From the archives: by Eric Dacus

Running away from the weather moving up the Chamonix valley and retreating off the Aiguille d’Index. 

Chamonix-50-110814-2126.jpg

Sometimes exterior forces change your expectations, hopes and plans. 

Pre-work view by Eric Dacus

Pre-work view

Got to see the clouds roll in and obscure the stars before dawn and then have the sun add a little bit of warm light to an otherwise blue cast canyon. 

The second pitch of the Great White Icicle was in better than usual conditions too. 

by Eric Dacus

Everything in life is a challenge. You can accept the challenge to improve. Or you can bask and distract yourself with success. It’s up to you. After all, sport is about personal growth. In the mountains you have the opportunity to challenge yourself beyond any means available in daily life.

No snow? by Eric Dacus

Without any new snow recently in any real amounts or on our way in the forecast, we headed up to just go looking around. 

As close to sunny as we got

Up

Our high point

The good turns of the day

Don’t be fooled by the magic of photography, these were some of the only good turns of the day. 

boulder hoping

Definitely put some “texture” on the bottom of my skis after this outing. Looking forward to more (minus hitting as many rocks…). 

Details matter: stainless steels by Eric Dacus

Stainless steel, specifically 17-4, 304 and 316 are all grades that get used in surgical instruments all the time. But these steels are all fairly similar and when put two flat surfaces of the same material are in close sliding contact or load there isa risk of galling. What’s galling? 

Galling usually refers to the adhesive wear and transfer of material between metallic surfaces in relative converging contact during sheet metal forming and other industrial operations. http://en.wikipedia.org/wiki/Galling

A quick overview of stainless steels:

Image from: http://www.machinist-materials.com/stainless_table.htm and http://www.machinist-materials.com/stainless_table_two.htm

In a sliding-wear situation, a galling failure mode occurs first, followed by dimensional loss due to wear, which is, in turn, usually followed by corrosion. Galling is a severe form of adhesive wear that shows up as torn areas of the metal surface. Galling can be minimized by decreasing contact stresses or by the use of protective surface layers such as lubricants (where acceptable), weld overlays, platings, and nitrided or carburized surface treatments.

http://machinedesign.com/BDE/materials/bdemat6/bdemat6_5.html

Review of Wear and Galling Characteristics of Stainless Steel (.pdf)

Its hard to anticipate all the ways an instrument can fail, and galling is not a fun one to find out after-the-fact. The trade off between wear resistance and corrosion resistance in medical devices is very difficult because the parts will be cleaned and sterilized multiple times a week for the life of the part, so corrosion resistance is not really a negotiable item. Wear resistance then has to be solved by dissimilar materials or coatings. The above .pdf is the most comprehensive resource I’ve found so far. 

Sometimes you just have to start: by Eric Dacus

CAD work, modeling, SLA prototypes can be helpful to getting most of the the way through the development of something, but its been my experience so far that until the metal chips start flying, its not real and you can’t really fully understand how its going to turn out. 

Understanding

Perhaps the hard way is the best way. I wish we had started directly learning about this part much earlier. 

November 6th turns by Eric Dacus

Second day of the year? Not a clear definition of where last season ends and this one begins, but November is definitely not last season. This is also just 14 months of skiing in a row. Today was a fun way to get things kicked off: new bindings, the first tour with my brother and good to get out with Rich & Renee as well. There were plenty of rocks lurking under the snow and it felt like less coverage than what we found in October

Home mounting

Home mounting the bindings

Sunlight

The bootpack

Excited

First turns

At these sizes its hard to tell which shots were from my DSLR and which were with the iPhone