Haas TL Series Installation guide

Haas Factory Outlet
A Division of Productivity Inc
Revised 06-2012
CNC Lathe Series
Training Manual
Haas TL Series
Tool Room Lathe Operator

This Manual is the Property of Productivity Inc
The document may not be reproduced without the express written permission of
Productivity Inc.
The content must not be altered, nor may the Productivity Inc name be removed
from the materials.
This material is to be used as a guide to operation of the machine tool. The
Operator is responsible for following Safety Procedures as outlined by their
instructor or manufacturer’s specifications.
To obtain permission, please contact trainingmn@productivity.com.

Tool Room Lathe Operator Training Manual
Table of Contents
THE CARTESIAN COORDINATE SYSTEM........................................................................................................4
MACHINE HOME POSITION ................................................................................................................................7
THE HAAS CNC CONTROL .................................................................................................................................9
CONTROL DISPLAY............................................................................................................................................10
KEYBOARD INTRODUCTION............................................................................................................................11
1–FUNCTION KEYS ...........................................................................................................................................12
2–JOG KEYS .....................................................................................................................................................12
3–OVERRIDE KEYS ...........................................................................................................................................13
4–DISPLAY KEYS ..............................................................................................................................................14
5–CURSOR KEYS ..............................................................................................................................................18
6AND 7–ALPHA KEYS AND NUMERIC KEYS .......................................................................................................18
8–MODE KEYS ..................................................................................................................................................20
SETTINGS ............................................................................................................................................................23
TOOL ROOM LATHE ORIENTATION AND WALK AROUND .........................................................................24
POWER-UP PROCEDURES ..................................................................................................................................25
TOOL ROOM LATHE SAFETY...........................................................................................................................27
EMERGENCY STOP SWITCH ................................................................................................................................27
PROPER USE OF MACHINE GUARDING................................................................................................................28
DEAD MAN SWITCH ............................................................................................................................................28
HAND WHEEL SAFETY ........................................................................................................................................29
MAINTENANCE OF THE TL SERIES LATHE ...........................................................................................................30
HEADSTOCK LUBRICANT .....................................................................................................................................31
GREASE POINTS .................................................................................................................................................31
ALORIS TOOL POST OPERATION.........................................................................................................................32
3JAW SCROLL JAW CHUCK OPERATION ............................................................................................................33

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 2
HAAS INTUITIVE PROGRAMMING SYSTEM (IPS).........................................................................................34
TOOL OFFSETS TAB ...........................................................................................................................................39
DEFINING TURNING TOOLS .................................................................................................................................42
DEFINING DRILLS,REAMERS,ETC......................................................................................................................43
TURN &FACE TAB ..............................................................................................................................................44
IPS RECORDER FEATURE ..................................................................................................................................46
FACE CUTTING CYCLE ........................................................................................................................................47
RADIUS CYCLE MENU .........................................................................................................................................50
GROOVE CUTTING CYCLE ..................................................................................................................................51
THREAD CUTTING CYCLE ...................................................................................................................................52
DRILL CYCLE ......................................................................................................................................................53
TAPPED HOLE CYCLE .........................................................................................................................................54
SECTION II –IPS WALK-THROUGH FOR LATHES........................................................................................59
SECTION III –TL LIVE IMAGES FOR LATHES................................................................................................99
For more information on Additional Training Opportunities or our Classroom Schedule,
Contact the Productivity Inc Applications Department in Minneapolis:
'763.476.8600
Visit us on the Web: www.productivity.com
Click on the Training Registration Button
*trainingmn@productivity.com

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 3
Introduction to Basic TL Series Lathe Operation
Welcome to Productivity, Inc., the Haas CNC Machine Tool Distributor for your local area. As part of your
company’s Haas CNC purchase, standard lifetime training is included as long as your company owns the
machine.
What we plan on covering in this one-day class is the operation and programming of the unique features
of the Haas TL- Series Tool Room Lathes.
These lathes are unique in their own way as they are designed for manual, semi-manual, and full CNC
G&M code operation. Even though the TL series can be run from a G&M code program, Haas has
equipped these unique machines with a unique control. The Haas IPS (Intuitive Programming System)
allows for quick and easy setup and programming of standard tool room style parts.
Since the TL series is so unique, Productivity, Inc. had designed a specific class just for the TL series to best
suit its unique features.
If you or your company would like to learn more about G&M code programming to take even more
advantage of the Haas control equipped on the TL series of lathes, we would suggest the next step - Lathe
Programming after completing this course.
Revised 063012-CK

