HEIDENHAIN ND 710 User Manual v.3

User’s Manual

ND 710

ND 750

Position Display Units for Milling Machines

English (en) 12/2001

Position display	• Select coordinate axes
(ND 710 only two axes)	(ND 710 only X and Y)
	• Select axis-specific operating parameters

Status display:

SET = Datum setting REF = blinking:

Traverse the reference points. On continuously: Reference points

have been traversed. D = Distance-to-go display 1 2 Datum 1 or 2

Inch = Display in inches

SCL = Scaling factor

-> <- = Touching the edge / centerline

R = Radius/diameter HEIDENHAIN display

R+/– = Radius compensation

•Select datum 1 or 2

•Page backward in the list of special functions

•Page backward in the list of parameters

Numerical input

•Change the algebraic sign

•Call the last dialog

•Edit parameters in the list of parameters

•Confirm entry

•Page forward in the list of parameters

Call radius compensation of the current tool

•Select special functions

•Page forward in the list of special functions

•Cancel entry

•Reset the operating mode

•Zero the selected axis (if activated in P80)

•Select parameters:

CL plus two-digit number

This manual is for the ND display units with the following software numbers or higher:

ND 710 for two axes	246 271-07
ND 750 for three axes	246 271-07

About this manual

This manual is divided into two parts:

Part I: Operating Instructions

•Fundamentals of positioning

•ND functions

Part 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		19
Moving the Axes with Distance-To-Go		20
Bolt Hole Circles and Bolt Hole Circle Segments		22
Linear Hole Patterns		25
Working with a Scaling Factor		28
Error Messages		29
Part II
Installation and	Page 31
Specifications	and following

Part I Operating Instructions

3

	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.

4	1)	Named in honor of the French mathematician and philosopher
		René Descartes (1596 to 1650)

+Y +Z

Graduation

+X

–X	Datum or
	origin

–Z –Y

Z

Y

X

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 9 absolute datum points and store them in nonvolatile memory.

1225

750

320

0

Absolute datum

-250	-216,5	-125	0	125	216,5	250
						216,5	250
						125
						0
						-125
						-216,5	-250

150 0

300±0,1	-150			Relative
	0			datums
0	325	450	700	900 950

Fundamentals

5

Fundamentals

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.

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 2 referenced 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.

Sign for incremental dimensioning

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.

Z

Y

X

1

5 10

Z

Y	2
	10

10

X

11

5

10

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.

Z

S

I

R

Y

X

Fundamentals

7

Fundamentals

8

Position encoders

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.

	Z
Y	Workpiece
	X
	Position
	encoder

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.

Scale in	Distance-coded
linear encoder	reference marks

Reference mark

Switch-On, Traversing the Reference Marks

0 1	Turn on power (switch located on rear panel).
	REF and decimal points in status display blink.

ENT...CL

ENT	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.

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	9
compensation”)!

Datum Setting

Datum Setting

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.

In P70, you can select:

•Two datum points: The selected datum

is displayed via 1 or 2

•Nine datum points: The selected datum is displayed in the lowest axis via d1 to d9.

There are several ways to set datums:

Touch the edge of the workpiece with the tool and then set the desired datum. You can also touch two edges and set the centerline between them as a datum, or touch the inside of a circle and set the circle center as a datum (see examples). The tool data of the tool used for this are automatically considered (see “Tool Compensation”).

To call a datum point you have set, proceed as follows:

You have set two datum points in P70:

Select datum 1 or 2.

You have set nine datum points in P70:

Press the datum key (“d” blinks).

Enter a datum number (1 to 9).

1ENT

10

Probing a workpiece edge to find a datum

The ND display units support the following probing functions:

“PROBE EDGE”

Setting a workpiece edge as datum.

“PROBE MIDPOINT” Setting a midpoint between two workpiece edges as datum.

“PROBE CIRCLE”

Setting the center of a circle as datum.

The probing functions are accessible in the SPEC FCT mode of operation.

The functions “PROBE EDGE”, “PROBE MIDPOINT” and “PROBE CIRCLE” are described on the following pages.

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

Z

R=5mm

Y

X

1

2

Datum Setting

11

Datum Setting

Probing a workpiece edge to find a datum

Select a datum number (see page 10).

SPEC

FCT

SPEC or

FCT

PROBING

ENT

PROBE EDGE

ENT

X

•

•

Select the special functions.

Select the “probing function.”

Confirm selection.

Confirm “Probe edge.”

Select the X axis (if not already selected). SET lights. The <- status symbol starts to blink.

PROBE X

ENT

(appears only briefly))

Touch workpiece edge 1 with the tool.

X position is captured. “SET edge“ appears briefly. SET starts to blink. Retract tool from workpiece.

The <- status symbol lights.

0	•	ENT	Enter position value for the datum.
			Tool radius is automatically
	•		compensated.
	•

YSelect the Y axis. SET lights.

The <- status symbol starts to blink.

PROBE Y (appears only briefly)

Touch workpiece edge 2 with the tool.

•

•

12

Y position is captured. “SET

ENT edge“appears briefly. SET starts to blink. Retract tool from workpiece.

The <- status symbol lights.

Enter position value for the datum in the 0 ENT Y axis. Tool radius is automatically

compensated.

Z	Select the Z axis. SET lights.	1)
	The <- status symbol starts to blink.

PROBE Z (appears only briefly)

Touch workpiece surface with the tool.

Z position is captured. “SET edge“

ENT appears briefly. SET starts to blink.

Retract tool from workpiece.

The <- status symbol lights.

•

•

1) only with ND 750

0ENT

SPEC	or CL
FCT

Enter position value for the datum in the Z axis.

After setting the datum, exit the probing funtions.

Datum Setting

13

Datum Setting

Probing workpiece edges to find a midpoint datum
		Z
The edges to be probed run parallel to the Y axis.
Follow the procedure below for all midpoints between two edges:
		Y	2
		Select a datum number (see page 10).
		1	M
			X?
			X
	SPEC	Select the special functions.
	FCT
SPEC	or	Select the probing function.
FCT

PROBING

Confirm selection.

ENT

•

•

•

14