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PROJECT MEMBERS J.VIJAY KARTHICK - 09

B.VENKATAKRISHNAN - 04

S.VIGNESHWARAN - 08

R.VEERAPATHRAN - 02

SUPERVISOR

Mr .S.VISHNU KARTHIK

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PLANING OF WOOD

USING SCOTCH YOKE

MECHANISM

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SCOTCH YOKE MECHANISM

The scotch yoke is a mechanism for converting the linearmotion of a slider into rotational motion or vice-versa

The piston or other reciprocating part is directly coupled toa sliding yoke with a slot that engages a pin on the rotating

part

This mechanism is used to convert the rotary motion into

reciprocating motion

The shape of the motion of the reciprocating part is a puresine wave over time given a constant rotational speed

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LAYOUT

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PLANING Planing is the operation of truing up a piece of wood

by a planer.This is known as facing and edging

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WORKING The rotating part is connected with the motor. When the

motor starts run the rotating part start to rotate. One ballis attached with the rotating part

The ball is used to reciprocate the reciprocating part withrespect to the rotation of circular disc(rotating part)

The planing tool is fixed with the end of the reciprocating

part and the movement of reciprocating part is use to planthe wood surface

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DESIGN CALCULATIONVelocity of Reciprocating part =(Distance/Time)

= (200/15)

= 13 mm/sec

Material Removal Rate (MRR) =v * f* d

v=velocity of tool=velocity of reciprocating part

f=feed

d=depth of cut

MRR=13*15*5=975 mm^3/sec

Required power = k * MRR

k=constant based on hardness of wood

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DESIGN CALCULATION Power = 1 * 975 * 10^-6 HP = 0.727 watt For Rotating part,

Power =2NT/60 0.727=2*2*T/60 Torque(T)=3.47 Nm =) Force * Distance =3.47 Nm m*a*r=3.47

m=mass of circular disc a=acceleration=r*^2 r=radius 0f circular disc=0.15 m =720/60=12 rad/sec

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DESIGN CALCULATION m*0.15*12^2 =3.47

m=1.07 kg 2 kg

Reciprocating part, l=length=50 cm

Diameter of ball= 10 cm

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ADVANDAGES Fewer moving parts

Smooth operation

Reduce the man power Using this mechanism can do different machining

process in each side