Below is a picture of something i call a contourmat
I would yield and build it for them , so i could rip an imprint off the bottom of there board
The divinicell is sitting on the rocker bed/flexible sheet/contourmat.
Heres another angle on the single into double in a single, without taking one stroke with a tool, i could put that exact same concave on any board , length, width , outline , or rocker.
I’ve been thinking about this myself lately. I’m toying with one or two methods:
make an imprint of the bottom of the board using some sort of paper mache mix. Of course, use some sort of film (plastic film, packaging tape, etc.) to prevent adhesion of the mat to the board, and then use some sort of paper mache (perhaps as simple as a slurry made of newspaper and water?). Maybe mix in some elmer’s glue in there to make a more durable, permanent mat?
Perhaps take a low-density sheet of EPS and saturate the hell out of it with epoxy, and then vacuum bag that down to the bottom of the board that you are using as the female of the mould. Maybe a vacuum is not needed; perhaps the epoxy/foam will be heavy enough to conform to the contours under its own weight? Again, protect the board with a plastic film or something of the like.
That’s funny, just last week I was going through the whole bert thread and that mat thing has been boggling my mind ever since… My guess was vac bagging to a moldable material as well. But what mould that be… I was considering PU foam but thought nah that’s too messy and it foams much too rapidly to keep controlable.
ended up taking the single to double bottom off my flyer as a mold for my comp-sandos
It’s heavy single it’s like 10+ layers of mat with 30+ sheet of glass but it’s still very flexible since it’s less than 1/4 thick. CMP used dcell and carbon fiber cloth
All I do is attach it to the outside of my bottom skin as I am building my blank from flat sheets capturing a rocker I want via vacuum. In one pull like bert showed use I end up with my rocker, a sandwiched bottom, and a fairly sophisticated bottom contour with no shaping and no foam mess. I guess if I was good I’d try and put on the rails like he did at the same time. If I was using full bands of core or dcell I would but my foam starts off flat.
If you have a rocker table like bert used you can just lay it on the bottom.
You can even build bottom shaping component pieces to place on your rocker table to accomplish the same effect.
CMP has progress to the next level by building his bottom up by drawing out his contours on the bottom and cutting them out from thin dcell/corecell sheets like pieces of a puzzle and then tacking them on the bottom off your flat bottom EPS blank before vacuuming on the bottom skin. Its very ingenius real out of the box stuff. makes sense if your plan on vacuuming a wood skin over the foam.
He’s built complicated bonzer bottoms, 6 channels and other experimental curves even step decks as Dcell deck springers using this method instead of pressing in the bottom shape like Bert showed us.
Bert’s system in that thread is very efficient…
From the full band dcell rails to the decell skins and using contour maps and shims to coax the foam under vacuum. I’m sure they are getting to that stage with the wood rails and skins by pre-fabbing them somehow.
CMP should get mad props for that, that was awesome. Using a contour mat it wouldbe backwards though right? You would have a raised part on the table where you want a concave instead of putting D-cell in the areas where you don’t want a concave?
