Recent questions tagged machining-and-machine-tools-operations / GO Mechanical

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GATE2020-ME-1: 12
The base of a brass bracket needs rough grinding. For this purpose, the most suitable grinding wheel grade specification is $C30Q12V$ $A50G8V$ $C90J4B$ $A30D12V$

The base of a brass bracket needs rough grinding. For this purpose, the most suitable grinding wheel grade specification is$C30Q12V$$A50G8V$$C90J4B$$A30D12V$

go_editor

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go_editor asked Feb 19, 2020

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GATE2019 ME-2: 25
In an electrical discharge machining process, the breakdown voltage across inter electrode gap (IEG) is $200$ V and the capacitance of the RC circuit is $50 \mu F$. The energy (in $J$) released per spark across the IEG is _________

In an electrical discharge machining process, the breakdown voltage across inter electrode gap (IEG) is $200$ V and the capacitance of the RC circuit is $50 \mu F$. The e...

Arjun

28.5k points

Arjun asked Feb 9, 2019

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GATE2019 ME-2: 53
A through hole is drilled in an aluminium alloy plate of $15 \: mm$ thickness with a drill bit of diameter $10$ mm, at a feed of $0.25$ mm/rev and a spindle speed of $1200$ rpm. If the specific energy required for cutting this material is $0.7 \: N \cdot m/mm^3$, the power required for drilling is ____________$W$ (round off to two decimal places)

A through hole is drilled in an aluminium alloy plate of $15 \: mm$ thickness with a drill bit of diameter $10$ mm, at a feed of $0.25$ mm/rev and a spindle speed of $120...

Arjun

28.5k points

Arjun asked Feb 9, 2019

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GATE2019 ME-1: 35
In orthogonal turning of a cylindrical tube of wall thickness $5 \: mm$, the axial and the tangential cutting forces were measured as $1259 \: N$ and $1601 \:N$, respectively. The measured chip thickness after machining was found to be $0.3 \: mm$. The rake angle was ... solution, the shear strength of the material is closest to $722 \: MPa$ $920 \: MPa$ $200 \: MPa$ $875 \: MPa$

In orthogonal turning of a cylindrical tube of wall thickness $5 \: mm$, the axial and the tangential cutting forces were measured as $1259 \: N$ and $1601 \:N$, respecti...

Arjun

28.5k points

Arjun asked Feb 9, 2019

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GATE2019 ME-1: 36
A circular shaft having diameter $65.00_{-0.05}^{+0.01} \: mm$ is manufactured by turning process. A $50 \: \mu m$ thick coating of TiN is deposited on the shaft. Allowed variation in TiN film thickness is $\pm 5 \mu m$. The minimum hole diameter (in mm) to just provide clearance fit is $65.01$ $65.12$ $64.95$ $65.10$

A circular shaft having diameter $65.00_{-0.05}^{+0.01} \: mm$ is manufactured by turning process. A $50 \: \mu m$ thick coating of TiN is deposited on the shaft. Allowed...

Arjun

28.5k points

Arjun asked Feb 9, 2019

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GATE2019 ME-1: 52
In ASA system, the side cutting and end cutting edge angles of a sharp turning tool are $45^{\circ}$ and $10^{\circ}$, respectively. The feed during cylindrical turning is $0.1 \: mm/rev$. The center line average surface roughness (in $\mu m$, round off to one decimal place) of the generated surface is __________

In ASA system, the side cutting and end cutting edge angles of a sharp turning tool are $45^{\circ}$ and $10^{\circ}$, respectively. The feed during cylindrical turning i...

Arjun

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Arjun asked Feb 9, 2019

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GATE2019 ME-1: 53
Taylor’s tool life equation is given by $VT^n=C$, where $V$ is in $m/min$ and $T$ is in $min$. In a turning operation, two tools $X$ and $Y$ are used. For tool $X$, $n=0.3$ and $C=60$ and for tool $Y$, $n=0.6$ and $C=90$. Both the tools will have the same tool life for the cutting speed (in $m/min$, round off to one decimal place) of ____________

Taylor’s tool life equation is given by $VT^n=C$, where $V$ is in $m/min$ and $T$ is in $min$. In a turning operation, two tools $X$ and $Y$ are used. For tool $X$, $n=...

Arjun

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Arjun asked Feb 9, 2019

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GATE ME 2012 | Question: 27
Details pertaining to an orthogonal mental cutting process are given below. ... during the process is $0.1781 \times 10^5$ $0.7754 \times 10^5$ $1.0104 \times 10^5$ $4.397 \times 10^5$

Details pertaining to an orthogonal mental cutting process are given below.$\begin{array}{ll} \text{Chip thickness ratio} & 0.4 \\ \text{Undeformed thickness} & 0.6 \text...

