Lathe spindle work stop

This is a lathe spindle work stop used to get repeatable dimensions on parts that are slid into the spindle bore.
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updated October 16, 2023

Description

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This is a lathe spindle work stop used to get repeatable dimensions on longer shafts, etc that are long enough to be slid into the spindle bore in order machine both ends of them.  

Using a socket on an extension, it may be slipped into the bore and tightened where needed. Approximately ½ turn of the forcing screw takes the assembly from slide-able to locked in place. 

Final dimension adjustments are made with the lathe carriage and a dial indicator, etc.

This work stop simply provides a repeatable reference inside the bore. 

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Model origin

The author remixed this model.

Differences of the remix compared to the original

I reworked the design as follows

  • Changed the model to fit my spindle bore of 55mm (~2.164 inches) and made bore easier to change for others.  More could still be done by others to auto select a thread diameter based on body diameter.
  • labeling the timeline to make it easier to navigate and dissect
  • modified all the sketches to draw mostly from user parameters
  • fully constrained all the sketches
  •  cleaned up some weirdness in the dimensions(rounding, etc)
  • broke the individual parts into their own components instead of just being bodies.
  • reworked how the slots were cut and the wedge bodies are extruded to make it possible to dimension them separately for clearance
  •  added more clearance for the wedges to slide
  • changed design to 6 wedges due to my larger diameter( pretty easily changeable in pattern on timeline now)
  • Changed fillets to chamfers to help with printability
  • Changed the thread to suit my needs. The thread still needs to be changed in the timeline since it is not driven off a dimension but rather a drop down menu.  
    There are user parameters for the thread ID and OD which in turn update the bore of the body and the shaft diameter of the forcing screw.
  •  

It is still far from perfect, but hopefully you can continue to build off these improvements.

The end result for me was a functional part with minimal post processing.  I did run a tap thru the body to clean out the female threads and cleaned up the forcing screw taper with a file to remove burrs from seams.

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