HEIDENHAIN ND 710 Manuale utente
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Position Display Units
for Milling Machines
User’s Manual
HEIDENHAIN
Position display
(ND 710 only two axes)
∆= Distance-to-go display
R+/– = Radius compensation
Numericalinput
• Change the algebraic sign
• Call the last dialog
• In the parameter list:
change parameters
Call radius compensation
of the current tool
• Select special functions
• In the list of special functions
page forward
• Cancel entry
• Reset the operating mode
• Zero the selected axis
(if activated in P80)
• Select parameters
CL plus two-digit number
Status display:
SCL = Scaling factor
->❘❘<- = Touching the edge /
centerline
R = Radius/diameter
display
• Select datum 1 or 2
• Page backward in the list of
specialfunctions
• Page backward in the list of
parameters
1 2 Datum 1 or 2
SET = Datum setting
REF = blinking:
Traverse the
reference points.
On continuously:
Reference points
have been traversed.
Inch = Display in inches
•Select coordinate axes
(ND 710 only X and Y)
•Select axis-specific operating parameters
• Confirm entry
• In the parameter list
page forward
Part I Operating Instructions
3
This manual is for the ND display units with the
following software numbers or higher:
ND 710 for two axes AA00
ND 750 for three axes AA00
About this manual
This manual is divided into two parts:
TeilI: OperatingInstructions
• Fundamentals of positioning
• ND functions
Teil II: Installation and specifications
• Mounting the display unit on the machine
• Description of operating parameters
Part I Operating Instructions
Fundamentals 4
Switch-On, Traversing the Reference Points 9
Datum Setting 10
Tool Compensation 13
Moving the Axes with Distance-To-Go 14
Bolt Hole Circles and Bolt Circle Segments 16
Linear Hole Patterns 19
Working with a Scaling Factor 22
Error Messages 23
Part II
Installation and
Specifications Page 25
4
Y
X
Z
+Y
+X
+Z
–Z –Y
–X
Datum or
origin
Graduation
Fundamentals
Fundamentals
You can skip this chapter if you are already familiar with
coordinate systems, incremental and absolute dimensions,
nominal positions, actual positions and distance-to-go.
Coordinate system
To describe the geometry of a workpiece, the
Cartesian*
coordinate
system is used. The Cartesian coordinate system consists of three
mutually perpendicular axes X, Y and Z. The point of intersection of
these axes is called the datum or origin of the coordinate system.
Think of the axes as scales with divisions (usually in millimeters) which
allow us to fix points in space referenced to the datum.
To determine positions on a workpiece, the coordinate system is
“laid”onto the workpiece.
The machine axes are parallel to the axes of the coordinate system.
The Z axis is normally the tool axis.
1) Named in honor of the French mathematician and philosopher
RenéDescartes (1596 to 1650)
5
Datum setting
The workpiece drawing is used as the basis for machining the
workpiece. To enable the dimensions in the drawing to be converted
into traverse distances of machine axes X, Y and Z, each drawing
dimension requires a datum or reference point on the workpiece
(since a position can only be defined in relationship to another
position).
The workpiece drawing always indicates one absolute datum (the
datum for absolute dimensions). However, it may contain additional
relative datums.
In the context of a numerical position display unit,
datum setting
means bringing the workpiece and the tool into a defined position in
relation to each other and then setting the axis displays to the value
which corresponds to that position. This establishes a fixed
relationship between the actual positions of the axes and the
displayed positions.
You can set 2 absolute datum points and store them in nonvolatile
memory.
0
325
450
700
900
950
0
320
750
1225
300±0,1
0
150
-150
0
0
216,5 250
-250
-125
-216,5
0
-125
-216,5
-250
250
125
216,5
125
Relative
datums
Fundamentals
Absolute
datum
6
Absolute workpiece positions
Each position on the workpiece is uniquely defined by its absolute
coordinates.
