Search found 1427 matches

by chrismp
Sun Feb 25, 2024 3:29 am
Forum: Ski/Snowboard Design and Layup
Topic: snowboard binding template
Replies: 1
Views: 211

Re: snowboard binding template

You mean the hole pattern? If so, it's simple. All holes are 40mm apart on center and for the insert packs with the smaller distance of inserts lengthwise, the distance is cut in half to 20mm on center.

Hope that helps.
by chrismp
Sun Oct 29, 2023 12:20 pm
Forum: Ski/Snowboard Design and Layup
Topic: Carbon ski troubles
Replies: 5
Views: 998

Re: Carbon ski troubles

Do you measure and control the temperature for your top and bottom heat blanket separately?

I also noticed that your layup is slightly asymmetric on the top and bottom of the core, which might also have an impact.
by chrismp
Sun Oct 22, 2023 10:48 pm
Forum: Equipment and Tools (e.g., ski press, core profiler, etc)
Topic: Drum sander
Replies: 4
Views: 1025

Re: Drum sander

Nice one, glad you could work it out! :)
by chrismp
Thu Oct 12, 2023 11:06 pm
Forum: Equipment and Tools (e.g., ski press, core profiler, etc)
Topic: Drum sander
Replies: 4
Views: 1025

Re: Drum sander

It looks like your core is just too stiff for the feed rollers to push it down into the rather tight looking core profile you are trying to achieve (how long is this core and what are the thicknesses you're aiming for?). You can adjust the tension of the feed rollers on this sander - check the manua...
by chrismp
Thu Oct 12, 2023 10:59 pm
Forum: Equipment and Tools (e.g., ski press, core profiler, etc)
Topic: CNC edge bender ?
Replies: 5
Views: 1392

Re: CNC edge bender ?

I always thought that the DI Wire Bender by Pensa Labs might have some potential to be modified into a kinda "cheap" edge bender for ski building.

Check it out here: https://www.pensalabs.com/diwire-pro
by chrismp
Fri Sep 08, 2023 9:09 pm
Forum: Materials and Supplies
Topic: Wide Sheets of Base Material - Canada
Replies: 1
Views: 473

Re: Wide Sheets of Base Material - Canada

www.junksupply.com has wider base material on offer and ships worldwide afaik.

Otherwise I guess it would work to just butt up a couple pieces of base material to get a wider base. A die cut base graphic works the same way. You could do some racing stripe types of patterns for example.
by chrismp
Wed Aug 09, 2023 3:10 am
Forum: Materials and Supplies
Topic: Base material - from standard HWMPE sheet?
Replies: 1
Views: 665

Re: Base material - from standard HWMPE sheet?

Welcome to the forum! Base material is usually not only sanded, but also plasma or corona treated by the manufacturers to get it to bond properly. I'd suggest you try to get some scraps from other Australian builders and run some adhesion tests with your own abraded/flamed material for comparison. Y...
by chrismp
Tue Apr 04, 2023 9:13 pm
Forum: Ski/Snowboard Design and Layup
Topic: Turn second layer og twi-axial fiberglass
Replies: 4
Views: 943

Re: Turn second layer og twi-axial fiberglass

The triaxial glass should ideally be used wirthe the same type of fibers facing the core - either the 45 or the 0 fibers. Which one of them is up to you. Placing the 0 degree fibers facing the core results in a slightly softer board over the length with more torsional stiffness. If placing the 45 de...
by chrismp
Wed Mar 01, 2023 12:31 am
Forum: Ski/Snowboard Design and Layup
Topic: White spots showing through base material.
Replies: 11
Views: 1612

Re: White spots showing through base material.

There are some things you could try (or a combination). Many epoxies are quite brittle, so adding a bit of flexibilizer can help with delaminations. Make sure to test if the flexibilizer works with your epoxy on a sample! And as already suggested adding some sort of filler to hold the epoxy, such as...
by chrismp
Wed Feb 08, 2023 2:01 am
Forum: Ski/Snowboard Design and Layup
Topic: Top sheet replacement
Replies: 6
Views: 1372

Re: Top sheet replacement

I think the hairs are probably remains of a fleece-backed topsheet - however the fleece should have only improved bonding if enough epoxy had been used.
by chrismp
Sat Feb 04, 2023 4:27 am
Forum: Ski/Snowboard Design and Layup
Topic: Top sheet replacement
Replies: 6
Views: 1372

Re: Top sheet replacement

Capita builds snowboards by applying the topsheet after the board is fully pressed and cured...I was wondering if this was one of their boards. Still might be, as they produce OEM boards too.

If this has been built the traditional way, then the culprit is probably that they used too little epoxy.
by chrismp
Thu Feb 02, 2023 1:23 am
Forum: Ski/Snowboard Design and Layup
Topic: Top sheet replacement
Replies: 6
Views: 1372

Re: Top sheet replacement

May I ask what brand and model that board is?

I would suggest doing a thin skim coat of epoxy as a sort of transparent filler and then finishing with some 2k polyurethane.
by chrismp
Mon Jan 23, 2023 2:39 am
Forum: Ski/Snowboard Design and Layup
Topic: Delamination OR something else?
Replies: 14
Views: 2157

Re: Delamination OR something else?

A standout change is the doubling of the tensile strain to failure (and the charpy). I'd expect the laminate properties to be better for the higher cure temperature, especially fatigue properties should be much better because of the higher toughness. Dang, totally overlooked that one! Good thing we...
by chrismp
Fri Jan 20, 2023 2:43 am
Forum: Ski/Snowboard Design and Layup
Topic: Delamination OR something else?
Replies: 14
Views: 2157

Re: Delamination OR something else?

It is not just the Tg that goes up with post cure, other mechanical properties increase as well, especially compression. For the Sicomin resins we use, that is not the case. E.g. with the Sicomin SR 1280/SZ 8525 combo we use, with longer or higher temp post cures pretty much all relevant properties...
by chrismp
Thu Jan 19, 2023 12:20 am
Forum: Journals: Log Your Ski Building Progress
Topic: Jonrezz’s Build Log
Replies: 94
Views: 34399

Re: Jonrezz’s Build Log

Another great pair! We use the same type of mold and when you reach the state where you only need to make a couple of new blocks is only beaten by the first time you don't have to cut any new blocks for a mold haha As for the base warping, this happens due to internal stresses of the base material t...