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Straight edge ideas

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Insect

Active Member
Joined
Nov 5, 2019
Messages
26
So I need a straightedge of about 15' long to build some wing spars. I use and trust extrusions like 80-20, Misumi, kinda easy to make a jig for that and they are very straight. At work I have a 1"x2" 25' beam of 80-20 is not stiff enough to define any straightness, on it's own, not at all, so either a truss, or taller beam comes to mind... I'm drawing a blank on how to do this at a reasonable cost, any experiences?

Ultimately when you exceed 10' then gravity tends to take over, you can probably imagine the game. Any device that is truss shaped can be adjusted with a laser, not really rocket science, just fishing for ideas.

I could make a wooden pan and self levelling concrete, but, I'm not really wanting to paralyze the shop tables with 500lb of concrete to do this. I have a large pond, so any floating contraption could also work, then gravity is no longer flexing the beam, what a pain, making wing spars while in a pond, eh not for me.
 
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