Model Sb-408 semi-auto bench tapping machine is a high-efficiency tapping equipment, suitable for parts batch productiong in manufacture of instrument, electric appliance, sewing machine and camera, etc. The maxiumum diameter to be tapped is M8. 1. The special motor for high-frequnency clockwise and conter-clockwise ratation is adopted and max, tapping ftrquency is 50 times per miunte. 2. The feed mechanism with clearance spring is driven by change-gears and is suitable for excruding taps. 3. The tappping depth can be adjusted addutely by the tapping-depth-stop. 4. The soft tap holder is adopted by the machine, so the tap can be easily exchanged and reliably clamped. 5. The main drive and feed drive system are separatel driven by friction clutch, when troubles in processing, the drive chain is automatically cut off. So the tap is protected and undamaged. 6.The emergency stop button is fixed on the most convenient position, and safety device on the change gears' cover. Thus the operater's safety is guaranteed. 7.The main electric elements of the machine are selected from well-known brand products of reliable performance, in order the guarantee the machine's long service-life. All of the electric elements are assembled under the working table, which is on the machine base. As a result, it makes easy maintenance possible. Specifications             　Max. tapping diameter 8 mm 　Max. tapping frequency 50 times/minute 　Distance from axis of spindle to column generating line 185 mm 　Max.Distance frome spindle nose to working surface of base 　 355 mm 　Min.Distance frome spindle nose to working surface of base 50 mm 　Max. travel of spindle box 260mm 　Max. travel of spindle 45 mm 　Outer taper of spindle nose D4 short taper 　Spindle speed 1340,750,420rpm 　Effective working area of table 230×226 mm 　Main drive motor power 0.4 kW 　Weight（approx） 105 kg 　Overall dimensions （L×W×H） 675×390×800 mm