PRESENTED BY:SHASHANK UPADHYAYMECHANICAL ENGINEERING(AUTO)03
SEMESTER RIT RUDRAPUR
Milling Machines & Operation
WHAT IS MILLING Milling is the machining process of using rotary
cutters to remove material from a work piece advancing (or feeding)
in a direction at an angle with the axis of the tool. It covers a
wide variety of different operations and machines on the scale from
small individual parts to large , heavy_ gang milling operation .
It is one of the most commonly used processes in industry and
machine shops today for machining parts to precise sizes and
shapes.
PRINCIPLE OF MILLING MACHINEMilling operation on the principle
of rotary motion . A milling cutter is spun about an axis while a
work piece is advanced through it in such a way that the blades of
the cutter are able to save chips of material with each pass.
Variety of OperationsFace millingEnd millingKeyway
cuttingDovetail cuttingT-slot and circular slot cuttingGear
cuttingDrillingBoringJob boring
HORIZONTAL MILLING MACHINEHorizontal milling machine.1:base
2:column 3:knee 4&5: table (x axis slide is integral) 6: over
arm 7:arbor (attached to spindle)A horizontal mill has the same
sort of x-y table But the cutters are mounted on a horizontal arbor
across the table . Many Horizontal mills also feature a built in
rotary table that allwos milling at various angle; this feature is
called a universal table.
VERTICAL MILLING MACHINE Vertical milling machine 1:milling
cutter 2:spindle 3:top slide 7:knee 8:base In vertical mill the
spindle axis is a vertically oriented . Milling cutters are held in
the spindle and rotate on its axis .The spindle can generally be
extended . There are toe subcategories of vertical mills: the bed
mill and the turret mill.
COMARISON The choice between vertical and horizontal spindle
orientation in milling machine design usually hinges on the shape
and size of a work piece and the the number of the sides of the
work piece that require machining . Work in which the spindles
axial moment is normal to one plane , with an end mill .
