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What is the definition of machine zero?

The position located at the farthest possible distance in a positive direction along the machine axes. This position is permanently set for each particular CNC machine.
Learn more about machine zero in the class "Haas Mill: Control Panel Overview 250" below.

Haas Mill: Control Panel Overview 250

CNC Controls: Haas Training

Class Information

ToolingU.com classes are offered at the beginner, intermediate, and advanced levels. The typical class consists of 12 to 25 lessons and will take approximately one hour to complete.

Class Name:	Haas Mill: Control Panel Overview 250
Description:	This class describes the various sections of the Haas mill control panel as well as the steps for powering up, powering down, and homing the machine. *Includes Haas CNC Simulators.*
Prerequisites:	300130 300150 300200 300210
Difficulty:	Intermediate
Number of Lessons:	21
Language:	English, Spanish

Below are all the competencies and job programs that contain the class Haas Mill: Control Panel Overview 250. Job programs are our traditional class lists organized according to common job functions. Competencies are our latest job-specific curricula that help tie online learning to practical, hands-on tasks.

Click on any title to view its details.

Class Outline
Objectives Intro to the Haas Control The Control Panel The Control Keypad Display Keys: Top Row Display Keys: Bottom Row Operation Modes Alpha and Numeric Keys Special Characters Overrides Cursor Keys Jog Keys Function Keys Reset Keys Powering Up Zero Return Mode Activating Coolant Activating the Chip Conveyor Leaving Messages Powering Down Summary

Class Objectives

Compare the Haas CNC control to controls from other manufacturers.
Describe the Haas CNC control.
Identify the different areas of the control panel.
Differentiate between display keys.
Differentiate between operation mode keys.
Identify the location of the Alpha and Numeric keys on the control keypad.
Describe special characters.
Define overrides.
Identify the location of the cursor keys on the control keypad.
Distinguish between various jog keys.
Differentiate between function keys.
Identify the location of the reset keys on the control keypad.
Demonstrate knowledge of the powering up sequence.
Identify the function of the zero return mode.
Demonstrate knowledge of activating coolant.
Describe how to activate the chip conveyor.
Explain how to leave a message.
Demonstrate knowledge of the powering down sequence.

