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OmniTurn G3 CNC: Threading Issues

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This page addresses rough threads or cross-threading. This could be due to a spindle encoder problem or a Z axis mechanical issue. For thread-fit issues, see Size-holding Issues.

Here are diagnostics for spindle and mechanical tests for cross-threading:

Belt or Pulley Slippage

If your OmniTurn has belt-driven encoder (GT series:Image of belt-driven encoder on GTBelt-driven encoder on GT pre-2006; Attachments:Image of belt-driven encoder on AttachmentBelt-driven encoder on Attachment pre-2010) the cross-threading may be caused by belt or pulley slippage. Here is a procedure for determining if the bad threads are caused by belt or pully slippage:


Finding the Index position:


Mechanical Test:

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