Four piece edge

Cornice · Post by **Cornice** » Tue Oct 09, 2012 11:25 pm

Looking at a set of skis my buddy just got. Atomic Automatics. They used a single piece around the tip, second piece around the tail and the two side pieces. The edges come together in the usual spot if you were doing partial edges.
Is this new?

Oh and what the heck i cant even go look at a pair of skis anymore...
This ski build project has rewired me. All i do is look at edge gaps, top sheet imperfections and sidewall overlaps when i look at new skis.

falls · Post by **falls** » Wed Oct 10, 2012 2:00 am

armada has been doing a 4 piece for a while
salomon do a 4 piece on their rocker's with a gap of no edges in the sides of the tip and tail

twizzstyle · Post by **twizzstyle** » Wed Oct 10, 2012 6:18 am

Cornice wrote: Oh and what the heck i cant even go look at a pair of skis anymore...
This ski build project has rewired me. All i do is look at edge gaps, top sheet imperfections and sidewall overlaps when i look at new skis.

HAHAHAHA

I can relate to this so much! Instead of shopping for skis - I look at them to critique them, compare them to my own, and reverse engineer them

sammer · Post by **sammer** » Wed Oct 10, 2012 7:14 am

twizzstyle wrote:
Cornice wrote: Oh and what the heck i cant even go look at a pair of skis anymore...
This ski build project has rewired me. All i do is look at edge gaps, top sheet imperfections and sidewall overlaps when i look at new skis.
HAHAHAHA I can relate to this so much! Instead of shopping for skis - I look at them to critique them, compare them to my own, and reverse engineer them

Yup... was at the ski stores yesterday checking out this years designs.
One pair had finger joints every 2-3 inches (can't remember what they were)

Oh and I did a 4 piece edge last year a little trickier to bend but not bad.
Would have turned out pretty good with a little more pressure.
http://i304.photobucket.com/albums/nn19 ... m/edge.jpg
http://i304.photobucket.com/albums/nn19 ... C01100.jpg

sam

SHIF · Post by **SHIF** » Wed Oct 10, 2012 9:22 am

I used to make three-piece full edge wraps with a butt joint in the tip and a piece across the tail with a butt joint on each side. I thought it would make a stronger edge bond for banging the skis about while standing them up against the wall, etc. Plus it's easier to get a perfect fitting edge if your ski design has tight bends at the ends.

My ski shapes have a short flat across the tail end with tight radius bends at the corners, it's difficult to achieve great results using two-piece edge wraps, but I do two-pieces now just to save time. I don't worry about getting the edges perfectly matched to the bases at the ski ends, tiny gaps get filled with epoxy and wax anyway. I concentrate on getting a great edge fit along the sides of the ski where it's more important.

Also, I was checking out ALL the new models at Christy Sports at Snowbird last weekend (Oktoberfest). I noticed that many of the big fat skis have been stiffened up significantly compared to previous years, especially in the middle of the ski. I like this trend.

-S

Cornice · Post by **Cornice** » Wed Oct 10, 2012 10:01 am

SHIF those are some tight fitting edges!

It would be kinda cool to weld the edge together. I have a TIG welder maybe i could make a truly one piece edge with no gaps.

amidnightproject · Post by **amidnightproject** » Wed Oct 10, 2012 10:40 am

Cornice wrote:SHIF those are some tight fitting edges!

It would be kinda cool to weld the edge together. I have a TIG welder maybe i could make a truly one piece edge with to gaps.

SHIF · Post by **SHIF** » Wed Oct 10, 2012 2:31 pm

Here is my secret weapon for getting good edge joints, and other fine detail work on cores, templates, etc:

Porter Cable 371 Compact Belt Sander

Uses little 2.5" x 14" belts

I also have a PC 4" x 24" belt sander for heavy work.

-S

gozaimaas · Post by **gozaimaas** » Wed Oct 10, 2012 8:39 pm

Cornice wrote:SHIF those are some tight fitting edges!

It would be kinda cool to weld the edge together. I have a TIG welder maybe i could make a truly one piece edge with no gaps.

Thats what I plan on doing, just a quick hit at about 50 amps should do the trick

knightsofnii · Post by **knightsofnii** » Thu Oct 11, 2012 5:13 am

every time i get my edging process down to about half hour(after pre bend), i then discover a new trick or two, that makes them fit even better, but usually makes me more OCD on my edgework and slows me down more.

When done tinkering with my edges, they fit my shape with two clamps; however, i still end up with small gaps, most of which disappear after pressing and grinding.

Yea i was just at dicks sporting goods, looking at burtons that were "hand made in china", edge gaps, wierd blems that only a board fabricator can notice

.

Cadman · Post by **Cadman** » Mon Oct 15, 2012 4:46 pm

Elan has been doing 4 piece edges for quite some time. It helps with storage too since you don't have this unruley edge piece to deal with.

Richuk · Post by **Richuk** » Tue Oct 16, 2012 3:42 am

At some point my local shop will ban me from pointing out all the crappy production errors (not really). Although the number of sidewall gouges you see is surprising.

Four piece - my money would be on cost, issues with tip compliance and falling production values. With a four piece, presses like ours with a static bottom mold still create a bridge between the very end of the tip and the start of the butt joint (there or there about's). The lack of a joint minimises the potential for a bridge and allows for better compliance. Plausible?

IMHO a single piece is better and compliance is a matter of using cams, toggle clamps or actuators.

vinman · Post by **vinman** » Tue Oct 16, 2012 7:15 am

I have 0 compliance issues with a one piece edge wrap. It is PITA to bend but as long on you are getting good mold compliance and enough pressure in the tip it should not be an issue.

I think a 4 piece edge has more chance to fail in some way especially if those joints are near the apex of the tip bend.

carnold · Post by **carnold** » Tue Oct 16, 2012 10:57 pm

Here's the edge welder.....
http://www.machines4u.com.au/view/adver ... S-040/722/

I've used with band saws and so long as the edge is relatively straight I can't see why it wouldn't work.

amidnightproject · Post by **amidnightproject** » Wed Oct 17, 2012 4:55 am

http://www.homedepot.com/buy/lincoln-el ... H6qo2k5znI

That's all you need.

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Four piece edge

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