Andrijana3306

1.5k points

Andrijana3306 asked Mar 19, 2018

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GATE2018-1-14
A grinding ratio of $200$ implies that the grinding wheel wears $200$ times the volume of the material removed grinding wheel wears $0.005$ times the volume of the material removed aspect ratio of abrasive particles used in the grinding wheel is $200$ ratio of volume of abrasive particle to that of grinding wheel is $200$

A grinding ratio of $200$ implies that thegrinding wheel wears $200$ times the volume of the material removedgrinding wheel wears $0.005$ times the volume of the material...

Arjun

28.5k points

Arjun asked Feb 17, 2018

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GATE2018-1-13
Using the Taylor's tool life equation with exponent $n=0.5$, if th cutting speed is reduced by $50$, the ratio of new tool life to original tool life is $4$ $2$ $1$ $0.5$

Using the Taylor's tool life equation with exponent $n=0.5$, if th cutting speed is reduced by $50$, the ratio of new tool life to original tool life is$4$$2$$1$$0.5$

Arjun

28.5k points

Arjun asked Feb 17, 2018

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GATE2017 ME-2: 55
In an orthogonal machining with a tool of $9^{\circ}$ orthogonal rake angle, the uncut chip thickness is $0.2$ mm. The chip thickness fluctuates between $0.25$ mm and $0.4$ mm. The ratio of the maximum shear angle to the minimum shear angle during machining is ___________.

In an orthogonal machining with a tool of $9^{\circ}$ orthogonal rake angle, the uncut chip thickness is $0.2$ mm. The chip thickness fluctuates between $0.25$ mm and $0....

Arjun

28.5k points

Arjun asked Feb 26, 2017

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GATE2017 ME-2: 54
During the turning of a $20$ mm- diameter steel bar at a spindle speed of $400$ rpm, a tool life of $20$ minute is obtained. When the same bar is turned at $200$ rpm, the tool life becomes $60$ minute. Assume that Taylor's tool life equation is valid. When the bar is turned at $300$ rpm, the tool life (in minute) is approximately. $25$ $32$ $40$ $50$

During the turning of a $20$ mm- diameter steel bar at a spindle speed of $400$ rpm, a tool life of $20$ minute is obtained. When the same bar is turned at $200$ rpm, the...

Arjun

28.5k points

Arjun asked Feb 26, 2017

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GATE2017 ME-1: 55
Two cutting tools with tool life equations given below are being compared: Tool $1$: $VT^{0.1}=150$ Tool $2$: $VT^{0.3}=300$ where $V$ is cutting speed in m/minute and $T$ is tool life in minutes. The breakeven cutting speed beyond which Tool $2$ will have a higher tool life is ________ m/minute.

Two cutting tools with tool life equations given below are being compared:Tool $1$: $VT^{0.1}=150$Tool $2$: $VT^{0.3}=300$where $V$ is cutting speed in m/minute and $T$ i...

Arjun

28.5k points

Arjun asked Feb 26, 2017

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GATE2017 ME-1: 53
A block of length $200$ mm is machined by a slab milling cutter $34$ mm in diameter. The depth of cut and table feed are set at $2$ mm and $18$ mm/minute, respectively. Considering the approach and the over travel of the cutter to be same, the minimum estimated machining time per pass is ________ minutes.

A block of length $200$ mm is machined by a slab milling cutter $34$ mm in diameter. The depth of cut and table feed are set at $2$ mm and $18$ mm/minute, respectively. C...

Arjun

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Arjun asked Feb 26, 2017

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GATE2017 ME-1: 24
Metric thread of $0.8$ mm pitch is to be cut on a lathe. Pitch of the lead screw is $1.5$ mm. If the spindle rotates at $1500$ rpm, the speed of rotation of the lead screw (rpm) will be ________.

Metric thread of $0.8$ mm pitch is to be cut on a lathe. Pitch of the lead screw is $1.5$ mm. If the spindle rotates at $1500$ rpm, the speed of rotation of the lead scre...

Arjun

28.5k points

Arjun asked Feb 26, 2017

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GATE2017 ME-1: 22
Match the processes with their characteristics: ... $P-3, Q-2, R-1, S-4$ $P-3, Q-2, R-4, S-1$ $P-2, Q-4, R-3, S-1$

Match the processes with their characteristics:$\begin{array}{|l|l|l|} \hline & \textbf{Process} & & \textbf{Characteristics} \\ \hline P. & \text{Electrical Discharge Ma...

