1, when tapping the end face of the orifice to chamfer; tap hole coaxial to the workpiece; tapping should begin applying axial pressure on the tap to cut, cut a few laps after applying axial force is no longer needed.

     2, when the tap calibration screw partially into each half circle forward to going back in a circle of 1/4, 1/2 laps, the chips chopped down after the attack; during capture vias should always exit Taps were chip.

     3, on the steel workpieces to add cutting fluid when tapping on the cast iron workpieces tapping, you can add a little kerosene; after the attack with his head, and then the second attack, when three attack must be screwed into the threaded hole tap.

     4, when threading the workpiece to be chamfered ends, pull teeth face should be perpendicular to the axis of the workpiece; wire sets to be applied at the beginning of the axial pressure, turn the pressure corresponding to a large number; pull teeth when the workpiece cut thread, you do not add pressure.

     5, when the wire sets for the chips broken off, discharge timely reversal should always pull teeth.

     6, the workpiece should be firmly fixed in the clip, the fixtures; When taps broken, do not break out a hand to touch the place with a clamp-like chisel or punch excised, we must wear protective goggles when broken wire.

Notes tapping
     (A) on the workpiece to be chamfered bottom outlet orifice threads, threaded through holes are chamfered at both ends.
     (2) work clamp position to be correct, as far as possible into the threaded hole centerline horizontal or vertical position, so that tapping is easy to determine whether a plane perpendicular to the axis of the tap workpiece.
     (3) When tapping began, to try to put a positive tap, then tap plus the pressure and turn the twist hand, when cut into 1-2 laps, carefully check and correct the position of the tap. When cut into 3-4 laps general thread, tap location should be correct. Later, simply turn the twisted hand, and should not increase the pressure on the tap, otherwise thread form will be damaged.
     (4) When tapping, hand twist every turn wrench 1 / 2-1 laps, it should reverse approximately half circle, so that chips easily broken rear exhaust, and reduce the cutting edge because of sticky crumbs leaving taps rolling lived phenomenon.
     (5) does not make sense when the screw attack, should always exit the tap, excluding hole chips.
     (6) tapping screw plastic material, to add lubricating coolant. For the steel material, usually with a higher concentration of oil or require larger available vegetable oil or an emulsion such as molybdenum disulfide. For stainless steel, available on the 30th oil or curing oil.
     (7) tapping process after switching to a tap, to hand out first screwed already tapping screw in, until no longer precession, then twist lever switch. After the attack at the end of the cone exit, avoid fast rotating cutter hand, the best hand to spin out, to ensure that the thread has been tapping good quality is not affected.
     (8) machine tapping, tap and screw to maintain coaxial.
     (9) machine tapping, tap calibration part not all succeed, otherwise when the anti-car exit taps will produce chaos teeth.