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Forum: Framebuilders
06-12-24, 07:29 PM
Replies: 4
Views: 279
Posted By JohnDThompson

+1 this. For a chainstay stop, I'd clamp a...

+1 this. For a chainstay stop, I'd clamp a needle-nose vise-grip onto the stop, position it over a bucket of water it so gravity will make it drop into the water when the braze is molten. Keep the...
Forum: Framebuilders
06-09-24, 08:28 AM
Replies: 4
Views: 279
Posted By unterhausen

It was possibly held on with brass. Or on a...

It was possibly held on with brass. Or on a production bike, it might have been spot welded on and then brazed. The remelt temperature for filler is always a bit higher than the filler's original...
Forum: Framebuilders
05-30-24, 04:55 PM
Replies: 7
Views: 350
Posted By bulgie

My thought was a crumpled front-end repair. It's...

My thought was a crumpled front-end repair. It's nicer to have the paint off before doing frame repairs, no burning paint smoke.

Couple of those frames have expensive PMW dropouts, not likely to...
Forum: Framebuilders
05-30-24, 04:50 PM
Replies: 5
Views: 463
Posted By bulgie

I used to weigh north of 270 (now down to 240 and...

I used to weigh north of 270 (now down to 240 and still working on it), and I've always been happy on 531 frames with .8/.5-ish TT in 1" diameter. Others would feel that's too whippy, but I prefer...
Forum: Framebuilders
05-23-24, 03:26 PM
Replies: 59
Views: 3,075
Posted By bulgie

I don't need to read any academic papers to note...

I don't need to read any academic papers to note that CrMo frames welded in the 1930s and every decade since then are still being ridden (not to mention aerospace, motorsport etc.), So this is just...
Forum: Framebuilders
05-21-24, 06:18 PM
Replies: 14
Views: 537
Posted By bulgie

If you don't have paint or chrome to worry about,...

If you don't have paint or chrome to worry about, you can build up some braze (brass or nickel-silver) on the other side of the slot, then file it to shape. After paint, no one will be the wiser.
...
Forum: Framebuilders
05-21-24, 11:36 AM
Replies: 14
Views: 537
Posted By unterhausen

That's tough, since you probably use more than...

That's tough, since you probably use more than one wheel position. Is it really a problem? There are really only two ways to fix it, file the top of the low dropout, or fix the discrepancy through...
Forum: Framebuilders
05-20-24, 12:26 AM
Replies: 59
Views: 3,075
Posted By unterhausen

I'm not sure where you're getting this stuff...

I'm not sure where you're getting this stuff about atmospheric nitrogen being a problem post-weld. I couldn't find any references to that. Apparently people want to use pure nitrogen as a post-weld...
Forum: Framebuilders
05-19-24, 08:22 PM
Replies: 59
Views: 3,075
Posted By unterhausen

This thread isn't really about bike failures, and...

This thread isn't really about bike failures, and people keep trying to make it about failures. Go read the first post again. If we open it up to failures, then there is a wide world of problems to...
Forum: Framebuilders
05-19-24, 06:00 AM
Replies: 59
Views: 3,075
Posted By unterhausen

There are a lot of wrong assertions in this...

There are a lot of wrong assertions in this thread, and I'm not sure at all why we're talking about springs. I think of all the things that have caused people to be confused about ductile metals,...
Forum: Framebuilders
05-14-24, 09:17 PM
Replies: 3
Views: 350
Posted By bulgie

"Small" dent in the TT and you want to chop the...

"Small" dent in the TT and you want to chop the frame up? Why not just ride it? I'm trying to think if I have any bikes that don't have a dent in the TT. ;) They don't hurt the ride any.

If you...
Forum: Framebuilders
05-13-24, 12:59 PM
Replies: 52
Views: 2,042
Posted By unterhausen

It would be interesting to know more about those...

It would be interesting to know more about those PedalMe wheels. They do appear to have a lot of spokes and very large rotors. Tandem wheels, probably.
Maybe they just replace them often.
Forum: Framebuilders
05-13-24, 12:27 PM
Replies: 52
Views: 2,042
Posted By Andrew R Stewart

As far as the wheels go I think you've entered...