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 4
The Cartesian Coordinate System
The first diagram we are concerned with is called a NUMBER LINE. This number line has a reference point
zero that is called ABSOLUTE ZERO and may be placed at any point along the line.
Fig-1 - 1 Horizontal number line –Z Axis
The number line also has numbered increments on either side of absolute zero. Moving away from zero
to the right are positive increments. Moving away from zero to the left are negative increments. The "+",
or positive increments, are understood, therefore no sign is needed.
We use positive and negative along with the increment's value to indicate its relationship to zero on the
line. In the case of the previous line, if we choose to move to the third increment on the minus (-) side of
zero, we would call for -3. If we choose the second increment in the plus range, we would call for 2. Our
concern is with distance and direction from zero.
Remember that zero may be placed at any point along the line, and that once placed, one side of zero has
negative increments and the other side has positive increments.
Fig.1-2 Vertical Number Line –X Axis

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 5
The next illustration (Fig. 1-3) shows the two directions of travel on a TL Series Lathe. To carry the number
line idea a little further, imagine such a line placed along each axis of the machine.
Figure 1-3
The first number line is easy to conceive as belonging to the left-to-right, or “Z”, axis of the machine. If we
place a similar number line along the front-to-back, or “X”, axis, the increments toward the operator are
the positive increments, and the increments on the other side of zero away from the operator are the
negative increments.
The zero position may be placed at any point along each of the two number lines, and in fact will probably
be different for each setup of the machine. It is noteworthy to mention that the X-axis is set with the
machine zero position on the center line of the spindle, while the Z axis zero is set at the finished right of
the part being machined. This will place the entire X axis cutting in a positive range of travel, whereas the
Z axis cutting will be in the negative range of travel.
The diagram shows a front view of the grid as it would appear on the lathe. This view shows the X and Z
axes as the operator faces the lathe. Note that at the intersection of the two lines, a common zero point
is established. The four areas to the sides and above and below the lines are called “QUADRANTS”and
make up the basis for what is known as rectangular coordinate programming.

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 6
Fig. 1-4: Operator’s working grid.
Whenever we set a zero somewhere on the X axis and somewhere on the Z axis, we have automatically
caused an intersection of the two lines. This intersection where the two zeros come together will
automatically have the four quadrants to its sides, above, and below it. How much of a quadrant we will
be able to access is determined by where we placed the zeros on the travel axes of the lathe.

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 7
Machine Home Position
The principal of machine home may be seen when doing a manual reference return of all machine axes.
When a zero return (ZERO RET) is performed at machine start up, all axes are moved to the furthest
positive direction until the limit switch is reached. When this condition is satisfied, the only way to move
any of the two axes is in the negative direction. This is because a new zero was set for each of the axes
automatically when the machine was brought Home. Machine home is placed at the edge of each axes
travel.
Sometimes this point is referred to as “Machine Zero”as pointed out below:
Note the difference in the x coordinate system on a turret lathe and a table lathe. Positive X is in
a direction that points toward the operator on the table lathe. This is due to the fact that the
tool is on the opposite side of the part compared to a turret lathe.

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 8
Cartesian Coordinate Exercise
POINT # X Position Z Position
P1 X 5.0 Z 0
P2
P3
P4
P5
P6
P7
P8
P9
P10

