MILLING MACHINE
Introduction: Milling is the cutting operation that removes metal by feeding the work against a rotating, cutter having single or multiple cutting edges. Flat or curved surfaces of many shapes can be machined by milling with good finish and accuracy. A milling machine may also be used for drilling, slotting, making a circular profile and gear cutting by having suitable attachments.
Working Principle: The workpiece is holding on the worktable of the machine. The table movement controls the feed of workpiece against the rotating cutter. The cutter is mounted on a spindle or arbor and revolves at high speed. Except for rotation the cutter has no other motion. As the workpiece advances, the cutter teeth remove the metal from the surface of workpiece and the desired shape is produced.
Horizontal Milling Machine Construction: The main part of machine is base, Column, Knee, Saddle, Table, Overarm, Arbor Support and Elevating Screw.
1. Base: It gives support and rigidity to the machine and also acts as a reservoir for the cutting fluids.
2. Column: The column is the main supporting frame mounted vertically on the base. The column is box shaped, heavily ribbed inside and houses all the driving mechanisms for the spindle and table feed.
3. Knee: The knee is a rigid casting mounted on the front face of the column. The knee moves vertically along the guide ways and this movement enables to adjust the distance between the cutter and the job mounted on the table. The adjustment is obtained manually or automatically by operating the elevating screw provided below the knee.
4. Saddle: The saddle rests on the knee and constitutes the intermediate part between the knee and the table. The saddle moves transversely, i.e., crosswise (in or out) on guide ways provided on the knee.
5. Table: The table rests on guide ways in the saddle and provides support to the work. The table is made of cast iron, its top surface is accurately machined and carriers T-slots which accommodate the clamping bolt for fixing the work. The worktable and hence the job fitted on it is given motions in three directions:
a). Vertical (up and down) movement provided by raising or lowering the knee.
b). Cross (in or out) or transverse motion provided by moving the saddle in relation to knee.
c). Longitudinal (back and forth) motion provided by hand wheel fitted on the side of feed screw.
In addition to the above motions, the table of a universal milling machine can be swiveled 45° to either side of the centre line and thus fed at an angle to the spindle.
6. Overarm: The Overarm is mounted at the top of the column and is guided in perfect alignment by the machined surfaces. The Overarm is the support for the arbor.
7. Arbor support: The arbor support is fitted to the Overarm and can be clamped at any location on the Overarm. Its function is to align and support various arbors. The arbor is a machined shaft that holds and drives the cutters.
8. Elevating screw: The upward and downward movement to the knee and the table is given by the elevating screw that is operated by hand or an automatic feed.
MILLING OPERATIONS
2. Face Milling
5. Form Milling
6. Gang Milling
35 Responses to “Principle and Working of MILLING MACHINE”
arunkumar
horizontal milling machine.
arunkumar
@arunkumar
sachin
good for engg. student
gopichand
hi this is gopichand please send milling machine working manul to my email id
yogie
thanx guys sufficiant explanation fr an engineering corse…
Lakshman
Superb..
kartheek
please send principle of vmc
Chetan bhogal
Sir plz send sure short details of thermal dynamics
admin
Thanks for the Comment.
Right now Thermodynamics notes are not fully available. We will try to put it ASAP.
vijay kumar
hi all of plz send hydrauli cs manual to my email id
vikas kumar pandey
thanks for these details
admin
Thanks for the comment
Aftab
please send the detail of application of milling machine and verious types of milling machine
thank you
Anyewi George
manufacturing engineeriny machine.
Mr.Aarif faridi
Thanks………!
mool chandra
sand to grinder working principal and detail
katmande pravin
very important for engineearing student
admin
Thanks
M.Sivaji
Sir plz sent short notes on hydraulic machinery
khamsull khassan
Please my you guys send me the difference btn horizontal milling and vertical milling machine .thank you
RAMESH CHAND
Please Send me dividing formulas like divide no. of holes,Divide gear teeth’s
Olajide
I like it
Ashish Gope
Please Send me dividing formulas like divide no. of holes,Divide gear teeth’s
Parisara agnihotri
Plz send me contructional features of horizobtal and vertical milling machine plz its urgenr
Rakesh mandal
Sir plz send short notes all mill
Millie Hue
A friend of mine is going to buy a milling machine. He told me yesterday when we went out for a coffee. He said that he needed a couple of those machines for work-related purposes. I have limited knowledge about it, so I thought I would look it up today. It appears that the cutter has no other motion other than rotating, and it also removes the metal and forms the desired shape. Thanks for the information!
ramakrishnan
Great post. The information given in this article is very useful. Thanks for sharing it. Keep sharing such articles.
Vijay Kumar
Please send me the notes of the whole subject of production technology
Thank you
Shreekesh Kumar
Thanks for providing this helpful notes
ALASKE USMAN
Thanks for your help,really it help students studying mechanical and metal technology
Hassan Saidi
Those who nées help on dividing formula May contact me on above email address.Charges May incurr
Dean Phillips
I had no idea that a milling machine has a base that gives it support and rigidity. My brother works in an industrial warehouse that specializes in manufacturing equipment for pharmaceutical and construction companies. It might be beneficial for them to work with a company that has a milling machine to help them with any future projects.
Vivek Reddy
Study of manufacturing of column of Plano milling machine
please send this document to mail sir it is so urgent
chirra tharun
good….!
syed altaf ahamad
please send lab manual