Class Vocabulary
+10 FEEDRATE		An override key on the Haas control that increases the current feed rate in 10% increments. Together, -10 FEEDRATE, +10 FEEDRATE, and 100% FEEDRATE allow an operator to make adjustments to tool feeds.
+10 SPINDLE		An override key on the Haas control that increases the current spindle speed in 10% increments. Together, -10 SPINDLE, +10 SPINDLE, and 100% SPINDLE allow an operator to make adjustments to spindle speeds.
+A		A jog key that rotates machine components around the A-axis in a positive direction. Not all Haas mills are equipped with a fourth A-axis.
+B		A jog key that rotates machine components around the B-axis in a positive direction. Not all Haas mills are equipped with a fifth B-axis.
+X		A jog key that moves the spindle along the X-axis in the positive direction.
+Y		A jog key that moves the spindle along the Y-axis in the positive direction.
+Z		A jog key that moves the spindle along the Z-axis in the positive direction.
-10 FEEDRATE		An override key on the Haas control that decreases the current feed rate in 10% increments. Together, -10 FEEDRATE, +10 FEEDRATE, and 100% FEEDRATE allow an operator to make adjustments to tool feeds.
-10 SPINDLE		An override key on the Haas control that decreases the current spindle speed in 10% increments. Together, -10 SPINDLE, +10 SPINDLE, and 100% SPINDLE allow an operator to make adjustments to spindle speeds.
100% FEEDRATE		An override key on the Haas control that sets the feed rate back to 100% of the programmed value. Together, -10 FEEDRATE, +10 FEEDRATE, and 100% FEEDRATE allow an operator to make adjustments to tool feeds.
100% RAPID		An override key on the Haas control that allows the machine spindle to move at its maximum rate of travel.
100% SPINDLE		An override key on the Haas control that sets the spindle back to 100% of the programmed value. Together, -10 SPINDLE, +10 SPINDLE, and 100% SPINDLE allow an operator to make adjustments to spindle speeds.
25% RAPID		An override key on the Haas control that limits rapid traverse to 25% of maximum.
5% RAPID		An override key on the Haas control that limits rapid traverse to 5% of maximum.
50% RAPID		An override key on the Haas control that limits rapid traverse to 50% of maximum.
-A		A jog key that rotates machine components around the A-axis in a negative direction. Not all Haas mills are equipped with a fourth A-axis.
Alarm 176		An alarm code on the Haas control that indicates the machine is experiencing an overvoltage condition. Alarm 176 initiates auto-shutdown after 4.5 minutes.
Alarm 177		An alarm code on the Haas control that indicates the machine is experiencing an overheating condition. Alarm 177 initiates auto-shutdown after 4.5 minutes.
ALARM/MESGS		The display key on the Haas control that shows the current alarms when pressed once and messages when pressed twice.
alpha keys		The area of the control keypad that allows an operator to enter letters and special characters into the control.
AUTO ALL AXES		In zero return mode, the key that returns and initializes all axes to machine zero.
Auto Power Off Timer		Setting 1. A setting that indicates how many minutes of idle time must lapse before the machine is automatically turned off.
AUX CLNT		A jog key that turns on the Through Spindle Coolant system when in MDI mode. Pressing this key again shuts off the system.
-B		A jog key that rotates machine components around the B-axis in a negative direction. Not all Haas mills are equipped with a fifth B-axis.
block delete		A machine control that provides the option of skipping a predetermined series of program blocks. A block delete allows the operator to run two versions of the same program.
bracket		[ ]. Punctuation marks used to separate CNC program commands from user comments.
CANCEL		A key on the Haas control that backspaces the cursor to delete the last character entered or cancels any program block that is highlighted during a block edit.
CCW		An override key on the Haas control that starts the spindle in the counterclockwise direction.
chip auger		A rotating shaft with a helical blade that removes chips from the machine.
chip conveyor		A moveable belt that helps to remove chips from the machine.
CHIP FWD		A jog key that causes the chip auger to remove chips from the machine.
CHIP REV		A jog key that causes the chip auger to move in the opposite direction.
CHIP STOP		A jog key that causes the chip auger to stop.
CIRCLE-CIRCLE TANGENT calculator		A machining calculator that helps an operator calculate points of intersection between two circles or points.
CIRCLE-LINE TANGENT calculator		A machining calculator that helps an operator calculate points of intersection where a circle and a line meet as a tangent.
CIRCULAR calculator		A machining calculator that helps an operator solve problems involving circular motion.
CLNT DOWN		A jog key that causes the coolant nozzle to move one position lower.
CLNT UP		A jog key that causes the coolant nozzle to move one position higher.
CNC control		A combination of software and hardware that directs the operation of a CNC machine.
control keypad		The main part of the Haas control panel consisting of nine areas of keys that allow an operator to input information into the Haas control.
control panel		The group of controls on a CNC machine that run, store, and edit the commands of a part program and other coordinate information.
coolant		A substance that is used to prevent a workpiece from reaching excessively high temperatures during machining.
