Search: Posts Made By: Falanx
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Forum: Framebuilders
05-10-13, 02:39 AM
Replies: 9
Views: 1,289
Posted By Falanx

Soda. Always, always soda. It is astoundingly...

Soda. Always, always soda. It is astoundingly forgiving, and the residue washes away wonderfully :-)
Forum: Framebuilders
05-10-13, 02:38 AM
Replies: 12
Views: 8,099
Posted By Falanx

So here comes one to help out with understanding...

So here comes one to help out with understanding :-)

As a general rule, steel frames undergo no heat-treatment post-manufacture as already noted by my esteemed peers, but there are always...
Forum: Framebuilders
03-18-13, 01:04 AM
Replies: 11
Views: 1,090
Posted By Falanx

http://www.titanium-brazing.com/publications/DVS-M...

http://www.titanium-brazing.com/publications/DVS-Manuscript_1020-Copy2-19-07.pdf

Lays out the advances fairly well.
Forum: Framebuilders
03-18-13, 12:57 AM
Replies: 6
Views: 5,083
Posted By Falanx

The bike is British, or for sale in the British...

The bike is British, or for sale in the British market and 6102 is the British Standard governing bicycle frames. It makes no reference to individual alloys. The sticker's just a bodge informing the...
Forum: Framebuilders
03-09-13, 02:18 AM
Replies: 23
Views: 1,760
Posted By Falanx

\m/ That is all

\m/


That is all
Forum: Framebuilders
03-08-13, 04:44 PM
Replies: 23
Views: 1,760
Posted By Falanx

Blame Procurement for the Titanic. The ********...

Blame Procurement for the Titanic. The ******** bought pig-iron, the steel was so dirty.

Otherwise Mark's spot on. As is Frank on handling :-)
Forum: Framebuilders
01-31-13, 06:13 AM
Replies: 14
Views: 2,904
Posted By Falanx

I did say that earlier :-p

I did say that earlier :-p
Forum: Framebuilders
01-31-13, 04:11 AM
Replies: 14
Views: 1,116
Posted By Falanx

First you aren't *tempering* 6061. Second, it...

First you aren't *tempering* 6061. Second, it needs to be a lot warmer than boiling water for aging 6xxx series. Third, I doubt tapwater in your area is clean anough to allow you to boil aluminium in...
Forum: Framebuilders
01-23-13, 04:11 AM
Replies: 22
Views: 1,379
Posted By Falanx

You can't account for the gross and spectacular...

You can't account for the gross and spectacular stupidity of lawmakers, especially when they understand even less than the supposedly green lobby who have worked long and hard to have their ear.
...
Forum: Framebuilders
01-22-13, 02:16 AM
Replies: 22
Views: 1,379
Posted By Falanx

Just be aware that borax will start to be...

Just be aware that borax will start to be controlled in the EU with knock-on effects your side of the pond. Thanks to some ******* who fed it by the kilo (!) to dogs and noticed some effects on their...
Forum: Framebuilders
12-19-12, 07:08 AM
Replies: 14
Views: 2,904
Posted By Falanx

Absolutely. 953 is only ~10% nickel, so the 75%...

Absolutely. 953 is only ~10% nickel, so the 75% iron in the alloy is the source of most of the energy product. My statement concerned the crystallography, not the composition of the steel.
Forum: Framebuilders
12-05-12, 12:45 PM
Replies: 27
Views: 1,575
Posted By Falanx

Consider me chastened. All marketed structural...

Consider me chastened. All marketed structural epoxies are aromatic in nature and fail before 0.2% yielding. I'm not under any impression at all. That is the very definition of brittle. All the same,...
Forum: Framebuilders
12-05-12, 08:21 AM
Replies: 27
Views: 1,575
Posted By Falanx

I don't care whether or not you disagree, it...

I don't care whether or not you disagree, it does. This isn't a matter of opinion, it's a matter of materials mechanics fact. You've added an inherently brittle material - epoxy - to a naturally...
Forum: Framebuilders
12-05-12, 04:24 AM
Replies: 27
Views: 1,575
Posted By Falanx

I'm not saying it's totally useless, but it's not...

I'm not saying it's totally useless, but it's not really applicable to this application - for damage tolerance of freestanding cantilevered structures maybe, it's quite relevant.

Fatigue will be...
Forum: Framebuilders
12-05-12, 03:15 AM
Replies: 27
Views: 1,575
Posted By Falanx

Wow, impressive. What's the wall thickness like,...

Wow, impressive. What's the wall thickness like, and what wood and epoxy impregnation have you used?




It's not impact strength, either, which is another parameter.

This strength,...
Forum: Framebuilders
12-04-12, 07:25 AM
Replies: 27
Views: 1,575
Posted By Falanx

That's not toughness. In fact, it's the opposite...

