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Step 3: Arms - steel part

Picture of Arms - steel part

Making those arms (a pair for the lower arm and a pair for the upper arm) is quite simple although time consuming:

  • draw the shape on the steel bar
  • cut with an angle grinder
  • grind to the final shape (I hold both of them in a bench vise while grinding to have the exact same shape)
  • drill 5mm holes for the articulation
  • sand (2 passes, 2 different grit)
  • polish and buff

I added a picture with tools I used to go from raw steel bar up to the finished arm.