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Search: Posts Made By: guy153
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Forum: Framebuilders
09-18-21, 10:58 AM
Replies: 2
Views: 82
Posted By GrayJay

Fix would require un-brazing the bent fork legs...

Fix would require un-brazing the bent fork legs from the crown, replace with new legs. While it is possible, unless you can do the work yourself, probably more economical to just find a different...
Forum: Framebuilders
09-18-21, 10:36 AM
Replies: 2
Views: 82
Posted By unterhausen

I have straightened a lot of forks. I think that...

I have straightened a lot of forks. I think that one is a write-off. The buckling is too severe for me. Yes, it can be bent back into shape, except the part that is buckled will still be buckled. ...
Forum: Framebuilders
09-18-21, 07:20 AM
Replies: 14
Views: 378
Posted By Doug Fattic

There are 2 ways to design a bike frame. The most...

There are 2 ways to design a bike frame. The most common is to like borrow the Italian road racing design outlined in the CONI manual (there is an English translation). This assumes the purpose of...
Forum: Framebuilders
09-17-21, 11:45 AM
Replies: 0
Views: 61
Posted By shelgame

MTB --> Cargo Bike Conversion

Last year, the local rails-to-trails system was extended to within a mile of my house. The trail already went to the nearby Kroger parking lot.

I've been wanting to build this little...
Forum: Framebuilders
09-17-21, 07:54 AM
Replies: 25
Views: 1,058
Posted By shelgame

Took the frame out of the stand and weighed it...

Took the frame out of the stand and weighed it this morning. 6.4lb before filing (not that that will take much weight off). Not 'lightweight', but much lighter than the donor frame at ~10lbs.

Also...
Forum: Framebuilders
09-16-21, 07:31 PM
Replies: 25
Views: 1,058
Posted By shelgame

Fillets! I'm still working on my technique. They...

Fillets! I'm still working on my technique. They don't look so great naked, but they'll clean up.

https://live.staticflickr.com/65535/51484955228_fb35a87847_c.jpg
...
Forum: Framebuilders
09-13-21, 08:54 PM
Replies: 14
Views: 378
Posted By bulgie

Yeah I've been liking the long TT, short stem...

Yeah I've been liking the long TT, short stem idea for a while now. It also lets you have a reasonably steep HTA (which I like for pavement) without toe overlap, and without steepening the STA...
Forum: Framebuilders
09-11-21, 07:03 AM
Replies: 11
Views: 318
Posted By TiHabanero

About chain stay length, it has been my recent...

About chain stay length, it has been my recent experience with the 2 cm extra length on my home made bike does not affect climbing at all. 43.5cm vs. 41.5cm.
In no way am I a strong climber, never...
Forum: Framebuilders
09-11-21, 03:47 AM
Replies: 11
Views: 318
Posted By unterhausen

You don't need to steepen the STA to shorten the...

You don't need to steepen the STA to shorten the stays though, you can curve the seat tube. Although my elmariachi has the seat tube bent in such a way that it doesn't really improve clearance. ...
Forum: Framebuilders
09-10-21, 06:27 PM
Replies: 11
Views: 318
Posted By duanedr

I believe the STA is steeper to allow shortening...

I believe the STA is steeper to allow shortening the rear end which helps in climbing. Shallower HTA and more rake would provide more compliance and stability. PVD used a 'trailing axle' design on...
Forum: Framebuilders
09-10-21, 03:23 PM
Replies: 11
Views: 318
Posted By unterhausen

As I understand it, the great ensteepening is...

As I understand it, the great ensteepening is because it makes it easier to climb steep hills. That's what my lbs advises anyway.
Forum: Framebuilders
09-10-21, 01:18 PM
Replies: 11
Views: 318
Posted By unterhausen

That's an interesting point about STA, and a lot...

That's an interesting point about STA, and a lot of people don't have their fit dialed in to the point they know they have done that to themselves. I have wondered about the trend on mtb's to...
Forum: Framebuilders
09-10-21, 08:10 AM
Replies: 429
Views: 273,211
Posted By ponchotempest

Thanks, that's why I didn't paint it before the...

