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Search: Posts Made By: tuz
Showing results 1 to 50 of 1000
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Forum: Framebuilders
02-06-22, 11:33 AM
Replies: 16
Views: 2,086
Posted By tuz

Nice! Didn't notice it in the first pic. It's...

Nice! Didn't notice it in the first pic. It's nice that your lock has slanted slots, makes locating the braze-ons less critical. Mine have vertical slots which don't always match the seatstay...
Forum: Framebuilders
02-06-22, 09:44 AM
Replies: 16
Views: 2,086
Posted By tuz

I'm mostly a commuter and I find kickstands very...

I'm mostly a commuter and I find kickstands very practical. Have them on three customs bikes, with a kickstand plate. The Esge double-leg is very good and I even managed to wear one out (it still...
Forum: Framebuilders
09-02-21, 02:50 PM
Replies: 29
Views: 3,054
Posted By tuz

I agree this looks like a tubing defect. I'm...

I agree this looks like a tubing defect.

I'm surprised OP can't find a builder for a Keirin-type frame. They're a bit simpler to make than a road frame and much simpler than a rando frame with...
Forum: Framebuilders
09-02-21, 02:22 PM
Replies: 47
Views: 6,340
Posted By tuz

Maybe you could ease the bend (increase radius)...

Maybe you could ease the bend (increase radius) of the twin tubes and lower the intersection with the seat tube? (Edit: in order to effectively shorten the tubes)

Also, wondering why there are...
Forum: Framebuilders
08-19-21, 07:33 PM
Replies: 14
Views: 3,962
Posted By tuz

The key is heat, not temperature. You can melt...

The key is heat, not temperature. You can melt steel with propane and a simple furnace. You can braze a frame with air-propane with brass and a hearth. But these are techniques from the late 1800's....
Forum: Framebuilders
08-19-21, 02:35 PM
Replies: 11
Views: 1,035
Posted By tuz

I agree that these don't look too bad. The edges...

I agree that these don't look too bad. The edges are likely rounded, maybe you can file/thin them a bit more to bring a crisper 90deg edge on the shorelines?
Forum: Framebuilders
08-10-21, 09:01 AM
Replies: 14
Views: 1,380
Posted By tuz

Another option is to shorten the steer tube via...

Another option is to shorten the steer tube via splice and welding. I'm not sure if 531 can be welded. Costly if you can't do it yourself.
Forum: Framebuilders
08-09-21, 01:19 PM
Replies: 13
Views: 2,463
Posted By tuz

I've modded a half-dozen Mafacs using generic...

I've modded a half-dozen Mafacs using generic 8x10x10 brass bushings. Might be worth a try.
Forum: Framebuilders
08-07-21, 04:56 PM
Replies: 47
Views: 6,340
Posted By tuz

I think that's a great project. You can probably...

I think that's a great project. You can probably lower the BB a bit (270 mm height) with 170mm crank arms.
Forum: Framebuilders
08-05-21, 07:15 PM
Replies: 11
Views: 2,079
Posted By tuz

ClydeClydeson V-brakes are fine (although the...

ClydeClydeson V-brakes are fine (although the modulation is different) but if OP is going for a vintage-style built they would look out of place. Brazed-on CP are pretty good, especially the Mafac...
Forum: Framebuilders
08-04-21, 07:42 AM
Replies: 11
Views: 2,079
Posted By tuz

I have brazed bosses for Weinmann CP brakes....

I have brazed bosses for Weinmann CP brakes. Actually I don't remember the exact type, but I chose them because the boss spacing was wider than Mafac and fit the seatstays better. I used modded canti...
Forum: Framebuilders
07-30-21, 11:23 AM
Replies: 2
Views: 673
Posted By tuz

Last I checked many years ago, Marinoni sold...

Last I checked many years ago, Marinoni sold Columbus tubing, as well as braze-ons, lugs, etc.

Edit. Metalsupermarket has steel tubing, but not 4130 I think
Forum: Framebuilders
07-27-21, 10:12 AM
Replies: 460
Views: 311,288
Posted By tuz

Not a build but a WIP. Carbon fibre lug in the...

