In a message dated 10/19/2005 9:29:20 A.M. Central Daylight Time,
prashantfordwivedi@... writes:
simple & cheap method
Use a fine small drill-press, spindle rotating AT LEAST 3600 RPM, preferably
12,000 or more! Suggest a thin rubber mat on the drill-press work-surface
so the board will not slip around. Use solid-carbide drill-bits made
specifically for PCB drilling. (all have 0.125" dia. shanks.) Reconditioned bits
in boxes of 50 are available nowadays for 1/4 to 1/3 the "new price".
HSS bits will simply not last for more than a dozen holes in FR-4
(fiber-glass epoxy). Carbide will last for 2000 holes before becoming dull, but they
are SO brittle that they will break LONG before they become dull,
particularly if you move the work-piece under the drill-spindle "by hand".
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