Ski Builders Forum

Looking through this, and other sites, a home user can get an idea of standard dimensions of stuff. But it's not laid out nicely anywhere to get a design going before you purchase parts, or while parts are on order.
Perhaps we could do this here?

I'm thinking stuff like:
-the cross-sectional size of normal edges are HxW (1.5mmx1.5mm??)
-Normal UHMWPE sheets are x" thick?
-the standard diameters/lengths/shoulders of binding inserts are?

I'll start with the stuff I DO know:

-Standard pre-preg sheet thickness after cooking/compressing:
300gm = 0.012"
200gm = 0.008"
150gm = 0.006"

This is good for carbon and kevlar, and it's how I figure my laminate thickness (hence stiffnesses).
I would imagine that well made wet layup sheets will be close to this.

good idea.

- edge cross-section (H X W) = 1.2-1.5mm X 1.2-1.5mm
- base thickness = 1.2-1.5mm
- topsheet thickness = 0.6mm
- inserts: height = 5-7mm ; diameter = M5,M6 ; flange = 1/2" diameter

How thick is the damping rubber that is often used.
I've got rolls of .055" (Dina h?).
Probably have to use a few plies for tip spacers, not sure how that will work....

stupid question:

kam S leang wrote:- inserts: height = 5-7mm

if the inserts are only 7mm tall (add 2-3mm for the counterbore?) how do they make it through a 12mm core?

yeah, we have to counterbore the core so that inserts sit flush with core's top surface. i'm trying to find an insert supplier so that we can get some longer inserts (9-11mm in height). all of the inserts that are available to us right now are designed for snowboard cores which are much thinner than ski cores.

also about the rubber damping material. i don't have any on hand to measure and i can't seem to remember the exact thickness but our strips are very thin. they have a similar thickness as those flourescent pink powder cords that some people leave dragging 50ft. behind them on big storm days.

are snowboard binding inserts the same as alpine ski binding inserts?

^ oops, i mean the diameter of the inserts.

pretty much. inserts are rarely used by ski manufacturers especially for alpine skis because of the lack of binding standardization. the companies that do use inserts (K2 and Line) use modified versions of snowboard inserts. K2 uses a smaller diameter (M5) insert, while Line uses the standard M6 diameter insert (i think?) with additional threads located on the outside diameter of their inserts so that they can be drilled into the core.

but you can use any size insert you want. simply find t-nuts of the desired size and put them in your core. you'll have to seal off the ends of the t-nuts though to prevent them from getting ruined by epoxy during layup.

can someone please tell me the average dimensions of sidewall material, if you were going to buy it in bulk?

Contact Jim at crown plastics. It is way cheaper to buy from them and he is your man to give you info on bulk sidewall

I'm trying to get a bunch of materials from Isosport so I don't pay all of that shipping for nothing.