Not a build but a WIP. Carbon fibre lug in the style of Calfee for Lemond's 1990 frames. 3D-printed 3-piece moulds, wet layup, consolidation by mechanical clamping.
...
Forum: Framebuilders
07-19-21, 08:50 AM
Replies: 460
Views: 311,288
Posted By tuz

https://cimg3.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg3.ibsrv.net/gimg/bikeforums.net-vbulletin/640x480/20210719_090335_88e01896b4ab6d3f4ae27a1226eba6266de514af.jpg
Here's a tandem I made a few years ago...
Forum: Framebuilders
07-18-21, 07:17 AM
Replies: 21
Views: 3,280
Posted By tuz

You are correct, good catch! I was fooled by the...

You are correct, good catch! I was fooled by the rust pattern. I have a matching seat lug but it's a modern repro like the crown.
Forum: Framebuilders
07-17-21, 01:31 PM
Replies: 21
Views: 3,280
Posted By tuz

https://cimg2.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg2.ibsrv.net/gimg/bikeforums.net-vbulletin/640x480/20210717_151258_dc4b16582cdc2f98bc98933208cb0fad480052a3.jpg
3 Rensho? The crown is modern, lugs are old(er).
...
Forum: Framebuilders
07-05-18, 07:30 AM
Replies: 72
Views: 18,148
Posted By tuz

I would test out a pinned joint before...

I would test out a pinned joint before committing. If your jig is not rigid enough there is a chance you'll throw the mitre off inside the lug when you drill for the pin. I've tried it and was...
Forum: Framebuilders
06-04-18, 11:36 AM
Replies: 7
Views: 1,420
Posted By tuz

I'll shoot pictures later. If you are trimming...

I'll shoot pictures later. If you are trimming from the bottom you need to bend the blades more than usual (with knowledge of the bending radius you can sort of predict by how much), or cut the blade...
Forum: Framebuilders
06-04-18, 08:26 AM
Replies: 7
Views: 1,420
Posted By tuz

I have done exactly that for a cargo bike, using...

I have done exactly that for a cargo bike, using the fancy Pacenti crown. I used standard blades; you'll want to trim them from the bottom as much as possible. But I don't know if all fork blades...
Forum: Tandem Cycling
09-08-17, 10:28 AM
Replies: 0
Views: 1,403
Posted By tuz

Freewheel (kiddie) stoker

I didn't found a lot of info on that online so I'll share what I did to arrange a freewheel stoker crank for my almost 4-year old daughter. The set up uses front drive with a left side sync chain and...
Forum: Framebuilders
06-05-17, 02:13 PM
Replies: 9
Views: 2,408
Posted By tuz

Yes 304 or 316 stainless has half the yield...

Yes 304 or 316 stainless has half the yield strength of 4130 so thicker is better. Thin 304 is especially poor for clamps as it deforms easily.
Forum: Framebuilders
06-05-17, 01:49 PM
Replies: 9
Views: 2,408
Posted By tuz

Yes 2 M6 binders would for fine. If you are...

Yes 2 M6 binders would for fine. If you are getting weaker steel alloys in lieu of 4130 I'd go with thicker sections.
Forum: Framebuilders
06-05-17, 12:58 PM
Replies: 9
Views: 2,408
Posted By tuz

22.2mm is 7/8"=0.875". You should get a...

22.2mm is 7/8"=0.875". You should get a 1.125x0.058" tube for the handlebar clamp; ID allows a nice slip fit for 25.4mm=1.00" bars. You can get straight gauge 4130 cromo at aircraft spruce.

For...
Forum: Framebuilders
05-29-17, 08:28 AM
Replies: 16
Views: 3,044
Posted By tuz

Yeah the fillets are uneven and poorly polished....