Arjun

28.5k points

Arjun asked Feb 26, 2017

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GATE2016-3-51
In a single point turning operation with cemented carbide tool and steel work piece, it is found that the Taylor’s exponent is $0.25$. If the cutting speed is reduced by $50 \%$ then the tool life changes by ______ times.

In a single point turning operation with cemented carbide tool and steel work piece, it is found that the Taylor’s exponent is $0.25$. If the cutting speed is reduced b...

Arjun

28.5k points

Arjun asked Feb 24, 2017

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GATE2016-3-49
For an orthogonal cutting operation, tool material is HSS, rake angle is $22^\circ $, chip thickness is $0.8 \: mm$, speed is $48 \: m/min$ and feed is $0.4 \: mm/rev$. The shear plane angle (in degrees) is $19.24$ $29.70$ $56.00$ $68.75$

For an orthogonal cutting operation, tool material is HSS, rake angle is $22^\circ $, chip thickness is $0.8 \: mm$, speed is $48 \: m/min$ and feed is $0.4 \: mm/rev$. T...

Arjun

28.5k points

Arjun asked Feb 24, 2017

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GATE2016-2-51
For a certain job,the cost of metal cutting is $Rs$. $18C/V$ and the cost of tooling is $Rs$. $270C/(TV)$,where $C$ is a constant,$V$ is the cutting speed in $m/min$ and $T$ is the tool life in minutes.The Taylor's tool life equation is $VT^{0.25}$-$150$.The cutting speed (in $m/min$) for the minimum tool cost is

For a certain job,the cost of metal cutting is $Rs$. $18C/V$ and the cost of tooling is $Rs$. $270C/(TV)$,where $C$ is a constant,$V$ is the cutting speed in $m/min$ and ...

Arjun

28.5k points

Arjun asked Feb 24, 2017

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GATE2016-2-24
The following data is applicable for a turning operation. The length of job is $900$ $mm$, diameter of job is $200$ $mm$, feed rate is $0.25$ $mm/rev$ and optimum cutting speed is $300$ $m/min$. The machining time (in $min$) is __________

The following data is applicable for a turning operation. The length of job is $900$ $mm$, diameter of job is $200$ $mm$, feed rate is $0.25$ $mm/rev$ and optimum cutting...

Arjun

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Arjun asked Feb 24, 2017

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GATE2016-1-50
The tool life equation for HSS tool is $VT^{0.14}f^{0.7}d^{0.4}$ = constant. The tool life $(T)$ of $30 \: min$ is obtained using the following cutting conditions: $V=45\:m/min$, $f=0.35 \: mm$, $d=2.0 \: mm$ If speed $(V)$, feed $(f)$ and depth of cut $(d)$ are increased individually by $25\%$, the tool life (in $min$) is $0.15$ $1.06$ $22.50$ $30.0$

The tool life equation for HSS tool is $VT^{0.14}f^{0.7}d^{0.4}$ = constant. The tool life $(T)$ of $30 \: min$ is obtained using the following cutting conditions:$V=45\:...

Arjun

28.5k points

Arjun asked Feb 24, 2017

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GATE2016-1-24
In an orthogonal cutting process the tool used has rake angle of zero degree. The measured cutting force and thrust force are $500 \: N$ and $250 \: N$, respectively. The coefficient of friction between the tool and the chip is _________

In an orthogonal cutting process the tool used has rake angle of zero degree. The measured cutting force and thrust force are $500 \: N$ and $250 \: N$, respectively. The...

Arjun

28.5k points

Arjun asked Feb 24, 2017

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GATE2016-1-23
The non-traditional machining process that essentially requires vacuum is electron beam machining electro chemical machining electro chemical discharge machining electro discharge machining

The non-traditional machining process that essentially requires vacuum iselectron beam machiningelectro chemical machiningelectro chemical discharge machiningelectro disc...

Arjun

28.5k points

Arjun asked Feb 24, 2017

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GATE2015-3-34
Orthogonal turning of a mild steel tube with a tool of rake angle $10^\circ $ is carried out at a feed of $0.14 mm/rev$. If the thickness of the chip produced is $0.28 mm$, the values of shear angle and shear strain will be respectively $28^\circ 20′$ and $2.19$ $22^\circ 20′$ and $3.53$ $24^\circ 30′$ and $4.19$ $37^\circ 20′$ and $5.19$

Orthogonal turning of a mild steel tube with a tool of rake angle $10^\circ $ is carried out at a feed of $0.14 mm/rev$. If the thickness of the chip produced is $0.28 mm...