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 9
The Haas CNC Control
Powering On the Machine
To power up a Haas machine, regardless of where the machine turret was when it was turned off, press
POWER ON. The machine must first find its fixed machine zero reference point before any operations can
occur. After it's powered on, pressing POWER UP/RESTART will send the machine to its machine zero
reference location. The machine doors must be cycled and closed to return to machine zero. Also the
machine needs to see the Emergency Stop cycled. Haas provides directions on the screen on what needs
to be done to start the machine up in the morning.
When powering on the machine, if there is a message in the MESGS
display, it will be the first display seen on your control screen.
Will move all axis to machine zero and then indexes the turret to tool
#! Machine will move up in X first to machine zero and then the Z
move to machine zero.
If the correct program has been selected and the part program is
proven to be good and it's ready to run, press cycle start.
General Machine Keys
Power On - Turns CNC machine on.
Power Off - Turns CNC machine tool off.
Emergency Stop - Stops all axis motion, stops spindle, tool changer and turns off coolant pump.
Jog Handle –Jogs axis selected, also may be used to scroll through programs, menu items while editing
and also altering feeds and speeds.
Cycle Start –Starts program in run mode or graphics mode.
Feed Hold –Stops all axis motion. Spindle will continue to turn.
Reset –Stops machine, will rewind program.
Power Up/Restart –Axis will return to machine zero and tool change will occur per Setting 81
Recover –If a tool change is stopped in middle of a cycle an alarm will come up. Push the Recover button
and follow the instructions to bring the tool change cycle to the beginning.

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Control Display
The new 16 software has a larger display and more panes than older versions. Above is the basic display
layout. What is displayed depends on which display keys have been used. The only pane active is the one
with the white background. Only when a pane is active may changes be made to data.
Control functions in Haas machine tools are organized in three modes: Setup, Edit and Operation.
Access Modes using the mode keys as follows:
Setup: ZERO RET, HAND JOG keys. Provides all control features for machine setup.
Edit: EDIT, MDI/DNC, LIST PROG keys. Provides all program editing, management, and transfer
functions.
Operation: MEM key. Provides all control features necessary to make a part.
Current mode is displayed at top of display.
Functions from another mode can still be accessed within the active mode. For example, while in the
Operation mode, pressing OFFSET will display the offset tables as the active pane in the Main Display Pane
and offsets may be altered; press OFFSET to toggle the offset display. While running a part in operation
mode another program may be edited in the Main Display Pane. Press PROGRM CONVRS in most modes
to shift to the edit pane for the current active program.

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Keyboard Introduction
The keyboard is divided into eight different sectors: Function Keys, Jog Keys, Override
Keys, Display Keys, Cursor Keys, Alpha Keys, Number Keys and Mode Keys. In addition,
there are miscellaneous keys and features located on the pendant and keyboard which
are described briefly on the following pages.
1
-
Function Keys
2
-
Jog Keys
3
-
Over
ride
5
-
Cursor Keys
4
-
Display Keys
6-Alpha Keys 7-Number Keys
8
-
Mode Keys
HAAS
LATHE
S
ERIES

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 12
1 –Function Keys
F1 –F4 –Perform different functions depending on which mode the machine is in. Example in offsets
mode F1 will directly enter value given it into offset geometry.
X DIAMETER MEASURE –Will take machine X position ask for a diameter measurement on the part
which tool turned and put correct X Geometry in Tool Offsets page.
NEXT TOOL –In set up this will select the next tool and make a tool index.
X/Z - Toggles between X-axis and Z-axis jog modes during a set up.
Z FACE MEASURE –Used to record Z tool offsets and Z work offsets.
2 –Jog Keys
Chip FWD (Chip Conveyer Forward) –Turns the chip conveyer in a direction that removes chips from the
work cell.
Chip STOP (Chip Auger Stop) –Stops chip conveyer movement.
Chip REV (Chip Auger Reverse) –Turns the chip conveyer in reverse.
<-TS –Moves tailstock toward the spindle.
TS Rapid –Increases speed of tailstock movement when used concurrently with the other TS keys.
->TS - Moves tailstock away from spindle.
+X, -X (Axis) Selects the X axis for continuous motion when depressed.
+Z, -Z (Axis) Selects the Z axis for continuous motion when depressed.
Rapid –When pressed simultaneously with X or Z keys will move at maximum jog speed.

