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- A o 20 mm through hole is to be drilled in a 30 mm thick plate using a double fluted, 120° lip angle drill The drill tip is at a distance of 3 mm from the plate surface when cutting is started and an over travel of 2 mm is recommended as a margin to ensure drilling through the full thickness of the plate. If the drill rotates at 500 rev/min and the feed per tooth is 0.01 mm,find the machining time of the operation.A 0.4-inch diameter bit is used in a vertical or vertical drill that operates at 300 rpm. If the feed is 0.005 in / rev, what is the MRR? What is the MRR if the drill diameter is doubled? What is the power required in the drill if the material is an annealed AISI 1080?Drilling, diameter = 0.375 inches, feed is 0.003 inches/tooth, number of teeth is 2, rotation speed is 750 rev/min. Material is tough Copper alloy. Find: MRR, power at the motor, power at the tool, and torque at the tool. Work the problem in U.S. units and give the answers in U.S. units.
- 5. Blind hole 20 mm diameter, 60 mm deep are being drilled in steel stock, drilling spindle speed is 500 rpm, feed 0.3 mm/rev, point angle of drill is 1180. Machining time ( in minutes ) per hole will be .. (a) 0.40, (b) 0.42, (c) 0.44, (d) 0.46, (e) 0.48A 12" through hole is to be drilled in a 1 inch thick steel plate. A standard twist drill having a nose angle of 120 degrees is to be used. The drill press is set to operate at a cutting speed of 20 feet per minute and a feed of 0.010 ipr. What is the machining time required to drill the hole?Sample Problem 1 A man create a 5 inches thick hole with a 2" diameter on an aluminum flat bar. Using a feed rate of 0.001 in/ rev with a drill spindle speed of 100 rpm. Calculate the following: a) Drill penetration speed in (in/min) b) Drilling time (min) c) Material Removal Rate (in? /min).
- The cutting speed in in/min of a 12 mm drill operating at 600 rpm is nearly equal toQ1\ a) The operation of drilling is to be done with a 25.4 mm ( diameter) twist drill in a brass workpiece. The hole is a blind-hole with the point angle = 118°, and a depth of 50 mm . The speed of 25 m/min, feed of 0.25 mm/rev. Calculate: (1) the time of cutting to complete the drilling operation, and (2) metal removal rate during the operation.2. Through hole of 12 mm diameter is to be drilled in a steel plate of 20 mm thickness, drilled spindle speed is 20 m/min, feed 0.25 mm/rev and drill point angle is 120°, the amount of material removed at the first 10 sec after full engagement of drill will be mm/sec. (a) 2300, (b) 2400, (c) 2500, (d) 2600, (e) 2700
- Through holes of 10 mm diameter are to be drilled in a steel plate of 20 mm thickness. Drill spindle speed is 300 rpm, feed 0.2 mm/rev and drill point angle is 120° .Assuming drill overtravel of 2 mm. Calculate the time for producing a hole.A drilling operation is performed to create a through hole on a steel plate that is 20 mm thick. Cutting speed = 0.4 m/s, and feed = 0.20 mm/rev. The 18-mm-diameter twist drill has a point angle of 120°. Determine the following once the drill reaches full diameter: a. the machining time and, b. the metal removal rate Equation used Tm TD₂L fvCalculate the RPM for drilling at 600 SFM and feed rate (in/min) for a chip load of .010 (in/rev)