A Planing Machine produces flat surfaces The Table holding the Work

A planing machine produces flat surfaces the table

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A Planing Machine produces flat surfacesThe Table holding the Work reciprocatesThere should be some mechanism to move the Table in reciprocating motion, andTable to move quick during idle stroke167
1. Open & Cross belt drive2. Reversible motor drive3. Hydraulic drive168
Loose PulleyFast PulleyPulleys on ShaftOpen beltCounter ShaftCross beltBeltshifter9,12 Loose Pulleys10,11 Fast PulleysRack19 - Table18. Trip dog17. Belt shifter lever13 - Bull gear shaft14 - Bull gearChange gearsFeed disc169
Used for smaller capacity machinesTable is moved by gears & rack attached under the tableCounter shaft at the top of housing has 2 pulleysThese Pulleys transfer power to main shaft(Driving)Main shaft drives the table by rack & pinion170
2 Sets of fast & loose pulleys are mounted on driving shaft at one end and pinion is on another endRETURN STROKE:Smaller fast pulley is used for backward motion of table(Quick motion)It is connected by open belt driveThe open belt passes over small fast pulley to get QuickreturnThe Cross belt is on loose pulley so it will not drive171
FORWARD STROKE:Bigger fast pulley is driven by cross belt driveIt is used to drive the table during cutting strokeOpen belt is on loose pulleyAt the end of cutting stroke, cross belt is shifted from fastpulley to loose pulleySimultaneously open belt is shifted from loose pulley to fast pulleyThis is achieved by trip dog which operates belt shifting leverThus the direction of movement is automatically reversed172
173
Electric motor drives the bull gear through gear trains174Motor is coupled to D.C. generatorWhen motor is started, generator supplies powerto reversible motor
Reversible motor causes the planer table to moveAt the end of stroke, trip dog operates the switch which reverses the direction of tableSpeed of cutting stroke is reduced by regulating the field current of the generator175
A.C.driving motorE citer176GeneratorReversible motorMotor fieldresistanceMotor fieldGenerator fieldReversing switch
TABLE177Operating CylinderSpeed Control
During cutting stroke,oil is pumped into LHSof cylinderAs the area is less due to presence of piston rod, less force actsSo the table movesslowly in cutting strokeAt the end of each stroke trip dog operates a leverLever actuates theTABLE178
Oil is pumped into theOperating cylinderCylinder contains piston & piston rodThe other end of piston rod is connected to the TableDuring return stroke, oil is pumped into RHS of cylinderMore force acts on the piston & it moves quicklyTABLE179
Flow of oil is changed from one side to the other side of cylinder180The length of stroke can be varied by adjusting the distance between trip dogs
1.Planing Horizontal Surfaces2.Planing Vertical Surfaces3.Planing Angular Surfaces / Dovetails4.

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