Kinda feels like it. My ribs are bruised. Montucky you crossed the line. MM I am entitled to secrets, you are a fool if you think that we small time builders are the only ones here looking at designs and ideas of others. I won't loose my ideas to some large company to a patent. I don't feel that the...

Thanks chrismp, you explain things better than I. Can I just check whether the width of the laminates top and bottom are the same or similar? The description of your board seems to suggest otherwise. The base will become flat when heated because it was flat when it was cured. The widths are the sam...

This problem has only surfaced when turning to heat for cure.

I appreciate all of your support and feedback. I will keep trying and succeed or will have to quit.

So lets assume there is no lateral shift and that the lower laminate is not affected by a kink over the edge set. Do you know how much epoxy you are losing to the core. Are the core materials top and bottom the same? How much epoxy I am losing to the core? I am not sure what you are asking but I wi...

First of all, do you have a layup with the same fiber orientation on both sides? no, but neither does the core and it is perfect. Do you use a symmetrical layup in terms of fiber weights as well? no, but neither does the core and it is perfect. If both of the upper points are true, I would try to pu...

Richuk wrote:So you have no lateral shift of the core. You have looked at a faulty board in cross-sections?

There is no way it can shift- core is done before it goes in the press for final stage assembly.

Dtrain I would have to say that there advantages to having a base that is concave in the case of corrugation. It is much stiffer for the given thickness, but impossible to grind-unless it is kept at a constant 170* during the grinding process.

I have used two heating processes one hydronic and silicone heating mats, both have been closely monitored for actual temp compared to pid temp. For our purposes the temps are within a few deg. C. Uni-carbon is most likely to expand along its length since the fibers are not common to each other in t...

Richuk, only flat if the heat is applied, if the heat is close to pressing temp. the board is flat as it cools again the base will go right back to concave.
concavity comes thru as convex on top. The entire core is being pulled in at he base.

MM I have had no problems with carbon fiber in my boards, either uni or 2x2 or 4x4, a combo of fg, and cf with multiple layers. Yes metal cat track (steel 1x1 .065 wall). Never any issues at tip and tail upcurves with flatness after completion (of course this is a compound area and would not expect ...

I do apprecate you taking the time. I am frustrated and upset that this whole thing is contunuing to blow up in my face. I have come to the point that I am afraid to put a prepped core in the press and result in a fail. I have spent time trying to determine what is going wrong and what will go wrong...

The molds are hand-made. The problem happens over multiple molds and molds are always checked for flatness. They are as perfectly flat as really can be, less than .001 across the width. There is absolutely no chance that the press table is bending (I designed and build my press and it is industrial ...

rebate is measured and even slightly exaggerated. My question then is if it were a rebate issue; why would the concave go away when the heat is returned to the board? No I do not compress cool, I have tried it anyway with no differential in results. The resin system is designed to be heated and full...

Yes the resin is measured by weight to the milligram. All weight of resin is recorded in mixing cup, hardener amount is figured (prior to mixing anything and totals are recorded on mixing cup so all I have to do is tare the cup and add the hardener. Have you tried forced dis-assembly? I would have o...

Yes I relieve the core. Thanks MM
It is a heat issue with the base material, as I said the concavity goes away when it is reheated.