... supplied with each new job and should contain the following information to ensure that the finished board is to your requirements. - Always required | PRINTED CIRCUIT BOARDS ONLINE | even when a drill file is supplied, to enable inspection of panels immediately after drilling and finished boards prior to despatching. Hole sizes must be | PRINTED CIRCUIT BOARDS ONLINE | clearly represented with distinct differences between each size. Tolerances are not required unless different to our standard of +0.1 / -0.05 mm. - Preferred with | PRINTED CIRCUIT BOARDS ONLINE | overall mechanical dimensions including notches, cutouts and slots. Also preferred is a positioning (datum) dimension (drilled hole is best). Tolerances are not required unless different | PRINTED CIRCUIT BOARDS ONLINE | to our standard of + / -0.25 mm. Other information required for all boards includes: board thickness (standard = 1.6mm) base copper thickness (std = | PRINTED CIRCUIT BOARDS ONLINE | 18mm) solder mask colour (std = green) solder mask type (std = liquid photoimageable) component legend colour (std = white) bare board testing requirement (std | PRINTED CIRCUIT BOARDS ONLINE | for multilayer and fine line ...
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... control-depth positioning, and high-velocity positioning tables can process several panels simultaneously to achieve higher throughput and lower processing costs. Mechanical drilling is an effective | PRINTED CIRCUIT BOARDS ONLINE | method for hole diameters larger than 0.010" (250 microns). Below 0.010", however, operational costs rise exponentially. For example, a manufacturer might get 5,000 hits per | PRINTED CIRCUIT BOARDS ONLINE | drill bit when forming 0.008" or 0.010" vias but only 1,000 hits per bit for 0.006" vias. However, recent advances in mechanical drilling technology such | PRINTED CIRCUIT BOARDS ONLINE | as high-speed spindles (Figure 4a and 4b) have increased drill bit life two to three times over previous generations of mechanical drills. And since the | PRINTED CIRCUIT BOARDS ONLINE | PCBs can be stacked, it is possible for mechanical drills to be similar to laser drills in productivity. The minimum hole size economically manufactured by | PRINTED CIRCUIT BOARDS ONLINE | mechanical drills currently seems to be 0.006". To drill holes smaller than 0.006" would require alternate hole formation technology. There are current R&D ...
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... even when a drill file is supplied, to enable inspection of panels immediately after drilling and finished boards prior to despatching. Hole sizes must | PRINTED CIRCUIT BOARDS ONLINE | be clearly represented with distinct differences between each size. Tolerances are not required unless different to our standard of +0.1 / -0.05 mm. - Preferred | PRINTED CIRCUIT BOARDS ONLINE | with overall mechanical dimensions including notches, cutouts and slots. Also preferred is a positioning (datum) dimension (drilled hole is best). Tolerances are not required unless | PRINTED CIRCUIT BOARDS ONLINE | different to our standard of + / -0.25 mm. Other information required for all boards includes: board thickness (standard = 1.6mm) base copper thickness (std | PRINTED CIRCUIT BOARDS ONLINE | = 18mm) solder mask colour (std = green) solder mask type (std = liquid photoimageable) component legend colour (std = white) bare board testing requirement | PRINTED CIRCUIT BOARDS ONLINE | (std for multilayer and fine line production runs) Extra information required for multilayers includes: special dielectric spacing requirements (if important) copper thickness of ...
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