I dont have a good speedy method for chambering, but the best way so far seems to be removing the bulk with multiple plunges of the forstner bit on my little drill press, then following up with the jig saw, and finally, the horse hoof rasp from mattwho.
It's a bit tedious. So I have 5 of the 10 chambers done on this piece, weight has gone from 8.5 to 6 lbs, will update when I finish.
I'm chambering pretty "aggressively", cuz I want to see a 50% drop in weight if I can.
Great work, thanks for showing how you do it in good pictures!
I wonder if it would work to do a 'Honeycomb' approximation for the chambering, by marking hundreds of drill sites and then use the drill press only. No solid ribs, just holes, maybe with varying density or diameter depending on where more strength is needed in the board.
I imagine that would cause very even distribution of hull strength and might be easier overall.
No idea if the holes would have to go through all the way (difficult but not impossible to line up) or if random holes would work, with a few holes communicating between the 2 sides of the slice.
I haven't gotten to that point yet, but that's the plan.
I plan to pack the holes with foam.
I had also considered glassing the holes inside then finishing the outside with varnish, has anyone done this before?
Foam is a good idea, so you do not have to worry about interconnecting the chambers for drainage or add a vent.
Also Cedar can split along the grain pretty easily with an impact in the center of a chamber.
I kept imagining a well placed knee puncturing the hollows on my recent build, and wound up adding a lot of reinforcement which helped push my desired end weight upwards.
Good point, so glass over everything probably best.
My skilsaw doesn't cut deep enough to make it in one pass, so I cut from the top & the bottom to get all the way thru.
That which can be assorted without evidence was read in an illegal magazine.
Send me your dinged, damaged, and yellowed.
Yes there is "air" even with foam, but the expansion and contracting of air is different with foam than with just air - my experience with HWS makes me leery of having so much air without venting. Not so with foam, I have a nine foot EPS longboard without venting, no problems.
I suppose we could discuss the density of the packing foam, but I feel pretty confident venting is not gonna be an issue. There are guys who chamber without venting, but I'm doing some pretty aggressive chambering, so I feel better adding foam.
Like Gene Cooper did on his master craftsman winning board. Sorry I can't access the embed code from my phone https://youtu.be/Y8UbkxMDwNA
Of course dings can be an issue, but I've got a strong wood shell, and with the foam inserts, the board is very strong, IMO. And water damage is always gonna be worse in a hollow board, based on my experience with HWS, where even a pinhole can be catastrophic.
Sejal that's a sincere thought but the real source of those issues is way outside the scope of this thread
blah blah blah
It's a less than precise process, the idea is to shoot for serious weight loss, but don't get too thin cuz there's still a little shaping and cleanup to be done.
A nearby sushi place throws these foam coolers out, thnx sharkcountry for the idea, gluing together with contact cement (water soluble), will glue in place with gorilla glue. Or maybe just stuff 'em in there and call it good.
Weight went from 8.5 lbs to 4.25, before foam inserts.
Personally I'm always ready to learn, although I do not always like being taught. - Winston Churchill
Psychologically, I think this is harder than a fishbone hws. Cuz there you start out with nothing, and each step takes you closer to a real surfboard. Here, you shape a surfboard, then you deconstruct it, and for awhile each step takes you farther away from that complete surfboard you started with.
Eventually of course you reconstruct it, I can hardly wait.
Meanwhile I can lay the sections out, and imagine them forming a real surfboard again.
At this point I'm still playing around with different methods of chambering, that CNC sounds pretty good, haha, but it's all about doing the best I can with what I have.
No Diff on that one.
http://pushheretosavealife.com/ Be safe, have fun. -J
Jrandy - turns out that despite the difference in grain color the weight difference is pretty small, so probably easily addressed, or maybe not worth worrying over after all.
But I haven't yet gotten to chambering the rail sections, those will be a little tricky.
I haven't found a quick way of doing this, so I'm proceeding at a snail's pace, just posting when I take a break from the tedium of hollowing out section by section.
I put the corresponding sections next to each other, and scribed the differences, then sanded down the high spots so they matched. In this way cutting into sections will help keep little asymmetries from creeping in.
I'm gonna lighten this thing as much as I dare, but still thinking I'm gonna end up around 30 lbs. when completed.
Entropy (noun; from the English); (1) a measure of a thermodynamic system's increasing disorder as it approaches equilibrium. (2) thermodynamic happy place. Usage; "Entropy abounds in my workshop".
Smerk, that looks awesome!
Looking through the old classic wood boards and longboards, there is precedent for both the contrasting stringer look, as seen in the first pic, and the more subtle 'just a glue-line' look, as seen on the Duke board.
I think 5 stringers would be a bit much, but I've always liked the 3 stringer look, so I'm thinking maybe a stringer in the middle and at the outside glue line, with just a simple glue line, or maybe a black resin glue line, at the inside joint.
Wow, some hella changes in my life & circumstances gonna disrupt this project.
Working like a mad dog in the evenings to try & get the chambering done at least, while i still have the setup for it.
Used some masonite and finish nailer to stabilize the rail pieces for chambering.
The one piece that's clamped down wants to bend like a big dog. That's the one that fought me on the cutting.
Wow - this thread (like the pieces of this board in my garage) has laid dormant for almost TWO YEARS!!
Took me awhile to even find this old thread.
But now I an finally getting back to this project.