The only Rivendell related example of this I'm aware of is the Nitto TFL
threadless stem from around 2006. Tigged, fillet brazed and lugged.
The TIG welding is at the back, where the clamp screw goes. The other
two are obvious.
On 03/23/2018 01:46 PM, Kainalu V. wrote:
"BUT.... When done, they will go to the expense and trouble of
covering those tig welds with a fillet, making them both stronger and
more beautiful than a lugged shell!"
Is that in fact the case? Covering tig welds with a brass fillet? I
assumed it would be more like a tigged front triangle with brass in
the back. I know that some builders use electric welding of one type
or another to tack tubes together before coming in with a torch an
filleting it up, but that process is bemoaned by frame repair folks
who'd rather deal with one type of mess to clean up at a time when
dealing with a repair. Not that you'd ever need to, but maybe...
Not that it matters, 62 is a bit small for the likes of me
-Kai
BK NY
On Friday, March 23, 2018 at 1:06:19 PM UTC-4, iamkeith wrote:
On Thursday, March 22, 2018 at 10:31:15 PM UTC-6, Dave Small wrote:
I've been out on a 6-day tour and mostly offline, and got home
today to the Blug and this 128-post (as I type) string. I've
just read through 'em all and Scott is the only one who's
broached the thing I latched onto when I read the Blug: What
is a "combo tig-fillet BB shell?" Does anyone know? I'm as
happy with fillet-brazed as I am with lugged, but I'm not
enamored with TIG.
Dave,
I don't think there's any mystery here. Sounds like the bb shell
will be tigged in. As others noted, this would eliminate having
to have different castings for /each/ frame size. Otherwise, each
wheel size would have a different drop dimension and, even in
frames with the same wheel size, proportional chainstay lengths
would require the angle of the sockets to be different in to
maintain that drop dimension. And the downtube angles are
different on each frame size anyway.
It also allows them to ovalize or baseball-batt the bottom of the
seat tube as the Blug description alludes to, and like the Roadini
did. I don't know enough to understand the benefit of that -
whether it ends up being stronger by increasing weld length, or if
it's easier because it eliminates some tricky copes, or both. The
rear dropouts are similar.
BUT.... When done, they will go to the expense and trouble of
covering those tig welds with a fillet, making them both stronger
and more beautiful than a lugged shell!
As I mentioned above, I can't imagine how this would yield a
savings from a labor standpoint. It requires more skill, multiple
steps, and a third fabrication process. So I assume that the
main benefit is that it allows them to get a design to market
sooner, with more design flexibility.
The only downside I can see is that it would be hard to replace a
damaged tube in the event of an accident. But how often does that
happen in practice? Rivendells are lifetime frames for most
people, but I'm still guessing that replace-ability is usually
more of a theoretical benefit.
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