Shaper Mechanism

Introduction Shaping is a material removal process in

which a cutting tool takes mass and shapes a stationary object to produce a sculpted or plane surface and a shaping machine is used to machine surfaces. It can cut curves, angles and many other shapes.

Types of shaper mechanism . A shaping machine may use:  1. Whitworth quick return mechanism  2. Crank and slotted link mechanism

3. Hydraulic shaper mechanism

Links & joints

Fig- link & joint position

Calculation of degree of freedom Links(n)-1,2,3,4,5 Total-5,

1 degree of freedom joints-A,B,C,D,E J1 =5 , 2 degree of freedom joints-p J2=1 , Degree of freedom of system=3*(n-1)-2* J1 -

J2

=3*4-2*5-1 =1

Mechanism how works

Purpose and Role of mechanism

rotary movement of the drive is converted into reciprocating movement contained within the column of the machine.

QUICK RETURN MECHANISM. Why name is quick return

mechanism??????

The parts shown in the above figure are officially labeled as:

1. Driving pinion 2. Crank pin 3. Sliding block 4. Crank plate 5. Pivot for crank plate 6. Connecting rod

7. Connecting pin for ram 8. Ram 9. Pin A. Fixed pin

Advantages of this method…  1:function simple so manufacturing cost is less,   2:less costly than lathe or milling machine,   Disadvantages of method:   1:circular objects can not be finished;   2:-cutting only half of time ,

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