What workpiece factors might cause a four-flute endmill to be selected over a two-flute endmill for an application?
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What workpiece factors might cause a four-flute endmill to be selected over a two-flute endmill for an application?
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- ENT 152 Computer Aided Manufacturing I Milling Worksheet-SHOW ALL WORK A milling operation is to be performed at 100 sfpm at .005 ipt. A 500" diameter, 4 flute HSs end mill is to be used. The operation is a slot .100" deep across the diagonal of a rectangular part 4 inches wide and 6 inches long. The material is 4140 medium carbon steel (BHN-250). Use a specific HP of 1.2 HP/in/min. Calculate: RPM feed (ipm) feed (ipr) Length of cut Cut time MRR a. c. b. f. HP required at the spindle HP required at the motor (assume the drive system is 809% efficient) C. d. h.Briefly describe a gang drill press and its benefit.A long workpiece, with the length-to-dimeter ratio that exceeds factor 10, is to be machined. Which workholding should provide the lowest deflection? Collet in the spindle and a live center in the tailstock Chuck on the spindle, a live center in the tailstock, and a follower rest Mandrel Solid center with a dog and a dog plate on the spindle, a live center in the tailstock Faceplate
- What are the parts of taper turning?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?The end of a large tubular workpart is to be faced on a NC vertical boring mill. The part has an outside diameter of 38.0 in and an inside diameter of 24.0 in. If the facing operation is performed at a rotational speed of 40.0 rev/min, feed of 0.015 in/rev, and depth of cut of 0.180 in, determine (a) the cutting time to complete the facing operation and the cutting speeds and metal removal rates at the beginning and end of the cut.
- A NC lathe cuts two passes across a cylindrical workpiece under automatic cycle. The operator loads and unloads the machine. The starting diameter of the work is 3.00 in and its length = 10 in. The work cycle consists of the following steps (with element times given in parentheses where applicable): 1 - Operator loads part into machine, starts cycle (1.00 min); 2 - NC lathe positions tool for first pass (0.10 min); 3 - NC lathe turns first pass (time depends on cutting speed); 4 - NC lathe repositions tool for second pass (0.4 min); 5 - NC lathe turns second pass (time depends on cutting speed); and 6 - Operator unloads part and places in tote pan (1.00 min). In addition, the cutting tool must be periodically changed. This tool change time takes 1.00 min. The feed rate = 0.007 in/rev and the depth of cut for each pass = 0.100 in. The cost of the operator and machine = $39/hr and the tool cost = $2.00/cutting edge. The applicable Taylor tool life equation has parameters: n = 0.26 and…Your manager has asked you to submit a report based on lead screws and screw jacks on plant premises. You need to include following calculations for the report. 1. The lead screw of a lathe has Acme threads of 50 mm outside diameter and 8 mm pitch. The screw must exert an axial pressure of 2500 N in order to drive the tool carriage. The thrust is carried on a collar 110 mm outside diameter and 55 mm inside diameter and the lead screw rotates at 30 r.p.m. Determine (a) the power required to drive the screw; and (b) the efficiency of the lead screw. Assume a coefficient of friction of 0.15 for the screw and 0.12 for the collar. 2. The lead screw of a lathe has Acme threads of 60 mm outside diameter and 8 mm pitch. It supplies drive to a tool carriage which needs an axial force of 2150 N. A collar bearing with inner and outer radius as 30 mm and 60 mm respectively is provided. The coefficient of friction for the screw threads is 0.12 and for the collar it is 0.10. Find the torque…What products can be produced from turning process in lathe machine. (other than spur gears or screw)
- Sample Problem 3 How long will it take to mill a % inch by 2 long keyway in a 3 in diameter shafting with a 24 tooth cutter turning at 100 rpm and 0.005 inch feed per tooth?Name the milling machine operation in which the special profiles (contours) can be produced in the workpiece.To mention some types of engine lathes such as : Standard engine,Manufacturing engine,Bench lathers , special purpose lathers , what power the engine to operate in order to machine a workpiece? (a) Gasoline engine (b) Diesel engine (c)Electric motor (d) Air compressor