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Binding DIN range and safety question.

post #1 of 8
Thread Starter 
I had always heard that one should get a binding with a DIN range that puts the DIN you need for yourself near the middle of the range. I want to get some Marker Piston Bindings for a new pair of skis and can get a good deal on the 1300. However, the DIN range on the 1300 is 4 to 13. I intend to ski at 6 or at most 7. I am skiing my Marker motion 1200's at 6 with a DIN of 4 to 12.

What say the more experienced about skiing near one end or the other of a binding's DIN range?
post #2 of 8
alot of great discussion on that topic...I asked something similiar a while ago, and got great answers, the tread evolved further in the second page as to where you should set your dins... see:


[ March 19, 2003, 02:47 PM: Message edited by: LindaA ]
post #3 of 8
Thread Starter 
Thanks Linda,

Lot's of good info and opinion on that thread. My question still stands tho, where within the DIN range of the binding does it function most effectively for safety? The reason I ask is that I am a mechanical engineer, so I am fully aware of the limitations of springs. A single spring for both light and heavy loading is difficult to achieve. So a spring designed for DIN 6 would most likely be one like the Marker so discussed in the other thread. DIN 2.5 to 9.5. 6 is exactly the middle of that binding. Unfortunately the higher line bindings have more elasticity and many times more degrees of freedom for release. I just don't want to wind up with an unreliable setting at 6 on a binding designed with a midpoint at 9.
post #4 of 8
I could be wrong but I would suspect like other things we have talked about, Laywers would have seen to it that there is a great deal of margin on either side of the "din" settings. It's probably ideal to be in the center of the din range but I doubt that you would be at a much higher risk to be near the edges of that range. There are many other things that are much higher risks that I would worry about. If you can get a great deal on a pair of bindings that suit your needs and don't put you in the center of the range, I would not let that stop me.
post #5 of 8
I'm with dchan. If I were at 11 or 12 on a 12 binding I'd go for a 14, just avoiding the extremeties. But I wouldn't look for the middle always. I am at 9 on 12 binding, am aggressive, and only release when I need to. I plan to go to 10 (a bit more aggressivity [img]smile.gif[/img] ).

post #6 of 8
I have always heard, and practiced, trying to stay in the middle third of a binding's range. I have some training as a mechanical engineer (before I bailed out of engineering school and went artsy-fartsy) and I would share the concern about optimal elasticity from a materials perspective when thinking about springs. I certainly agree with dchan about the legal liability issues and the safety margin, but being a perfectionist I try to look at "optimal use" characteristics. BTW, I'm at an 8 on a DIN 3-11 range, and am considering going higher, so I'm already pushing against my own optimal use standard on my current equipment! (and looking to upgrade - but aren't we gear hounds always in that state ?)
post #7 of 8
Long Thong - I don't think designing a spring that covers an adequate range of loadings is at all an issue because;

a) The spring in even the simplest conceivable release mechanisms only need to cover a relatively small range in forces. Look at the DIN chart on Peter Keelty's site. As an example, for a fixed boot size and skier level, going from a 92 lb tiny adult to a 210+ lb "big guy" only changes the twisting release torque from 31 to 67 newton-meters. This is only a factor of two, and is well within the capabilities of simple springs. In other words, this is easy to achieve without the turns of the spring touching each other or the force dropping under the minimum necessary preload value, etc.

b) In addition, in slightly more complicated mechanisms (eg, a roller on a cartiod shaped cam with the rest position being "in the notch" ), the required excursion of the spring can be made even smaller than that needed in a simple design, thereby placing even fewer constraints on the design of the spring.

Personally, how I handle this issue is that as long as my DIN setting is at least one unit to the "inside" of the min and max settings, I will use that binding.

However, to make sure the bindings that I am using on a particular day will release when needed, won't pre-release, haven't been damaged in some other way (ie, fall apart, come off the ski, etc.), just about every day when I first click into my skis, I will immediately force an intentional twist and forward release on each ski. If I can't do this, or if it feels easy/hard/odd in any way, I try it again. If it still doesn't feel good, I then take them off and look things over, or at worst, take them into the shop. Thusfar, the only things that this test has ever detected is some caked snow on my boot and a couple of loose mounting screws over the years. By seeing that this few second test even detects simple problems like these, I am reasonably confident that there are no other problems and that my bindings will likely be working when I need them.

Tom / PM

PS - LongThong - You ought to check in at www.dcski.com for discussions that are local (mid-Atlantic) interest not likely to be covered on Epic. Often you can find out about deals, conditions, etc., especially at WT, Liberty and Roundtop.

[ March 20, 2003, 07:28 AM: Message edited by: PhysicsMan ]
post #8 of 8
Thread Starter 

Thanks for the info and the link.
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