Planning machine ( Planner): Types of planner, Size and specification of planner, Operation performed on planning machine, Difference between planner and shaper

Planning
machine ( Planner):
  • Planer or planing
    machine is a machine tool, which like the shaper produces flat surfaces in
    horizontal, vertical or inclined plane.  
  • Fundamental difference
    is that the planer operates with an action opposite to that of the shapers,
    i.e., the work piece reciprocates past one or mare stationary single point
    cutting tools.
  •  Planners are meant for machining large sized
    work pieces, which  cannot be machined by
    the shaping machines.
  • The size of planner and
    shaper are specified by the maximum length of stroke.





The photographic view  typically shows the general configuration of
planing machine. Like shaping machines, planing machines are also basically
used for producing flat surfaces in different planes. However, the major
differences between planing machines from shaping machines are :
  •  Though in principle
    both shaping and planing machines produce flat surface in the same way by the
    combined actions of the Generatrix and Directrix but in planing machine,
    instead of the tool, the work piece reciprocates giving the fast cutting motion
    and instead of the job, the tool is given the slow feed motion.
  •  Compared to shaping
    machines, planing machines are much larger and more rugged and generally used
    for large jobs with longer stroke length and heavy cuts. In planing machine,
    the work piece is mounted on the reciprocating table and the tool is mounted on
    the horizontal rail which, again, can move vertically up and down along the
    vertical rails.
  • o Planing machines are
    more productive (than shaping machines) for longer and faster stroke, heavy
    cuts (high feed and depth of cut) possible and simultaneous use of a number of
    tools.

 As in shaping machines, in planing machines
also;
  •  The length and
    position of stroke can be adjusted
  •  Only single point
    tools are used
  •  The quick return
    persists
  •  Form tools are often
    used for machining grooves of curved section
  •  Both shaping and
    planing machines can also produce large curved surfaces by using suitable
    attachments.

Types
of planner:
  • Double housing planer
  • Open side
    planer
  • Pit planer
  • Edge planer
  • Divided head
    planer

Size
and specification of planner
·      Distance between two columns
·       Stroke length of the planer
·     Radial distance between the top of the table
and the bottom most position of the cross rail
·      Maximum length of the table
·     Power of the motor
·    Range of speeds and feed available
·    Types of drives required

Operation
performed on planning machine
  1.              Planning horizontal surface
  2.             Planning
    of an angle
  3.              Planning
    vertical surface
  4.           Planning
    curved surface
Difference between
planner and shaper


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