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C4 4 Lobe Wiggle

Original Post
jstern77 · · Unknown Hometown · Joined Jun 2015 · Points: 15

I have an older generation C4 #4 which has a significant lobe wiggle and play. I have never fallen on it, but have hung it countless times. I have replaced the trigger wires last fall and the other day was out climbing and while leap frogging my gear, I noticed that I couldn't move my cam and that the trigger wires were broken again. I was finally able to clean the cam without trigger wires and noticed that the lobes have a lot of play in the axles. I am attaching a few pictures to demonstrate. I am wondering if this kind of movement is normal or if the cam should be retired. All of my cams have a slight movement, but none move this much.
Thank you,
-Joshua



gavinsmith · · Toronto, Ontario · Joined Feb 2014 · Points: 86

Started this thread last September: mountainproject.com/v/whats…

tl;dr it's normal. Thought it was strange too.

Shelton Hatfield · · Unknown Hometown · Joined Apr 2011 · Points: 650

The only thing that seems weird about this to me is that you managed to break new trigger wires in less than a year.

matt c. · · Unknown Hometown · Joined Nov 2009 · Points: 155

The wiggle is normal and specifically designed this way. I think in the larger cams have have more wiggle so it is more noticeable.

jstern77 · · Unknown Hometown · Joined Jun 2015 · Points: 15

Thank you for getting back to me so quickly. I think I understand what everyone is getting out, but the problem I am having is not that the four lobes are centered properly. That isn't really the 'floating' I am talking about. The two middle lobes seem to be centered properly, but the outside two lobes don't stay parallel compared to the inner two lobes. I have a new C4 and those lobes stay parallel. It seems to me that since the outer two lobes are 'wonky' and move back and forth that the cam isn't as stable as it should be. I am attaching a link of a video clip I shot that I placed on my dropbox.
dropbox.com/s/iux9962tqop8e…

gavinsmith wrote:Started this thread last September: mountainproject.com/v/whats… tl;dr it's normal. Thought it was strange too.
patto · · Unknown Hometown · Joined Jul 2012 · Points: 25

Its fine. Nothing is wrong with it. Those Camalot

(They are last generation Camalots. C4s are only the recent ones)

J-Wright · · Salt Lake City, UT · Joined Mar 2010 · Points: 0

Looks borked. I'll take it to make sure you stay safe.

Shelton Hatfield · · Unknown Hometown · Joined Apr 2011 · Points: 650

There is definitely more play in your older cam, but to echo others on here it's nothing to worry about. At worst you could have a bent lobe or axel, but honestly neither is going to kill you.

dave custer · · Unknown Hometown · Joined Nov 2010 · Points: 2,411

One of the failure modes that occurs in cams is due to repeated loading. The steel axle wiggles and deforms the aluminum cam lobe. The more they wiggle, the more torque will be exerted the next time, and the more the aluminum is deformed. (You can demonstrate proof of concept with a pencil in putty.) A little wiggle is good because it allows the cams to seat on the rock if the crack is not parallel. Too much wiggle will permit enough torque on the cam lobe to bend it when the force is not applied along the cam shaft; when the cam lobe crumples, the cam is unlikely to remain in the rock. Narrow, large radius cams (like the old #4 camalot) are particularly susceptable.

GabeO · · Boston, MA · Joined May 2006 · Points: 302

After seeing the video, honestly, I would retire that cam. It seems borderline, but I'd rather retire it before it goes over the line.

Sort of the equivalent of a rope where you can just barely see a little of the core if you push the sheath strands apart where it's worn.

GO

Guideline #1: Don't be a jerk.

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