Example Absolute coordinates of position 1:
X = 10 mm
Y = 5 mm
Z = 0 mm
If you are working according to a workpiece drawing with absolute
dimensions, then you are moving the tool to the coordinates.
Y
X
Z
10
5
1
Fundamentals
1
Y
X
Z
10
510
10
1
2
Relative workpiece positions
A position can also be defined relative to the previous nominal
position. The datum for the dimension is then located at the previous
nominal position. Such coordinates are termed relative coordinates or
chain dimensions. Incremental coordinates are indicated by a
preceding I.
Example Relative coordinate of position 2referenced to
position 1:
IX = 10 mm
IY = 10 mm
If you are working according to a workpiece drawing with incremental
dimensions, then you are moving the tool by the dimensions.
Signforincrementaldimensioning
A relative dimension has a positive sign when the axis is moved in the
positive direction, and a negative sign when it is moved in the
negative direction.
7
Nominal position, actual position and distance-to-go
The position to which the tool is to move is called the nominal
position (
S
). The position at which the tool is actually located at any
given moment is called the actual position (
I
).
The distance from the nominal position to the actual position is called
the distance-to-go (
R
).
Sign for distance-to-go
When you are using the distance-to-go display, the nominal position
becomes the relative datum (display value 0). The distance-to-go is
therefore negative when you move in the positive axis direction, and
positive when you move in the negative axis direction.
Fundamentals
Y
X
Z
IS
R
8
Positionencoders
The position encoders on the machine convert the movements of the
machine axes into electrical signals. The ND display unit evaluates
these signals, determines the actual position of the machine axes and
displays the position as a numerical value.
If the power is interrupted, the relationship between the machine axis
positions and the calculated actual positions is lost. The reference
marks on the position encoders and the REF reference mark
evaluation feature enable the ND to quickly re-establish this
relationship again when the power is restored.
Reference marks
The scales of the position encoders contain one or more reference
marks. When a reference mark is crossed over, a signal is generated
which identifies that position as a reference point (scale datum =
machine datum).
When this reference mark is crossed over, the ND's reference mark
evaluation feature (REF) restores the relationship between axis slide
positions and display values which you last defined by setting the
datum. If the linear encoders have distance-coded reference marks,
you only need to move the machine axes a maximum of 20 mm to do
this.
Y
X
Z
Workpiece
Positionencoder
Scale in Distance-coded
Linear encoder Reference marks
Reference marks
Fundamentals
9
Switch-On, Traversing the Reference Marks
ENT...CL
Turn on power (switch located on rear panel).
REF and decimal points in status display blink.
Confirm reference traverse mode. REF remains
on continuously. Decimal points blink.
Cross over the reference marks in all axes (in any
sequence). Each axis display becomes active
when its reference mark is crossed over.
0 è1
ENT
Crossing over the reference marks stores the last relationship
between axis slide positions and display values for datum points 1 and
2 in nonvolatile memory.
Note that if you choose
not
to traverse the reference marks (by
clearing the dialog ENT ... CL with the CL key), this relationship will be
lost if the power is interrupted or when the unit is switched off.
Switch-On, Traversing the Reference Marks
If you wish to use multipoint axis error compensation you
must traverse the reference marks (see “Multipoint axis error
compensation”)!
10
DatumSetting
If you want to save the datum points in nonvolatile memory,
you must first cross over the reference marks.
Only after crossing over the reference marks can you set new datums
or activate existing ones.
Select datum 1 or 2.
Datum Setting
There are two ways to set datums:
Touch the workpiece with the tool and then set the desired datum
(see example). You can also touch two edges and set the centerline
between them as a datum. The tool data of the tool used for this are
automatically considered (see “Tool Compensation”).
After you have set a datum it can be activated as follows:
Y
X
2
1
Z
R=5 mm
Datum setting with the tool
Example:
Working plane X / Y
Tool axis Z
Tool radius R = 5 mm
Axis sequence X –Y –Z
for datum setting
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