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### cutting speed

1. 1. CUTTING SPEED Introduction I M P O R TAN T O F C U T T I N G S P E E D  C O R R E C T V S A V E T I M E & C O S T.  C O N T R I B U T E TO Q U A L I T Y & S U R FA C E F I N I S H .
2. 2. CUTTING SPEED - KEEP THE CUTTING TOOL LAST LONGER ( W I T H O U T S H A R P E N I N G R E P E AT E D LY ) . - MAXIMIZE THE MACHINING PROCESS WITHOUT DAMAGING THE TOOL, WP & MACHINE.
3. 3. CUTTING SPEED Basic factor in Turning THE FACTORS: V = CUTTING SPEED IN METRE PER MINUTE [M/MIN] N = SPEED OF WORK (SPINDLE SPEED) IN REVOLUTION PER MINUTE [REV/MIN] D Π = DIAMETER OF THE WP IN MILLIMETRE [MM] = C O N S TA N T 3 . 1 4 2 R E L AT I O N B E T W E E N T H E FA C T O R S :
4. 4. CUTTING SPEED Spindle speed diagram / rpm graph
5. 5. CUTTING SPEED Spindle speed diagram / rpm graph EXAMPLE : GIVEN V = 25 M/MIN D = 100 MM Π N = C O N S TA N T 3 . 1 4 2 = ? Solution: N = = = = 1000 X V dXπ 1000 X 25 100 X 3.142 25000 3.142 79.6 rev/min
6. 6. CUTTING SPEED THE FACTORS : -DIAMETER TO BE WORK. - D E P T H O F C U T. -FEED. -TYPE OF WORK. - T Y P E O F T O O L M AT E R I A L .
7. 7. CUTTING SPEED  D E P T H O F C U T.  F E E D R AT E .
8. 8. CUTTING SPEED Machining Time D0 = Original / initial diameter [mm] l = Length of tool travelled D1 = New / final diameter [mm] F = Feed [mm/rev] d = Depth of cut [mm] Fr = Feed rate [m/min] N = Spindle speed [rev/min] V = Cutting speed [m/min] L = Length of the workpiece T = Time taken by the tool [min]
9. 9. CUTTING SPEED Machining Time The turning operation reduces the diameter of the workpiece from D0 to the final diameter D1. The Change in diameter is determined by the depth of cut, d: D0 - D1 = d [mm] The feed in turning can be converted to a linear travel rate in mm/min by the formula: Fr = N · F [mm/min] The time to machine from one end to required length is given by: T = l / Fr [min]