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Questions and Answers
What is the value of machining speed (S) when it is calculated as $166 imes 0.25$?
What is the value of machining speed (S) when it is calculated as $166 imes 0.25$?
- 41.5 mm/min (correct)
- 50 mm/min
- 62 mm/min
- 166 mm/min
In face turning, what is the assumed value for the step depth (a)?
In face turning, what is the assumed value for the step depth (a)?
- 3 mm
- 4 mm
- 1 mm
- 2 mm (correct)
To calculate machining time for face turning a workpiece with a diameter of 60 mm, what value is required for cutting speed (V)?
To calculate machining time for face turning a workpiece with a diameter of 60 mm, what value is required for cutting speed (V)?
- 50 m/min (correct)
- 70 m/min
- 40 m/min
- 60 m/min
What is the feed per revolution (S) used in the face turning example?
What is the feed per revolution (S) used in the face turning example?
In plain milling, how many teeth does the milling cutter described have?
In plain milling, how many teeth does the milling cutter described have?
What is the diameter of the milling cutter used for plain milling as per the example?
What is the diameter of the milling cutter used for plain milling as per the example?
What is the feed per tooth (Sz) specified for the plain milling operation?
What is the feed per tooth (Sz) specified for the plain milling operation?
What is the total length (L) formula for drilling operation given in the example?
What is the total length (L) formula for drilling operation given in the example?
Which type of cutter is most commonly used for milling plain or flat surfaces?
Which type of cutter is most commonly used for milling plain or flat surfaces?
What is the depth (h) specified for milling the steel block in the example?
What is the depth (h) specified for milling the steel block in the example?
What is the definition of cutting speed in relation to a machining operation?
What is the definition of cutting speed in relation to a machining operation?
Which formula correctly represents rotational cutting speed?
Which formula correctly represents rotational cutting speed?
What does the feed rate refer to in machining?
What does the feed rate refer to in machining?
In the context of cutting conditions, what does auxiliary motion refer to?
In the context of cutting conditions, what does auxiliary motion refer to?
What is meant by the term 'quick return mechanism' in machining?
What is meant by the term 'quick return mechanism' in machining?
What is feed defined as in machining?
What is feed defined as in machining?
How is cutting speed measured?
How is cutting speed measured?
What does the cutting stroke angle (α) measure in shaping operations?
What does the cutting stroke angle (α) measure in shaping operations?
Which of the following correctly describes the term 'depth of cut' in machining?
Which of the following correctly describes the term 'depth of cut' in machining?
What is the relationship between cutting speed and RPM when calculating cutting speed for rotational motion?
What is the relationship between cutting speed and RPM when calculating cutting speed for rotational motion?
What does the variable S represent in the context of cutting conditions?
What does the variable S represent in the context of cutting conditions?
How is the feed rate (S") calculated?
How is the feed rate (S") calculated?
What is the depth of cut denoted as 'a'?
What is the depth of cut denoted as 'a'?
Which of the following factors does NOT govern machining time?
Which of the following factors does NOT govern machining time?
In a turning operation, how is the total travel distance 'L' calculated given lb = la = 5 mm and lw = 100 mm?
In a turning operation, how is the total travel distance 'L' calculated given lb = la = 5 mm and lw = 100 mm?
What does the variable v represent in the context of machining?
What does the variable v represent in the context of machining?
When calculating machining time for turning operations, the number of cutting passes 'i' must be:
When calculating machining time for turning operations, the number of cutting passes 'i' must be:
In the example provided, what is the total depth of cut 'h' when reducing the diameter from 120 mm to 110 mm?
In the example provided, what is the total depth of cut 'h' when reducing the diameter from 120 mm to 110 mm?
If the cutting speed is defined as 60 m/min and the workpiece diameter is 120 mm, what formula relates these parameters in the context of turning?
If the cutting speed is defined as 60 m/min and the workpiece diameter is 120 mm, what formula relates these parameters in the context of turning?
Flashcards
Cutting conditions
Cutting conditions
Numerical values defining the parameters of a machining operation.
Cutting Speed (V)
Cutting Speed (V)
The speed at which the cutting tool moves relative to the workpiece surface in one minute.
Feed (S)
Feed (S)
The distance the cutting tool moves in one revolution of the workpiece.
Feed rate (S")
Feed rate (S")
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Depth of Cut
Depth of Cut
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Rotational Speed (n)
Rotational Speed (n)
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Cutting Stroke Length (L)
Cutting Stroke Length (L)
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Cut to Return Ratio (K)
Cut to Return Ratio (K)
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Cutting Stroke Angle (α)
Cutting Stroke Angle (α)
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Return Stroke Angle (β)
Return Stroke Angle (β)
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Machining Time (Tm)
Machining Time (Tm)
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Plain Milling Cutter
Plain Milling Cutter
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Number of Teeth (Z)
Number of Teeth (Z)
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Depth of Cut (a)
Depth of Cut (a)
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Tool travel distance (L)
Tool travel distance (L)
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Number of cutting passes (i)
Number of cutting passes (i)
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Machining allowance (h)
Machining allowance (h)
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Depth of cut per pass (a)
Depth of cut per pass (a)
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Average cutting speed (V)
Average cutting speed (V)
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Machined diameter (d)
Machined diameter (d)
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Workpiece diameter (D)
Workpiece diameter (D)
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Average diameter (Dm)
Average diameter (Dm)
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Study Notes
Production Technology: Cutting and Machining Time
- Cutting conditions are the numerical values selected before starting a machining operation
- Cutting speed (V) is the number of feet or meters of workpiece surface passing a tool in one minute
- Measured in m/min
- Rotational: used for milling, turning, and drilling
- Linear: used for shaping
- Rotational cutting speed formula: V = πDn/1000
- D: diameter in mm
- n: RPM (revolutions per minute)
- Linear cutting speed formula: V = Ln(1+K)/1000
- L: cutting stroke length (mm)
- n: rotational speed (r.p.m)
- K: cut to return ratio (α/β=2)
Feed and Feed Rate
- Feed is the movement of the tool cutting edge parallel to the machined surface (mm/rev)
- Feed rate is the rate of feed per unit time (mm/min)
- Feed per tooth (S_z): used for milling and drilling (mm/tooth)
- Feed rate (S'): S' = n x S (mm/min)
- Feed (S): in mm/rev
Depth of Cut
- Depth of cut (a): distance between the machined and work surface, measured perpendicular to the feed direction
- Measured in mm
Machining Time Definition
- Machining time is the time a machine takes to work on a component, from tool contact to tool separation
- Factors governing machining time: length of cut, feed, depth of cut, and cutting speed
Turning Operation
- Turning operation (machining time): Tm = L/(S' * i)
- L: tool travel distance in feed direction (mm)
- S': feed rate (mm/min)
- i: number of cutting passes
- Longitudinal turning: L = la + lw + lb
Face Turning
- Face turning formula: Tm = L / (S' x i)
- L = D/2 + La
- D: diameter (mm)
- La: approach distance
- assume a = 2 mm
Milling Operation
- Plain milling: involves a cylindrical cutter with teeth on the periphery
- Tm= L / (S' x i)
- L: la+lw+lb
Drilling Operation
- Drilling involves creating holes using a twist drill
- Tm: drilling time: Tm = L / (S' x i) - L: distance to drill, la + lw + lb - S': feed rate, n x S - i: number of passes
- Two hole types: through-hole and blind hole
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