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 Post subject: Bent Mr Chomps interface
PostPosted: Sun May 11, 2014 10:36 pm 
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Location: Kodiak, AK
I was just out on an overnight tour with my wife that involved at least one extended crusty traverse. There was no stomping or extreme moves on my part, just a long upward-angling skin across a re-frozen corn crust early in the morning with repeated side loads on the crampons while wearing an overnight pack and me at 180 pounds (w/o gear). At the top, I took the crampons off and noticed that the aluminum upward bend at the front of the crampon (where it wraps under the touring pin) was noticeably flared out on one side: the side that would take the load on the downhill foot. Has anyone bent a Mr Chomps doing this? I figured this was what they were designed for. I should note that they continued to work fine and I didn't notice a change in function or performance, but I think I should replace them at this point since one of them is pretty deformed.

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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Mon May 12, 2014 3:50 am 
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Pic=1000 words


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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Tue May 13, 2014 1:26 am 
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Like this:

Image

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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Tue May 13, 2014 3:25 am 
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Wow.
I think you would struggle to get that dead straight again.


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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Tue May 13, 2014 5:09 am 
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Location: Surfing or Splitboarding Downunder
philip.ak

Are you using a wide crampon on a narrow board?

Wonder how that would flex that far without hitting the sidewall?

This might be your problem

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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Tue May 13, 2014 8:06 am 
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Location: Kodiak, AK
They are regular Mr Chomps on an Ultracraft, which is a pretty standard 260 waist width. Not sure how this would have manifested itself either. I need to mount them and manipulate them by hand to see where the loads come from.

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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Tue May 13, 2014 10:35 pm 
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Location: Kodiak, AK
I figured it out.

The plastic bar that holds the back of the touring pin had its 3 fixing screws work a quarter turn loose each. I had tightened them before the trip, but they do seem to like to back out on mine. The other binding wasn't tight, but also not as loose as the one that got damaged. The small amount of play let the crampon get twisted laterally relative to the pin, so all the load was on one side of the aluminum. I will need to use some epoxy for plastic on the screws in the future.

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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Wed May 14, 2014 3:50 am 
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Bolts coming loose or falling out are responsible for 90% of split binding failures IMO.


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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Wed May 14, 2014 7:53 am 
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I'd agree with that. I blue Loctite every thread on my bindings and I STILL had a ladder ratchet fall off recently. Sheesh.

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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Wed May 14, 2014 5:19 pm 
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philip.ak

I had the same issue with mine, helicoil and problem solved, used M3 from memory.
I supprised they didn't just fall out as mine did before bending the Al.
I suggest you chamfer the tounge too to stop them catching, have a close look you will see what I mean.

Did the same to my verts as the pucks came out with the screws.

10% more engineering effort and the splitboard industry would be bomb proof! (IMO!)

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http://www.firstlightsnowboards.com.au http://www.splitfest.com.au http://www.splitfests.com http://www.mrbc.com http://www.backcountryglobal.com
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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Wed May 14, 2014 8:34 pm 
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Location: Kodiak, AK
firstlight wrote:
I had the same issue with mine, helicoil and problem solved, used M3 from memory.
I supprised they didn't just fall out as mine did before bending the Al.
I suggest you chamfer the tounge too to stop them catching, have a close look you will see what I mean.
Did the same to my verts as the pucks came out with the screws.

I don't follow any of this. A helicoil in plastic for what are essentially wood screws? Chamfer what exactly? I don't have any verts for reference.

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Jones Solution 163W
Venture Zephyr 164/260
Never Summer SL 163X
Burton Spliff 148
Voile Mojo RX 166
BD, G3, and Gecko skins
Sparks!


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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Wed May 14, 2014 10:41 pm 
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Joined: Fri Feb 22, 2008 6:51 am
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Location: Surfing or Splitboarding Downunder
philip.ak

Drill out the plastic with the require size drill to tap the treads in the plastic for a helicoil
You get them as a kit, drill tap and inserts
I think mine were M3

Image

Then use a countersunk screw with the same tread as the helicoil

Here is the chamfer I put on the tongue
Stops it from catching

Image


Image

The ski screw/ self screwing type in plastic will fail on any application where there is a large force.

This was a pain in the verts as they use the same attachmnet eg screw into plastic.

If you can use a treaded screw in a metal insert it will always last longer than just a self gripping screw in plastic.

:twocents:

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Adam West
Board Designer
FirstLight
+61 (0)413 888 115
http://www.firstlightsnowboards.com.au http://www.splitfest.com.au http://www.splitfests.com http://www.mrbc.com http://www.backcountryglobal.com
Sydney - Nowra - Jindabyne


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 Post subject: Re: Bent Mr Chomps interface
PostPosted: Wed May 14, 2014 11:25 pm 
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Location: Kodiak, AK
Cheers. That makes infinitely more sense now. :thumpsup:

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Venture Zephyr 164/260
Never Summer SL 163X
Burton Spliff 148
Voile Mojo RX 166
BD, G3, and Gecko skins
Sparks!


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