Yes, you are right we could just subtract concave depth which is not difficult to do. BoardCAD was made by a clever person who used to be on swaylocks, one of the early board design programs. Toddo if someone doesn't have a rocker stick or the computer file numbers then maybe I should not completely dismiss the idea of looking at how your boards sit on the floor if you feel it helps you understand them.Ĭlick to expand. So how do you understand how rocker is distributed and get measurements to compare boards? Again a rocker stick or numbers generated from the board mid point is the conventional (and easy) way of doing it.
It is also useful to understand whether a board is low nose rocker, high tail rocker or vice versa as it gives boards different ride characteristics. I suspect most shapers are looking at numbers a known distance from tail and nose - that's certainly what the computer program spits out. I think most computer shapers use "in a straight line" whereas most hand shapers use "over the curve" because it is easy to lay down a flexible tape measure to get the 1' from nose etc. The only choice is whether to choose "in a straight line" or "over the curve". When using the computer program the rocker numbers are always generated from a tangent from the mid point.
The way I do it is to look at the rocker 1' and 6" etc down from nose and up from tail and compare them with a board of similar length as a reference point - this depends upon the rocker stick being placed in the mid point for consistent comparison. The only thing I really agree with what you said is that understanding how say a nose or tail rocker is distributed is important. If say concave accelerated in the tail region then that increases the rail curve and pushing down on the tail would cause a greater nose rise. Also pushing down the tail and expecting the nose to rise by the same amount would only work if the rocker range that contacts the floor was a perfect segment of a circle. The computer program places the virtual rocker stick on the stringer, so if your board has concave it will be sitting on the rail edges with the stringer elevated. However you will not be able to compare the numbers with those from computer shapers such as Pyzel. You can find Aku Shaper here.īlanks are on the way.should arrive sometime next week.Click to expand.toddo if someone doesn't have a rocker stick or the computer file numbers then maybe I should not completely dismiss the idea of looking at how your boards sit on the floor if you feel it helps you understand them. If not, you'll have to settle for the free software (and find someone with the machine). Also, if you have $65,000 lying around, you can buy the Aku machine and have it cut your CAD board designs for you. I think there's a newer version of the Aku Shaper coming out soon which will feature a 3D viewer. I dunno if I'll make a rocker template, but I did the profile outline just for fun. In any case, here are some screenshots of what I have so far. I think I need to fiddle with the printer margins or something cause I'm getting only 1/4 of the board.
I'm having trouble printing the outline onto paper which I'll then tape together to end up with the final outline. I'll then try to scale it down using Greg Loehr's "1/8" formula to come up with something a bit shorter and thinner. I spent the greater part of last night making a board file by tracing a picture of the Brom fish. The software is not exactly the most intuitive thing to use (even for a computer guy like myself), but the interface is fairly simple and easy to figure out with a little time. I've decided to try my hand at the Aku Shaper software to create an outline/template based off of my Brom fish.