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Search: Posts Made By: BenCooper
Showing results 1 to 50 of 66
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Forum: Framebuilders
07-14-15, 01:21 AM
Replies: 5
Views: 1,069
Posted By BenCooper

Make sure also that your steerer wall thickness...

Make sure also that your steerer wall thickness is thick enough for threading - threading a steerer that's intended for threadless can take away too much metal.
Forum: Framebuilders
05-09-15, 01:24 PM
Replies: 34
Views: 4,145
Posted By BenCooper

They're Brompton forks, the fitting is for the...

They're Brompton forks, the fitting is for the handlebar catch.
Forum: Framebuilders
05-09-15, 01:23 AM
Replies: 34
Views: 4,145
Posted By BenCooper

450115 450116 All on less than four hours...

450115 450116

All on less than four hours sleep because of the election ;-)
Forum: Framebuilders
05-08-15, 04:33 PM
Replies: 34
Views: 4,145
Posted By BenCooper

I built five forks today, is that good enough for...

I built five forks today, is that good enough for you?
Forum: Framebuilders
03-16-15, 11:00 AM
Replies: 7
Views: 1,467
Posted By BenCooper

I don't find enough variation between blades to...

I don't find enough variation between blades to bother with, as long as they're the same material.
Forum: Framebuilders
03-16-15, 03:18 AM
Replies: 7
Views: 1,467
Posted By BenCooper

Yes. I've modified mine by adding indexing holes...

Yes. I've modified mine by adding indexing holes for repeatable bends, and I've replaced the bolts with pins and spring clips so I can quickly swap the handle across.
Forum: Framebuilders
03-15-15, 02:59 AM
Replies: 7
Views: 1,467
Posted By BenCooper

I've got one, I don't think I have any pics of...

I've got one, I don't think I have any pics of the bends, though - next to the 10" they're just a bit tighter. I use it sometimes for altering the curve of forks.
Forum: Framebuilders
03-13-15, 05:23 PM
Replies: 14
Views: 1,684
Posted By BenCooper

Depends how much of a spring there is. Most of...

Depends how much of a spring there is. Most of the time it's not much, only a couple of mm, so not worth bothering with - it can easily ping into place whenever the customer assembles the bike. If...
Forum: Framebuilders
03-13-15, 02:52 AM
Replies: 14
Views: 1,684
Posted By BenCooper

A tube wants to bend, but it can't because it's...

A tube wants to bend, but it can't because it's attached to other tubes. I see it sometimes when retrofitting S&S BTCs, cut the frame and the cut ends spring apart.

I'm not sure it's a problem as...
Forum: Framebuilders
03-12-15, 02:46 AM
Replies: 14
Views: 1,684
Posted By BenCooper

Depends on the jig, but most jigs won't heat up...

Depends on the jig, but most jigs won't heat up enough to deflect significantly - however tacking in the jig and brazing freehand has the advantage that you can reposition to reach all the joints...
Forum: Framebuilders
02-16-15, 01:45 PM
Replies: 14
Views: 2,083
Posted By BenCooper

Yes, though actually small-wheeled bikes often go...

Yes, though actually small-wheeled bikes often go the other way, with high pressure tyres. Then they have flexibility higher up, with suspension.
Forum: Framebuilders
02-16-15, 02:13 AM
Replies: 14
Views: 2,083
Posted By BenCooper

Stiff forks aren't a bad thing necessarily.

Stiff forks aren't a bad thing necessarily.
Forum: Framebuilders
02-14-15, 02:44 AM
Replies: 14
Views: 2,083
Posted By BenCooper

I cut 55mm off the bottom of the Columbus blades....

I cut 55mm off the bottom of the Columbus blades. Short forks are going to be a lot stiffer than long forks anyhow.
Forum: Framebuilders
02-11-15, 02:50 AM
Replies: 14
Views: 2,083
Posted By BenCooper

I make 16" (349) forks using Columbus SL0I16V1...

I make 16" (349) forks using Columbus SL0I16V1 blades from Ceeway - I chop a bit off the bottom end and use 12mm plug dropouts.
Forum: Framebuilders
02-03-15, 05:42 PM
Replies: 7
Views: 1,479
Posted By BenCooper

Normally one chromes things after they're welded...

Normally one chromes things after they're welded or brazed together.
Forum: Framebuilders
12-19-14, 02:56 PM
Replies: 15
Views: 4,299
Posted By BenCooper

In my experience almost always a lot easier to...

In my experience almost always a lot easier to cut out stuck posts (assuming you've tried the usual twisting methods).
Forum: Framebuilders
12-15-14, 06:23 AM
Replies: 460
Views: 313,090
Posted By BenCooper

I just finished off a tandem recumbent trike: ...

I just finished off a tandem recumbent trike:

423091 423092 423093
Forum: Framebuilders
12-05-14, 11:53 AM
Replies: 4
Views: 1,711
Posted By BenCooper

Yes, I guess we're talking about slightly...

