Haas VF Series Service Manual

96-8100 1-15-96
HAAS AUTOMATION, INC.
TROUBLESHOOTING
SERVICE MANUAL
VF-SERIES
4
1.3 ACCURACY
Before you complain of an accuracy problem, please make sure you follow these simple dos and donts.
l Dont ever use a wiggler test indicator for linear dimensions. They measure in an arc and have sine/cosine errors over
larger distances.
l Dont use magnetic bases as accurate test stops. The high accel/decel of the axis can cause them to move.
l Dont attach test points to the sheet metal of the spindle head or table.
l Dont check for thermal growth with an indicator on a long extension magnetic base.
l Do insure that test indicators and stops are absolutely rigid and mounted to machined casting surfaces.
l Do check a suspected error with another indicator or method for verification.
l Do ensure that the indicator is parallel to the axis being checked to avoid tangential reading errors.
l Do center drill holes before using jobber length drills if accuracy is questioned.
l Once machining practices have been eliminated as the source of the problem, determine specifically what the machine
is doing wrong.
´ Machine will not interpolate a round hole.
l Check the levelness of the machine (See the Installation Manual).
l Check for backlash ("Servo Motors/Leadscrews" section).
´ Bored holes do not go straight through the workpiece.
l Check the levelness of the machine (See the Installation Manual).
l Check for squareness in the Z axis.
´ Machine bores holes out-of-round.
l Check the levelness of the machine (See the Installation Manual).
l Check the sweep of the machine ("Spindle Sweep Adjustment").
´ Bored holes are out of round or out of postion.
l 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.
´ Machine mis-positions holes.
l Check the levelness of the machine (See the Installation Manual).
l Check for backlash ("Servo Motors/Leadscrews").
l Check the squareness of the X axis to the Y axis.
´ Machine leaves large steps when using a shell mill.
l Check the levelness of the machine (See the Installation Manual).
l Check the sweep of the machine ("Spindle Sweep Adjustment").
l Cutter diameter too large for depth of cut.

Haas VF Series Specifications

General

Machine Type	Vertical Machining Center
Control	Haas CNC Control
Z-Axis Travel	20-30 inches (varies by model)
Y-Axis Travel	16 - 30 inches (varies by model)
Spindle Motor	20-30 hp (depending on model)
Tool Capacity	20-40 tools (varies by model)