By Charles Hamilton
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Extra resources for A Guide to Printed Circuit Board Design
So the designer must be aware and look for below-minimum clearance as above, always bearing in mind the scale being worked to. In those cases where the design minima cannot be achieved, the design layout must be adjusted accordingly. On no account should pads be cut to increase below-minimum gaps. ). 025 in) at 1:1. 063in) at 1:1 (but not less than the thickness of the laminate used). 063in) at 1:1 (but not less than the thickness of the laminate used). With all of the pads laid and the design minima observed, the tracks can now be laid.
In this respect, the layout scale will probably be the most appropriate for the solder side conductor pattern — particularly if there are a large number of holes to identify with letter codes. The letter codes and board periphery are added in ink to the solder side conductor pattern view on the front face of the drawing, together with the outline dimensions of the PCB. 1). 006in) positional tolerance diameter from TP, and supported by a prominent note: HOLE POSITIONS 0 0,161 M A S T E R PATTERN S O L D E R SIDE This can be achieved by the manufacturer using numerically controlled drilling methods.
Finally, on cutting, the craft tool must be handled with respect by the user, with particular care being taken when changing blades. 6 T a p i n g o n t e r m i n a t i n g pads The craft tool must never be left lying around in the drawing-office as a hazard to the unwary. Also, when used blades are discarded, they must never be just thrown into waste bins, but must first have the cutting edge rendered harmless, either by wrapping with draughting tape or similar method. Observance of these simple rules will eliminate the danger of accidents in the drawing-office resulting from the use of the craft tool.
A Guide to Printed Circuit Board Design by Charles Hamilton