Titanium cogs spark when shifting

Marty Wallace said:

Quoted message said:

almost fast aka Real Slow said:

I was watching the shifts on the trainer and noticed a
spark when the chain snapped past a tooth. Cog is
titanium (Dura-Ace 9s). Kinda cool!

Well the sparks didn't come from the titanium.
Adjustable and fixed wrenches, screwdrivers, and other
tools used around combustible gas applications are made
of titanium to prevent ignition by sparks.

There is an explanation, but titanium sparking is out.

Jobst Brandt [email hidden]

Quoted message said:

We use non-sparking tools for working with hydrogen but
they have a bronze colour. They're definitely much harder
and stronger than bronze. Are you sure the titanium isn't
alloyed with something to take the spark out of it?

Of course they are alloyed, just as titanium frames or
stainless steel
is. Yes the tools I used were that color you describe most
certainly. As I said, the people who use these know
why and are not going to come to this forum to learn
more about it.

Jobst Brandt [email hidden]

On Mon, 31 May 2004 20:54:48 GMT, [email hidden]

Quoted message said:

almost fast aka Real Slow said:

I was watching the shifts on the trainer and noticed a
spark when the chain snapped past a tooth. Cog is
titanium (Dura-Ace 9s). Kinda cool!

Well the sparks didn't come from the titanium. Adjustable
and fixed wrenches, screwdrivers, and other tools used
around combustible gas applications are made of titanium to
prevent ignition by sparks.

There is an explanation, but titanium sparking is out.

Jobst Brandt [email hidden]

I've sand blasted titanium with the lights out. Spark
shower!!!

You don't have to take my word for it -- try it with the
next chunk of unneeded ti you come across (a worn out Dura-
Ace cassette perhaps?).

Maybe he just farted......................

On 5/31/04 1:54 PM, in article
[email hidden],
"[email hidden]"

Quoted message said:

almost fast aka Real Slow said:

I was watching the shifts on the trainer and noticed a
spark when the chain snapped past a tooth. Cog is
titanium (Dura-Ace 9s). Kinda cool!

Well the sparks didn't come from the titanium. Adjustable
and fixed wrenches, screwdrivers, and other tools used
around combustible gas applications are made of titanium
to prevent ignition by sparks.

There is an explanation, but titanium sparking is out.

Jobst Brandt [email hidden]

dianne_1234 said:

I've sand blasted titanium with the lights out. Spark
shower!!!

You don't have to take my word for it -- try it with the
next chunk of unneeded ti you come across (a worn out Dura-
Ace cassette perhaps?).

Is that the titanium or the blasting material doing
the sparking?

<[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Marty Wallace said:

Quoted message said:

almost fast aka Real Slow writes:

> I was watching the shifts on the trainer and noticed
> a spark when

the

Quoted message said:

Quoted message said:

Quoted message said:

> chain snapped past a tooth. Cog is titanium (Dura-
> Ace 9s). Kinda

cool!

Quoted message said:

Quoted message said:

Quoted message said:

Well the sparks didn't come from the titanium.
Adjustable and fixed wrenches, screwdrivers, and other
tools used around combustible gas applications are
made of titanium to prevent ignition by sparks.

There is an explanation, but titanium sparking is out.

Jobst Brandt [email hidden]

Quoted message said:

We use non-sparking tools for working with hydrogen but
they have a bronze colour. They're definitely much
harder and stronger than bronze. Are you sure the
titanium isn't alloyed with something to take the spark
out of it?

Of course they are alloyed, just as titanium frames or
stainless steel
is. Yes the tools I used were that color you describe
most certainly. As I said, the people who use these
know why and are not going to come to this forum to
learn more about it.

Ahh, very true. Busy people those. On the other hand, they
might come here to find out why the hell their Dura-Ace 9
speed ti cogs keep sparkin' like that... 😉

[email hidden] wrote in:

Quoted message said:

Allen None said:

Otherwise, somebodies a'gittin ripped off buying
these...

sportsbikeshop.co.ukcontenOpen ↗
t_prod/18/208

I suspect that the term titanium is in that product name
to give it a lively spin rather than that the devices
are actually titanium. On the other hand, it seems the
sparks must be coming from the pavement rather than the
metal if at all.

