- #1
wmingin
- 33
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How can I find level within .0005 over 72"
Hello All!
I need to set 2 parallel rails that are 72" long with .0005" accuracy.
I have an electronic sensor that will detect a .0001 change in the position of a 4mm red laser spot. (Maximum laser spot size 8mm). If I can get the laser perfectly level, I can
sweep the laser to any heading I want, and using the sensor get the rails to within .0001" of the center of the beam.
My problem is: how do I get the laser perfectly level to begin the process?
I'm thinking, hang a weighted silver mylar strip from a tripod at say 100 ft from the laser on a calm night, attach the laser on the top of a pendulum bar, and bounce the beam off the mylar, adjusting the laser tilt relative to the pendulum bar until the return beam hits the exit lens of the laser.
Would this work? Would it be repeatable? Better Solutions?
Does a pendulum always hang perfectly plumb?
Thanks For Reading...
Cheers!
Bill
Hello All!
I need to set 2 parallel rails that are 72" long with .0005" accuracy.
I have an electronic sensor that will detect a .0001 change in the position of a 4mm red laser spot. (Maximum laser spot size 8mm). If I can get the laser perfectly level, I can
sweep the laser to any heading I want, and using the sensor get the rails to within .0001" of the center of the beam.
My problem is: how do I get the laser perfectly level to begin the process?
I'm thinking, hang a weighted silver mylar strip from a tripod at say 100 ft from the laser on a calm night, attach the laser on the top of a pendulum bar, and bounce the beam off the mylar, adjusting the laser tilt relative to the pendulum bar until the return beam hits the exit lens of the laser.
Would this work? Would it be repeatable? Better Solutions?
Does a pendulum always hang perfectly plumb?
Thanks For Reading...
Cheers!
Bill