Thanks, that's why I didn't paint it before the first ride. After one successful ride I just sprayed on a clear coat so it won't rust and I can keep an eye on it.
Forum: Framebuilders
09-10-21, 07:17 AM
Replies: 11
Views: 318
Posted By 8aaron8

I would add that, in my experience, the steeper...

I would add that, in my experience, the steeper seat tube angle plays a large role in comfort as it is pushing the riders weight over the front of the bike potentially increasing the stress on the...
Forum: Framebuilders
09-09-21, 12:41 PM
Replies: 11
Views: 339
Posted By unterhausen

I was very careless when I drafted this post,...

I was very careless when I drafted this post, sorry. Like guy153 says, it's best to sneak up on the right width. My main point is you are going to have to bend it past where it needs to go because of...
Forum: Framebuilders
09-09-21, 09:01 AM
Replies: 25
Views: 1,058
Posted By ColinD

What a cool project! I love the old cruiser...

What a cool project! I love the old cruiser frames. I picked up an old Schwinn Spitfire and am gathering parts. Your post are inspiring and motivating!
Forum: Framebuilders
09-09-21, 08:49 AM
Replies: 25
Views: 1,058
Posted By shelgame

It's on the bike stand waiting for me to finish...

It's on the bike stand waiting for me to finish the fillets. But, first I made sure the internal cable routing was going to work. Looks OK to me!
...
Forum: Framebuilders
09-08-21, 08:01 PM
Replies: 25
Views: 1,058
Posted By andyinabox

Love this project, look forward to seeing it...

Love this project, look forward to seeing it built up!
Forum: Framebuilders
09-08-21, 09:37 AM
Replies: 429
Views: 273,211
Posted By ponchotempest

Just finished my first complete frame. It's...

Just finished my first complete frame. It's mostly Columbus Zona tubing with a 38mm downtube, 44mm headtube, 27.2 seatpost, non-boost spacing. It has plenty of clearance for 29x2.3 tires, and could...
Forum: Framebuilders
09-08-21, 09:35 AM
Replies: 14
Views: 378
Posted By Andrew R Stewart

I use BikeCad Pro. Decided years ago that I would...

I use BikeCad Pro. Decided years ago that I would be doing this stuff for a long time more and the cost then was worth it. I still feel this way and am glad I did.

When I started out I did full...
Forum: Framebuilders
09-06-21, 09:46 PM
Replies: 25
Views: 695
Posted By Doug Fattic

Here is a picture of a frame I made for my nephew...

Here is a picture of a frame I made for my nephew where I used double bend oval chain stays that required I modify the angles of the CS sockets so they fit the bend of the stays. I used this punch...
Forum: Framebuilders
09-06-21, 05:35 PM
Replies: 11
Views: 339
Posted By bulgie

I think what you're referring to as memory is...

I think what you're referring to as memory is better described as yield strength. Most structural metals (especially steel) have a range of stress that deflects the metal only elastically, so that...
Forum: Framebuilders
09-06-21, 03:59 PM
Replies: 11
Views: 339
Posted By TiHabanero

531 stays have a good memory

Spent a better part of the morning attempting to spread the rear end of an 81 Raleigh Competition GS to 135 spacing. The frame is full Reynolds 531 with butted main tubes. It was set at 125 from the...
Forum: Framebuilders
09-05-21, 07:43 PM
Replies: 25
Views: 695
Posted By Doug Fattic

I've modified the oval sockets on a BB shell to...

I've modified the oval sockets on a BB shell to fit double bent chain stays. I used a punch I hit with a light hammer to bend them to my will. It wasn't overly difficult. A number of my...
Forum: Framebuilders
09-05-21, 06:31 PM
Replies: 25
Views: 1,058
Posted By shelgame

Tacked up the frame today. ...