As far as the wheels go I think you've entered the weight capacity/loading range of motorcycle wheels and tires. The issue with talking about wheel "strength" is that it is so variable WRT the...
Forum: Framebuilders
05-10-24, 05:41 PM
Replies: 17
Views: 857
Posted By unterhausen

I forgot to mention that the front triangle is...

I forgot to mention that the front triangle is already mitered and fork blades are raked, so that limits things on the tubing front. Realizing the tubes were ready to braze up was like finding a $20...
Forum: Framebuilders
05-09-24, 04:21 PM
Replies: 52
Views: 2,042
Posted By bulgie

Well one way to avoid cracks is use stronger...

Well one way to avoid cracks is use stronger tubing, like 4130. In my experience, CrMo frames are a lot less likely to crack than carbon-steel as long as you don't go too thin. Maybe not if you're...
Forum: Framebuilders
05-09-24, 10:33 AM
Replies: 8
Views: 399
Posted By PromptCritical

Those look nice - thanks!

Those look nice - thanks!
Forum: Framebuilders
05-05-24, 10:29 AM
Replies: 52
Views: 2,042
Posted By unterhausen

I feel like you should consider a design with...

I feel like you should consider a design with some triangulation so everything doesn't have to be so heavy. I gather part of that is due to available welding tech, but you still have to ride the...
Forum: Framebuilders
04-25-24, 09:17 PM
Replies: 7
Views: 740
Posted By Andrew R Stewart

1" x.25" hot rolled strip. Here's a shot of the...

1" x.25" hot rolled strip. Here's a shot of the first practice of design from a couple years ago and one of the current pair made. When I decided to try disk brakes the traditional dropouts just...
Forum: Framebuilders
04-09-24, 07:43 PM
Replies: 6
Views: 511
Posted By Andrew R Stewart

Good to see better photos. I agree with Eric, If...

Good to see better photos. I agree with Eric, If I were to consider fixing this I would likely replace the tubes. But I'd want to check out the rest of the frame first. Andy
Forum: Framebuilders
04-08-24, 11:40 PM
Replies: 13
Views: 792
Posted By GrayJay

Aluminum tube welding repair is really only...

Aluminum tube welding repair is really only practical on 7005 or other "naturally aged" alu metallurgy. Majority of commercial aluminum frames use 6061-T6 with T6 heat treating needed to restore...
Forum: Framebuilders
04-08-24, 08:17 PM
Replies: 13
Views: 792
Posted By VegasJen

I started watching the video but it didn't take...

I started watching the video but it didn't take long to figure out that is way, way more work than I would want or care to put into this thing. Hell, I'm talking about a $20 frame for a project...
Forum: Framebuilders
04-06-24, 08:55 PM
Replies: 9
Views: 595
Posted By Doug Fattic

i have some Reynolds D shaped fork blades and...

i have some Reynolds D shaped fork blades and matching crowns. They vary in rake and curve. In addition I have steerers from the same era. I got them with some of the framebuilding stuff I acquired...
Forum: Framebuilders
04-06-24, 07:58 AM
Replies: 13
Views: 792
Posted By Andrew R Stewart

Mike- I don't like AL's softness and crack...

Mike- I don't like AL's softness and crack propagation tendency. I don't like the increase of stiffness that is done to combat the fatigue limit problem. I don't like how one has to join it (rivets,...
Forum: Framebuilders
03-15-24, 03:48 PM
Replies: 9
Views: 981
Posted By Nessism

The TDS says you can reduce up to 15% with...

The TDS says you can reduce up to 15% with acetone for spraying. Clean-up with mineral spirits.

Rust-Oleum is Alkyd enamel. You can use hardner, to speed the cure time, and increase hardness. I...
Forum: Framebuilders
03-15-24, 03:03 PM
Replies: 4
Views: 929
Posted By Nessism

Spirit and Life both use the same OMNICROM alloy...

