FLEXLINE-CAD_INM.pdf - 第117页

B-1 A ppendix B T ransformation 1. Defini tions CAD coordinate sy stem: The coordinate syst em that a CAD package uses to describe the orient ation and l ocation of integrated circuit s (ICs) on a PCB. Flexline CAD coord…

A-19

4. The circuit layout offset and circuit outer dimensions of matrix PWB are defined on the

second PWB section definition screen. In the "Section Layout", select "Line Range" and

enter 16 in the "Start Line" and 18 in "End Line." In the "Field Layout", select "Field."

Figure A-31 Section Definition screen (PWB 2)

 Click the "Next" button.

5. Set the Circuit Layout Offset X, Circuit Layout Offset Y, and Circuit Dimensions X/Y. Set the

Circuit Layout Offset X, Circuit Layout Offset Y, and Circuit Dimensions X/Y.

Figure A-32 Field definition screen (PWB 2)

B-1

Appendix B Transformation

1. Definitions

CAD coordinate system: The coordinate system that a CAD package uses to

describe the orientation and location of integrated circuits

(ICs) on a PCB.

Flexline CAD coordinate system: The standard coordinate system as shown below:

In short, this is a coordinate system on the basis of the

transport direction from “Left to Right” of the Front reference.

Front reference

Reference pin

Origin of

di t

Transport direction

Figure B-1 FlexlineCAD Coordinate System

Machine coordinate system: Four difference coordinate systems that any JUKI SMT

machine uses to reference and place ICs on a PCB, namely:

● Transport direction from “Left to Right” of the Front

reference

● Transport direction from “Right to Left” of the Front

reference

● Transport direction from “Left to Right” of the Rear

reference

● Transport direction from “Right to Left” of the Rear

reference

Right-hand rotation rule: Counterclockwise angles are positive and clockwise angles

are negative.

Right-angle coordinate system: The angle between any two of the X, Y, and Z coordinate

axes = 90°.

Reference hole coordinates

Reference hole

Transport direction

B-2

2. Overview

Computer Aided Design (CAD) software packages use different coordinate systems to describe

the location and orientation of components (ICs) placed on a PCB. On the other hand, JUKI's

SMT machines use the said four systems in the transport direction. The PCB reference

coordinate is interpreted by the PCB transport reference (Front, or Rear) and PCB transport

direction (“Right to Left,” or “Left to Right”). Thus, the need for geometric transformation

between coordinate systems is significant.

Flexline CAD provides a mechanism to transform both top and bottom CAD coordinate system

to the Flexline CAD coordinate system. Furthermore, Flexline CAD can transform from Flexline

CAD coordinate system to any of the four possible machine coordinate systems. As a result of

the two-stage transformation (CAD coordinate system / Flexline CAD coordinate system then

Flexline CAD coordinate system / machine coordinate system), Flexline CAD is capable of

transforming any CAD coordinate system to any of the machine coordinate systems. This

document describes the techniques that Flexline CAD adapts in transforming between different

coordinate systems.

3. Transforming CAD coordinate system to machine coordinate system

CAD coordinate system transforms to the Flexline CAD coordinate system, then Flexline CAD

coordinate system transforms to machine coordinate system.

3.1 Transforming CAD coordinate system to Flexline CAD coordinate system

Transforming CAD coordinate system to Flexline CAD coordinate system is implemented by

taking the following two operation steps:

1. Unit conversion

When each of the CAD coordinate system and the Flexline CAD coordinate system uses a

different unit system related to dimensions and angle, unit conversion is executed.

2. CAD top PCB perspective \ Flexline CAD coordinate system or CAD bottom PCB

perspective \ Flexline CAD coordinate system

Flipping the X-axis around the Y-axis is a transformation that produces a mirror image of the

X-axis about the Y-axis. Flipping the Y-axis around the X-axis is a transformation that

produces a mirror image of the Y-axis about the X-axis.

Translating CAD coordinate system is done by repositioning its origin point along a straight

line path from one coordinate location to another by adding the translation distance.

However, Flexline CAD uses the origin point of Flexline CAD coordinate system ((0, 0) point

of Flexline CAD coordinate system) to be the destination point of translation.

The following two equations transform (X, Y) point to (X', Y') where (c, b) is a translation

distance from the CAD coordinate system to the Flexline CAD coordinate system.

(Ox, Oy): Offset point.

a = 0, +1 or -1. b = 0, +1 or -1.

% is a remainder, and

θ ′ is the angle of rotation for the top components.

X ′ = a X + b Y + (X+ OX)

′ = b X + a Y + (Y+ OY)

θ ′ = (k θ + j 360 °) % 360 °