Coolant Override		Setting 32. A setting that controls how the coolant pump operates.
CURNT COMDS		The display key on the Haas control that shows fifteen lines of the current program, modal program values, axis positions, and the position during runtime.
cursor keys		The area of the control keypad that allows an operator to move through various screens and fields in the control, edit and search for CNC programs, and move the cursor up, down, left, and right through the program or screen options.
CW		An override key on the Haas control that starts the spindle in the clockwise direction.
CYCLE START		The control button used to begin a program or continue a program that has been previously stopped.
diagnostic		Information that is vital to routine machine maintenance.
Direct Numerical Control		The direct control of CNC machines by a large central host computer. With DNC, the program is run directly from the memory of a host computer and is not stored in the memory of the machine's own control.
display keys		The area of the control keypad that allows the operator to show different information, such as offsets, machine settings, and the current program.
display screen		The main screen of the machine that displays important information for the operator.
EDIT		An operation mode key that allows manual editing changes in a program or the creation of new program in memory.
EMERGENCY STOP		Used for emergencies only, the control button that automatically shuts down all machine functions.
END		A cursor arrow key that moves a program quickly to its end or moves to the bottom of most displays.
EOB		End of Block. A key on the Haas control that signals the end of a program block. EOB is represented by a semicolon on the display screen.
feed		The rate at which the cutting tool and the workpiece move in relation to one another.
FEED HOLD		The control button used to pause a program. FEED HOLD pauses tool feed but does not stop spindle movement.
function keys		The area of the control keypad that allows an operator to perform different functions depending on which display and mode are selected.
HANDLE		A rotating knob on the Haas control panel that moves the machine components along the axes. The handle "clicks" in controlled, measured increments that an operator selects on the keypad.
HANDLE CONTROL FEEDRATE		An override key on the Haas control that allows the operator to adjust the programmed feed rate at 1% increments using the HANDLE.
HANDLE CONTROL SPINDLE		An override key on the Haas control that allows the operator to adjust spindle speed in 1% increments using the HANDLE.
HANDLE JOG		An operation mode key that allows for the manual operation of tool movement via the handwheel or jog buttons.
help		Information intended to answer operator questions and solve common problems with machine function.
HELP/CALC		The display key on the Haas control that brings up an information manual when pressed once and various machining calculators when pressed twice.
HOME		A cursor arrow key that moves a cursor quickly to its beginning or moves to the top of most displays.
home position		Another name for machine zero, the position located at the farthest possible distance in a positive direction along the machine axes. This position is permanently set for each particular CNC machine.
input buffer		A temporary location at the lower left corner of the computer screen that holds all incoming information before it continues to the CPU for processing.
Jog Handle to Single Block		Setting 104. A setting that, when activated, allows an operator to use the jog handle to single step through a program.
jog keys		The area of the control keypad that allows an operator to move a selected axis.
JOG LOCK		A jog key that, when pressed simultaneously with a specific axis jog key, moves the axis in a continuous motion without the need to hold down the axis key. Another press of JOG LOCK stops jogging motion.
LIST PROG		An operation mode key that lists programs and allows an operator to select, send, receive, and delete programs.
M codes		A code used to signal an action from a miscellaneous group of commands. M codes change cutting tools, turn on or turn off the coolant, spindle, or workpiece clamps, etc.
M08		An M code that turns coolant on.
M09		An M code that turns coolant off.
M88		An M code that turns on high-pressure coolant through the spindle.
machine zero		The position located at the farthest possible distance in a positive direction along the machine axes. This position is permanently set for each particular CNC machine.
macro statement		A customized programming shortcut created by a programmer.
Manual Data Input		An operation mode that allows an operator to manually enter and execute blocks of programming code at the control panel.
MDI/DNC		An operation mode key that lets an operator either enter and execute program data without disturbing stored data when pressed once, or execute programs from a centrally located computer storage device when pressed twice.
MEM		An operation mode key that runs part programs from the control's memory.
MILLING/TAPPING calculator		A machining calculator that helps an operator calculate any of a number of variables, including surface feet per minute, cutter diameter, revolutions per minute, feed, thread pitch, chip load, and the number of flutes.
NEXT TOOL		A function key that is used to select the next tool only after pressing TOOL OFSET MESUR while in the OFSET display and HANDLE/JOG mode.
numeric keys		The area of the control keypad that allows an operator to enter numbers and special characters into the control.
