7.0Mm Jobber Drill Bit - Silver Series

Product Description

 Alpha Silver Series 7.0mm Jobber Drill Bit When you go to buy a drill bit, what are you needing ? Just a drill ? or do you actually want HOLES ? DRILL FEATURES M2 HSS Fully ground M2 HSS material increases drill life 118 Degree Split Point cuts faster and reduces wandering Click here to find your closest Alpha Distributor. TECHNICAL DATA Overall Length 109mm Flute Length 69mm Stainless Steel RPM 543 Tool Steel RPM 815 Cast Iron RPM 1086 Malleable Iron RPM 1222 Medium Carbon Steel RPM 1358 Free Cutting Steel RPM 1901 Alum, Brass, Plastic RPM 2716 Wood RPM 4074 Feed per RPM (mm / rev) .015-.25 Standard pack Qty 5 DRILLING PRACTICE The flute form, web thickness and split point of the standard Alpha drills are suitable for most materials forming fine chips. For effective drilling, the rigidity of the drilland work piece are most important. The shorter the flute length the more rigid the drill. Long drills must be adequately supported to reduce vibration. The following are important in drill use : Clamp the work piece securely Select the correct speed and feed Use an appropriate coolant or lubricant Ensure the shank is securely held. Avoid using worn drill chucks as the drill may slip during use. Regrind the point or replace the drill before it dulls, do not force a worn drill. When deep hole drilling, withdraw frequently to clear the chips ( deep holes start at 4X the diameter) For stainless steel, manganese and high tensile steels, do not allow the drill to swell as it will cause work-hardening. Use a slower speed and heavier feed for these materials.