Tacked up the frame today.

https://live.staticflickr.com/65535/51428637270_d3bcd8dd4b_c.jpg

https://live.staticflickr.com/65535/51427661796_a5c84f348c_c.jpg
Forum: Framebuilders
09-05-21, 06:24 PM
Replies: 25
Views: 695
Posted By unterhausen

I don't think you need to use brass for my...

I don't think you need to use brass for my technique. It's not obvious, but I have closed up the socket all the way around. It takes some work. Even though they are castings, bb shells are pretty...
Forum: Framebuilders
09-05-21, 05:40 PM
Replies: 25
Views: 695
Posted By Andrew R Stewart

And Eric's socket manipulations and gap closing...

And Eric's socket manipulations and gap closing is a big reason why I use brass/bronze filler a lot on lugged sockets. I've "adjusted" main frame lugs as much as 6* before and the gaps never really...
Forum: Framebuilders
09-05-21, 02:23 PM
Replies: 25
Views: 695
Posted By ryanlath

Thanks! This is the route I'm going!

Thanks! This is the route I'm going!
Forum: Framebuilders
09-05-21, 01:34 PM
Replies: 25
Views: 695
Posted By unterhausen

Process pics: 1st is where I have bent the socket...

Process pics: 1st is where I have bent the socket out. There is a pretty big gap between the socket and stay on the inside. If you are using a typical bench vise with metal jaws, I would use soft...
Forum: Framebuilders
09-03-21, 08:50 PM
Replies: 25
Views: 1,058
Posted By shelgame

Worked on the fork today. This came off a...

Worked on the fork today. This came off a Diamondback Response. The frame was alloy, but the fork was rigid CroMo. It's the basic shape that I wanted, and it will fit probably up to a 700-50 tire;...
Forum: Framebuilders
09-03-21, 09:51 AM
Replies: 29
Views: 980
Posted By duanedr

My understanding from some cursory research (I'm...

My understanding from some cursory research (I'm not an expert on Keirin racing!) is that to be a true 'Keirin' bike, it has to be made by a certified builder of specific sized tubes and lugs so,...
Forum: Framebuilders
09-02-21, 01:49 PM
Replies: 29
Views: 980
Posted By unterhausen

I was curious if it's seam welded tubing, but too...

I was curious if it's seam welded tubing, but too lazy to check. There are lots of good tubes that are seam welded and then drawn. Some of the high-end stainless, for example. Some tubes...
Forum: Framebuilders
09-01-21, 08:01 PM
Replies: 25
Views: 1,058
Posted By shelgame

Thanks, I checked those bars out. I may end up...

Thanks, I checked those bars out. I may end up going with a swept back bar like that, but I'd rather start with something more like the Wald 803. More BMX-like. My inspiration is the State Bicycle...
Forum: Framebuilders
09-01-21, 04:37 PM
Replies: 25
Views: 1,058
Posted By shelgame

A little more progress... Chain stays...

A little more progress...

Chain stays fitted.
https://live.staticflickr.com/65535/51415390630_80bcfc0336_c.jpg (https://www.flickr.com/gp/146396513@N07/Y8372f)

Cleaned up the donor top tubes....
Forum: Framebuilders
09-01-21, 02:24 PM
Replies: 29
Views: 980
Posted By unterhausen

Like I said: I think if you welded it,...

Like I said:


I think if you welded it, you would end up with two cracks, because it's likely that the flaw extends to the ends of the tube . There is no point in stop drilling if you are going...
Forum: Framebuilders
09-01-21, 09:43 AM
Replies: 29
Views: 980
Posted By unterhausen

I don't think this one has anything to do with...

I don't think this one has anything to do with temperature. It's cracked right in the middle. I bet if you cut that tube out you could see a flaw in the tube.
Forum: Framebuilders
09-01-21, 06:38 AM
Replies: 29
Views: 980
Posted By Doug Fattic

Ethet, this is a forum to exchange ideas on...

Ethet, this is a forum to exchange ideas on building our own frames. Why not build your next frame yourself? A track frame with .9/.6/.9 tubing (like the Kaisai 019) is an easy build. If you are not...
Forum: Framebuilders
08-29-21, 08:41 PM
Replies: 29
Views: 980
Posted By ethet

The lovely thing is that in all of these keirin...

