However much I don't believe that total uni has drilled titanium (just
as I don't believe he made 5 10" bc wheels in 1 day), I will agree with
him that tianium is far more difficult to drill through than most alloys
of steel, including 4130 chromoly. Titanium will go through 1 good grade
end mill every few minutes of cutting. The density of a material is
irrelevant. Lead is extremely easy to cut, but it's far denser than
steel. Titanium is extremely hard and not readily machined. It has the
tendency to rip little bits of the cutting edge off of the bit, rapidly
dulling it. In addition, it can be known to micro-weld it'sself to the
bit, dulling the bit even further. Most likely what happeed was total
uni was either cutting way to fast, as digitalattrition said, or he was
running the bit at too high rpms, or a combo of the two. He also
could've been drilling without any cutting fluid, which isn't the wisest
of things.
I don't believe that was 4130 chromoly on that BC wheel, since it was so
rusted.
Catboy: Don't be stupid. Noone ever has, or ever will say that harper's
hub at CMW is or was stronger than a profile hub (that wasn't the idea,
anyways. Steve just wanted to see how much it would take to break or
bend something in the drivetrain. If it was something small, then it
wouldn't be strong enough, but if it were big, then it would be
acceptable). That was something you made up by yourself. That hub was
clearly weaker than profiles, and Steve never expected it to be any
stronger. Ryan did multiple drops of that size on the Tahoe Rim trail on
his muni, and he never warped his axle. He cracked his right crank on
the 3rd or fourth try, but it never broke. If the harper's hub were
stronger than profiles, than the kooka cranks would've broken long
before the axle warped.
Also, I'm soon to be riding a profile hub that's made of the same grade
of stainless as harper's and after talking to Steve, who tried it at
moab, he said it definitely was strong, but not quite as much so as
profiles. To repeat myself, my point is that the hub harper rode at CMW
was not anywhere near stronger than profiles. Noone but you ever claimed
it was.
Hey Robbie, there's no reason to bother challenging everyone who builds
unicycles to build a hub and crankset Ryan can't break. Everything will
break eventually. Something that weighs 6 lbs but won't break is
pointless. Profile cranks are plenty strong. More to the point, profiles
have a warranty, which beats everything else. People who ride as hard as
Ryan will break everything, so it's just a question of whether they last
a reasonable amount of time before hand, and if they have a warranty.
--
gerblefranklin - Trials Unicyclist
Don't you think it's a cruel irony that acting like a G.I. Joe in the
army can get you a Medal, while playing with one can get you thrown
out?
http://gallery.unicyclist.com/Trials-Muni
"Our enemies are innovative and resourceful. They will stop at nothing
to hurt us and our people, and nethier will we"-Dubya
Vote Kerry. Yeah, they both suck, but Kerry sucks less.
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Now stop with the aircraft grade metallic lies your