Yeah the fillets are uneven and poorly polished. That bow and wrinkles on the top tube are NOT normal. Tubes do deform under heat but they simply get a bit ovalised near the joint. Generally "stress...
Forum: Framebuilders
05-29-17, 07:51 AM
Replies: 10
Views: 3,284
Posted By tuz

A 72 to 66 mm trail change sounds a bit small and...

A 72 to 66 mm trail change sounds a bit small and I doubt it will have a noticeable effect. Seeing the amount of clearance on the fork you could try finding a shorter fork? That'll increase the HT...
Forum: Framebuilders
12-29-16, 10:10 AM
Replies: 21
Views: 2,866
Posted By tuz

The main challenge in filling/grinding the...

The main challenge in filling/grinding the dropouts would be in properly securing the frame. You would need tapered tube blocks and a vise to hold the chainstay as close to the dropout as possible....
Forum: Framebuilders
12-13-16, 11:31 AM
Replies: 28
Views: 18,044
Posted By tuz

Not generally true. Stainless is routinely brazed...

Not generally true. Stainless is routinely brazed with Silver alloys that have over 15% Zinc.

What you say is true for the Reynolds 921 material, as far as I know.
Forum: Framebuilders
12-09-16, 08:31 AM
Replies: 28
Views: 18,044
Posted By tuz

Superior 609LB is the other flux I know of. Never...

Superior 609LB is the other flux I know of. Never used it but I think it should be quite similar to the CD stuff.
Forum: Framebuilders
12-01-16, 09:42 AM
Replies: 28
Views: 18,044
Posted By tuz

I have a bit of experience with Nickel-Silver...

I have a bit of experience with Nickel-Silver (bad name: it's brass with Nickel) and 304 stainless. It's a nice brazing alloy: cheap, good for fillets, doesn't tarnish and it's a good colour match...
Forum: Framebuilders
06-13-16, 07:36 AM
Replies: 8
Views: 5,265
Posted By tuz

What is the tubing section for the steering...

What is the tubing section for the steering linkage? It needs to be stiff. On my cargo bike by it's 1x0.035. I tried 5/8x0.35 at first... awful shimmy.

The front wheel naturally wobbles like a...
Forum: Framebuilders
09-10-15, 08:15 AM
Replies: 8
Views: 3,484
Posted By tuz

I've made my own out of 2 mm (80 thou) plate, and...

I've made my own out of 2 mm (80 thou) plate, and by brazing a piece of rod (instead of bending the plate) and an eyelet for the fender. It's tricky to locate the bolt hole properly.
Forum: Framebuilders
08-04-15, 09:24 AM
Replies: 13
Views: 1,304
Posted By tuz

You won't melt the post with a propane torch, the...

You won't melt the post with a propane torch, the heat will diffuse away. Looks like there is little room to hook up a slide hammer. Try slotting the post into section with a hacksaw or reciprocating...
Forum: Framebuilders
06-18-15, 02:19 PM
Replies: 34
Views: 5,757
Posted By tuz

Curved tubes can be aesthetically pleasing and...

Curved tubes can be aesthetically pleasing and are sometime functional (chainstays/seatstays for tire clearance, seat tube for short wheelbase, fork blades for some level of suspension or for...
Forum: Framebuilders
06-15-15, 11:59 AM
Replies: 26
Views: 13,715
Posted By tuz

Regarding the costs... Are you planing on...

Regarding the costs... Are you planing on building a frame? If so I would expect greater expenses arising from the needed equipment and skill learning.
Forum: Framebuilders
06-15-15, 09:30 AM
Replies: 26
Views: 13,715
Posted By tuz

What's your source for mild steel tubing?...

What's your source for mild steel tubing? Aircraft spruce's 0.035"-walled 4130 tubing is about $5/foot and $7/foot for tubing under and over 1" diameter, respectively. You can get a full kit of...
Forum: Framebuilders
06-14-15, 11:10 AM
Replies: 34
Views: 4,112
Posted By tuz

Thanks! The stem is chrome-plated steel, made for...

Thanks! The stem is chrome-plated steel, made for the frame. Here is a pic of the cable routing. Somewhat hidden is a loop of housing for the front derailleur.

