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Z axes mod

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abunai

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Sep 16, 2017
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#1
Has any one done a manual ball screw mod?????
Instead of a motor, I'm thinking of a manual hand crank wheel.
I have a grizzly G8689
 

magicniner

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Oct 21, 2017
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#2
You'll need a "holding torque" so you ideally need a gearbox or gearing of some sort as the weight of even a moderate weight CNC Z axis can spin a ball screw and run right to the bottom when the steppers aren't holding it, counterbalancing at least some of the weight with a gas ram will also help.
I've considered something similar on my lathe cross slide but it already works and with the DRO a few thou backlash isn't really a big issue on a lathe
 

abunai

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Sep 16, 2017
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#3
Thanks
just trying to see what options are out there before getting started.
The LMS gas strut stands a little to tall for my liking.
I was hoping the ball screw might hold.
 

magicniner

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#4
Ball screws are about taking out friction, for manual use you will need to add friction back in, the gas strut will reduce vertical load but you still want some friction for a manual machine, that's your holding force.
 
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