column and knee type milling
TRANSCRIPT
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1. Column and knee type
2. Manufacturing or Fixed bed type
3.
Planer type4. Special purpose type
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a. Hand milling machine
b. Horizontal milling machine
c.
Vertical milling machined. Universal milling machine
e. Omniversal milling machine
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a. Simplex type
b. Duplex type
c.
Triplex type
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a. Rotary table milling
b. Drum milling
c.
Profiling millingd. Tracer controlled milling
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It is simplest and small insize
All operation are
performed by hand exceptthe rotation of arbor
It is used for producingsmall components likehexagonal heads on bolts,cutting slots on screwheads ,cutting key ways
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It is horizontal milling, becausethe position of cutter spindle ishorizontal
In this machine vertical column
serves as a housing forelectricals, spindle bearings etc
Knee projects from column andit supports to saddle,table
Table can give three motions
i. Longitudinal motionii. Transverse motion
iii. Vertical motion
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It derives its name from thevertical position of cutterspindle
The overarm in this machine ismade integral with column andcarries a fixed head
Table movements arehorizontal, transverse and
vertical We can perform drilling, facing
and boring
Generally it is used for endmilling and face milling
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After lathe it is the most usefulmachine tool and it is capable ofperforming most machineoperations
It is similar to the horizontalmilling machine
The difference is table placed onthe swivel plate
By that we can give one moreadditional movement to thesaddle in horizontal plane
It is used for helical gears andspiral flutes and grooves
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It is modified form of plainmilling machine and isprovided with two spindles
One is horizontal like plainmilling, another is carried by a
universal swivelling head This is fixed in vertical position It carries two more adjustments
in addition to all the possiblemotions in universal millingmachine
Special features that variousoperations are carried out indifferent planes and at differentangles in without disturbingthe work
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It differs from the column and knee typemilling that here table is mounted on a fixedbed instead of saddle and knee
It has only one spindle in horizontal position
It gives longitudinal motion to spindle andcolumn will move in vertical direction
This is used for mass production by using withcarbide cutters and requires huge power
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It has two spindles fixedon both sides of table
This machines are less
flexible the column andknee type ,becauseautomatic feed is essential
Table will withstand longtime for heavy loads
It is used for largeproduction
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Actually it is planeradopted for doingmilling
In planer variable tablefeeding movements but
here the rotating cutter
Transverse and verticalmovements areprovided
It is used for milling onvery big jobs
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This machine haverotary feeding circulartable
I
t consists of twovertical spindles eachequipped with afacing mill
This machine is fast
on operation but islimited to milling ofthe flat surfaces
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This machine has avertical central drumwhich rotates on ahorizontal axis
For end facing ,these aretwice as productive asrotary mills
In operation drumrotates slowly carry thework against therotating cutters
Automobile cylinderheads and small shaftsare milled
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In appearance it isvertical spindlemachine
It has one to fourcutter spindles
We can performoperation in two
dimensions
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This machine is best forproducing verycomplicated parts
It has copying
capabilities throughtracer control
On this machine we canperform job in moredirections
We can producecomplex shapes likecams , dies, molds etc