OFFSET		The display key on the Haas control that shows the various programmed offsets.
offsets		A numerical value stored in the CNC controls that repositions machine components. Offsets are used to adjust for variations in tool geometry, part size, tool wear, etc.
operation mode keys		The area of the control keypad that allows an operator to choose a particular operating mode, which in turn indicates what tasks the machine will perform.
overrides		The area of the control keypad that adjusts a programmed speed or feed rate by a certain percentage during operation.
PAGE DOWN		A cursor arrow key that changes displays or moves down one program page.
PAGE UP		A cursor arrow key that moves one page up in the displays or moves up one program page.
PARAM/DGNOS		The display key on the Haas control that shows machine parameters when pressed once and diagnostics when pressed twice.
parameters		One of the limits or physical properties that determine function and operation of a CNC machine.
parentheses		( ). Curved brackets used to separate program text information from CNC program commands.
part program		A series of instructions used by a CNC machine to perform the necessary sequence of operations to machine a specific workpiece.
PART ZERO SET		A function key that is used to automatically enter work coordinate offsets during part setup.
POSIT		The display key on the Haas control that brings up different pages listing machine axis positions of the spindle.
power down		The act of turning off the machine.
POWER OFF		The red button on the upper left of the Haas control panel that shuts off power to the machine.
Power Off at M30		Setting 2. A setting that powers down a machine when the program reaches an M30 code.
POWER ON		The green button on the upper left of the Haas control panel that provides power to the machine.
power up		The act of turning on the machine.
POWER UP/RESTART		A reset key that automatically initializes the machine at power up. After power up, this key can be used to reinitialize the system.
PRGRM/CONVRS		The display key on the Haas control that causes program blocks of the current selected part program to display on the CRT.
rapid		Moving machine components at the fastest possible rate of travel.
rapid traverse motion		The movement of machine components at the fastest possible rate of travel. Rapid traverse motion merely requires an endpoint for the movement.
RESET		A reset key that stops all machine motion and places the program cursor at the top of the current program.
reset keys		The area of the control keypad that executes functions vital to the beginning and end of a machining operation.
SETNG/GRAPH		The display key on the Haas control that lists settings when pressed once and presents dry run information when pressed twice.
setting		A CNC machine control function that an operator can activate, deactivate, or change to suit specific machining conditions.
Setting 1		Auto Power Off Timer. A setting that indicates how many minutes of idle time must lapse before the machine is automatically turned off.
Setting 104		Jog Handle to Single Block. A setting that, when activated, allows an operator to use the jog handle to single step through a program.
Setting 2		Power Off at M30. A setting on the Haas control that powers down a machine when the program reaches an M30 code.
Setting 32		Coolant Override. A setting that controls how the coolant pump operates.
Setting 81		Tool at Power Down. A setting that indicates which tool will occupy the spindle when the machine is powered down.
SPACE		A key on the Haas control that enters a space in the input buffer.
speed		The rate that the cutting tool or workpiece moves at the point of contact.
SPINDLE LOAD meter		A meter located on the Haas control panel that indicates the power draw on the spindle during machine operation. Machines are rated to handle a certain spindle load over a certain time period.
STOP		An override key on the Haas control that stops the spindle.
Through the Spindle Coolant		A system on the Haas mill that is activated by the AUX CLNT button when in MDI mode.
Tool at Power Down		Setting 81. A setting that indicates which tool will occupy the spindle when the machine is powered down.
TOOL CHANGER RESTORE		A reset key that restores the tool changer to normal operation if the tool changer has encountered an interruption during a tool change. The key initiates a user prompt screen to assist the operator in recovering from a tool changer crash.
tool length offset		An offset used on the machining center that accounts for variations in tool length along the Z-axis.
TOOL OFSET MESUR		A function key that is used to enter the present Z-location for the tool length offsets in the offset page during part setup.
TOOL RELEASE		A function key that releases the tool from the spindle when in the MDI, handle jog, or zero return mode.
TRIG calculator		A machining calculator that helps an operator make calculations involving the measurements and relationships of a triangle and its parts.
WRITE/ENTER		A key on the Haas control that acts as a general enter key. WRITE/ENTER also acts as an insert key during editing.
-X		A jog key that moves the spindle along the X-axis in the negative direction.
-Y		A jog key that moves the spindle along the Y-axis in the negative direction.
-Z		A jog key that moves the spindle along the Z-axis in the negative direction.
ZERO RET		An operation mode key that searches for machine zero or rapid returns to machine zero automatically.