86751. The grinding wheel speed (surface speed in m/min) usually varies from
86752. The factor considered for evaluation of machinability is
86753. In oblique cutting system, the tool may or may not generate a surface parallel to the workface.
86754. The plunge grinding requires very __________ speed.
86755. In conventional milling, the cutting force tends to lift the work.
86756. In machining metal, cutting force at the cutting edge is measured by a
86757. With the same tool life, the maximum material per minute is removed by
86758. The process of removing metal by a cutter which is rotated against the direction of travel of workpiece, is called
86759. A feed gear box for a screw cutting lathe is designed on the basis of
86760. In American Standard Association (A S A) system, if the tool nomenclature is 8-6-5-5-10-15-2 mm, then the side rake angle will be
86761. The abrasive recommended for grinding materials of low tensile strength is
86762. The chamfering is an operation of
86763. The hard grade grinding wheels are denoted by the letters
86764. The tailstock set over required to turn a taper on the entire length of a workpiece having diameters D and d is
86765. The angle formed by the leading edge of the land with a plane having the axis of the drill, is called
86766. The lip clearance angle should decrease towards the centre of the drill than at the circumference.
86767. If the shear angle is large and the chip-tool contact area is low, then the tool life will be more.
86768. In drilling brass, a drill with
86769. The carbide tools operating at very low cutting speeds (below 30 m/min)
86770. In oblique cutting of metals, the cutting edge of the tool is
86771. A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through-hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is
86772. The tail stock and the carriage of a lathe may be guided on same or different guideway.
86773. In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is
86774. Surface grinding is done to produce
86775. Gear finishing operation is called
86776. The tool life is said to be over if
86777. Continuous chips with built up edge are formed during machining of
86778. The rate of removing metal is __________ by increasing the depth of cut.
86779. The method of grinding used to produce internal cylindrical holes and tapers, is
86780. The tool life is __________ cutting speed.
86781. For machining a cast iron workpiece by a high speed steel tool, the average cutting speed is
86782. The vector sum of cutting velocity and chip velocity is __________ shear velocity.
86783. For harder alloy steel, the point angle of the drill is kept
86784. An open structure of a grinding wheel is denoted by the number 1 to 8.
86785. In an orthogonal cutting, the depth of cut is halved and the feed rate is double. If the chip thickness ratio is unaffected with the changed cutting conditions, the actual chip thickness will be
86786. For turning small taper on long workpiece, the suitable method is
86787. In a milling operation, two side milling cutters are mounted with a desired distance between them so that both sides of a workpiece can be milled simultaneously. This set up is called
86788. The time (in minutes) for a drilling a hole is given by where h is the
86789. Crack in grinding wheel is developed due to
86790. The average cutting speed for turning mild steel with a high speed steel tool is
86791. In a shaper, the metal is removed during
86792. The aluminium oxide abrasive is chiefly used for grinding
86793. In __________ operation, the chip thickness is minimum at the beginning of the cut and it reaches to the maximum when the cut terminates.
86794. In __________ operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work.
86795. The taper on the lathe spindle is
86796. Which of the following statement is correct in regard to centreless grinding?
86797. The specific cutting energy used for establishing the machinability of the metal depends upon its
86798. The form grinding is used to grind gear teeth, threads, splined shafts and holes.
86799. Which of the following parameters govern the value of shear angle in continuous chip formation?
86800. The relief or clearance at the cutting edge of a flat drill varies from
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