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Consider the following statements: 1. HSS tools wear very rapidly, whereas in cemented carbide tools, even though hardness is retained, crater wear can occur due to solid-state diffusion. 2. Cutting tools made of Super-HSS, also known as cobalt-based HSS, are made by adding 2% to 15% of cobalt which increases the cutting efficiency at heavier cuts by increasing the hot hardness and wear resistance. 3. Tools failure due to excessive stress can be minimized by providing small or negative rake angles on brittle tool materials, protecting tool tip by providing large side-cutting edge angles, and honing a narrow chamfer along the cutting edge. Which of the above statements are correct?
Which of the following forces are measured directly by strain gauges or force dynamometers during metal cutting? 1. Force exerted by the tool on the chip acting normally to the tool face 2. Horizontal cutting force exerted by the tool on the workpiece 3. Frictional resistance of the tool against the chip flow acting along the tool face 4. Vertical force which helps in holding the tool in position Select the correct answer using the codes given below.
Which of the following statements is/are correct about a shaper and planer? I) A shaper is intended for small jobs, while a planer is intended for large jobs. II) A shaper has higher machining accuracy compared to a planer. III) A shaper is relatively lighter, smaller and cheaper as compared to a planer.
If d=depth of cut in mm, f=feed in mm/stroke, n=stroke/min, l=length of stroke in mm, m= ratio of return stroke time to cutting stroke time, then find the formula for metal removal rate.
Flank wear occurs mainly on the 1. Nose part of the cutting tool 2. Front relief face and side relief face of the cutting tool 3. Face of the cutting tool at the shortest distance from the cutting edge Which of the above is/are correct?
What is the general categorisation of equipments for manufacturing garments?
1. Measuring tools
2. Marking tools
3. Cutting tools
4. Pressing tools
The cutting tool used in shaper is a _______ point cutting tool.
Which stroke is cutting stroke in shaper?
Cutting speed= (length of the cutting stroke) / (time required by the cutting stroke).
If n=number of strokes of the ram per minute or rpm of the bull wheel, l=length of the cutting stroke in mm, m= the ratio between return time to cutting time, then find the formula for cutting stroke.