Tag: Collimation

Self Made Collimator

by on Juil.01, 2010, under Astronomy

Nothing simpler than making a low cost but efficent collimator:

  • a piece of PVC tube D=32mm
  • Two self made orifice plates
  • A cheap Laser Pointer
  • A Cross hair printed on an elliptic paper
  • and some tools
  • For the PVC tube the household sewer tube can be found in any shop.
    To get the required concentricity, the best is to do both at same time:

  • Two alu plates fixed together and circular cut
  • Bore a 1mm hole in the plates
  • fixation of the plates with a screw in a drill
  • polish the edges to make it fit the tube intenal diameter, circular and concentric
  • For the cross hair I printed it on a paper including the hole in the middle (concentric ellipes and cross).
    Centering the laser pointer in the tube wiorks quite fine with six screws.

    To fit the 32mm exterior PVC tube diameter to the 31,75mm fix it into a drill or lathe and use some abrassive paper to reduce diameter.

    And that’s it.
    Have a look at the beast!
    collimateur laser

    The complete drawing is here Collimator_Drawing

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