Instructional objectives
At the end of this lesson, the students will be able to;
(i) State the principles and conditional requirements of mounting jobs and tools in
machine tools
(ii) Illustrate how the jobs (blanks) and cutting tools are mounted in
a. Lathes
b. Drilling machines
c. Shaping, Planing and slotting machines
d. Milling machine
e. Grinding machines
(iii) Point out the special requirements and methods on mounting job and cutting
tools in CNC machine tools.
(i) Principles And Conditional Requirements Of Mounting
Job And Cutting Tool In Machine Tools
The job or blank and the cutting tools essentially need to be properly mounted in
the machine tool for achieving desired performance of the machining system.
The following principles are generally followed and conditions are maintained;
(a) while mounting the job or blank in the machine tool
• appropriate selection of work holding device or system from the
available resources depending upon;
Δ configuration of the machine tool
Δ shape, size and weight of the blank
Δ kind of machining work to be done
Δ order of dimensional accuracy desired
Δ volume (number of same job) of production
• correct location, strong support and rigid clamping of the blank against
the cutting and other forces
• easy and quick loading and unloading to and from the machine tool or
the holding device
• proper alignment like coaxiality, concentricity etc. of rotating jobs
• free flow of chips and cutting fluid
(b) while mounting the cutting tools
• appropriate selection of tool holder and the method of mounting
• proper positioning and orientation of the tool depending upon its
Δ type
Δ size and shape
Δ geometry
• proper alignment in respect of coaxiality, concentricity and machine tool
configuration
• accurate and quick locating, strong support and rigid clamping
• minimisation of run out and deflection during cutting operation