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3 –Override Keys
The overrides are at the lower right of the control panel. They give the user the ability to override the
speed of rapid traverse motion, as well as programmed feeds and spindle speeds.
-10 FEED RATE Decreases current feed rate in increments of 10 percent.
100% FEED RATE Resets the control feed rate to the programmed feed rate.
+10 FEED RATE Increases current feed rate in increments of 10 percent.
HANDLE CONTROL FEED RATE Hand wheel will control feed rate at 1% increments.
-10 SPINDLE Decreases current spindle speed in increments of 10 percent.
100% SPINDLE Sets the control spindle speed at the programmed spindle speed
+10 SPINDLE Increases current spindle speed in increments of 10 percent.
HANDLE CONTROL FEED Hand wheel will control feed rate at 1% increments.
CW Starts the spindle in the clockwise direction.
STOP Stops the spindle.
CCW Starts the spindle in the counterclockwise direction.
5% RAPID Limits rapid moves to 5 percent of maximum.
25% RAPID Limits rapid moves to 25 percent of maximum.
50% RAPID Limits rapid moves to 50 percent of maximum.
100% RAPID Allows rapid traverse to feed at its maximum.
Override Usage
Feed rates may be varied from 0% to 999%. Feed rate override is ineffective during G74 and G84 tapping
cycles. Spindle speeds may be varied from 0% to 999%. Depressing Handle Control Feed rate or Handle
Control Spindle keys, the jog handle movement varies by +/-1% increments.
Setting 10 will limit rapid movement to 50%.
Settings 19, 20, 21 make it possible to disable override keys.
Coolant may be over rode by depressing COOLNT button.
Feed Hold - Stops rapid and feed moves. Cycle Start button must be depressed to resume machine feeds.
Similar situation applies when Door Hold appears. Door must be closed and Cycle Start pressed to
continue running program.
Overrides may be reset to defaults with a M06, M30 or pressing RESET by changing Settings 83, 87 and 88
respectively.

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4 –Display Keys
PRGM/CONVRS –Selects the active program pane (highlights in white). In MDI/DNC mode pressing a
second time will allow access to VQC (Visual Quick Code) and IPS (Intuitive Programming System)
POSIT (Position) –Selects the positions display window (lower middle). Repeated pressing of the POSIT
key will toggle through relative positions in the Memory Mode. In Handle Jog mode all four are listed
together.
1. POS-OPER digital display. This is a reference display only. Each axis can be zeroed out independently;
then the display shows the axis position relative to where you decided to zero it. In the Handle Jog
mode, you can press the X, Y or Z JOG keys and ORIGIN key to zero that selected axis. On this display
page, you can also enter in an axis letter and number (X-1.25) and press ORIGIN to have that value
entered in that axis display.
2. POS-WORK digital display. This position display tells how far away the tools are in X, Y and Z from the
presently selected work offset zero point.
3. POS-MACH digital display. This is in reference to machine zero, the location that the machine moves
to automatically when you press POWER UP/RESTART. This display will show the current distance
from machine zero.
4. POS-TO-GO digital display. When you're running the machine, or when you have the machine in a
Feed Hold, this incrementally displays the travel distance remaining in the active program block being
run. This is useful information when you are stepping a program through during a set up.
When the position pane is active one can change which axis is displayed simply by typing X or Y or Z or any
combination and pressing write. Only that particular axis or combination will be displayed.
OFFSET –Selects one of two offsets tables: Tool Geometry/Wear and Work Zero Offset. Depressing the
OFFSET button toggles between the two tables Tool Geometry/Wear table displays 50 tool length offsets
(100 tool length offsets on older machines) - labeled (LENGTH) GEOMETRY - along with wear offsets. It
also displays radius and tool tip type.
The Work Zero Offset table has G54-G59 plus G154 P1 to G154 P99 offsets available.
The WRITE/ENTER key will add the number in the input buffer to the selected offset, and the F1 key
will replace the selected offset with the number entered into the input buffer. Offsets can also be
entered using TOOL OFSET MEASUR and PART ZERO SET

