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Messages 1 - 20 of total 24 in this topic << First  |  < Previous  |  Show All  |  Next >  |  Last >>
CalicoJack

climber
CA
Topic Author's Original Post - Nov 7, 2012 - 01:05pm PT

Just when I've been looking for some bigger cams...

http://www.ebay.com/itm/large-cam-/290808353445?pt=LH_DefaultDomain_0&hash=item43b58752a5

...bet your life on it?
this just in

climber
north fork
Nov 7, 2012 - 01:11pm PT
yER gUNNA dIE
Enthusiast

Sport climber
Port Townsend WA
Nov 7, 2012 - 02:37pm PT
I'd stack that
steveA

Trad climber
bedford,massachusetts
Nov 7, 2012 - 02:53pm PT
I was a machinist all my life, and climbed for 45 years.

Try just buying the aluminum for the asking price; never mind the labor.

The physics remains the same, and it may not have the bells and whistles, but I bet the thing works fine.

Wish I had owned that type of thing BITD. but not sure I would of liked lugging that thing up the Steck-Salathe.
MisterE

Social climber
Nov 7, 2012 - 04:26pm PT
Couldn't work any worse than the 6" wedge of 4 X 4 that I cut and slung BITD to protect an Index, WA climb...
Greg Corliss

climber
Bishop
Nov 7, 2012 - 05:11pm PT
The larger the distance between the contact point on the rock and the axle the greater the torque applied to the axle from the cam. Torque = force x distance.The weekness of many large units is when the cams bend over and the unit folds over sideways under load
Jaybro

Social climber
Wolf City, Wyoming
Nov 7, 2012 - 06:13pm PT
Looks like a clean design. I wonder how wide it is across the axle.
CalicoJack

climber
CA
Topic Author's Reply - Nov 7, 2012 - 06:44pm PT
Yeah - I was also wondering, maybe i can fish another pic outta him.
BASE104

Social climber
An Oil Field
Nov 7, 2012 - 06:53pm PT
A buddy of mine was stationed in Korea for a while, and he got a Korean Machinist to copy all sizes of friends.

They sucked, though.

The offwidth masters use super large hand crafted cams.
Captain...or Skully

climber
Nov 7, 2012 - 07:23pm PT
Axle width would definitely be key.
Jaybro

Social climber
Wolf City, Wyoming
Nov 7, 2012 - 07:26pm PT
It's been the downfall of many a home made giant cam. Like the one that came out in the rostrum, rattled down most of the pitch I was following and bonked me in the head!
enjoimx

Trad climber
Yosemite, ca
Nov 7, 2012 - 09:49pm PT
As long as it has the trigonometric spiral lobe characteristic, I'm sure it would work. Not going to be as light as the BD # 3 though!
CalicoJack

climber
CA
Topic Author's Reply - Nov 8, 2012 - 10:02am PT
Pretty narrow as it turns out ( ~3"). An interesting piece though...

Roxy

Trad climber
CA Central Coast
Nov 8, 2012 - 11:32am PT
wow...and I thought homemade 'clif bars' were cool.

hillrat

Trad climber
reno, nv
Nov 15, 2012 - 08:41pm PT
you want more info on it? should be delivered soon :)
Ksolem

Trad climber
Monrovia, California
Nov 15, 2012 - 08:56pm PT
Back in the wild and crazy days I soloed Tobins at Dome Rock once, largely to escape the wrath of an easily enraged woman - but that's another story...

Along the way I plucked this out, looks a bit like the ebay cam.

Has "Gulag" stamped on the stem, and made of poor metal.

Mystery cam...
Mystery cam...
Credit: Ksolem
CalicoJack

climber
CA
Topic Author's Reply - Nov 15, 2012 - 09:06pm PT
Nice! Jumped in on the opening bid, but then forgot to check in on it after picking up some Yates Big Dudes. Would be interesting to hear a field report!
hillrat

Trad climber
reno, nv
Nov 15, 2012 - 09:10pm PT
yeah, i forget to check ebay stuff. usually when it goes cheap too! but now I'm broke... so this will be the last purchase for awhile. now if I could just get out and climb more...
hillrat

Trad climber
reno, nv
Nov 20, 2012 - 09:07am PT
I have this thing in my hot little hands now.
photo not found
Missing photo ID#274704
so i disassembled it to check it out. After graphing out the "ideal" logrithmic 14 degree cam angle spiral, its not even close. It doesnt even fit a 10 degree spiral which would put outrageous force against the rock and probably deform the cams and or axle. Also the springs appear to be no more than bent wire and one cam rides on the threads of the bolt used as an axle.
photo not found
Missing photo ID#274705
So enlighten me... Do i reprofile the cams, fix the springs and axle and then whip on it? Or do i take up tossing and huck it off the movntain like so much other gear thats no longer of use at the top of the cap'n?
Curt

climber
Gold Canyon, AZ
Nov 20, 2012 - 09:17am PT
After graphing out the "ideal" logrithmic 14 degree cam angle spiral, its not even close. It doesnt even fit a 10 degree spiral which would put outrageous force against the rock and probably deform the cams and or axle.

I wouldn't necessarily worry about a 10 degree cam angle. Cams routinely experience much higher forces than that when they are used in flaring placements. In fact, as the angle of the flare approaches the cam angle the range of the unit goes to zero and the forces become theoretically infinite.

Curt
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