Search: Posts Made By: tuz
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Forum: Framebuilders
07-05-18, 07:30 AM
Replies: 72
Views: 7,957
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: 604
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: 604
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...
09-08-17, 10:28 AM
Replies: 0
Views: 714
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: 1,401
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: 1,401
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: 1,401
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: 2,039
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: 2,277
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: 1,688
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: 9,554
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: 9,554
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: 9,554
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: 1,832
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: 2,134
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: 1,147
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: 2,691
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: 3,328
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: 3,328
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: 3,004
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: 3,004
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: 1,850
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: 3,886
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: 856
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: 1,850
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: 3,886
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: 1,850
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: 1,850
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: 3,004
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: 3,004
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: 1,771
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: 1,395
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: 1,807
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: 3,026
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.
Forum: Framebuilders
11-25-14, 02:23 PM
Replies: 46
Views: 5,398
Posted By tuz

Procycle in Canada used to manufacture bicycles....

Procycle in Canada used to manufacture bicycles. Cheap ones (CCM) and slightly better ones (Peugeot). I don't think they are produced here anymore.

Here is a vid of their production facility....
Forum: Framebuilders
11-08-14, 05:38 AM
Replies: 7
Views: 1,572
Posted By tuz

If I remember right the fit was tight enough that...

If I remember right the fit was tight enough that a bit of sanding made it fine.

My bending form (wood) is grooved at a 1/2" dia. My friend has the Hammill (I think) with the v-groove.
Forum: Framebuilders
11-07-14, 09:26 PM
Replies: 7
Views: 1,572
Posted By tuz

I never bothered to measure crown sockets or...

I never bothered to measure crown sockets or blades. I usually squish the blades slightly in the required axis (with some back and forth) until it fits.

The trail won't change if you take the...
Forum: Framebuilders
10-21-14, 12:58 PM
Replies: 15
Views: 4,843
Posted By tuz

I also use the tapered rolls on a dremel at low...

I also use the tapered rolls on a dremel at low speed. Filing is difficult... and harder to describe. Basically the file moves mostly parallel to the tubes but with a slight forward motion, from one...
Forum: Framebuilders
10-17-14, 07:39 AM
Replies: 12
Views: 1,334
Posted By tuz

All I can say is that the serrated lugs remind me...

All I can say is that the serrated lugs remind me of Columbine lugs. Not quite as ornate though.
10-14-14, 07:13 AM
Replies: 7
Views: 1,446
Posted By tuz

I'm reviving this old thread since I was faced...

I'm reviving this old thread since I was faced with a similar issue. The plastic cap on the shifter indicated some SIS/friction toggle but it wasn't obvious how to change the mode. Seeing post #4...
Forum: Framebuilders
10-09-14, 08:06 AM
Replies: 13
Views: 3,006
Posted By tuz

My first bender was that Imperial AS triple...

My first bender was that Imperial AS triple bender. Not strong enough for 3/8x0.035 cromo... It broke.
Forum: Framebuilders
10-07-14, 10:03 AM
Replies: 13
Views: 3,006
Posted By tuz

I have the 300 series Ridgids. Pretty cheap on...

I have the 300 series Ridgids. Pretty cheap on eBay and they do the job. I didn't know they were susceptible to breaking. Mine have help up fine on 0.035 wall cromo.
Forum: Framebuilders
09-29-14, 09:42 AM
Replies: 13
Views: 1,945
Posted By tuz

Terraferma cycles?

Terraferma cycles?
Forum: Framebuilders
09-24-14, 01:59 PM
Replies: 64
Views: 11,233
Posted By tuz

I think the Meco can be used with both fuel...

I think the Meco can be used with both fuel gasses. The tips are slightly different but are basically compatible (the recess reduces the tendency of the propane flame to detach and keeps it closer to...
Forum: Framebuilders
09-24-14, 01:52 PM
Replies: 64
Views: 11,233
Posted By tuz

Some factories did it I think. Not really a...

Some factories did it I think. Not really a hearth, but the frame was fixtured on a jig that had multiple torches blasting each joint. Some preform was inserted to make an internal fillet. I think...
Forum: Framebuilders
09-24-14, 08:50 AM
Replies: 64
Views: 11,233
Posted By tuz

True. With oxy, you can generate the same amount...

True. With oxy, you can generate the same amount of heat with a much smaller tip. Heats a smaller area quickly and efficiently.

And yes the hearth brazers used a HUGE flame from a 1" (or...
Forum: Framebuilders
09-23-14, 11:40 AM
Replies: 64
Views: 11,233
Posted By tuz

I got started on a mapp torch. I made a bunch of...

I got started on a mapp torch. I made a bunch of racks and it works well for that. It'll work for braze-ons. And people make it work for frames too. I'm tempted to build a lugged brass frame using a...
Forum: Framebuilders
09-21-14, 08:44 AM
Replies: 64
Views: 11,233
Posted By tuz

The oxy-map kits will work for a few braze-ons...

The oxy-map kits will work for a few braze-ons but you'll exhaust the oxygen quickly, meaning you'll have to buy more.

If you really want to build frames, it'll cost... Unfortunately...
Forum: Framebuilders
09-11-14, 10:55 AM
Replies: 3
Views: 1,015
Posted By tuz

You could have indented the stays then, and you...

You could have indented the stays then, and you could indent them now. Here are some illustrations from A. Wetmore. Can't guarantee that it won't scar the paint...

Alex Wetmore is always busy with...
Forum: Framebuilders
09-10-14, 08:05 AM
Replies: 12
Views: 2,555
Posted By tuz

I guess you are referring to the 0.6-0.4-0.5 seat...

I guess you are referring to the 0.6-0.4-0.5 seat tubes (the other round tubes have 0.7 butts as shown in post 8). I did use one on a recent lugged built. It think it's intended for TIG since the...
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