Spirit and Life both use the same OMNICROM alloy steel. The difference is in the shape, thickness, and butting configuration. It would be a mistake to think one or the other is "better".

As...
Forum: Framebuilders
03-06-24, 09:52 AM
Replies: 17
Views: 903
Posted By unterhausen

I think the failure of that fork Andy is talking...

I think the failure of that fork Andy is talking about can be traced back to drilling vent holes on the outside diameter of the crown segment. Those crown segments see a lot of fatigue cycles. They...
Forum: Framebuilders
03-05-24, 06:22 PM
Replies: 12
Views: 979
Posted By unterhausen

What PPE do you use? I probably should start...

What PPE do you use? I probably should start wearing a mask when I braze. When I search online for my asthma symptoms, they may actually be COPD symptoms. So brazing/welding is bad news.
Forum: Framebuilders
03-05-24, 10:23 AM
Replies: 12
Views: 979
Posted By unterhausen

It's going to be difficult to flow silver into...

It's going to be difficult to flow silver into there because you can't clean it properly. I have had luck with brass and dirty surfaces, but that takes a real torch. The problem with not having any...
Forum: Framebuilders
02-15-24, 09:01 AM
Replies: 3
Views: 453
Posted By unterhausen

There is always some blacksmithing involved in...

There is always some blacksmithing involved in getting fork blades into fork crowns. I might not even notice the difference. If there is a gap anywhere, you can bend the crown into compliance and...
Forum: Framebuilders
02-11-24, 01:42 PM
Replies: 6
Views: 484
Posted By bulgie

Ah right, sorry, you said "bike builder". I would...

Ah right, sorry, you said "bike builder". I would call that a bike assembler, but of course I am a framebuilder snob who looks down on anyone who doesn't build their own frames ;) <jk>
Forum: Framebuilders
02-10-24, 01:34 PM
Replies: 11
Views: 702
Posted By unterhausen

Side tack twin top tubes were pretty common on...

Side tack twin top tubes were pretty common on cruisers at one time. Look for pictures of a bike with a fake gas tank.
Forum: Framebuilders
01-18-24, 06:03 PM
Replies: 23
Views: 1,346
Posted By unterhausen

I watch car guys doing miters just to make myself...

I watch car guys doing miters just to make myself feel superior. Same with motorcycle guys brazing fillets.
Forum: Framebuilders
01-18-24, 01:57 PM
Replies: 23
Views: 1,346
Posted By bulgie

There's a youtuber who goes by something like The...

There's a youtuber who goes by something like The Fabricator. I watched his video on notching tubes, which he does for making roll cages for race cars. He notched with a flap wheel in an angle...
Forum: Framebuilders
01-17-24, 03:06 AM
Replies: 23
Views: 1,346
Posted By guy153

I still practice on all my drops :) And often use...

I still practice on all my drops :) And often use the ends of stays for bridge tubes. I just took the paint (it was powder coat) off with a "birds nest" wheel on a grinder which didn't take long.
Forum: Framebuilders
01-16-24, 02:42 PM
Replies: 23
Views: 1,346
Posted By Andrew R Stewart

Many of us did recycle old frames into practice...

Many of us did recycle old frames into practice material but the time it took to clean off the paint was taking away from the practice torch stuff time so speaking for myself I suggest raw tubing as...
Forum: Framebuilders
01-16-24, 01:59 PM
Replies: 59
Views: 3,075
Posted By unterhausen

I think you'll have to drop your rant, road...

I think you'll have to drop your rant, road racing outside of parking lot crits is dying in the U.S.

I see shops saying they can't sell low-end road bikes, just $5000 road bikes. That certainly...
Forum: Framebuilders
01-15-24, 09:08 PM
Replies: 59
Views: 3,075
Posted By bulgie

Even Reynolds used that old canard in their...

Even Reynolds used that old canard in their marketing materials for 753. Any engineers in the company probably winced, and/or hung their heads in shame.
Forum: Framebuilders
01-15-24, 07:48 PM
Replies: 43
Views: 2,997
Posted By bulgie

There's no level of small that my neighbors would...

