Search found 1276 matches

by chrismp
Thu Sep 12, 2019 12:57 am
Forum: Ski/Snowboard Design and Layup
Topic: Need help with kid snowboard
Replies: 13
Views: 184

Re: Need help with kid snowboard

In snowboards a biax layup usually refers to 0/90° fibers and not +45/-45°. That way you get a board that has some stiffness mainly along its length but is torsonally soft.
by chrismp
Wed Aug 28, 2019 12:12 am
Forum: Equipment and Tools (e.g., ski press, core profiler, etc)
Topic: Could you make a pneumatic bladder from scratch?
Replies: 17
Views: 6434

Re: Could you make a pneumatic bladder from scratch?

I don't recall the exact overlap of the fabric. I think it was About 1" to 1.5". Maybe Montucky remembers what he has sewn for me :) For the resin I used Adiprene LF 950A. I wouldn't recommend using that one though as it is a pain to get bubble free without special equipment and the pot life is way ...
by chrismp
Tue Aug 27, 2019 12:22 pm
Forum: Equipment and Tools (e.g., ski press, core profiler, etc)
Topic: Could you make a pneumatic bladder from scratch?
Replies: 17
Views: 6434

Re: Could you make a pneumatic bladder from scratch?

The overlapping box stitches were done by MontuckMadman for me. I simply coated the whole inside of the fabric tube with flexible polyurethane resin and then clamped the open ends shut with iron bars. I can't remember the exact pressure it started leaking, but I think it held up fine up to my usual ...
by chrismp
Fri Jul 19, 2019 5:21 am
Forum: Journals: Log Your Ski Building Progress
Topic: Here we go- Another ski press build thread
Replies: 17
Views: 9081

Re: Here we go- Another ski press build thread

I had one of those fabric sleeve presses with sleeves made by montucky madman (thank you!). Pressing with the sleeves worked very well, but it was a pain to get the sleeves onto the press. Maybe if you cover the press in some low friction plastic material it would work better.
by chrismp
Wed May 08, 2019 11:58 pm
Forum: Journals: Log Your Ski Building Progress
Topic: WRONG 2017
Replies: 61
Views: 14012

Re: WRONG 2017

If it's lightweight you could also use it right under a plastic topsheet to avoid the texture of the non-woven fiberglass layers to print through.
by chrismp
Wed May 01, 2019 1:58 am
Forum: Ski/Snowboard Design and Layup
Topic: Pre-treating paulownia or balsa core
Replies: 15
Views: 1004

Re: Pre-treating paulownia or balsa core

That might work. I would try to use a resin that has pretty high viscosity, so it doesn't seep into the pores as easily. Probably a good idea to do this right before pressing and start pressing once the resin started to gel and gets tacky. That way the epoxy for the reinforcement layers has a good b...
by chrismp
Sun Apr 14, 2019 11:37 pm
Forum: Ski/Snowboard Design and Layup
Topic: Expert forum: QCM epoxies (Questions answered!)
Replies: 32
Views: 45539

Re: Expert forum: QCM epoxies (Questions answered!)

Afaik cotton chips are usually only used when bonding materials with no reinforcement fibers in between that hold the resin. E.g. they are used for glueing wood that would otherwise soak up the resin and leave a dry bond. I don't think it would add a noticeable advantage in a ski though.
by chrismp
Wed Apr 03, 2019 11:41 pm
Forum: Ski/Snowboard Design and Layup
Topic: NEW SKI MAKER NEEDING BASIC HELP
Replies: 3
Views: 480

Re: NEW SKI MAKER NEEDING BASIC HELP

What epoxies are available, usually depends on where you are located. Try to get some West System 105 with the 209 extra slow hardener.
by chrismp
Mon Apr 01, 2019 1:08 pm
Forum: Test and Trip Reports: How Did They Work?
Topic: Winter Solstice - Orbit 164 - First Board
Replies: 1
Views: 293

Re: Winter Solstice - Orbit 164 - First Board

Awesome! My most recent build is a wide board as well and I love it...it's a 151 park board with 265mm center width (still not nearly as wide as yours).
by chrismp
Thu Mar 28, 2019 5:35 am
Forum: Ski/Snowboard Design and Layup
Topic: Best cut of wood for core wood
Replies: 7
Views: 735

Re: Best cut of wood for core wood

Nice! Always good to see people using local woods to make their cores!
by chrismp
Thu Mar 28, 2019 1:50 am
Forum: Ski/Snowboard Design and Layup
Topic: Best cut of wood for core wood
Replies: 7
Views: 735

Re: Best cut of wood for core wood

This depends on how you plan to make your cores. Your goal is to have the grain running the lenght of the core as straight as possible with the grain being vertical in the ski core. I often buy plain sawn wood that I glue up into a large core block with the grain running horizontally over the width ...
by chrismp
Thu Mar 28, 2019 1:45 am
Forum: Ski/Snowboard Design and Layup
Topic: woodcore thickness
Replies: 5
Views: 809

Re: woodcore thickness

You will probably not find any study that gives a comprehensive overview on this topic as it is way too complex. Stiffness of a ski is affected by many factors (e.g. core thickness, reinforcement layers, length and width, etc.) that all work together as a system. Even for big manufacturers that have...
by chrismp
Wed Mar 27, 2019 5:34 am
Forum: Journals: Log Your Ski Building Progress
Topic: Fugeskis 2019
Replies: 13
Views: 1079

Re: Fugeskis 2019

Lerio wrote:
Tue Mar 26, 2019 12:35 pm
They are molded during layup, screws are "a bit structural" but they don't do much, I sand and etch the stailess steel and it bond insanely well.
What do you use to etch the metal?
by chrismp
Sun Mar 24, 2019 1:22 pm
Forum: Materials and Supplies
Topic: European/ German Source for Vacuum Equipment
Replies: 2
Views: 313

Re: European/ German Source for Vacuum Equipment

www.r-g.de and www.hp-textiles.com are both German shops that have what you need.
by chrismp
Sun Mar 24, 2019 12:48 am
Forum: Ski/Snowboard Design and Layup
Topic: side wall delamination
Replies: 6
Views: 658

Re: side wall delamination

Using a downcut router bit can help with that problem too.