I have started thinking about precision tools that I will need for the build. I have a post already on the forum where JAZZ explained the tolerances very well: http://www.mycncuk.com/threads/13435...hinists-square

I already own a good dial indicator so now I need a set of straight edge and/or machinists square.

  1. Do I need both a straight edge and a machinists square, or would just a machinists square be sufficient?
  2. What straight edge length is required? Linear rails are 1500mm (Y, base frame), 1200mm (X, gantry) and 500mm (Z).
  3. What machinists square dimension (height x width) is required? Linear rails are 1500mm (Y, base frame), 1200mm (X, gantry) and 500mm (Z).


Helios Preisser straight edges:
  1. Steel square straight edge, cross section 40x8mm, length 1000mm, DIN874/2, @44,40€ https://online.helios-preisser.com/p...1050432013%5D)
  2. Stainless steel square straight edge,cross section 40x8, 1000mm, DIN874/2, @98,00€ https://online.helios-preisser.com/p...4973167720%5D)


Helios Preisser machinist squares:
  1. Steel square with base, cross section 30x5mm, length of beams 1000x500mm, DIN unknown?, @57,00€ https://online.helios-preisser.com/p...1027812493%5D)
  2. Steel square with base, cross section 50x10mm, length of beams 1000x500mm, DIN 875/2, @165,00€ https://online.helios-preisser.com/p...4525824975%5D)
  3. Steel square without base, cross section 30x5mm, length of beams 1000x500mm, DIN unknown?, @24,50€ https://online.helios-preisser.com/p...0938670859%5D)
  4. Steel square without base, cross section 50x10mm, length of beams 1000x500mm, DIN 875/2, @135,00€ https://online.helios-preisser.com/p...0456342882%5D)


So many options, but I think that the DIN874/2 and DIN875/2 would be sufficient. Then it is only about with or without base and the length?