Quoted: Ho wdo you route the grooves to be perfectly alligned? Do they have jigs for things like this?
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You can make your own jig or template out of good quality plywood, determine your design, for a desk example a 90 degree 18" radius for the front then 6" or so straight back on top. then about a 90 degree 4" radius and then straight down the back far enough that when rolled up there is enough weight to hold it up.
Clamp it to one side piece and route your groove and then flip it over for the other side piece Looking toward your desk the template is clamped to the inside or left side of the right side of the desktop, and then when done you just slide it over to the other side and clamp it. You would actually do the cutting and clamping before assembly.
It's probably more of a challenge inletting and lining up the hardware that holds the top to the bottom, than doing the roll top.
Let's just put it this way, your going to wow the guys when you show them what you did, just down't let them know how easy it really was...
You can even get fancy with s curves but that gets a little tougher because the groove needs to be able to take the twisting but not be too loose.