96-8100
1-15-96
HAAS
AUTOMATION, INC.
TROUBLESHOOTING
S E R V I C E M A N U A L
VF-S
ERIES
4
1.3 ACCURACY
Before you complain of an accuracy problem, please make sure you follow these simple dos and donts.
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Dont ever use a wiggler test indicator for linear dimensions. They measure in an arc and have sine/cosine errors over
larger distances.
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Dont use magnetic bases as accurate test stops. The high accel/decel of the axis can cause them to move.
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Dont attach test points to the sheet metal of the spindle head or table.
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Dont check for thermal growth with an indicator on a long extension magnetic base.
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Do insure that test indicators and stops are absolutely rigid and mounted to machined casting surfaces.
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Do check a suspected error with another indicator or method for verification.
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Do ensure that the indicator is parallel to the axis being checked to avoid tangential reading errors.
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Do center drill holes before using jobber length drills if accuracy is questioned.
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Once machining practices have been eliminated as the source of the problem, determine specifically what the machine
is doing wrong.
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Machine will not interpolate a round hole.
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Check the levelness of the machine (See the Installation Manual).
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Check for backlash ("Servo Motors/Leadscrews" section).
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Bored holes do not go straight through the workpiece.
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Check the levelness of the machine (See the Installation Manual).
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Check for squareness in the Z axis.
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Machine bores holes out-of-round.
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Check the levelness of the machine (See the Installation Manual).
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Check the sweep of the machine ("Spindle Sweep Adjustment").
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Bored holes are out of round or out of postion.
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The spindle is not parallel to the Z axis. Check the spindle sweep to the table and the squareness of the Z axis with a
cylinder square. If available use a spindle master bar and indicate the spindle to the Z axis.
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Machine mis-positions holes.
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Check the levelness of the machine (See the Installation Manual).
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Check for backlash ("Servo Motors/Leadscrews").
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Check the squareness of the X axis to the Y axis.
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Machine leaves large steps when using a shell mill.
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Check the levelness of the machine (See the Installation Manual).
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Check the sweep of the machine ("Spindle Sweep Adjustment").
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Cutter diameter too large for depth of cut.
Summary of Contents for VF-SERIES
Page 180: ...1 15 96 96 8100 177 TABLEOFCONTENTS TECHNICAL REFERENCE SERVICE M A N U A L VF SERIES ...
Page 235: ...96 8100 1 15 96 232 VF SERIES S E R V I C E M A N U A L ASSEMBLY DRAWINGS VF 1 COLUMN ...
Page 237: ...96 8100 1 15 96 234 VF SERIES S E R V I C E M A N U A L ASSEMBLY DRAWINGS VF 1 LEADSCREW ...
Page 239: ...96 8100 1 15 96 236 VF SERIES S E R V I C E M A N U A L ASSEMBLY DRAWINGS VF 3 COLUMN ...
Page 241: ...96 8100 1 15 96 238 VF SERIES S E R V I C E M A N U A L ASSEMBLY DRAWINGS VF 3 LEADSCREW ...
Page 245: ...96 8100 1 15 96 242 VF SERIES S E R V I C E M A N U A L ASSEMBLY DRAWINGS 3 4 2 1 ...