Advance Machine Tools · Production Engineering · GATE ME
Marks 1
1
The preparatory functions in Computer Numerical Controlled (CNC) machine programming are denoted by the alphabet
GATE ME 2024
2
Match the following part programming codes with their respective functions
GATE ME 2016 Set 3
3
During the development of a product, an entirely new process plan is made based on design logic, examination of geometry and tolerance information. This type of process planning is known as
GATE ME 2015 Set 2
4
A drill is positioned at point $$P$$ and it has to proceed to point $$Q.$$ The coordinates of point $$Q$$ in the incremental system of defining position of a point in $$CNC$$ part program will be
GATE ME 2015 Set 2
5
The function of interpolator in a $$CNC$$ machine controller is to
GATE ME 2015 Set 1
6
A robot arm $$PQ$$ with end coordinates $$P(0,0)$$ and $$Q(2,5)$$ rotates counter clockwise about $$P$$ in the $$XY$$ plane by $${90^ \circ }$$. The new coordinate pair of the end point $$Q$$ is
GATE ME 2014 Set 2
7
For machining a rectangular island represented by coordinates
$$P(0,0), Q(100,0), R(100,50)$$ and $$S(0,50)$$ on a casting using $$CNC$$ milling machine, an end mill with a diameter of $$16$$ $$mm$$ is used. The trajectory of the cutter center to machine the island $$PQRS$$ is
$$P(0,0), Q(100,0), R(100,50)$$ and $$S(0,50)$$ on a casting using $$CNC$$ milling machine, an end mill with a diameter of $$16$$ $$mm$$ is used. The trajectory of the cutter center to machine the island $$PQRS$$ is
GATE ME 2014 Set 1
8
A $$CNC$$ vertical milling machine has to cut a straight slot of $$10$$ $$mm$$ width and $$2$$ $$mm$$ depth by a cutter of $$10$$ $$mm$$ diameter between points $$(0, 0)$$ and $$(100, 100)$$ on the $$XY$$ plane (dimensions in $$mm$$). The feed rate used for milling is $$50$$ $$mm/min.$$ Milling time for the slot (in seconds) is
GATE ME 2012
9
For generating coon's surface we require
GATE ME 2008
10
Which type of motor is used in axial or spindle drives of $$CNC$$ m/c tools
GATE ME 2007
11
$$NC$$ contouring is an example of
GATE ME 2006
12
Machining of complex shapes on $$CNC$$ machines requires
GATE ME 2002
13
In computer aided drafting practice, an arc is defined by
GATE ME 2000
14
Cellular manufacturing is suitable for
GATE ME 2000
15
$$CNC$$ machines are more economical to use even for simple turning jobs.
GATE ME 1994
16
$$CNC$$ machines are more accurate than conventional machines because they have a high resolution encoder and digital readouts for positioning
GATE ME 1994
17
In $$PTP$$ type of $$NC$$ system
GATE ME 1992
18
Numerically controlled machine tools are better suited for .................. (batch/mass) production, because their setup time is ......... (larger / smaller) in comparison to special purpose machine tools.
GATE ME 1991
19
In $$NC$$ part programming spindle speed of $$730rpm$$ will be coded by the magic - $$3$$ rule as
GATE ME 1989
Marks 2
1
Circular arc on a part profile is being machined on a vertical $$CNC$$ milling machine. $$CNC$$ part program using metric units with absolute dimensions is listed below:
$$\eqalign{ & N60\,\,\,\,G01\,\,\,\,X\,30\,\,\,\,Y\,55\,\,\,\,Z\,5\,\,\,\,F50 \cr & N70\,\,\,\,G02\,\,\,X\,50\,\,\,\,Y\,35\,\,\,\,R\,20 \cr & N80\,\,\,\,G01\,\,\,\,Z\,5 \cr} $$
The coordinates of the center of the circular arc are:
GATE ME 2017 Set 1
2
A point $$P\left( {1,\,\,\,3,\,\,\, - 5} \right)$$ is translated by $$2\widehat i + 3\widehat j - 4\widehat k$$ and then rotated counter clockwise by $${90^ \circ }$$ about the $$z$$-axis. The new position of the point is
GATE ME 2016 Set 3
3
The figure below represents a triangle $$PQR$$ with initial coordinates of the vertices as $$P(1,3),$$ $$Q(4,5)$$ and $$R(5,3.5).$$ The triangle is rotated in the $$X-Y$$ plane about the vertex $$P$$ by angle in clockwise direction. If sin $$\theta = 0.6$$ and cos $$\theta = 0.8$$, the new coordinates of the vertex $$Q$$ are
GATE ME 2016 Set 1
4
A triangular facet in a $$CAD$$ model has vertices: $${P_1}\left( {0,0,0} \right);\,\,{P_2}\left( {1,1,0} \right)$$ and $$\,{P_3}\left( {1,1,1} \right).$$ The area of the facet is
GATE ME 2015 Set 1
5
