Quote Originally Posted by Clive S View Post
Then what are you going to do with them? You will end up with two rails that will bend when you move them.

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I dont want to use them for constucting a machine, but to check the flatness of a machine, just the way i would do with a straight edge
The use of these rails is to use them as straight edge so that you can chek the flatness of a machine.
My question is if these aluminum tubes are reliable straight edges?