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ADVANCE TURNING SHOP, JOB NO-1, , Object _—_: Grinding of single point turning tool., , Requirements:, , @ Tools : High Speed Steel Turning Tool, (ii) = Machines : Bench Grinding machine or Tool and Cutter Grinding Machine, Theory: Grinding is a metal cutting operation performed by means of a rotating abrasive wheel that, , acts as a tool. It is used to finish work pieces which must show a high surface quality,, accuracy of shape and dimension. Mostly grinding is the finishing operation because it, removes comparatively little metal from 0.25mm to 0.50mm in most operation and the, , accuracy in dimensions is in the order of 0.00025mm., , Working Procedure: Tool Grinding can be done either by hand or by machine. Though specifically, designed tool grinders are available for grinding yet in their absence grinding of tool can be, , performed by hand which need extra care., , @, , (ii), (ii), (iv), , (vy), (vi), (vii), , Precautions:, , @, (ii), (iii), (iv), (vy), (vi), (vii), (viii), (ix), , To grind the tool, hold and support it on the work rest., , Apply light pressure in order to avoid over heating of the cutting edge., , Grind the tool either dry or wet., , When grinding the tool, intermittent dipping in water of the tool should be avoided the, , heat of the cutting edge of the tool., , Grind the tool in a direction against the cutting edge., , While grinding ensure that tool is set at center height., , During grinding set the various cutting angles as given below, , a) Back rake angle 10°, b) Side rake angle 20°, c) End relief angle 7°, , d) Side relief angle 6°, , e) End cutting edge angle 8°, , f) Side cutting edge angle 15°, g) Nose radius 1/32°, , Inspect grinding wheel for cracks or looseness., , Replace the grinding wheel if it is broken or worm out., , Ensure safety equipment like guard and hoods are in proper place., Wear tight fitting clothes and safety goggles while grinding., , Do not touch the moving wheel while grinding., , During grinding concentrate on the job., , Feed the tool slowly and gradually., , Do not set the tool rest while grinding., , Do not walk bear footed near the grinding machine.