Arjun

28.5k points

Arjun asked Feb 24, 2017

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GATE2015-1-35
An orthogonal turning operation is carried out under the following conditions: rake angle = $5^{\circ}$; spindle rotational speed = $400 \text{ rpm}$; axial feed = $0.4 \text{ m/min}$ and radial depth of cut = $5 \text{ mm}$. The chip thickness, $t_c$, is found to be $3 \text{ mm}$. The shear angle (in degrees) in this turning process is_____

An orthogonal turning operation is carried out under the following conditions: rake angle = $5^{\circ}$; spindle rotational speed = $400 \text{ rpm}$; axial feed = $0.4 \...

Arjun

28.5k points

Arjun asked Feb 24, 2017

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GATE2015-1-23
Under certain cutting conditions, doubling the cutting speed reduces the tool life to $\left (\dfrac{1}{16} \right)^{th}$ of the original. Taylor’s tool life index ($n$) for this tool-workpiece combination will be _______

Under certain cutting conditions, doubling the cutting speed reduces the tool life to $\left (\dfrac{1}{16} \right)^{th}$ of the original. Taylor’s tool life index ($n$...

Arjun

28.5k points

Arjun asked Feb 24, 2017

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GATE Mechanical 2014 Set 4 | Question: 54
A cast iron block of $200$ $mm$ length is being shaped in a shaping machine with a depth of cut of $4$ $mm$, feed of $0.25$ $mm$/stroke and the tool principal cutting edge angle of $30^{\circ}$. Number of cutting strokes per minute is $60$. Using specific energy for cutting as $1.49$ $J/mm^3$, the average power consumption (in watt) is _______

A cast iron block of $200$ $mm$ length is being shaped in a shaping machine with a depth of cut of $4$ $mm$, feed of $0.25$ $mm$/stroke and the tool principal cutting edg...

Arjun

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Arjun asked Feb 19, 2017

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GATE Mechanical 2014 Set 4 | Question: 23
Better surface finish is obtained with a large rake angle because the area of shear plane decreases resulting in the decrease in shear force and cutting force the tool becomes thinner and the cutting force is reduced less heat is accumulated in the cutting zone the friction between the chip and the tool is less

Better surface finish is obtained with a large rake angle becausethe area of shear plane decreases resulting in the decrease in shear force and cutting forcethe tool beco...

Arjun

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Arjun asked Feb 19, 2017

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GATE Mechanical 2014 Set 4 | Question: 21
Two separate slab milling operations, $1$ and $2$, are performed with identical milling cutters. The depth of cut in operation $2$ is twice that in operation $1$. The other cutting parameters are identical. The ratio of maximum uncut chip thicknesses in operations $1$ and $2$ is _______

Two separate slab milling operations, $1$ and $2$, are performed with identical milling cutters. The depth of cut in operation $2$ is twice that in operation $1$. The oth...

Arjun

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Arjun asked Feb 19, 2017

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GATE Mechanical 2014 Set 3 | Question: 54
Which pair of following statements is correct for orthogonal cutting using a single-point cutting tool? P. Reduction in friction angle increases cutting force Q. Reduction in friction angle decreases cutting force R. Reduction in friction angle increases chip thickness S. Reduction in friction angle decreases chip thickness P and R P and S Q and R Q and S

Which pair of following statements is correct for orthogonal cutting using a single-point cuttingtool?P. Reduction in friction angle increases cutting forceQ. Reduction i...

Arjun

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Arjun asked Feb 19, 2017

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GATE Mechanical 2014 Set 3 | Question: 23
Cutting tool is much harder than the workpiece. Yet the tool wears out during the tool-work interaction, because extra hardness is imparted to the workpiece due to coolant used oxide layers on the workpiece surface impart extra hardness to it extra hardness is imparted to the workpiece due to severe rate of strain vibration is induced in the machine tool

Cutting tool is much harder than the workpiece. Yet the tool wears out during the tool-work interaction, becauseextra hardness is imparted to the workpiece due to coolant...

Arjun

28.5k points

Arjun asked Feb 19, 2017

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GATE Mechanical 2014 Set 3 | Question: 20
A straight turning operation is carried out using a single point cutting tool on an AISI $1020$ steel rod. The feed is $0.2$ $mm/rev$ and the depth of cut is $0.5$ $mm$. The tool has a side cutting edge angle of $60^{\circ}$. The uncut chip thickness (in $mm$) is _______

A straight turning operation is carried out using a single point cutting tool on an AISI $1020$ steel rod. The feed is $0.2$ $mm/rev$ and the depth of cut is $0.5$ $mm$. ...

