Haas VF Series Service Manual

1-15-96 96-8100
1
TABLE OF CONTENTS
HAAS AUTOMATION, INC.
TROUBLESHOOTING
SERVICE MANUAL
VF-SERIES
TROUBLESHOOTING
This section is intended for use in determining the solution to a known problem. Solutions given are intended to give the
individual servicing the CNC a pattern to follow in, first, determining the problems source and, second, solving the problem.
The troubleshooting tips are organized in this section according to the area of the CNC that may be giving sign of a problem.
(Ex.: Out-of round circles in drilling will be found under the heading General Machine Operation - Accuracy).
If the problem you are experiencing cannot be found under the heading you expect, please try several other possible head-
ings. If the problem is still not found, contact Haas Automation for further details.
BEFORE YOU BEGIN:
USE COMMON SENSE
Many problems are easily overcome by correctly evaluating the situation. All machine operations are composed of a
program, tools, and tooling. You must look at all three before blaming one as the fault area. If a bored hole is chattering
because of an overextended boring bar, dont expect the machine to correct the fault. Dont suspect machine accuracy if the
vise bends the part. Dont claim hole mis-positioning if you dont first center-drill the hole.
FIND THE PROBLEM FIRST
Many mechanics tear into things before they understand the problem, hoping that it will appear as they go. We know this
from the fact that more than half of all warranty returned parts are in good working order. If the spindle doesnt turn,
remember that the spindle is connected to the gear box, which is connected to the spindle motor, which is driven by the
spindle drive, which is connected to the I/O BOARD, which is driven by the computer. The moral here is dont replace the
spindle drive if the belt is broken. Find the problem first; dont just replace the easiest part to get to.
DONT TINKER WITH THE MACHINE
There are hundreds of parameters, wires, switches, etc., that you can change in this machine. Dont start randomly changing
parts and parameters. Remember, there is a good chance that if you change something, you will incorrectly install it or break
something else in the process. Consider for a moment changing the processors board. First, you have to download all
parameters, remove a dozen connectors, replace the board, reload and reconnect, and if you make one mistake or bend one
tiny pin it WONT WORK. You always need to consider the risk of accidentally damaging the machine anytime you work on
it. It is cheap insurance to double-check a suspect part before physically changing it. The less work you do on the machine
the better.

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)

Summary

TROUBLESHOOTING

BEFORE YOU BEGIN

General advice and preparatory steps before troubleshooting.

1. GENERAL MACHINE OPERATION

Topics related to general machine operation and common issues.

2. SPINDLE

Troubleshooting procedures related to the spindle assembly.

3. SERVO MOTORS/SCREWS

Diagnosing issues with servo motors, lead screws, and related components.

4. AUTOMATIC TOOL CHANGER

Troubleshooting common problems with the automatic tool changer.

7. ALARMS

Understanding and interpreting machine alarms for diagnosis.

MECHANICAL SERVICE

1. HEAD COVERS REMOVAL / INSTALLATION

Detailed instructions for removing and installing machine head covers.

2. TOOL RELEASE PISTON ASSEMBLY

Procedures for the removal and installation of the tool release piston assembly.

3. BELT ASSEMBLY

Steps for the removal, installation, and tension adjustment of the drive belt.

4. SPINDLE ASSEMBLY

Procedures for removing and installing the spindle assembly and its components.

5. TOOL CLAMP/UNCLAMP SWITCH ADJUSTMENT

Adjusting tool clamp/unclamp switches and drawbar height.

6. SPINDLE ORIENTATION

Steps for performing and verifying spindle orientation.

8. SPINDLE MOTOR & TRANSMISSION

Procedures for removing and installing spindle motors and transmissions.

9. X-AXIS MOTOR REMOVAL / INSTALLATION

Guides for removing and installing the X-axis motor.

10. LEAD SCREW REMOVAL AND INSTALLATION

Procedures for lead screw removal and installation across axes.

11. BEARING SLEEVE REMOVAL AND INSTALLATION

Steps for removing and installing bearing sleeves for axes.

12. AUTOMATIC TOOL CHANGER

Procedures for various ATC components and alignments.

13. GRID OFFSET CALCULATION

Method for calculating and setting grid offsets for machine axes.

ELECTRICAL SERVICE

1. SOLENOIDS

Information and procedures for air solenoid assemblies.

2. LINE VOLTAGE ADJUSTMENTS

Guide for adjusting the machine's line voltage settings.

3. FUSE REPLACEMENT

Procedures for replacing fuses in the electrical cabinet.

4. PCB REPLACEMENT

Guides for replacing major circuit boards like Microprocessor and Video.

5. FRONT PANEL

Procedures for replacing components on the front control panel.

6. SPINDLE ENCODER REPLACEMENT

Steps for removing and replacing the spindle encoder.

TECHNICAL REFERENCE

1. TOOL CHANGER

Overview and operation of the automatic tool changer system.

3. SPINDLE OPERATION

Details on spindle speed, orientation, and sequences.

4. SERVOS BRUSH / BRUSH

Information on servo motor characteristics and types.

PARAMETERS

PARAMETER LIST

Comprehensive list of machine parameters and their definitions.

ASSEMBLY DRAWINGS

VF-1 BASE

Exploded view and part list for the VF-1 base assembly.

VF-GEARBOX ASSEMBLY

Exploded view of the VF-series gearbox assembly.