03217917-01-01E By DEK Technical Reference Manual Vol 1_enPDFA.pdf - 第283页

17 CAMERA SYSTEM MODULE 17.5 CALIBRATIONS AND CHECKS TECHNICAL REFERENCE MANUAL Vol 1 E By DEK 04/2019 283 ► Place a non-magnetic rule flat against the board edge and slide a second rule so that it abuts it and comes wit…

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17 CAMERA SYSTEM MODULE
17.5 CALIBRATIONS AND CHECKS
282 TECHNICAL REFERENCE MANUAL Vol 1 E By DEK 04/2019
17.5 CALIBRATIONS AND CHECKS
17.5.1 Board Stop X Offset Check
WARNING
BOARD CLAMPS. EXTREME CARE MUST BE EXERCISED WHEN WORKING IN
THE TOOLING AREA OF THE MACHINE TO AVOID INJURY. THE FOILS ON THE
FRONT AND REAR BOARD CLAMPS ARE VERY SHARP.
► Select Open Cover Commands.
► Select Carriage To Rear.
► Select Unload Screen.
► Open the printhead cover.
► Remove the stencil.
► Close the printhead cover.
► Press the System button.
► Select Back.
► Select Maintenance.
► Select Diagnostics.
► Using the Next or Previous button highlight Camera Axes.
► Select Select Module.
► Using the Next or Previous button highlight Home Camera X Axis.
► Select Run Diagnost.
► Using the Next or Previous button highlight Home Camera Y Axis.
► Select Run Diagnost.
► Using the Next or Previous button highlight Drive to Board Stop Position.
► Select Run Diagnost.
► Select Exit.
► Using the Next or Previous button highlight Rail System.
► Select Select Module.
► Using the Next or Previous button highlight Toggle Board Stop.
► Select Run Diagnost.
► Open the printhead cover.
► Place a board onto the rails and move it up against the board stop.
► Close the printhead cover.
► Press the System button.
► Using the Next or Previous button highlight Toggle Board Clamp.
► Select Run Diagnost.
► Using the Next or Previous button highlight Toggle Board Stop.
► Select Run Diagnost.
► Select Exit.
► Using the Next or Previous button highlight Camera Axes.
► Select Select Module.
► Using the Next or Previous button highlight Initialise Vision System.
► Select Run Diagnost.
► Select Exit.
► Open the printhead cover.
17 CAMERA SYSTEM MODULE
17.5 CALIBRATIONS AND CHECKS
TECHNICAL REFERENCE MANUAL Vol 1 E By DEK 04/2019 283
► Place a non-magnetic rule flat against the board edge and slide a second rule so that it abuts
it and comes within the camera field of view.
1
2
2
B
A
2
3
2
4
A Plan View 2 Metric Ruler
B Side View 3 Board
1 Camera Board Stop 4 Camera
► On the vision monitor, record the distance from the board edge to the approximate centre of
the square (figure below refers). This value is the Board Stop X Offset and should be
-43.5mm ±0.5mm.
45
43 4644
NOTE
The numerals on the rule may not be directly in the field of view, move the rule until the numerals
are visible in the vision window. Lay the rule flat on the board, do not lift or angle it as this can dis-
tort the measurement. As the board stop is before the camera the distance is recorded as a minus
reading.
► Remove the rule from the machine.
► Close the printhead cover.
► Press the System button.
► Select Exit.
► During Initialisation, remove the board from the transport rails when prompted.
17 CAMERA SYSTEM MODULE
17.5 CALIBRATIONS AND CHECKS
284 TECHNICAL REFERENCE MANUAL Vol 1 E By DEK 04/2019
► Select Continue.
► Select Back.
► Select Maintenance.
► Select Machine Setup.
► Select Basics.
► Select Board Stop X Offset.
► Enter the dimension recorded earlier (should be -43.5mm ±0.5mm).
► Select Accept.
► Select Back.
► Select Back.
► Select Back.
17.5.2 Vision System Calibration
For the vision alignment to function accurately a full system calibration is required. This should be
carried out by the maintenance personnel at the required period.
The calibration of the vision system is carried out in two stages using a calibration stencil (Part No.
134764) and a calibration board (Part No. 134765).
The first stage, Calibrate Vision, details the calibration of X, Y and Theta.
Calibrate Video X, Y calculates the stencil movement in millimetres to vision system pixels. This is
achieved by looking up at the calibration stencil fiducials and moving the stencil in the X and Y dir-
ections by a fixed amount, for each of the 25 fiducials.
The movements are calculated for each fiducial and the mean taken. This average stencil move-
ment is recorded and used as part of the calibration data.
Calibrate Theta calibrates the stencil theta movement. The camera selects three stencil fiducials
and the stencil moves in theta (using the two X axes and implementing +2mm in X rear and -2mm
in X forward to achieve the theta movement). The movements are calculated for each fiducial and
the average taken. The data is recorded and the calibration is complete.
The second stage, Calibrate Offset is to compensate for any optical discrepancies of the telecentric
camera between viewing up and down. This is achieved by printing the calibration stencil and
measuring the differences between the centroid of the stencil fiducials and the centroid of the prin-
ted fiducials. The average of these differences are calculated, recorded and used as part of the
calibration data.
17.5.2.1 Calibration Procedure
NOTE
The vision height adjustment must be carried out prior to calibrating the vision system.
The calibration sequence is as follows:
●
Stage 1 - Calibrate Vision
●
Stage 2 - Calibrate Offset
17.5.2.2 Stage 1 - Calibrate Vision
NOTE
ASM recommends that the calibration board and stencil are cleaned with Isopropyl Alcohol (IPA)
impregnated lint free wipe prior to calibrating vision or offset.
► Select Maintenance.
► Select Machine Setup.
► Ensure that the Screen Size parameter is set to 265.
► Select Back.
► Select Back.
► Select Setup Product.
► Select Load Product.