That's not toughness. In fact, it's the opposite of it. Toughness is the ability of a material to undergo plastic work to prevent failure, not the resistance to deformation, and it is quantified by...
Forum: Framebuilders
12-04-12, 07:22 AM
Replies: 27
Views: 1,575
Posted By Falanx

Wooden 'tube'?. Do you mean 'bar'?

Wooden 'tube'?. Do you mean 'bar'?
Forum: Framebuilders
12-04-12, 03:17 AM
Replies: 27
Views: 1,575
Posted By Falanx

Also, for reference, those thoughnesse values are...

Also, for reference, those thoughnesse values are on smooth, non-notched specimens, unlike most engineering metals, which suffer either Izod or Charpy impact tests on sharply notched specimens.
Forum: Framebuilders
12-04-12, 03:15 AM
Replies: 27
Views: 1,575
Posted By Falanx

I came to this thread expecting somethign very...

I came to this thread expecting somethign very different...
Forum: Framebuilders
12-03-12, 02:40 AM
Replies: 14
Views: 2,904
Posted By Falanx

Yep, seen it done. You pour out enough LOX into...

Yep, seen it done. You pour out enough LOX into a boiling tube to chill and fill it, so there's no losses, suspended from something like a bench clamp with a bit of string and bring a strong...
Forum: Framebuilders
12-01-12, 12:33 PM
Replies: 14
Views: 2,904
Posted By Falanx

Iron, nickel, cobalt and gadolinium are the four...

Iron, nickel, cobalt and gadolinium are the four elements that are ferromagnetic at room temperature. Bear in mind that paramagnetic materials can be attracted to a magnet, too, and there's bloody...
Forum: Framebuilders
11-17-12, 05:40 PM
Replies: 4
Views: 8,725
Posted By Falanx

It's crap. E-coat, even in the car industry, is...

It's crap. E-coat, even in the car industry, is piss-awful as a standalone anticorrosion protection and only exists at all because its marketed by either the same companies that make paint for cars,...
Forum: Framebuilders
11-17-12, 04:15 PM
Replies: 6
Views: 835
Posted By Falanx

I was always of the understanding that GT used...

I was always of the understanding that GT used polymer beads. I stand corrected. In which case, they must have been some pretty bloody expensive BBs to have the minimum silky smooth polish not to...
Forum: Framebuilders
11-17-12, 04:08 PM
Replies: 28
Views: 11,970
Posted By Falanx

Iron silicate is liquid at welding temperatures,...

Iron silicate is liquid at welding temperatures, that's kinda what I'm getting at - silicon dissolves into the oxide and fluxes it sufficiently that even with about 20% chromium substituted for iron,...
Forum: Framebuilders
11-11-12, 02:55 AM
Replies: 28
Views: 11,970
Posted By Falanx

hat's what I'm here for.

hat's what I'm here for.
Forum: Framebuilders
11-10-12, 02:10 PM
Replies: 28
Views: 11,970
Posted By Falanx

The silicon helps break the oxide film on...

The silicon helps break the oxide film on stainless steels, which is why they're usually such a pain in the ass to joint with certain other filler metals.
Forum: Framebuilders
11-10-12, 03:17 AM
Replies: 28
Views: 11,970
Posted By Falanx

That's gone down really nicely *salutes*

That's gone down really nicely *salutes*
Forum: Framebuilders
11-09-12, 09:46 AM
Replies: 28
Views: 11,970
Posted By Falanx

You mean like the rest of the world does? It's...

You mean like the rest of the world does? It's nickel bronze to us :-D



All copper alloys are called bronzes, unless they contain more than 10% zinc. The principle is the same as iron alloys...
Forum: Framebuilders
10-31-12, 09:35 AM
Replies: 28
Views: 11,970
Posted By Falanx

If it's dissimilar filler used then it's...

If it's dissimilar filler used then it's *brazing*, end of :-p

There's no physical reason why you can't use a dissimilar filler method with a arc torch, after all, it's just an alternative heat...
Forum: Framebuilders
10-31-12, 09:33 AM
Replies: 6
Views: 835
Posted By Falanx

Really? We're still at that old chestnut? Shaving...

Really? We're still at that old chestnut? Shaving a hundred grammes off a frame while the rider piles on the pounds?

That's not entirely true. GT used to plastic ball bead burnish their frames,...
Forum: Framebuilders
10-27-12, 10:57 AM
Replies: 22
Views: 1,223
Posted By Falanx

With all dissimilar adhesives - filler metal for...

With all dissimilar adhesives - filler metal for brazing included - the thinnest layer with complete wetting is the strongest. The statistical likelihood of a critical defect decreases linearly with...
Forum: Framebuilders
10-27-12, 06:40 AM
Replies: 22
Views: 1,223
Posted By Falanx

And, unless he's either casting them himself from...

And, unless he's either casting them himself from remelt scrap, or welding them and fettling, he's not using 304. That's a forged composition. The nearest equivalent has different alloying limits and...
Forum: Framebuilders
10-27-12, 06:39 AM
Replies: 22
Views: 1,223
Posted By Falanx

I thought he was referring to both of us and...

