Emco 50 Ball Screw Repair

The Z-axis ball screw on my Emco 50 CNC mini lathe was running with quite a bit of resistance. Sometimes I could still hear te stepper motors trying to get the Z-axis into position after a move should have been completed. In the video below I have documented the disassembly and repair process for the ball screw, including replacement of the bearing balls, Grease Nipple and floating bearing.

As mentioned in the video I reused the existing ball screw and ball nut. The ball screw is no longer sold new as far as I could find, but you can still get a new ball nut. It is model number R153223002 and is sold by Bosch Rexroth, see link below. It also includes information, specs and a drawing of the bearing:

https://store.boschrexroth.com/Linear-Motion-Technology/Screw-drives/Ball-screw-assemblies/Ball-screw-nuts/BALL-NUT_R153223002?cclcl=en_HR#&cartId=ba21b2e4-6c86-4339-bc26-3287e1885d3c&reloaded=true

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