In a $$CNC$$ milling operation, the tool has to machine the circular arc from point $$(20, 20)$$ to $$(10, 10)$$ at sequence number $$5$$ of the $$CNC$$ part program. If the center of the arc is at $$(20, 10)$$ and the machine has incremental mode of defining position coordinates, the correct tool path command is
GATE ME 2015 Set 3
6
For the $$CNC$$ part programming, match Group A with Group B:
GATE ME 2014 Set 2
7
In a $$CAD$$ package, mirror image of a $$2D$$ points $$P(5, 10)$$ is to be obtained about a line which passes through the origin and makes an angle of $${45^ \circ }$$ counterclockwise with the $$X$$-axis. The coordinates of the transformed points will be
GATE ME 2013
8
In a $$CNC$$ program block, $$N002\,\,\,\,G02\,\,\,\,G91\,\,\,\,X40\,\,\,\,Z40....,\,\,\,\,G02\,\,\,\,\& \,\,\,\,G91$$ refer to
GATE ME 2010
9
Match the following
GATE ME 2009
10
In the feed drive of a point to point open loop $$CNC$$ drive, a stepper motor rotating at $$200steps/rev$$ drives a table through a gear box and lead screw-nut mechanism (pitch $$=4mm,$$ number of starts $$=1$$). The gear ratio $$=$$ Output speed / input speed is given by $$U=1/4.$$ The stepper motor (driven by voltage pulses from a pulse generator) executes $$1$$ step / pulse from a pulse generator) executes $$1$$ step / pulse of the generator. The frequency of the pulse train from the pulse generator is $$f=10000$$ pulses per minute.
The basic length unit $$(BLU)$$, i.e. the table movement corresponding to $$1$$ pulse of the pulse generator
GATE ME 2008
11
In the feed drive of a point to point open loop $$CNC$$ drive, a stepper motor rotating at $$200steps/rev$$ drives a table through a gear box and lead screw-nut mechanism (pitch $$=4mm,$$ number of starts $$=1$$). The gear ratio $$=$$ Output speed / input speed is given by $$U=1/4.$$ The stepper motor (driven by voltage pulses from a pulse generator) executes $$1$$ step / pulse from a pulse generator) executes $$1$$ step / pulse of the generator. The frequency of the pulse train from the pulse generator is $$f=10000$$ pulses per minute.
A customer insists on a modification to change the $$BLU$$ of the $$CNC$$ drive to $$10$$ Microns without changing the table speed. The modification can be accomplished by
GATE ME 2008
12
Which among the $$NC$$ operations given below are continuous path operations? Arc Welding $$(A$$ $$W)$$, Milling $$(M),$$ Drilling $$(D),$$ Punching in Sheet Metal $$(P)$$ Laser Cutting of Sheet Metal $$(LC),$$ Spot Welding $$(SW).$$
GATE ME 2005
13
The tool of an $$NC$$ machine has to move along a circular arc from $$(5,5)$$ to $$(10,10)$$ while performing an operation. The center of the arc is at $$(10,5).$$ Which one of the following $$NC$$ tool path commands performs the above mentioned operation?
GATE ME 2005
14
In a $$2-D$$ $$CAD$$ package, clockwise circular arc of radius, $$5,$$ specified from $${P_1}\left( {15,10} \right)$$ to $${P_2}\left( {10,15} \right)$$ will have its center at
GATE ME 2004
15
During the execution of a CNC part program block
$$NO20\,\,\,\,GO2\,\,\,\,X45.0\,\,\,\,Y25.0\,\,\,\,R5.0.$$ The type of tool motion will be
$$NO20\,\,\,\,GO2\,\,\,\,X45.0\,\,\,\,Y25.0\,\,\,\,R5.0.$$ The type of tool motion will be
GATE ME 2004
16
In finish machining of an island on a casting with $$CNC$$ milling machine, an end mill with $$10$$ $$mm$$ diameter is employed. The corner points of the island are represented by $$(0,0), (0,30), (50,30)$$ and $$(50,0)$$. By applying cutter radius right compensation, the trajectory of the cutter will be
GATE ME 2000
17
A cylinder of $$155$$ $$mm$$ is to be reduced $$150$$ $$mm$$ diameter in one turning cut with a feed of $$0.15$$ $$mm$$/ revolution and a cutting speed of $$150$$ $$m/min$$ on a $$NC$$ lathe. What are the programmed spindle speeds programmed feed rate, and the material removal rate?
GATE ME 1998
18
In a point to point control $$NC$$ machine, the slides are positioned by an integrally mounted stepper motor drive. If the specification of the motor is $$1$$ deg/pulse, and the pitch of the lead screw is $$3.6$$ $$mm,$$ what is the expected positioning accuracy?
GATE ME 1997
19
With reference to $$NC$$ machines, which of the following statements is wrong?
GATE ME 1993