The lovely thing is that in all of these keirin frames that I have which seem to be failing, this one actually has the decal on the seat tube denoting the tubing:...
Forum: Framebuilders
08-29-21, 07:05 PM
Replies: 29
Views: 980
Posted By ethet

The downtube is cracked, empirically. Thanks so...

The downtube is cracked, empirically. Thanks so much for the help :)
Forum: Framebuilders
08-29-21, 06:30 PM
Replies: 29
Views: 980
Posted By ethet

This is a brilliant idea and I'll set up the...

This is a brilliant idea and I'll set up the conditions for the experiment here following the postage of this message, purely for science... Since tacking my query, I reviewed earlier photos of my...
Forum: Framebuilders
08-29-21, 06:03 PM
Replies: 29
Views: 980
Posted By Andrew R Stewart

The first thing I would do is try to determine if...

The first thing I would do is try to determine if this is a crack in the tube or just the finish. One way could be to drip some fluid (WD-40?) inside the tube and then position the frame so the...
Forum: Framebuilders
08-28-21, 12:49 PM
Replies: 25
Views: 1,058
Posted By shelgame

Progress pics. Jig is setup. Seat tube is fitted....

Progress pics. Jig is setup. Seat tube is fitted. Seat tube top cone needs a post. I'll have to figure that out next.

https://live.staticflickr.com/65535/51409374715_7c13a07a08_c.jpg
...
Forum: Framebuilders
08-25-21, 12:15 PM
Replies: 27
Views: 1,007
Posted By unterhausen

The sanding mandrels pictured in this thread made...

The sanding mandrels pictured in this thread made me wonder about a tapered one for tapered headtubes. Might have to go to little strips of sandpaper. Or glue
Forum: Framebuilders
08-23-21, 06:37 AM
Replies: 27
Views: 1,007
Posted By unterhausen

If you use sanding drums on a lathe, my...

If you use sanding drums on a lathe, my recommendation is to get a big sheet of rubber to catch all the dust and protect the ways. And don't use air to clean off the ways afterwards, use a vacuum.
Forum: Framebuilders
08-22-21, 05:22 PM
Replies: 27
Views: 1,007
Posted By mikeread

If you go the sanding drum route - make them...

If you go the sanding drum route - make them longer than I did if you can. More abrasive = fewer changes :)
Forum: Framebuilders
08-22-21, 03:51 PM
Replies: 27
Views: 1,007
Posted By mikeread

If you have a lathe it is dead easy to make your...

If you have a lathe it is dead easy to make your own drum sanders to exactly the right diameter (allow for the thickness of your abrasive)

Rough out the miter with a hacksaw and file and then...
Forum: Framebuilders
08-22-21, 11:34 AM
Replies: 27
Views: 1,007
Posted By Doug Fattic

A couple of tips using hole saws to miter tubes....

A couple of tips using hole saws to miter tubes. 1st they work better if you get the Paragon hole saw holders. The ones that are supplied are a bit flimsy. Unterhausen already mentioned to face the...
Forum: Framebuilders
08-22-21, 10:31 AM
Replies: 27
Views: 1,007
Posted By unterhausen

A holesaw will cut a little large unless you do...

A holesaw will cut a little large unless you do something about it. But I would expect to file a little anyway. Most people face the mounting surface of the saw. If you leave it, it will wobble...
Forum: Framebuilders
08-20-21, 06:30 PM
Replies: 11
Views: 504
Posted By headwind15

OPs history:

First has to do with the (what was a yellow with full chrome rear end and forks) Cinelli. I bought it in 1976, when I was 15 yrs old. (unbeknown to me Greg Lemond's father bought Greg a similar...
Forum: Framebuilders
08-19-21, 06:57 AM
Replies: 15
Views: 837
Posted By unterhausen

Thanks for telling us your experience. Was the...

Thanks for telling us your experience. Was the welding school a general technical school?

Now I'm hungry for some cheese.
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