RM> is there an economical way of buying or

 RM> making a 2 or 3 metre long straightedge?



 RS> I think the best way to get that is just some heavy gauge aluminium

 RS> channel, say 75x25mm. U shaped but with the 75mm the bottom of the U.



Sounds like a good start, although I'm after something that's

accurate to within 1 mm over 3 metres, that I can use to make flat

this sleeper benchtop I wanna build once the wood's dry. Perhaps if

I build an aluminium truss over the top of the channel, with screw

adjustments at each attachment point. Making slop-free joints could

be fun, though.



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