Yes, I guess we're talking about slightly different things - I also fillet braze freehand out of the jig, and often with the odd things I build I have to bodge jigs anyway. But there's a difference...
Forum: Framebuilders
12-04-14, 02:00 PM
Replies: 4
Views: 1,711
Posted By BenCooper

I was taught this way. BB shell in a vice. ST and...

I was taught this way. BB shell in a vice. ST and DT into the BB shell. HT and lower lug on. TT, upper lug and seat lug on. Chainstays on, run a string from dropouts around HT to check back end...
Forum: Framebuilders
11-19-14, 01:32 PM
Replies: 8
Views: 1,137
Posted By BenCooper

I've put disc mounts on the front of the right...

I've put disc mounts on the front of the right leg - it means the braking torque is forcing the axle into the dropout instead of out, it also means that the back of the fork leg is free for rack and...
Forum: Framebuilders
11-14-14, 03:09 PM
Replies: 14
Views: 2,271
Posted By BenCooper

The moisture content of one tubeful of air is...

The moisture content of one tubeful of air is never going to cause any corrosion of note - so sealed tubes will never corrode from the inside. The problem is when more water can get in, and that's...
Forum: Framebuilders
08-29-14, 04:18 PM
Replies: 6
Views: 2,099
Posted By BenCooper

I've heard of people doing it with TIG - MIG is...

I've heard of people doing it with TIG - MIG is hard on thin walls. But why not just tack with brass?
Forum: Framebuilders
08-11-14, 10:32 AM
Replies: 7
Views: 1,402
Posted By BenCooper

What I deal with a lot with couriers is that they...

What I deal with a lot with couriers is that they have an emotional attachment to a particular frame, so a repair is always preferred to a new frame. I had one which needed a complete new bottom...
Forum: Framebuilders
08-11-14, 01:23 AM
Replies: 7
Views: 1,402
Posted By BenCooper

I've repaired courier bikes that way - as long as...

I've repaired courier bikes that way - as long as it's a decent size fillet it's fine, you're turning it from a lugged joint into a filleted joint.
Forum: Framebuilders
08-02-14, 02:03 PM
Replies: 14
Views: 5,628
Posted By BenCooper

I wouldn't just fill it with brass, but a...

I wouldn't just fill it with brass, but a brazed-on patch would be strong enough - though not so good aesthetically.

i do quite a few patches on courier bikes, they get beaten up and can't afford...
Forum: Framebuilders
05-24-14, 01:22 AM
Replies: 1
Views: 1,066
Posted By BenCooper

A sharp knife is the easiest way on small areas...

A sharp knife is the easiest way on small areas like that.
Forum: Framebuilders
04-30-14, 05:23 PM
Replies: 14
Views: 7,626
Posted By BenCooper

Do you have a laser cutting company near you? My...

Do you have a laser cutting company near you? My first IS jigs were simple plate ones cut out of stainless sheet - I go them for about £10 each from Hope, but not sure if they still make them.

Or...
Forum: Framebuilders
04-19-14, 04:25 PM
Replies: 15
Views: 5,942
Posted By BenCooper

The issue to be aware of is ovalisation - with no...

The issue to be aware of is ovalisation - with no reinforcement and the heat put in with filleting, you can end up with an ovalised head tube which causes problems after reaming. But it depends on...
Forum: Framebuilders
04-17-14, 01:21 AM
Replies: 13
Views: 3,854
Posted By BenCooper

Building a frame, there are different ways of...

Building a frame, there are different ways of doing it - some people put the couplings in a plain tube first, others (like me) build the frame, then cut it in half to fit the couplings. I suppose you...
Forum: Framebuilders
04-16-14, 04:03 PM
Replies: 13
Views: 3,854
Posted By BenCooper

Retrofitting S&S couplings is a good way to see...

Retrofitting S&S couplings is a good way to see how much stress there is in frames - I've seen the full range, from frames that don't move at all, to ones that move a whole tube diameter or more.
Forum: Framebuilders
03-20-14, 05:04 PM
Replies: 13
Views: 3,854
Posted By BenCooper

I don't normally cold-set anything - tack in the...

I don't normally cold-set anything - tack in the jig, then fillet-braze each joint in a sequence that evens out how the frame moves. Occasionally I need to tweak the dropout spacing slightly after...
Forum: Framebuilders
02-24-14, 06:49 PM
Replies: 19
Views: 2,524
Posted By BenCooper

I've seen a few decent bamboo ones - the single...

I've seen a few decent bamboo ones - the single main tube makes it pretty simple. There have also been a bunch made from flat aluminium plate cut to shape to make a box section. Plywood has also been...
Forum: Framebuilders
12-31-13, 11:38 AM
Replies: 6
Views: 1,437
Posted By BenCooper

It is, I believe, a rule of thumb based on the...

It is, I believe, a rule of thumb based on the comparative tensile strengths of steel and brass. Obviously they both vary a lot, so not that useful a rule.

I've never seen a frame fail through a...
Forum: Framebuilders
12-26-13, 03:21 AM
Replies: 8
Views: 2,813
Posted By BenCooper

I make lots - but for 16" wheels. If it was for...

