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Variable Pitch Helix

Question asked by Jtyry Srytry on Apr 29, 2020
Latest reply on Apr 30, 2020 by Jean Giacomoni



I am having trouble recreating this pitch on a feed screw.


It starts with two 6mm pitch revolutions, than goes to 12mm revolutions (3 total). I can get the helix to work  from 6mm to 12mm but from 12mm to 12mm always messes up the rest of it.  



Below is how i am trying to set it up, not sure what I am doing wrong.