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CURNT COMDS –Ten different pages; use PAGE UP and PAGE DOWN
1. Operation Timers –displays Power-On Time, Cycle Start Time, Feed Cutting Time. Hitting ORIGIN
will clear any display that is highlighted by the cursor.
2. Real time clock and date.
3. System Variables, for machines with Macro Programming.
4. All Active Codes, displays current and modal command values.
5. Position information: Machine, Distance to Go, Operator, Work Coordinate.
6. Tool life, displays the usage of each tool. An alarm can be set for the number of times you want
that tool to be used, and when that condition has been met (that is, the tool has been used the
set number of times), the machine will stop, with an alarm for you to check the condition of that
tool. Pressing ORIGIN will clear the cursor-selected display, and pressing ORIGIN when the cursor
is at the top of a column will clear the whole column.
7. Tool Load displays the Tool Load Max % of each tool being used. You can use the Limit % column
to set the maximum spindle load for a particular tool. When that condition has been met (the tool
has reached maximum load), the machine will stop and alarm out for you to check the condition
of that tool. Pressing ORIGIN will clear the cursor-selected display, and pressing ORIGIN when the
cursor is at the top of a column will clear the whole column. Setting 84 determines the Overload
Action when this limit is met.
Also vibration loads may be entered.
8. Maintenance times for various items may be loaded.
9. Bar Feeder 300 –Haas servo bar system variables displayed
ALARM/MESGS –Displays messages and current active alarms. Press right arrow key gives alarm
history. Press right arrow key again goes to the Alarm Viewer Page. Enter alarm number and press write
will give detailed information on a particular alarm code.
PARAM/DGNOS –Lists machine parameters that are seldom-modified values which change the
operation of the machine. These include servo motor types, gear ratios, speeds, stored stroke limits, lead
screw compensations, motor control delays and macro call selections. All of these are rarely changed by
the user and should be protected by Setting 7, PARAMETER LOCK. A second press of PARAM/DGNOS will
show the diagnostics display. The PAGE UP and PAGE DOWN keys are then used to select one of two
different pages. This display is for service diagnostic purposes, and the user will not normally need them.

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 16
SETNG/GRAPH –Displays settings - machine parameters and control functions that the user may need
to turn on and off or change to suit specific needs. A list of settings is found on page 30.
·Settings are organized into functionally similar page groups with a title.
·Settings are listed with a number and a short description, and a value or choice on the right.
·To find a particular setting, enter the setting number and then press either the up or down cursor
arrow key to move to the desired setting.
·You can change a setting using the left or right cursor arrows to display the choices, or, if the
setting contains a value, by typing in a new number. A message at the top of the screen will tell
you how to change the selected setting. When you changed, it will flash on and off.
·A setting change is not active until it stops flashing. To activate, press WRITE/ENTER.
SETNG/GRAPH (2nd part) - The second press of SETNG/GRAPH will bring up the graphics display in
the Main Display Pane. In this screen you can dry-run a program without moving the axes or risking tool
damage from any programming errors. This function is far more powerful than using DRY RUN, because
all of your offsets and travel limits can be checked before any attempt is made to move the axes. The risk
of a crash during setup is greatly reduced. The Graphics Screen will display the programmed tool path and
generate an alarm if there are any problems. Some of the features of the Graphics display are controlled
by selections made in the Settings display, on the page titled GRAPHICS.
1. Press either MEM or MDI and select the program that you want to run in Graphics. Graphics
will also run in the Edit Mode.
2. Press SETNG/GRAPH twice.
·The top left line of the screen will list the GRAPHICS title. Above that line will list the
mode you are in (MEM or MDI). The bottom lists explanations for use of function
keys F1 through F4.
·The small window on the lower right side of the screen displays the whole table area
during the simulation run, indicating the location of the tool and any zoom window.
The center window of the display is a large window that represents a top-down
perspective of the X and Y axes. This is where the tool path is displayed during graphic
simulation of a CNC program.
3. Press CYCLE START to see all the X and Y-axis moves demonstrated.
Note machine axis and spindle will not when graphic window is up.
4. To step through a program one block at a time in Graphics, press SINGLE BLOCK.
5. F1 is a help key.
6. Press F2 to zoom in on the Graphics view screen.
·Use PAGE DOWN to zoom in further and PAGE UP to expand the view.
·Use the Cursor Keys to position the new zoom window over the area you wish to
zoom in on using the small window in the bottom right hand corner. Pressing HOME
will display the whole table.
·After positioning the desired zoom window, press WRITE/ENTER to accept the view
and CYCLE START to see the new view.
·F3 slows the execution speed of the graphic simulation
·F4 speeds up the execution speed of simulation.
Use SINGLE BLOCK to step through a program in graphics to find any mistakes. During single block you
can re-zoom your window to look at tool paths in tight corners etc. Also use position display to see find
any discrepant values.