There's no level of small that my neighbors would like. I'm in an urban neighborhood with postage-stamp sized lots. One neighbor is 10 feet from where I'd be hammering, in the driveway, since I...
Forum: Framebuilders
01-11-24, 10:03 AM
Replies: 14
Views: 2,402
Posted By Andrew R Stewart

I've done similar to what Paul shows, plastic...

I've done similar to what Paul shows, plastic sheeting walled in space for fume control. In my case it was for brazing smells though. I now have a casement window mounted exhaust fan (bought from...
Forum: Framebuilders
01-02-24, 01:18 PM
Replies: 48
Views: 3,344
Posted By PaulJensen

I have one at the moment… See above…!!!…

I have one at the moment… See above…!!!…
Forum: Framebuilders
01-02-24, 11:52 AM
Replies: 48
Views: 3,344
Posted By PaulJensen

Thanks for that… I’ve always been like that… ...

Thanks for that… I’ve always been like that…

Among other things, I’m also a surfboard builder… In 2001 I pioneered a method of building hollow wood surfboards that was ground-zero for all other...
Forum: Framebuilders
01-01-24, 08:07 PM
Replies: 11
Views: 818
Posted By The_Joe

I'm actually using a vintage Shimano seat post in...

I'm actually using a vintage Shimano seat post in very good condition so I'd rather not turn that down, as silly as.it sounds.

Either way, I was able to open the ears a bit and run a quick...
Forum: Framebuilders
12-31-23, 09:41 PM
Replies: 12
Views: 843
Posted By unterhausen

I really should trust bikecad a little more. The...

I really should trust bikecad a little more. The issue is setting up the dropouts is a total thesis on there, and my eyes just glaze over. That's why I'm building a stay/bb specific fixture so I...
Forum: Framebuilders
12-30-23, 06:14 PM
Replies: 11
Views: 818
Posted By 50PlusCycling

Rather than ream out the frame, I would machine...

Rather than ream out the frame, I would machine the 27.2 seat post down until it fits properly. Seat posts are more easily replaceable than frames.
Forum: Framebuilders
12-22-23, 07:31 AM
Replies: 11
Views: 818
Posted By Mark Beaver

I’ve had pretty good luck spreading the ears of a...

I’ve had pretty good luck spreading the ears of a seat lug that’s been compressed by folks using a too-small seatpost; by using a 1 1/8” ie 25.4 diameter quill stem, strategically locating it where...
Forum: Framebuilders
12-21-23, 06:26 PM
Replies: 11
Views: 818
Posted By bulgie

I strongly suggest trying to remove as little...

I strongly suggest trying to remove as little metal as possible. On a frame where the ears have been bent in from mounting a too-small post, you need to gently bend the ears outward befor reaming. I...
Forum: Framebuilders
12-21-23, 06:09 PM
Replies: 8
Views: 837
Posted By unterhausen

that's an impressive body of work. I'm glad you...

that's an impressive body of work. I'm glad you found a source that can make good parts.
Forum: Framebuilders
12-21-23, 06:05 PM
Replies: 11
Views: 818
Posted By unterhausen

You can get a telescoping gauge and check the...

You can get a telescoping gauge and check the dimension at various radial directions. It could well be pinched. I would try to fix that first. Can't fix it without measuring.

I suggest finding a...
Forum: Framebuilders
12-19-23, 06:29 PM
Replies: 10
Views: 1,025
Posted By unterhausen

From now on, respondents in this forum need to...

From now on, respondents in this forum need to rate the perceived danger of a modification/repair/design from 1 to "too dangerous for Mr. Bulgier."
Forum: Framebuilders
12-19-23, 08:25 AM
Replies: 10
Views: 1,025
Posted By Andrew R Stewart

This is one of those "I'd do it on my fork but...

This is one of those "I'd do it on my fork but not for a customer's fork" things. The worst case should be pretty obvious and one that we should all never be a part of for another. Andy
Showing results 1 to 50 of 363
 


 
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