Did I fork this up?
#1
buy my bikes
Thread Starter
Join Date: Jun 2014
Location: Michigan
Posts: 1,800
Bikes: my very own customized GUNNAR CrossHairs
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 519 Post(s)
Liked 428 Times
in
249 Posts
Did I fork this up?
I’ve been working on a bodge project to change a cantilever brake frame set from 700c to 650b. I removed the canti bosses on the fork. I had some filing to do to clean things up.
i got a bit toooo aggressive/careless and gouged the fork itself.
Almost 1mm deep, about 10mm long.
Let me know if I’ve probably made this 30 year old fork a little less safe, or significantly more less safe.
thanks. (maybe I should stick with just cycling to the coffee shop……😒
i got a bit toooo aggressive/careless and gouged the fork itself.
Almost 1mm deep, about 10mm long.
Let me know if I’ve probably made this 30 year old fork a little less safe, or significantly more less safe.
thanks. (maybe I should stick with just cycling to the coffee shop……😒
Likes For guy153:
#3
Senior Member
Join Date: May 2013
Posts: 55
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Likes: 0
Liked 6 Times
in
5 Posts
Those bosses were tig welded on you are also seeing weld under cutting common with tig joints.
i would not worry too much. As stated above the tubes are thick.
i have removed and moved hundreds of those on mis-spec-ed forks from QBP. They had a thing about ordering them at the wrong height. I found micro fractures around the bosses from the factory over heating while brazing as well as what you are seeing with the weld under cutting.
If the new bosses will be low enough fill with silver. Your bosses can be done in silver too.
i would not worry too much. As stated above the tubes are thick.
i have removed and moved hundreds of those on mis-spec-ed forks from QBP. They had a thing about ordering them at the wrong height. I found micro fractures around the bosses from the factory over heating while brazing as well as what you are seeing with the weld under cutting.
If the new bosses will be low enough fill with silver. Your bosses can be done in silver too.
Likes For pwyg:
#4
buy my bikes
Thread Starter
Join Date: Jun 2014
Location: Michigan
Posts: 1,800
Bikes: my very own customized GUNNAR CrossHairs
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 519 Post(s)
Liked 428 Times
in
249 Posts
Originally Posted by pwyg;[url=tel:22273644
22273644[/url]]Those bosses were tig welded on you are also seeing weld under cutting common with tig joints.
Your bosses can be done in silver too.
Your bosses can be done in silver too.
My plan is to braze silver for the new bosses.
I’ve been shaping the new bosses a bit on my bench grinder to make sure the contours match.
Thanks for the reply.
#5
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,394
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,693 Times
in
2,515 Posts
I recommend buying a nice file and going more slowly next time. Hacksaw only what you can see and leave a little bit to file off.
If it wasn't a cheap fork, you definitely would have ruined it. A good fork blade isn't much thicker than that. There is no reason to leave yourself wondering if it's okay or not. The question will come back to you when you are riding at high speed down a mountain.
If it wasn't a cheap fork, you definitely would have ruined it. A good fork blade isn't much thicker than that. There is no reason to leave yourself wondering if it's okay or not. The question will come back to you when you are riding at high speed down a mountain.
Likes For unterhausen:
#6
buy my bikes
Thread Starter
Join Date: Jun 2014
Location: Michigan
Posts: 1,800
Bikes: my very own customized GUNNAR CrossHairs
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 519 Post(s)
Liked 428 Times
in
249 Posts
I recommend buying a nice file and going more slowly next time. Hacksaw only what you can see and leave a little bit to file off.
If it wasn't a cheap fork, you definitely would have ruined it. A good fork blade isn't much thicker than that. There is no reason to leave yourself wondering if it's okay or not. The question will come back to you when you are riding at high speed down a mountain.
If it wasn't a cheap fork, you definitely would have ruined it. A good fork blade isn't much thicker than that. There is no reason to leave yourself wondering if it's okay or not. The question will come back to you when you are riding at high speed down a mountain.
I inherited about 100 lbs of files from my dad, a millwright. So I was working my way to the finer files.
I was using a very aggressive rasp file to get the boss remnants close the the for blade - and just was not being careful.
The whole '91 Schwinn CrossCut frameset was $40. I'm about 55% sure this is a Chinese frameset. So if I foul the whole thing up the lesson cost of the lesson is not too bad. (it's not going to start getting financially expensive until I start building the wheels.....)
Thanks for the reply.
#7
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,070
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4198 Post(s)
Liked 3,850 Times
in
2,300 Posts
Unfortunately the cost of a failure of a structural part that is supported at one end only (think about this, every other tube in a frame is attached at two ends, but the fork) might be measured by the medical industry... Andy
__________________
AndrewRStewart
AndrewRStewart