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钻床和夹头 Drilling a hole through metal is one of the most basic machining tasks. However, there are many interacting variables associated with successful execution thus requiring careful consideration of: the material to be drilled, setup rigidity, bit design, bit material, sharpness, length, RPM, feed rate, chip removal, heat, & lubrication. Drill bits, Reamers & Counter Bores How to drill a hole Guide for Cutting Speeds & Feeds for Drills Machinist Calculator CAUTION: Always clamp the piece to the table before drilling. Do not hold by hand. Standard drills will grab soft metals like brass, lift the work piece, even with a small vise, & dangerously spin them at high speed. Clamp or bolt down the part. Assure that the drill press head & table are locked onto the column, too.Using a mill with a clamped part & fine down feed is a safer method to drill soft metals. Wear Eye Protection Rong Fu RF-25 Mill Drill  The DRO-equipped Rong Fu RF-25 mill is also an excellent drill press. It is massive, rigid, precise, powerful, has a 110 to 2600 RPM speed range, & is equipped with a large (75-lbs.), strong, high-clamping pressure milling vise. A wide variety of precision work-holding fixtures are available. R-8 Accessories Mill Accessories Drill Bits  An R-8 mounted Super Chuck (?" ~ ?" or 3mm ~ 16mm), turning at a high speed, on the RF-25 Mill. Floor Drill Press  Sixteen speed, 16.5" swing, floor-standing Jet drill press. The low, 200 RPM speed is good for drilling larger holes. Its uses a removable MT2 (Morse taper) to JT3 chuck arbor. This type of arbor arrangement allows mounting the Jacobs ball bearing, 0" ~ ?" (0mm ~ 13mm), Super Chuck. The low-cost chuck arbors come in a large number of size combinations allowing adaptation of almost any chuck to a given spindle An adjustable work-stop peg fits into a table slot. See the Jet JDP-17 drill press manual.   16 speeds: 200, 290, 350, 430, 500, 580, 640, 720, 800, 870, 1440, 1630, 1820, 2380, 2540, & 3630 RPM
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