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April, 2022

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Idea for CAST systems

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-eREKTion-
Posts: 1369 - Karma: 8,073
Hear me out, what if CAST made plates for heel pieces too? Get CAST plates for all your skis and swap out your pivots and add pin toes when needed. Sounds pretty sick, admittedly, all my skis are in the same break size range but I think it could be a good way to lower the price barrier in ski equipment. Also, I feel like ski/binding manufacturers could have solved this problem years ago if they weren’t money grabbing bitches.


someone tell me I’m stupid and wrong.
May 12 2021 2:38AM 12 0
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tmwtrmash
Posts: 125 - Karma: 881
Idk if u have heard of quiver killers but they claim to let you swap one set of bindings between skis w machine screw inserts. I dont know the reliability of them but people do use them so...
May 12 2021 3:04AM 9 0
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anders_a
Posts: 1638 - Karma: 5,375
I have CAST on all my pivot skis, as I mount all my pivot skis with Binding Freedom inserts

If you use a jig, its 100% perfect every time, never had an alignment issue
May 12 2021 5:20AM 4 0
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anders_a
Posts: 1638 - Karma: 5,375
Should add I was suuuuuuper sceptical to inserts like quiver killer or binding freedom before, but damn, they are just solid! way more than a traditional screw mount, especially lighter skis with lighter cores the difference is huge.
May 12 2021 5:21AM 4 0
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Thegenericskier
Posts: 1244 - Karma: 11,061
just gave my final marketing presentation on a product like this. might be trying to make something work this summer with 3d printing
May 12 2021 12:31PM 3 0
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LINEenginerd
Posts: 159 - Karma: 451
One of my coworkers and I have been brainstorming and working on some solutions for this exact problem. The main concern we have with with using binding freedom inserts in the heel is that they introduce a large stress concentrations when the ski flexes so skis often break there. We have toyed around with making custom pivot heel plates but haven't gotten very far yet. If we end up figuring out anything clever, I will post back with some photos
May 12 2021 2:15PM 3 0
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CatdickBojangles
Posts: 5688 - Karma: 54,751
Pivot toes + tech heel on the way down
May 12 2021 8:51PM 9 0
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TRVP_ANGEL
Posts: 11601 - Karma: 98,788
CatdickBojanglesPivot toes + tech heel on the way down


tech heel toe + tech heel . Could revolutionize the game ngl
May 13 2021 10:11AM 1 0
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anders_a
Posts: 1638 - Karma: 5,375
lol I might try that just for kicks, even delta will probably be nice! say kingpin 13 heel
May 13 2021 2:00PM 0 0
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No.Quarter
Posts: 5218 - Karma: 16,427
LINE_EnginerdOne of my coworkers and I have been brainstorming and working on some solutions for this exact problem. The main concern we have with with using binding freedom inserts in the heel is that they introduce a large stress concentrations when the ski flexes so skis often break there. We have toyed around with making custom pivot heel plates but haven't gotten very far yet. If we end up figuring out anything clever, I will post back with some photos


Thread size and stress concentration should be inverse relationships right? So an insert would result in a lower stress concentration than a normal screw.
May 13 2021 3:40PM 0 0
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LINEenginerd
Posts: 159 - Karma: 451
No.QuarterThread size and stress concentration should be inverse relationships right? So an insert would result in a lower stress concentration than a normal screw.


Ya, you are totally right but in my experience that is not what happens in skis.

We have seen many broken skis at the location of the inserts. This even happens on skis that don't break otherwise. My belief is that it has more to do with removing a large amount of the composites on the top of the beam which are handling large compressive loads in bending. The neutral axis in skis is relatively low because the steel is soo stiff. a Low neutral axis means the top composite layers have to carry a lot of compressive stress. The different in stiffness between the insert, fiberglass layers and core induce additional stresses in that location where the amount of reinforcement is lower. Ultimately the failure we see it the top layers buckling away from the core at the location of the inserts.

That make sense?
May 13 2021 3:55PM 0 0
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No.Quarter
Posts: 5218 - Karma: 16,427
LINE_EnginerdYa, you are totally right but in my experience that is not what happens in skis.

We have seen many broken skis at the location of the inserts. This even happens on skis that don't break otherwise. My belief is that it has more to do with removing a large amount of the composites on the top of the beam which are handling large compressive loads in bending. The neutral axis in skis is relatively low because the steel is soo stiff. a Low neutral axis means the top composite layers have to carry a lot of compressive stress. The different in stiffness between the insert, fiberglass layers and core induce additional stresses in that location where the amount of reinforcement is lower. Ultimately the failure we see it the top layers buckling away from the core at the location of the inserts.

That make sense?


Yeah I think so, you're saying that the top layers of composite aren't as effective in their ability to retain their strength with threaded features? Similar to how it is difficult to make threads in a carbon fiber part so the solution is more often to install an aluminum insert that is reliant on the geometry and surface interfaces bonding well rather than cutting threads into the composite.
May 13 2021 4:02PM 0 0
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No.Quarter
Posts: 5218 - Karma: 16,427
actually that was a bad analogy but my point is that the issue lies in the ability of composites to retain strength in threaded features.
May 13 2021 4:04PM 0 0
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LINEenginerd
Posts: 159 - Karma: 451
No.Quarteractually that was a bad analogy but my point is that the issue lies in the ability of composites to retain strength in threaded features.


Chopped strand composites can do a good job retaining screws.
May 13 2021 4:42PM 0 0
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dolanslebensraum
Posts: 5959 - Karma: -13,063
-eREKTion-Hear me out, what if CAST made plates for heel pieces too? Get CAST plates for all your skis and swap out your pivots and add pin toes when needed. Sounds pretty sick, admittedly, all my skis are in the same break size range but I think it could be a good way to lower the price barrier in ski equipment. Also, I feel like ski/binding manufacturers could have solved this problem years ago if they weren’t money grabbing bitches.


someone tell me I’m stupid and wrong.

Since when does your idea give birth to smarter indian babies
May 15 2021 10:35PM 0 1
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