457932
Forum: Framebuilders
06-13-15, 07:18 PM
Replies: 34
Views: 4,112
Posted By tuz

Some progress on the bike... just need some long...

Some progress on the bike... just need some long straight pieces to jig up the front...

457851



OP, will you deliver?
Forum: Framebuilders
06-03-15, 08:12 AM
Replies: 26
Views: 2,924
Posted By tuz

I'd say that as long as the patch is within a few...

I'd say that as long as the patch is within a few cm of the butt transition it should be fine. This looks like a road bike; MTBs with long suspension forks will see much higher stresses, hence the...
Forum: Framebuilders
05-29-15, 07:23 AM
Replies: 42
Views: 5,475
Posted By tuz

Well it was heated enough to temper it, it's...

Well it was heated enough to temper it, it's chrome plated, and a new steer tube costs $10...
Forum: Framebuilders
05-28-15, 07:32 AM
Replies: 5
Views: 990
Posted By tuz

The inside dents are for tire clearance, the...

The inside dents are for tire clearance, the outside dent is for chainring clearance.
Forum: Framebuilders
05-25-15, 01:11 PM
Replies: 26
Views: 2,924
Posted By tuz

It's really up to you. Did you set the lug...

It's really up to you.

Did you set the lug at the right angle, but it moved during brazing?
Forum: Framebuilders
05-25-15, 01:09 PM
Replies: 42
Views: 5,475
Posted By tuz

You would need to remove the plating, clean the...

You would need to remove the plating, clean the crown's ID and braze a new steer tube in along with a ring to accept the crown race. You need a jig to ensure the proper alignment of the steer tube....
Forum: Framebuilders
05-22-15, 12:42 PM
Replies: 26
Views: 2,924
Posted By tuz

I would open the fit, focusing on the top of the...

I would open the fit, focusing on the top of the socket near the HT and try to bend the bottom spoon of the lug. The lug should slide with little force anyway and not be too tight. Bending after...
Forum: Framebuilders
05-22-15, 10:42 AM
Replies: 26
Views: 2,924
Posted By tuz

Yes it's hard to clamp the top of the lug....

Yes it's hard to clamp the top of the lug. Sometimes holding it in a vise works a bit better. I would have no worries about opening up the lug a little. How tight is the fit? And how do you check the...
Forum: Framebuilders
05-11-15, 07:28 AM
Replies: 34
Views: 4,112
Posted By tuz

Nobody in their right mind has room for a cargo...

Nobody in their right mind has room for a cargo bike. But after using one I say it's worth it!
Forum: Framebuilders
05-08-15, 05:35 PM
Replies: 34
Views: 4,112
Posted By tuz

Something I did recently: 450039 Something...

Something I did recently:
450039

Something I'm working on:
450040
Forum: Framebuilders
03-19-15, 12:45 PM
Replies: 9
Views: 2,189
Posted By tuz

Agreed! Nice to see another supplier. And the...

Agreed! Nice to see another supplier. And the rack tabs look great too.
Forum: Framebuilders
02-10-15, 12:40 PM
Replies: 14
Views: 2,079
Posted By tuz

I've built two forks with 20x2.0" (ISO 406)...

I've built two forks with 20x2.0" (ISO 406) wheels, so roughly the save size if you have small tires. I used plate dropouts (slotted blade) and trimmed as much as possible on the small end. It was...
Forum: Framebuilders
02-04-15, 08:58 AM
Replies: 24
Views: 3,137
Posted By tuz

I think that you should do some test joints...

I think that you should do some test joints before jumping into the actual frame. Get some cheap lugs and tubing. Take that joint as practice and cut it up to see what sort of penetration you got....
Forum: Framebuilders
12-17-14, 11:35 AM
Replies: 11
Views: 4,550
Posted By tuz

Posts for centrepulls are shorter (10mm) that...

Posts for centrepulls are shorter (10mm) that those for cantis, but the OD is the same. Like was said the spacing is more critical with centrepulls than for cantis.
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