Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-10-17, 07:14 PM   #1
yonekura
Junior Member
Thread Starter
 
Join Date: Oct 2012
Bikes:
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Replace Housing Guide

Well today my housing got snagged on a handrail, and the end result was this housing guide broke. it was never strong to begin with since when I got the frame this particular guide was partially crushed.

I have looked online and the braze-ons, and they are not too expensive. However, I don't have an acetylene torch. Can I use propane or mapp gass to braze a new guide onto the frame. I suspect I can't use brass brazing rod with a propane or mapp torch. I just want to fix it without spending too much money. I can get a powder coat for 90 dollars.


Last edited by yonekura; 09-10-17 at 08:42 PM.
yonekura is offline   Reply With Quote
Old 09-10-17, 08:40 PM   #2
Andrew R Stewart 
Andrew R Stewart
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder
Posts: 8,535
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 709 Post(s)
For this small material mass job a torch that's inadequate for BB shells and crowns can be fine, like MAP. I would strongly consider a lower temp filler, like 56% silver brazing rod.


I would consider removing the other not yet broken casing guides and attaching split casing stops. Andy.
Andrew R Stewart is offline   Reply With Quote
Old 09-10-17, 08:47 PM   #3
yonekura
Junior Member
Thread Starter
 
Join Date: Oct 2012
Bikes:
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Quote:
Originally Posted by Andrew R Stewart View Post
For this small material mass job a torch that's inadequate for BB shells and crowns can be fine, like MAP. I would strongly consider a lower temp filler, like 56% silver brazing rod.


I would consider removing the other not yet broken casing guides and attaching split casing stops. Andy.
I actually was curious about what's better guides or stops.
yonekura is offline   Reply With Quote
Old 09-10-17, 08:51 PM   #4
Andrew R Stewart 
Andrew R Stewart
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder
Posts: 8,535
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 709 Post(s)
Quote:
Originally Posted by yonekura View Post
I actually was curious about what's better guides or stops.

I'm a wrench so the design that allows for easy maintenance is the better choice IMO. Andy.
Andrew R Stewart is offline   Reply With Quote
Old 09-10-17, 10:17 PM   #5
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Bikes:
Posts: 15,563
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
I would use a clip unless you were really set on ruining the paint
unterhausen is offline   Reply With Quote
Old 09-10-17, 10:32 PM   #6
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 34,498
Mentioned: 91 Post(s)
Tagged: 1 Thread(s)
Quoted: 3080 Post(s)
Since a housing guide is non structural and has minimal load, I'd consider carefully filing the old one off to not quite flush with the tube. If you're good with a file, you can get as close to flush as you dare, but want to be careful about filing or cutting into the tube. Then shape the back of a replacement to a good fit, and glue it in place with high strength adhesive.

There's no sense in burning the paint with a silver solder repair at this point.

BTW - If you want more strength than you think glue can offer, start the same way, and drill a small hole into the tube. Then drill the back of the replacement, and set a pin, silver soldering it, which is easy enough with MAPP gas on a part this small. Then clean everything up well, and set the replacement using glue.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 09-11-17, 09:30 PM   #7
yonekura
Junior Member
Thread Starter
 
Join Date: Oct 2012
Bikes:
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Well filling off the busted guide means steel is exposed, plus there are a few other rough patches so I am not sure that would be the best course of action.
yonekura is offline   Reply With Quote
Old 09-11-17, 09:37 PM   #8
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Bikes:
Posts: 15,563
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
nuking it with a torch means a whole lot of steel is exposed.

But I have no idea why you would do anything other than use a clip
__________________
Randonneuring -- it's touring for people that aren't smart enough to stop for the night.
It's a wonderful sport when you can make up for a lack of ability with a lack of sleep
unterhausen is offline   Reply With Quote
Old 09-11-17, 09:38 PM   #9
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 34,498
Mentioned: 91 Post(s)
Tagged: 1 Thread(s)
Quoted: 3080 Post(s)
Quote:
Originally Posted by yonekura View Post
Well filling off the busted guide means steel is exposed, plus there are a few other rough patches so I am not sure that would be the best course of action.
You asked about brazing a replacement. How do you propose to do that without first removing the broken one? And how do you expect to braze anything without burning paint and exposing steel?

Either way, you have to get down to a clean tube, ie. debraze, then cool, and clean up with a file in preparation to brazing the replacement. hat's two heating cycles. All I'm suggesting is that you remove the old one with a file instead of heat, then once you're down to the tube (which you are not filing) you can either braze or glue the replacement. Your call.

Off course you might carefully clean up the existing braze on, filing the broken bit to the base. Then buy a new braze on, carefully cut it in half to match what's left of yours and then silver solder the new top to the old base.

That's possible, but it's delicate jewelry maker's work, and there may not be enough strength. But it's a viable option if you have the skill for that kind of delicate work.

All in all, I suspect that my clean up and glue approach is far less intrusive than any brazing solution, but it's not my bike.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.

Last edited by FBinNY; 09-11-17 at 09:44 PM.
FBinNY is offline   Reply With Quote
Old 09-11-17, 09:56 PM   #10
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 34,498
Mentioned: 91 Post(s)
Tagged: 1 Thread(s)
Quoted: 3080 Post(s)
Quote:
Originally Posted by unterhausen View Post
......

But I have no idea why you would do anything other than use a clip
Ours is not to reason why......
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 09-13-17, 10:27 AM   #11
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 8
Posts: 27,183
Mentioned: 48 Post(s)
Tagged: 0 Thread(s)
Quoted: 2601 Post(s)
Quote:
Originally Posted by yonekura View Post
I actually was curious about what's better guides or stops.
for substituting guides consider zip tie anchor guides,
they really have nothing to break off but the replaceable plastic zip tie.





you could file off the sharp bits and just get self adhesive zip-tie attachment patches or just tape down the housing..






.....
fietsbob is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 06:44 AM.


 
  • Ask a Question
    get answers from real people!
Click to start entering your question.
I HAVE A QUESTION