Arjun

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Arjun asked Feb 19, 2017

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GATE Mechanical 2014 Set 2 | Question: 54
A hole of $20$ $mm$ diameter is to be drilled in a steel block of $40$ $mm$ thickness. The drilling is performed at rotational speed of $400$ $rpm$ and feed rate of $0.1$ $mm/rev$. The required approach and over run of the drill together is equal to the radius of drill. The drilling time (in minute) is $1.00$ $1.25$ $1.50$ $1.75$

A hole of $20$ $mm$ diameter is to be drilled in a steel block of $40$ $mm$ thickness. The drilling is performed at rotational speed of $400$ $rpm$ and feed rate of $0.1$...

Arjun

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Arjun asked Feb 19, 2017

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GATE Mechanical 2014 Set 2 | Question: 51
Consider the following data with reference to elementary deterministic economic order quantity model: ... The total number of economic orders per year to meet the annual demand is _______

Consider the following data with reference to elementary deterministic economic order quantity model:$$\begin{array}{|l |l|} \hline \text{Annual demand of an item} & 1000...

Arjun

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Arjun asked Feb 19, 2017

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GATE Mechanical 2014 Set 2 | Question: 22
Match the Machine Tools (Group A) with the probable Operations (Group B): ... $P-2, Q-1, R-4, S-3$ $P-3, Q-1, R-4, S-2$ $P-3, Q-4, R-2, S-1$

Match the Machine Tools (Group A) with the probable Operations (Group B):$$\begin{array}{|c|c|c|c|} \hline & \textbf{Group A} & & \textbf{Group B} \\ \hline P: & \text{Ce...

Arjun

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Arjun asked Feb 19, 2017

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GATE Mechanical 2014 Set 1 | Question: 23
The main cutting force acting on a tool during the turning (orthogonal cutting) operation of a metal is $400$ $N$. The turning was performed using $2$ $mm$ depth of cut and $0.1$ $mm/rev$ feed rate. The specific cutting pressure (in $N$/$mm^2$) is $1000$ $2000$ $3000$ $4000$

The main cutting force acting on a tool during the turning (orthogonal cutting) operation of a metal is $400$ $N$. The turning was performed using $2$ $mm$ depth of cut a...

Arjun

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Arjun asked Feb 19, 2017

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GATE Mechanical 2014 Set 1 | Question: 21
Which one of the following instruments is widely used to check and calibrate geometric features of machine tools during their assembly? Ultrasonic probe Coordinate Measuring Machine (CMM) Laser interferometer Vernier calipers

Which one of the following instruments is widely used to check and calibrate geometric features of machine tools during their assembly?Ultrasonic probeCoordinate Measurin...

Arjun

28.5k points

Arjun asked Feb 19, 2017

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GATE ME 2013 | Question: 53
In orthogonal turning of a bar of $100$ $mm$ diameter with a feed of $0.25$ $mm$/$rev$, depth of cut of $4$ $mm$ and cutting velocity of $90$ $m$/$min$, it is observed that the main (tangential) cutting force is perpendicular to the friction force ... ) cutting force is $1500$ $N$. The normal force acting at the chip-tool interface in $N$ is $1000$ $1500$ $2000$ $2500$

In orthogonal turning of a bar of $100$ $mm$ diameter with a feed of $0.25$ $mm$/$rev$, depth of cut of $4$ $mm$ and cutting velocity of $90$ $m$/$min$, it is observed th...

piyag476

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piyag476 asked Feb 19, 2017

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GATE ME 2013 | Question: 52
In orthogonal turning of a bar of $100$ $mm$ diameter with a feed of $0.25$ $mm$/$rev$, depth of cut of $4$ $mm$ and cutting velocity of $90$ $m$/$min$, it is observed that the main (tangential) cutting force is perpendicular to the friction ... tangential) cutting force is $1500$ $N$. The orthogonal rake angle of the cutting tool in degree is zero $3.58$ $5$ $7.16$

In orthogonal turning of a bar of $100$ $mm$ diameter with a feed of $0.25$ $mm$/$rev$, depth of cut of $4$ $mm$ and cutting velocity of $90$ $m$/$min$, it is observed th...

piyag476

1.4k points

piyag476 asked Feb 19, 2017