Milling Machine

General Engineering (Manufacturing)

Milling Machine is, a device that rotates a circular tool that has a number of cutting edges symmetrically arranged about its axis; the workpiece is commonly held in a vise or similar device clamped to a table that can move in three perpendicular directions.

A horizontal machining center employs a spindle that is parallel to the ground floor. With a horizontally oriented spindle, tools stick out of the side of the tool holder and cut across the side of a work-piece, encouraging chips to fall away from the table. These are used to create features like key way, slots, fillets chamfers, gear and other profiles.

A horizontal milling machine

Technical specifications:

Configuration of a typical horizontal milling machine

Max load table (kg)

1500 

Longitudinal travel 

1530/1520 mm (Manual/Auto)

Transverse travel

360/345 mm (Manual/Auto)

Vertical travel

630/610 mm (Manual/Auto)

Cutting feed speed (mm/min)

X/ Y: 16-1800 Z: 5-250 

Rapid feed speed (mm/min)

X/Y: 3000 Z: 1000 

Spindle speed range (RPM)

45-1800 

Spindle speed step

17

Distance between spindle nose and table surface (mm)

10-640 

Spindle motor power (Kw)

15 kW

Overall dimension (mm)

2250× 3200× 2100

Machine weight (Kg)

4600 

Table size (mm)

2000× 500

Number width distance of T Slot (mm)

5-18-80 

Vertical milling, also known as vertical machining, removes metal from a workpiece using rotary cutters. A vertical machining centre (VMC) uses a vertically oriented spindle to do vertical machining. Tools stick straight down from the tool holder when using a vertically oriented spindle, and frequently cut across the top of a workpiece.

A vertical milling center

Technical specifications:

Configuration of a vertical milling center

Working surface (mm)

1300×300 

Main motor (HP)

Feed motor (HP)

Arbor diameter (mm)

25.4 

Center distance between T slot

70

Longitudinal travel X

700

No of feeds

12

Vertical feed/min

3-70

Rapid vertical min

175

Table

Working surface

1400×330

Center distance between T-slot

80

Longitudinal travel – X

800

Cross travel – Y

260

Vertical travel – Z

510

Feeds

No. of feeds

12

Long. feed/min

23 – 420

Vert. feed/min

3 – 70

Rapid long cross/min

1050

Rapid vertical/min

175

Spindle

Speed (RPM)

40 to 1200 (12)

Spindle taper

ISO 40

Arbor diameter (mm)

25.4

Main motor (HP)

Feed motor (HP)

The milling operation utilizes a rotating cutter as a cutting tool to produce prismatic parts, contrary to only axisymmetric parts in turning operation. Similar to the CNC turning machines, the CNC milling machines rely on the G-and M-code for motion control and tool feeding. A 2-D and 3-D CAD model can be directly imported to the CNC milling machines, which subsequently converts the drawing or CAD model into G-and M- codes and performs complex machining operations.

A CNC milling machine

Technical specifications:

Configurations of a CNC milling machine

Models

XK7124 / XK7124A

X axis travel (mm)

430 (Optional : 530)

Y axis travel (mm)

280

Z axis travel (mm)

400

Distance spindle nose to table surface (mm)

60-460

Distance center of spindle to column (mm)

297

T Slot (width in mm × qty in numbers × spaces in mm)

16 × 3× 60

Size of worktable (L × W) in mm

800 × 240 (Optional: 900 × 240)

Max. loading of worktable (Kg)

60

Power of spindle motor (Kw)

1.5 (Frequency Inverter)

Spindle taper

BT 30

Spindle speed (RPM)

4000

Tool clamping Way

Manually / Pneumatically

Positioning accuracy (mm)

0.04

Repeatability accuracy (mm)

0.02

Feeding speed (mm/min)

0 – 2000

Rapid feeding speed: X – Y – Z Axis (m/min)

6

Feeding motor power: X Axis in Kw

1 / 1 / 1

Min. set unit (mm)

0.001

Max. size of tool (mm)

∅ 60× 175

Max. loading weight of tool (kg)

3.5

Max. weight (include machine stand) (kg)

900

Size of packing (L× W× H) in mm

1900× 1620× 2280