I thought he was referring to both of us and getting us confused...
Forum: Framebuilders
10-27-12, 01:52 AM
Replies: 22
Views: 1,223
Posted By Falanx

Er, I don't think so. And I didn't say I had...

Er, I don't think so.

And I didn't say I had all of them, I was just hoping one or two people could point me towards any knowledge they had of lug materials, and glues other than heinously...
Forum: Framebuilders
10-26-12, 01:38 PM
Replies: 22
Views: 1,223
Posted By Falanx

There's not that many standard alloys for casting...

There's not that many standard alloys for casting stainless. And they're not the same alloys as tubing specs. Non stainless can be alloy, can be plain carbon manganese. I guess the only way to find...
Forum: Framebuilders
10-23-12, 03:19 AM
Replies: 12
Views: 1,045
Posted By Falanx

Laminated cardboard.... Is that not essentialyl...

Laminated cardboard.... Is that not essentialyl just MDF? ;-)
Forum: Framebuilders
10-21-12, 02:21 PM
Replies: 9
Views: 982
Posted By Falanx

Just find a suitable filled two-pack epoxy and...

Just find a suitable filled two-pack epoxy and bond it on. Clamp it to the steel tube surface by popping a small g-clamp over it and wait 'til it's cured.

The actual load on cablestops is tiny.
Forum: Framebuilders
10-20-12, 08:04 AM
Replies: 22
Views: 1,223
Posted By Falanx

With the strength of single-part thermally...

With the strength of single-part thermally activated epoxies available, not really :-) You'd already have the tube-to-tube jointing surface area at the mitre, and the area under the lug. The lugs...
Forum: Framebuilders
10-20-12, 01:27 AM
Replies: 22
Views: 1,223
Posted By Falanx

Reviving the Dynatech. Or something :-D

Yes, I know it's lunacy. Yes, I know it's not the done think to purists who have made some beautiful brazed, welded and silver soldered frames with and without lugs, but I'm feeling kinda...
Forum: Framebuilders
10-13-12, 01:42 AM
Replies: 1
Views: 637
Posted By Falanx

It's juicier, and goes better with lemon.

It's juicier, and goes better with lemon.
Forum: Framebuilders
09-20-12, 02:32 PM
Replies: 25
Views: 1,736
Posted By Falanx

Sell the steel as identified alloy, with...

Sell the steel as identified alloy, with surcharges, to a reputable scrap dealer.
Forum: Framebuilders
09-12-12, 01:51 PM
Replies: 3
Views: 1,483
Posted By Falanx

Unfortunately the only colour that works bridging...

Unfortunately the only colour that works bridging BRG and white is gold.
Forum: Framebuilders
09-12-12, 01:50 PM
Replies: 8
Views: 663
Posted By Falanx

'Lugs' was perhaps the wrong word, but in...

'Lugs' was perhaps the wrong word, but in principle that's as close as I could describe them.

304's only strengthened by cold work, and deep-freezing and cold work, both of which are undone by the...
Forum: Framebuilders
09-11-12, 04:19 AM
Replies: 8
Views: 663
Posted By Falanx

I'll see what I can find :-) If you're going...

I'll see what I can find :-)

If you're going to essentially make lugs - what are you doing about the BB shell?
Forum: Framebuilders
09-10-12, 12:22 PM
Replies: 8
Views: 663
Posted By Falanx

If you're looking to prefab a lug-like assembly,...

If you're looking to prefab a lug-like assembly, then ferritic isn't the way to go. Its grain growth is bloody horrendous with multiple heat inputs. You're better off with cast stainless lugs. Or...
Forum: Framebuilders
09-09-12, 11:38 PM
Replies: 8
Views: 663
Posted By Falanx

What's the application?

What's the application?
Forum: Framebuilders
09-08-12, 12:30 AM
Replies: 25
Views: 1,736
Posted By Falanx

What Unterhausen is saying is that price is...

What Unterhausen is saying is that price is irrelevant, corners were cut in the heyday of pathological bicycle demand, just as they always have been with the car industry (even more, ironically, now,...
Forum: Framebuilders
09-07-12, 12:26 AM
Replies: 25
Views: 1,736
Posted By Falanx

I'd have agreed on the extended lug design...

I'd have agreed on the extended lug design theory, until I saw 009.jpg. If that's two pieces of metal butted and badly welded, the root of what appears to be the crack is the end of a shoddy...
Forum: Framebuilders
09-02-12, 11:44 PM
Replies: 15
Views: 1,482
Posted By Falanx

Not to any meaningful degree. And. ...

Not to any meaningful degree.

And.

Really? I can see that being an absolute nightmare to draw.
Forum: Framebuilders
09-02-12, 11:43 PM
Replies: 15
Views: 1,482
Posted By Falanx

I know what you meant :-)

I know what you meant :-)
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