Tom
10-14-2002, 02:45 PM
IPC Advanced Study Guide Page Reference: Page 285, Section 5.2
The fabrication panel arrays may also be removed using a “V” groove cutter and then breaking the boards from the fabrication panel. V-groove requirements should include the consideration for the remaining web (based on board thickness), the maximum angle permitted, and the board edge smoothness.
See Diagram Below Where:
A = the Web material remaining between the two (2) ‘V’ scores on a plane perpendicular to the printed board surface
B = the distance the center of a web is offset from true center within the printed board.
C = the blade offset is the distance the top and bottom scoring blades are offset from one another.
D = the width of a score line at the surface
E = the scoring blade total angle ± 2°
F = the “Keep out” area, expressed from nominal score line placement, that no features should be placed within.
G = the overall printed board thickness to be scored
H = the trueness/position condition based on the tolerance of two or more score lines on one side of the printed board. Measured from nominal, squareness, and actual position.
The fabrication panel arrays may also be removed using a “V” groove cutter and then breaking the boards from the fabrication panel. V-groove requirements should include the consideration for the remaining web (based on board thickness), the maximum angle permitted, and the board edge smoothness.
See Diagram Below Where:
A = the Web material remaining between the two (2) ‘V’ scores on a plane perpendicular to the printed board surface
B = the distance the center of a web is offset from true center within the printed board.
C = the blade offset is the distance the top and bottom scoring blades are offset from one another.
D = the width of a score line at the surface
E = the scoring blade total angle ± 2°
F = the “Keep out” area, expressed from nominal score line placement, that no features should be placed within.
G = the overall printed board thickness to be scored
H = the trueness/position condition based on the tolerance of two or more score lines on one side of the printed board. Measured from nominal, squareness, and actual position.