Re: Case Hardening the Permanent Spindle #lathe


That's an excellent feature to include where grub screws are utilized. To take it one small step forward, my old ShopSmith uses that design on their spindle, which runs all of the tools for it's multi-function design. They not only include a flat on the spindle, but the put an angle into to, sloping down and away from the end of the spindle.  This makes any forces trying to pull the tool off the spindle have to overcome not only the friction of the grub screw, but also the angle of the flat acting as a wedge against the grub screw.   

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