4. The drilling speed for cast iron is assumed to be 70 ft/min. Find the time required to drill two holes in each of 500 castings if each hole has a diameter of % and is 1" deep. Use .010" feed and allow 14 minute per hole for setup. Page #
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- 1. If a machinist wanted to drill a % inch hole in a piece of machine steel using a high speed steel drill. At what speed in revolutions per minute should he operate the drill press? 2. Find the revolutions per minute of an 8 mm drill if it is used to cut an aluminum workpiece using a high carbon steel drill. 3. The rpm setting of the drill press is set to 600 rpm. What is the maximum diameter in inches of a high speed drill if it is used to drill a tool steel material? 4. A drill press has the following rpm settings; 350, 600, 1100, & 1600. What rpm setting must be used if a 15 mm high speed steel drill is used to cut brass workpiece? 5. A machine operator drills a hole of a 3/8 inch diameter to a stainless steel using a carbon steel drill. He sets the drill press rpm setting to 900 rpm. Is he operating at correct setting? If not, then what must be the correct rpm setting considering that the machine has the following rpm settings of 300, 600, 900, 1200, and 1800?Please solve it correctly , Don't Use Ai tool. (1) A twist drill bit is used to drill a hole of diameter 2.0 at 4578.1 rpm at a feed rate of 2.5 in/min. Calculate the MRR in in^3/min. Take "pi" = 3.14. Round your answer to the nearest tenth.It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 rpm, then the speed of the lead screw will be
- 45) Find the RPM for turning a 1 1/4 inch shaft on a lathe with the material having a cutting speed of 150 ft/min.B) 280 made for during pattern making why do we need to add feeders to the casting? Make suitable assumptions for your answer A part is required to be machined to match the drawing illustred in figure 15 marks QB, Calculate the machining time for the shown aluminum cylindrical shaft if the following data are given: - - - - The wrought dimension of the received shaft is 90 mm in diameter and 240 mm in length. The rotation speed during roughing is 650 r.p.m The depth of cut for roughing operation for longitudinal and face cutting is 2.5 mm and the feed is 0.4 mm/rev. The rotational speed for finish operation is 850 r.p.m; the depth of cut for finish operation is 0.2 mm and the feed is 0.05 mm/rev. for longitudinal and face cutting. The rotational speed during drilling is 500 r.p.m and the average drilling feed is 0.4 mm/rev. 60 40 Question (3) [40 Total marks] Ⓒ50 60 09 0 60 20 SECTION B: ANSWER ONE QUESTION ONLY The total marks for this section are [40 marks] 2 OTo make 200 cast iron tool holders as shown in Figure 2 per order, two orders per year expected, and the inside hole surfaces should be smooth, what manufacturing processes would you suggest for the part. a)Machining processes from the 2X1.5 inch iron bar stocks with no initial tooling cost. cut the bar into 6 inch long pieces with bandsaws mill all the flat surfaces on a milling machine drill the two holes on the same milling machine or a drill press b) sand casting, which has much lower initial tooling cost than die casting and reasonable production rate. drill to make the smooth inside surfaces of the two holes on a milling machine or drill press. c) forging process with rounded edges and corners. drill the two holes on a milling machine or drill press. d)die casting, which can make the part in high production rate with smooth surface and precise dimension
- If a 0.050" depth of cut is taken on the diameter of a workpiece, by how much will the diameter be reduced?Determine the number of strokes per minute at which the shaper should run to machine a piece of copper having a cutting speed of 80 feet per minute and with stroke adjusted to 6 inches.A mild steel specimen of Initial diameter of 53.5 mm is turned to final diameter of 47 mm for an initial length of 154 mm on a lathe machine. Using the given data find the following. (i) Feed of 0.4 mm/rev & Depth of cut is 0.5 mm (ii) During machining the tool's approach length is 5 mm, over run length is 2mm (iii) Total time required to complete the turning operation is 59.6 minutes (a) Find number of passes to finish the entire turning operation ( (b) The actual length of the turning operation in mm ('
- A mild steel specimen of Initial diameter of 53.5 mm is turned to final diameter of 47 mm for an initial length of 154 mm on a lathe machine. Using the given data find the following. (i) Feed of 0.4 mm/rev & Depth of cut is 0.5 mm (ii) During machining the tool's approach length is 5 mm, over run length is 2mm (iii) Total time required to complete the turning operation is 59.6 minutesA mild steel specimen of Initial diameter of 51.5 mm is turned to final diameter of 48 mm for an initial length of 151 mm on a lathe machine. Using the given data find the following. (i) Feed of 0.1 mm/rev & Depth of cut is 0.5 mm (ii) During machining the tool's approach length is 7 mm, over run length is 2mm (iii) Total time required to complete the turning operation is 48.8 minutes (a) Find number of passes to finish the entire turning operation (b) The actual length of the turning operation in mm ( (c)The time required to complete one single turning operation in minutes (d) Spindle speed in rpmWhat is the cutting speed of turning in the unit of m/min, when main axis spindle speed is 2,409 rpm and external diameter is 86mm ? Answer in 2 decimal points. Calculate the theoretical spindle rotational speed in rpm required to drill a 1 mm hole in copper using high speed steel drill. The recommende cutting speed is as following. The thickness of the copper plate is 24. (Leave the answer in numerical value, no need to key in 'rpm') Typical cutting speeds (m/min) High speed steel Material Tungsten carbide Aluminum 100 500 60 330 Copper Hard brass 45 230 Bronze 35 180 Mild steel 28 250 Cast iron 20 160