Designing of printed circuit board is not as easy as it may seem to be! Therefore, number of rules & regulations are followed for designing the boards by the PCB design companies in order to get the respective layouts-as quality can make a drastic difference.
Circuit boards can be designed in two forms single sided and double sided. But as far as possible, companies prefer single sided because circuitry can be routed easily with the use of jumpers on these boards, as compared to the double sided boards. Moreover, double sheets also causes price hike of 1 to 2 times more than single sided boards. Hence, so far companies prefer these as the cheapest PCB for making out consumer products.
Panelization plays a major role in reducing the cost of making PCBs. This is because of the prominent fact that it helps to save up 80% to 90% of PCB lamination. However, if not done so, wastage up to50 % would occur which is not at all worthwhile. Therefore, usually manufacturers prefer standard sizes that comprise of dimension 40 inches * 48 inches.
The basic rule of the Printed Circuit Board is to use a small panel size during its layout to achieve the best output of the fabrication. Few points taken into considerations in relation to size are spacing, track width and various other constraints.
The basic role when it comes to drilling is keeping it simple as much as possible. Therefore, utilization of machine is not preferred much as it would be raising the price of board. Common drill bit sizes are preferred by the companies while designing of boards which comprise of 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.2 mm, 1.5 mm, 2.0 mm and 3.0 mm. Changing these drill bits are avoided because making changes by machine takes a lot of time that eventually causes an effect on the cost of PCB.
Likewise, printed company adhere the rule for the reduction in holes and types holes, similarly they also make it a note to have minimize track width and spacing. For example, for designing of 0.3 mm width, they make use of 0.5 mm and similarly, for spacing they use 0.5 mm, when 0.3 mm is required. Eventually, this would help yield a productive printed circuit board during the fabrication period with an effective cost.