Domino use on warped boards

[jfr]

All of the stock i use for projects comes from rough lumber that I joint and plane. Many times in the past when making panels I have been sucessful in using cauls to hold warped boards flat until the glue dries. I thought I could use my domno to regester boards and eliminate the cauls at glue up. It don't seem to work out. If you regester the domino off the top serface of a board that is not held dead flat then it seems that the hole that the domino mills will not be perpindicular to the surface you registered off from. The results are a very poor allignment of the two mating boards. What techniques are you using to secure your board in  preperation for cutting the domino.

 

[JP]

A couple of things.

I am not really sure why you want to edge join boards that are still warped/twisted etc.  If the board is not laying flat, then perhaps you haven't sufficiently removed enough material on the jointer.  I would think you would want to eliminate the residual stress associated with holding warped material flat during glue up.  Alternatively, you may be experiencing a problem with the edge clamps. They may not be exerting pressure in the correct plane causing a "moment" in the panel which in turn causes it to bow in the middle.  In this case, you may need to 1) purchase new parallel clamps or 2) continue using the cauls.

As far as clamping prior to using the domino, I simply use some festool clamps with a scrap of wood for protection (No MFT yet) on my bench, then make the plunge.  The mortise placement will only be as good as the surface you are registering off of, so if the stock is not "four-square" you may continue to experience problems.

Just my two cents from a novice woodworker.

Jason