No, it's the titanium. It sparks much more brightly than
steel when abraded. Hence "Fire Starter" freestyle axle
pegs: bmx-test.comcgiOpen ↗
bin/reviews.cgi?review_id=2070

The nonferrous, nonsparking tools I've seen are all beryllium-
copper: bestcontainers.com5001b.htmlOpen ↗

To be certain, I just took a strip of 6Al/4V titanium to the
bench grinder and produced my own cascade of brilliant white
sparks. Now I have to figure out how to incorporate this
feature into one of my own bikes!

Chalo Colina

Chalo said:

Quoted message said:

I suspect that the term titanium is in that product name
to give it a lively spin rather than that the devices are
actually titanium. On the other hand, it seems the sparks
must be coming from the pavement rather than the metal if
at all.

Quoted message said:

No, it's the titanium. It sparks much more brightly
than steel when abraded. Hence "Fire Starter" freestyle
axle pegs:

Quoted message said:

bmx-test.comreviews.cgiOpen ↗

Quoted message said:

The nonferrous, non-sparking tools I've seen are all
beryllium-copper:

Quoted message said:

bestcontainers.com5001b.htmlOpen ↗

Oops, you are absolutely right. The tools I used on the
hydrogen plumbing were in fact beryllium alloys. I got
beryllium confused with titanium which is also a whiz bang
name drop material in bicycling. In fact some early race car
brake disks were beryllium to save weight but that all went
by the wayside with carbon on carbon brakes that leave no
residue, the product being CO2.

However, both beryllium and titanium are combustible
according to the following web page although spark
generation is not treated.

tinyurl.com2637yOpen ↗

Jobst Brandt [email hidden]

Quoted message said:

However, both beryllium and titanium are combustible
according to the following web page although spark
generation is not treated.

tinyurl.com2637yOpen ↗

Beryllium metal is horrible stuff, exhibiting lethal
toxicity in a portion of the population at low exposure
dosages. More folks in the Manhattan Project died from
exposure to beryllium, IIRC, than from exposure to radiation
or radioactive materials.

The beryllium copper I have worked in the past (C17200) is
composed of only 2% beryllium by weight, and its
mechanical and thermal qualities are comparable to (though
usually better than) other high-strength bronze materials.
I think it would share similar flammability
characteristics with them as well, with its 97% or so of
copper predominating the mix.

Chalo Colina

From: [email hidden] (almost=A0fast)

Quoted message said:

I was watching the shifts on the trainer and noticed a
spark when the chain snapped past a tooth. Cog is titanium
(Dura-Ace 9s). Kinda cool!

Just make sure you don't have any magnesiun componentry in
the area! LOL.

- -

"May you have the wind at your back. And a really low gear
for the hills!"

Chris Zacho ~ "Your Friendly Neighborhood Wheelman"

Chris'Z Corner geocities.comczcornerOpen ↗

On Mon, 31 May 2004 20:54:48 GMT [email hidden]

Quoted message said:

almost fast aka Real Slow said:

I was watching the shifts on the trainer and noticed a
spark when the chain snapped past a tooth. Cog is
titanium (Dura-Ace 9s). Kinda cool!

Well the sparks didn't come from the titanium. Adjustable
and fixed wrenches, screwdrivers, and other tools used
around combustible gas applications are made of titanium to
prevent ignition by sparks.

Perhaps you're thinking of berilium copper tools. There
would be no reason to have non-sparking tools around an
accelerator, but the target area might well have a
hydrogen bubble chamber which might well be a good place
for such tools.

Quoted message said:

There is an explanation, but titanium sparking is out.

Never seen titanium spark? It does readily when it is clean,
but usually forms an oxide/nitride layer rather quickly on
exposure to air. Titanium is unique in that it is the only
metal which will "burn" in both oxygen and nitrogen.

Titanium sparks from a grinding wheel are useful for
identifying the metal.

While I'd be surprised to see sparks in the situation
described, they are certainly within the realm of
possibility.

-
-----------------------------------------------
Jim Adney [email hidden] Madison, WI 53711 USA
-----------------------------------------------

31 May 2004 20:46:07 -0700 Dan Daniel said:

Is that the titanium or the blasting material doing the
sparking?

It's actually the titanium. I've watched it spark and
actually burn when cleaning out vacuum chambers which had
been coated with a thin flakes of pure titanium from
titanium getter pumps.

The fireworks start when you let the chamber up to air
and then try to brush the flakes out to clean off the
chamber walls.

-
-----------------------------------------------
Jim Adney [email hidden] Madison, WI 53711 USA
-----------------------------------------------