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#1
 
07-13-2011, 11:22 AM
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WHEN DRILLING A .007 DIA. HOLE IN 4140 STEEL, USING AN MA-FORD 3 FLUTE MICRO DRILL,IVE ALWAYS DRILLED STRAIGHT THROUGH WITH NO PECK TO A DEPTH OF .06 MAX. NOW I WILL BE DRILLING .085 DEEP.6000RPM MAX SPEED.SHOULD I STILL DRILL THROUGH WITH NO PECK?  |
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