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Pr oduc t Ch ang e Ov er User Re f eren ce Manu al 4022 591 960 82 6-78 FCM M ult ifle x 02.02 ▼ For which components d o you use this algo rithm F or com ponen t s that d o n ot hav e a g ood r efl ection i mag e (l ea …
4022 591 96082 User Reference Manual
02.02 FCM Multiflex 6-77
Product Change Over
6.7.4.4 Used Measuring Algoritms
The RECTANGLE algorithm
▼ How does it work
1. Find the rough centre and angle of the reflecting areas.
2. Measure the North-South vertical size and centre.
3. Measure the North and South horizontal size, and update the position of the
horizontal centre of the component with these measured values.
4. Check the component’s vertical and horizontal size, and place rulers. The rulers
will be placed on the following positions: The center of the component found by
step 2 and 3, incremented by the vertical size - or horizontal size, depending on
the component’s orientation - divided by two, and decremented by the ruler
offset.
5. Execute a vertical or a horizontal optimization, depending on whether the
component is a vertical or a horizontal rectangle, see below.
▼
Vertical optimization
The most Northern and the most Southern position will be measured at which hori-
zontal rulers will be drawn. Now the optimized centre and angle are calculated.
▼
Horizontal optimization
The most Eastern and the most Western position will be measured at which vertical
rulers will be drawn. Now the optimized centre and angle are calculated.
FIGURE 6-27 The RECTANGLE algorithm measuring aspects
Ruler
Ruler
Ruler-offset
Ruler-offset
Vertical size / 2
Vertical size / 2
NORTH
SOUTH
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User Reference Manual 4022 591 96082
6-78 FCM Multiflex 02.02
▼ For which components do you use this algorithm
For components that do not have a good reflection image (lead ends, or body), like:
• Transformer coils, 0402, 0603, etc.;
• Tantals with no good reflection (brown, dark colours);
• MELFs with no good reflection (black colour).
▼
General important information
• This algorithm is not as critical as the CHIP algorithm.
• The ruler offsets are fixed; this means that they are not adjustable in the SMD
info file.
The CHIP algorithm
▼ How does it work
1. Find the rough centre and angle of the reflecting areas.
2. Measure the North-South vertical size, and update the vertical component
centre’s position.
3. Find the edges by the North-South ruler, and place the horizontal rulers with a
ruler offset.
4. Measure the horizontal size of the component’s North side.
5. Measure the horizontal size of the component’s South side.
NOTE: To find a component with the CHIP algorithm, all six crosspoints must be
correct!
FIGURE 6-28 The CHIP algorithm measuring aspects
Ruler
Ruler
Ruler-Offset
Ruler-Offset
NORTH
SOUTH
4022 591 96082 User Reference Manual
02.02 FCM Multiflex 6-79
Product Change Over
▼ For which components do you use this algorithm
For components that have a good reflection image (lead ends, or body), like:
• 0402, 0603, etc.;
• Yellow tantals;
• MELFs with good reflection.
▼
General important information
• This algorithm is more critical than the RECTANGLE algorithm. This means it
needs a better/sharper vision image of the component.
• Ruler offsets are adjustable in the SMD info file; normally the value 3 is used
for most components (5 or 7 is also possible if you have components with a
bigger lead width). Ruler offset is in pixels; one pixel = 75x 75 µm. Always
use odd ruler widths in order to get valid mean calculation results.
The SOT algorithm
▼ How does it work
1. Find the first and last lead of the South side (for a SOT, normally more than one
lead).
2. Find the first and last lead for the other side.
3. Measure all lead sides (edges) for both component sides (North/South).
4. Measure all lead ends for both component sides (North/South).
5. Chech the pitch between the leads (if there is more then one lead a side).
FIGURE 6-29 The SOT algorithm measuring aspects
Ruler
Ruler
Ruler offset
Ruler offset
Lead edge
Lead end
Search area Fine-search area
Fine-search area
SOUTH
NORTH