Building in 3D

I guess we shouldn't be surprised.

On Friday, I wrote about a 3D printed airless tire.  When I learned about it, I knew that other 3D printed parts were being made somewhere. 

Turns out, I underestimated the speed of technological progress.  Now there's a 3D printed bicycle that looks like a sci-fi version of an urban commuter bike--and is said to be stronger than titanium.

The new machine was made by Arevo, a Silcon Valley (where else?) startup that specializes in "additive manufacturing" (tech-speak for engineering-level 3D printing).  The company is backed by the venture capital arm of the Central Intelligence Agency, which isn't surprising when you realize that the armed forces are the main drivers behind 3D's evolution from a novel way to make chintzy plastic figurines to a sophisticated technological process used to make weaponry.

(Few people realize that the Silicon Valley became, well, the Silicon Valley largely because of military contracts during the Cold War.  So, if you're going to thank a soldier or sailor for anything, make sure it's for making the iPhone possible, not for invading Iraq!)

The bicycle's frame was made first, as a single piece, and the other parts were made.  According to Arevo CEO Jim Miller (formerly of Google), it took about two weeks to make the bike.  

Knowing that answers the question folks like me ask about carbon fiber bicycles: "Why does something made of plastic cost so much?"  Well, carbon bike frames--whether of custom chassis from the likes of Land Shark or the Specialized items your local bike shop offers--are made by workers who lay, by hand, individual layers of carbon fiber impregnated with resin around a mold of a frame.  The frame is then baked in an oven to melt the resin and bind the carbon strips together.

Arevo takes workers out of the process.  It uses a "deposition head" on a robotic arm to print out the three-dimensional shape of the frame.  The head then lays down strands of carbon fiber and melts a thermoplastic material to bind the strands, all in one step.   The result is that Arevo can build a frame for $300, even in The Valley.  That is about what it currently costs to build a similar frame in Asia.

Of course, even though Miller is reportedly a cyclist, he doesn't see Arevo as the next Schwinn or Trek or Specialized:  The company is working on a head that can run along rails and print larger parts, avoiding the need of ovens in which to bake them.  "We can print as big as you want--the fuselage of an aircraft, the wing of an aircraft," he says.

Surely he knows the Wright Brothers started as bicycle builders...

A Robin Hood Of Public Health?

I am a terrible person:  I just laughed at the misfortune of someone else.

Actually, I was laughing about the way that person came about her misfortune, and somewhat in approval about the person who brought it to her.

What disaster befell her?  Well, she was sitting in a Honolulu bus stop Wednesday morning.  A man approached on a bicycle.  

He tried to snatch a carton of cigarettes from her hand.  She held on, but he overpowered her and snatched it away.  That caused her to fall on his bicycle and hurt her knees.

Now, given the way he robbed her--and the fact that he is 25 and she is 62--the police had reason to arrest him.  But he wasn't charged with assault or any other kind of crime against a person.  Instead, he was arrested on "suspicion of second-degree robbery."

Of course he was wrong to use force in an attempt to rob that woman.  I can't help but to wonder, though, whether things would have been different had he destroyed those cigarettes.  I mean, a cyclist taking away someone's cigarettes:  If that doesn't sound like someone promoting public health, I don't know what does.

Seriously, though, I hope that woman recovers--and doesn't smoke!

Recycling Bikes In Brett's Memory

Families find all sorts of ways to keep the memory of a loved one alive.

This might be a "first", though:  a recycle-a-cycle program.

Three years ago, a motorcycle accident took Brett Rainey, whom his sister, Lisa Karrer, described as her "best friend".

She lives in Huntington Station, a Long Island town just a morning or afternoon ride from my apartment.  It has its charms, but as in many parts of Long Island, streets marked with hardscrabble lives are woven among the strands of  mansion-lined lanes.  A kilometer or less away from folks who drive their Mercedes' to shops where they buy the latest carbon fiber bikes and lycra kit, one can see children who don't have a bike to ride--or immigrants, mostly young, who could use a bike to get to the lawns they manicure and houses they paint.

Living with such a reality, and with the memory of a brother whose last job--and passion--gave birth to the idea.  "My wife said why don't we get used bikes?  We'll fix them up and donate them to the kids that can't afford them, we'll give them in Brett's name because that's what he would have wanted," she recalled.



The family's project, Brett's Bicycle Recycle, has given away about 100 bicycles, tricycles and skateboards since it started last year.  "Some of these kids have never even rode a bike and they're like 14- to 15-years old and they're in shock,"  Karrer explains.  

"He would have loved seeing this," said his mother, Drena Kanz