Tuesday, May 5, 2015


That's no moon.

It's 0.13mm kerf in 0.23mm thick cardstock with a 40W laser at 32% power at 3500mm/min under 40X magnification.

That's 1/14 of a 6' thruster core done in cardstock. This took around 2 hours to cut and assemble.

Assembly was a double X chromosome canine because the notches were too tight, because I had guessed wrong about the kerf. But now it's measured, so maybe the next 1/14 section will go together faster.


even easier to find than cardboard

easy to waterproof - soaks up epoxy

laser cuts faster, at lower power

practical to transport unassembled parts (I think a 6' thruster's parts would fit within a ream of paper.)

Strong enough? Light enough? Will it surf? Will it really take 30+ hours to assemble?


Lucio PGN said...

Hi Mike,

I saw your blog online, I founded a FabLab here in Shanghai fablabs.io/xinfab and I wanted to try building a SUP for myself and my family use. The heaviest person to paddle it will be me 75kg, what model do you suggest me to build, do you have a link? I visited your gallery of boards but I got confused by the names, I also downloaded the file sup12_v-1.zip maybe that's the right one?



Mike Sheldrake said...

The sup12_v-1.zip file linked from a previous blog post has the only SUP design I've published, and as the post explains, it's experimental. I haven't completed one yet. I'm not sure if that core pattern will be adequate for anyone. And it will be more of a glassing challenge than my other designs. But if it does work out, I think that core should be competitive weight-wise with foam cores.

By the way, what are the specs of the laser at XinFab? I maintain this map of public lasers so people can find a local place to make their own core kits:


I haven't been able to find specs for your laser online.
Bed dimensions? Laser power?

Lucio PGN said...

Our laser is 60w 400x600mm. Our website got updated recently. www.xinfab.com I m not in China now I m in Lagos Portugal wanna found a lab here as well, will try to make the Sup here. Will let you know how it goes. Thanks

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