners out there with a clue as to what's going on?
Which has that detail on them as well as Sakae custom on the other side, which is the brand i guess. Is the Pederesen from the 80's? i've dated my old racer to 1986 from the suntour's derailer stamps. though i have no idea what the bike is it's self as it has a rather funky paint job at some point.
Quoted message said:
google doesn't seem to bring up much or rather much useful any way.
Quoted message said:
roger
I wonder if the stress on the joint coud be relieved by fasioning a brace between the seat tubes to hold them RIGID.
In article <[email hidden]>, _ [email hidden] says...
Quoted message said:
Tim Hall said:
I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are here: http://www.flickr.com/photos/timintheshed/sets/72157594509257998/
Riding it theother night, I noticed the joint has sprung again.
Any Pedersen owners out there with a clue as to what's going on?
I'd be looking at the other joints, starting with the ones closest.
Quoted message said:
All he has to do is remove the seat posts and wiggle the seat tubes for any other fracture to become apparent, but as the only other joints are where the seat tubes join the bottom bracket[1] I don't think anything will show up. It's notable that on the original Pedersens the two seat tubes were joined at the top, thus triangulating them - I wonder if the provision of separate adjustable seat posts has compromised the rigidity of the structure, subjecting the bridge in question (which originally just held the seat tubes apart) to too much (mostly shear) stress. If that's the case I'd be inclined to braze a plate or crossed tubular bridges between the seat tubes near the top (not very pretty, but should work) to control the movement, or replace the failed bridge with such an arrangement (maybe neater but it would place more stress on the seat tubes).
Hmm. Looking at it from an intuitive persecrtive I would think that joining the seat tubes rather more robustly at their ends is a Good Idea [TM] The loading on the bridge from the riding motion must be beyond it. -- Phil Cook looking north over the park to the "Westminster Gasworks"
I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are here: http://www.flickr.com/photos/timintheshed/sets/72157594509257998/
I have a secret yearning for one of those. I must resist...
