Haas Technical Documentation
Mill - Quadrant Mark Correction
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Introduction
Quadrant marks are finish errors that occur where the axis reverses direction. This document tells you how to know if the
quadrant marks are from machine error or from program error. It provides information for:
Programming errors
Mechanical failure of a machine
Backlash
Ballbar test
Friction Compensation
Copyright 2017 by Haas Automation, Inc. No unauthorized reproduction | Last Published On June 27, 2017
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Program Errors
Copyright 2017 by Haas Automation, Inc. No unauthorized reproduction | Last Published On June 27, 2017
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1. The part as programmed
2. The correct tool path based on the center of the original tool path geometry
3. The tool path geometry as programmed.
Make sure the G-code from the CAD/CAM system is correct.
Simulate the cut on third-party software.
Make sure the customer's toolpath geometry is correct.
Make sure the customer's toolpath has no math errors.
Make sure that the intersection points in G02 and G03 have an accuracy of 0.001" (.03 mm).
Mechanical Errors
Ballscrews: Make sure the ballscrew is correctly aligned, and there is no binding or play in the movement.
Coupler: A bad surface finish, chatter issues, and poor accuracy may indicate a sprung coupler.
Backlash: Witness marks on the quadrant lines of a circle indicate axial backlash.
Copyright 2017 by Haas Automation, Inc. No unauthorized reproduction | Last Published On June 27, 2017
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Run a ballbar test to measure the machine for backlash, level, squareness, servo mismatching, reversal spikes, vibration,
and other errors.
Unsatisfactory servo response time or too much axis friction causes axis-reversal spikes.
Axis reversal spikes occur when the axis motor reverses direction. Reversal spikes usually show as quadrant marks on the
workpiece.
Copyright 2017 by Haas Automation, Inc. No unauthorized reproduction | Last Published On June 27, 2017
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Do another ballbar test to make sure there are no errors from backlash, poor leveling, incorrect machine squaring, servo
mismatch, or vibration.
Friction Compensation
Three parameters correct for machine friction. These parameters are:
Parameter 138 : X FRICTION COMPENSAT
Copyright 2017 by Haas Automation, Inc. No unauthorized reproduction | Last Published On June 27, 2017
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Parameter 139 : Y FRICTION COMPENSAT
Parameter 140 : Z FRICTION COMPENSAT
Before you adjust these parameters, make sure:
the program is correct.
a technician examines the machine for wear and failure.
a technician examines the machine for axial ballscrew backlash.
a technician does a ballbar test on the machine.
To use the friction compensation parameters:
1. Write a program to cut a circular boss.
2. Make sure the cutter compensation is turned on.
3. Record the current values in Parameter 138 : X FRICTION COMPENSAT and Parameter 139 : Y FRICTION
COMPENSAT.
4. Divide the current values by 2 if the parameters have positive values. Multiply the values times 2 if the parameter have
negative values.
5. Adjust the cutter compensation value to cut the circular boss again.
6. Cut the boss again and check the quadrant marks.
7. If the quadrant marks are smaller, decrease the values in the parameters. Do this until the marks do not appear.
8. If the quadrant marks appear in only one axis, change the value in the parameter for that axis.
9. If the quadrant marks get worse, restore the parameters to their original values.
1. Add 50 to the value in each director for each parameter.
2. Make sure you do not exceed the maximum value allowed per the Parameter Checker.
3. If the original is +/- 20, invert the value's sign and add 50.
4. Cut the boss again.
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Copyright 2017 by Haas Automation, Inc. No unauthorized reproduction | Last Published On June 27, 2017
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