I make lots - but for 16" wheels. If it was for larger wheels, I'd keep the blades straight and use the Paragon extended disc mount or something similar, but only really for road use.
Forum: Framebuilders
12-19-13, 05:00 PM
Replies: 3
Views: 3,861
Posted By BenCooper

Ah, an older Birdy. If it was me, I'd tap the...

Ah, an older Birdy. If it was me, I'd tap the hole to 6mm (it's 5mm at the moment isn't it?) and use a larger bolt, perhaps with the bolt head filed down a bit. That should still work fine with the...
Forum: Framebuilders
11-20-13, 05:33 PM
Replies: 14
Views: 3,342
Posted By BenCooper

Not really any different to fillet-brazing a...

Not really any different to fillet-brazing a non-lugged bottom bracket. I've never had durability problems.
Forum: Framebuilders
11-20-13, 02:52 AM
Replies: 14
Views: 3,342
Posted By BenCooper

I do that with jobs I really don't want to do....

I do that with jobs I really don't want to do. Problem is sometimes people accept the quote ;-)
Forum: Framebuilders
11-19-13, 12:21 PM
Replies: 14
Views: 3,342
Posted By BenCooper

I've repaired things like that - either with a...

I've repaired things like that - either with a fillet or by replacing the shell. It's never economic, but sometimes people want to do it for sentimental reasons.
Forum: Framebuilders
10-17-13, 02:08 AM
Replies: 13
Views: 12,317
Posted By BenCooper

Pushing them out from the inside would be very...

Pushing them out from the inside would be very tricky on anything other than the seat tube. Tube blocks can be surprisingly effective - or of course you can just fill the dent with brass or car body...
Forum: Framebuilders
10-13-13, 10:53 AM
Replies: 23
Views: 4,119
Posted By BenCooper

With S&S frames, I usually find it a lot simpler...

With S&S frames, I usually find it a lot simpler to make the frame, then cut it in half to fit the couplings. That way it's easier get everything to line up.
Forum: Framebuilders
10-03-13, 05:31 PM
Replies: 3
Views: 914
Posted By BenCooper

Just had a look through, it doesn't seem to be...

Just had a look through, it doesn't seem to be something I've ever bothered photographing. On things like Bromptons I put them in the conventional location, because of how it folds.
Forum: Framebuilders
10-03-13, 11:22 AM
Replies: 3
Views: 914
Posted By BenCooper

I've built a reasonable number of bikes with the...

I've built a reasonable number of bikes with the caliper on the front of the right leg, for exactly those reasons.
Forum: Framebuilders
09-19-13, 01:58 AM
Replies: 23
Views: 4,119
Posted By BenCooper

Yes, butted tubes have a long butt and a short...

Yes, butted tubes have a long butt and a short butt - you cut the end with the long butt. Otherwise you'd have no idea where the butt was.

Hacksaws are fine for cutting tubes - and I mitre with...
Forum: Framebuilders
09-17-13, 01:43 AM
Replies: 23
Views: 4,119
Posted By BenCooper

You really need to work out a few more numbers,...

You really need to work out a few more numbers, as it also depends on the angle between the tubes of course. How are you designing your frame? If it's on layout paper, you can just draw the tubes on...
Forum: Framebuilders
09-15-13, 10:10 AM
Replies: 6
Views: 2,363
Posted By BenCooper

Dropouts are easy - just heat up and pull. I do...

Dropouts are easy - just heat up and pull. I do it with some locking pliers clamped to the dropout, and I do the chainstay joint first - the seatstays are flexier, so easier to pop the CS joint out....
Forum: Framebuilders
09-03-13, 04:42 PM
Replies: 14
Views: 2,232
Posted By BenCooper

Learning how to braze takes 15 minutes. Learning...

Learning how to braze takes 15 minutes. Learning how to braze well has taken me 20 years so far. I first learned at a college evening class, then bought the kit and practiced at home.
Forum: Framebuilders
08-29-13, 02:13 AM
Replies: 15
Views: 3,593
Posted By BenCooper

Looks like you had basically no fillet there, so...

Looks like you had basically no fillet there, so very little contact area - even with perfect braze penetration, a butt joint isn't strong enough for joining tubes.

It sounds as if you didn't have...
Forum: Framebuilders
08-24-13, 03:11 AM
Replies: 7
Views: 1,374
Posted By BenCooper

A 1/2" crack is pretty big - well, any crack is...

A 1/2" crack is pretty big - well, any crack is bad, but that's quite a lot. However it's in a relatively unstressed part of the frame. I'd leave it completely alone and monitor it closely, if you're...
Forum: Framebuilders
08-14-13, 04:09 PM
Replies: 10
Views: 2,782
Posted By BenCooper

Depends on your bender I suppose - I always braze...

Depends on your bender I suppose - I always braze ends in first, and with the Hammill bender I use I don't get a straight section at the end. Never use sand.
Forum: Framebuilders
07-17-13, 05:16 PM
Replies: 4
Views: 3,125
Posted By BenCooper

I use a device I call the Dingus, made out of a...

I use a device I call the Dingus, made out of a ball joint splitter.
Showing results 1 to 50 of 66
 
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