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Helical milling – links

helical milling – introduction

helical milling – helix angles etc.

helical milling – left hand – right hand

gear trains

computing gear ratios – Hobnail

various setups to get shorter leads than usual

helical milling on a horizontal milling machine

helical milling on a vertical milling machine

helical milling by rotary copying

1 comment
  1. John Williams said:
    John Williams's avatar

    hi john
    would you send me a copy of hobnail i’m trying to cut a couple of helical spiral gears on my bridgeport mill, not having a lot of luck with the calculations for gear train i’ve got very close but the gears don’t mesh at 90 degrees.

    john

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