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The beating of the ring gear is extremely poor

Update:30 Oct 2017
Summary:

The center of the workpiece bore does not coincide with […]

The center of the workpiece bore does not coincide with the center of rotation of the machine table
  The reason
A   related machine tools, fixtures:
  1) Worktable radial runout large
  2) mandrel wear or radial runout large
  3) the upper and lower thimble is biased or loose
  4) Fixture positioning end face and table rotation center line is not vertical
  5) Workpiece clamping elements, such as gaskets and cap not enough
B   on the workpiece:
  1) The workpiece positioning hole diameter is out of tolerance
  2) with the workpiece is to find outside the installation, the outer diameter of the cylindrical and bore the tolerance
  3) the workpiece clamping rigidity difference in the control of the table set the rotation of the table accuracy and the correct installation of the workpiece
Countermeasure
A   For machine tools and fixtures:
  1) Check and repair the table rotary rails
  2) reasonable use and maintenance of the workpiece mandrel
  3) after the repair column and the accuracy of the top thimble
  4) The fixture locating end and the table rotation center line are not perpendicular
  5) Improve the accuracy of workpiece clamping components, such as gaskets and hats
B   on the workpiece:
  1) control the workpiece positioning hole size accuracy
  2) control the workpiece coaxial and cylindrical bore coaxial error
  3) The clamping force should be applied to the site where the rigidity is sufficient

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