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HELP/CALC –Will bring up a help POP UP relevant to the screen you are in. This provides information
only pertaining to that screen. Pressing the HELP/CALC button again brings up a tabbed menu. With
tabulated screens highlighting tab and pressing WRITE/ENTER key will open up respective tab. Pressing
the CANCEL key will close the tab.
Help Opening up the Help tab brings you to the table of contents of the entire Mill Operators
Manual. High light the topic of interest and press WRITE/ENTER will bring up subtopics
on the area of interest. Select subtopic in similar fashion will bring up the relevant page
in the manual.
Search The search tab will do a search of the manuals content for relevant information on a
keyword. Type in the search term and press F1. Topics relevant to the keyword will
appear. Highlight the topic and press WRITE/ENTER key to open.
Drill Table Displays a common drill sizes, decimal information and tap drill sizes.
Calculator Different calculator functions are available under this tab. The calculator gives ordinary
calculations like addition, subtraction, multiplication and division in all tabs. It also will
solve trig problems with information about triangles, circles, circle line tangent and circle-
circle tangent. A milling and tapping tab will give you suggested cutting speeds and feeds
per different materials and sized tools.
Simple
Calculator It will calculate simple addition, subtraction, multiplication and division operations.
Operations
are listed as: LOAD + - * /. These are selected using the left or right cursor arrow.
·To enter a number cursor on to LOAD; type the number you want to load and
press WRITE/ENTER.
·To perform one of the arithmetic functions, enter the first number into the
calculator window. Select the operation you want ( + - * / ). Finally, enter the
second number into the input buffer, press WRITE/ENTER to perform the
calculation.
Milling and
Tapping Help you solve values for feed rates SFM, RPM, and chip load under different
conditions. It uses the three equations related to milling and tapping. The first
one includes cutter diameter with SFM and RPM. The second one includes RPM,
number of flutes, feed rate and chip load. The third one includes thread pitch,
RPM and feed rate.
The Milling & Tapping Tab
MILLING:
Cutter Diameter
1.2500 IN
(entered)
Surface Speed
210.0000 FT/MIN
(entered)
RPM
642
(calcula
ted)
Flutes
4
(entered)
Feed
12.8343 FT/MIN
(calculated)
Chip Load
0.0005 IN
(entered)
TAPPING:
Threads
16.0/IN
(entered)
RPM
500
(entered)
FEED
31.2500 IN/MIN
(calculated)

Productivity Inc –Haas CNC TL Series Lathe Operator Manual Page 18
5 –Cursor Keys
Cursor Keys The cursor keys are in the center of the control panel. They give the user
the ability to move to and through various screens and fields in the control. They are used
extensively for editing and searching CNC programs. They may be arrows or commands.
Up/Down –Moves up/down one item, block or field.
Page Up/Down –Used to change displays or move up/down one page when viewing a program.
HOME –Will move the cursor to the top-most item on the screen; in editing, this is the top left block of
the program.
END –Will take you to the bottom-most item of the screen. In editing, this is the last block of the
program.
6 and 7 –Alpha Keys and Numeric Keys
The Alpha Keys allow the user to enter the 26 letters of the alphabet along with some special characters.
Depressing any Alphabet Key automatically puts that character in the Input Section of the control (lower
left-hand corner).
SHIFT key provides access to the yellow characters shown in the upper left corner of some of
the alphanumeric buttons on the keyboard. Pressing SHIFT and then the desired white
character key will enter that character into the input buffer.
EOB key enters the end-of-block character, which is displayed as a semicolon on the
screen and signifies the end of a programming block. It also moves the cursor to the
next line.
Parentheses are used to separate CNC program commands from user comments. They must
always be entered as a pair. Example: (T1 ½”End Mill)
Also any time an invalid line of code is received through the RS-232 port, it is added to the
program between parentheses.
(–) and (.) These keys are used to define negative numbers and give decimal position.
+ = # * [ ] These symbols are accessed by first pressing the SHIFT key and then the key with
the desired symbol. They are used in macro expressions (Haas option) and in
parenthetical comments within the program.
, ? % $ ! & @ : These are additional symbols, accessed by pressing the SHIFT key, that can be
used in parenthetical comments.
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