CNC Double Column Plano Milling Machine

CNC Double Column Plano Milling Machine


Shenoy Engineering Pvt Ltd has designed a double column vertical Mill/Drill Machine which has a table of 6000 x 1500 mm, stroke of 6230 mm and admit between columns 2000 mm. Apart from heavy vertical and right angle machining, using Ø250 mm cutter, this machine can perform heavy, close pitch drilling operations, using U drills up to Ø50 mm and rigid tapping up to Ø 48 mm. In-built high pressure coolant facilitates quick chip evacuation. The heavily ribbed, 12 mtr long, segmented construction of the bottom base is designed to carry weight of 15 tonnes. Precision ground LM guides and blocks facilitate rapid traverse up to 5 metres per minute, slow cutting speed is as low as 30 mm per minute. The X axis drive system consists of LM guides and Ø100 mm x 16 mm pitch, C3 class ground, preloaded ball screw and ball nut. The X axis traverse is through a combination of 47 Nm servo motor and a 3 arc minute backlash planetary gearbox. The feedback for X axis slide is through a rotary encoder, mounted on X axis ball screw end. Pre-tensing of ball screws for arresting the float, innovative anti-sagging mechanism, metallic telescopic guideway covers, etc., are the other feature. Targeted positioning accuracy is ±10 microns for 300 mm length, maximum being up to 50 microns over the entire length of 6 meters stroke of X axis. Targeted repeatability is ±10 microns. Cross (Y) axis, having 1,800 mm stroke, is bridge type construction and is resting on 2 columns. The axis feed rate is from 30 mm to 5000 mm through 36 Nm motor in combination with ground LM guides and blocks. The feedback is through linear scale. Mounted on the Y axis is the ram type milling head – ram having 1000 mm stroke, sliding through combination of male, case hardened guideway strips and female turcite lining. The main, BT-50 spindle is powered by 18 kW spindle motor and has rotary encoder feedback system. The vertical feed of the ram is through 48 Nm servo motor with brake, in combination with timer belt-pulley & Ø 63 mm ball screw-box nut arrangement. The spindle can accommodating Ø250 mm cutter and is capable of speed up to 2500 RPM. Automatic arbor clamping and de-clamping is through Belleville spring stacks and hydraulic cylinder. The feedback system is through linear scale and counter balancing is through hydraulic. CNC controller is Siemens-Sinumerik 828D and the servo motors are Sinamic IFK7. Spindle servo motor is IPM8 series and the drive for spindle and axes is S120 series. The machine is aesthetically designed and is having sliding door and modular type guard of an average height of 2 metres from the ground. The guard will also have transparent acrylic sheet for ease of viewing the machine and job. MPG, 3 tier lamp, guideway protection, optionally offered chip conveyor system, centralized, automatic lubrication system, multi-layered feed end limit switch mechanism, wipers for slides, optionally offered forced coolant thru for facilitating deep hole drilling, U drilling, etc., are the other features.

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