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Binding Mounting

post #1 of 5
Thread Starter 
I see on you tube, an individual demonstrating how to mount bindings using paper templates downloaded from  the internet. He shows how to mark the longitudinal center line of the ski by measuring half the distance of the width of the top sheet of the ski.  Question is, aren't you supposed to measure across the base from edge to edge to get the true center of the ski.  Isnt this what a jig references on for the longitudinal center line. It appears the the top sheet of some skis is not alway centered. Thanks for any thoughts.
post #2 of 5
You're absolutely correct - every mounting jig out there is going off the sides of the base since that's the widest part of the ski.  However, it's very rare to have a top sheet misaligned to those bottom edges.  Even if it was it would only be off by such a tiny amount that there's no way you would ever notice that a binding mount is offset.

There will be those who will claim they can feel a 1mm offset binding mount, but in a blind test I highly doubt they could actually live up to that claim.

BTW - although the method shown for finding the center line when using paper templates is OK, it's actually pretty easy to build a jig that grabs the sides of your skis and helps you mark your center line.  It's just outside the "scope" of this post and I'm afraid the heretics will chase me out of town.  I've been doing my own mounts for years and years - I trust myself to take the time to do it right more than the shop flunky on hourly wage.
post #3 of 5
I think it is naive to assume the topsheet graphics are centered on the edges or centered front to back, and that notion has been confirmed when I see videos or photos of ski construction.  The topsheet graphics are often the last or next to last layer in the lay-up, and are not usually clamped or aligned with any sort of precision in most cases (eyeball alignment is about the extent of it).  I think it's even naive to assume the sidewall milling is going to be uniform side to side or along the full length of each edge -- plenty of my skis have a fairly coarse machining job there.  I have seen examples where all of these factors were off (and it's only a minor cosmetic issue as long as you don't use these features for reference).  For a true reference, I think the metal edges are the way to go.

Here's my approach outlined in detail:  http://www.epicski.com/forum/thread/83637/diy-binding-mount-skier219-method

As you can see, the centerline is established solely by the metal edges.  I would not do it any other way.
post #4 of 5
Thread Starter 

Gentlemen, Thanks for the reply.  Skier219, What a great post on diy mounting!

post #5 of 5
skier219 - first of all the top sheet even if it is off a bit isn't going to be off by more than a millimeter or so.  Even if it is the last component in the layup, the sides are still milled down and the top sheet is still a reasonably accurate guide for most people's needs.  Once again I seriously doubt anyone would notice the difference with a mount based off the top and not the sides unless the ski was grossly mis-manufactured.

Note though that I do use my own jig for marking the center line and it doesn't use the topsheet.  In this regard I reviewed your DIY mounting thread and the method you use to find the center line.  Although it is "sufficient" it also is lacking in absolute accuracy if you take a look at some of the methods used by some of the TGR folks.  There is room for error in your method since the "window" of the side edge you're depending on is fairly short.  My jig utilizes a much longer section of the side of the ski in establishing the center line and is not subject to possible small fluctuations that could occur when using only a short section.  But once again, even though there are issues with any method I'll argue that as long as the mount is straight and reasonably on center you are fine.  In fact, I would go so far as to say that it's actually much more important that the mount is straight than exactly on center.
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