It is required to reduce the thickness of cast iron workpiece with dimensions (L x w x t) of (230 mm x 120 mm x 25 mm) to 22 mm using shaper machine. Given that average cutting speed is 21 m/min, feed 1.2 mm/double stroke, and return/cutting time ratio is 3/4. The approach at each end is 72 mm. If the permissible depth of cut is 2 mm, determine the cutting time in the following cases: i) Using shaper with a mechanically driven ram. ii) Using shaper with a hydraulically driven ram. Solution: i) Mechanically ( ii) Hydraulically

It is required to reduce the thickness of cast iron workpiece with dimensions (L x w x t) of (230 mm x 120 mm x 25 mm) to 22 mm using shaper machine. Given that average cutting speed is 21 m/min, feed 1.2 mm/double stroke, and return/cutting time ratio is 3/4. The approach at each end is 72 mm. If the permissible depth of cut is 2 mm, determine the cutting time in the following cases: i) Using shaper with a mechanically driven ram. ii) Using shaper with a hydraulically driven ram. Solution: i) Mechanically ( ii) Hydraulically

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter5: Turning

Section5.3: Machining Operations On The Lathe

Problem 5RQ: Calculate spindle RPM and machining time for cutting a 1.5" diameter 4" long at 225 SFPM using a...

See similar textbooks

Similar questions

.cutting speed is 9m/min. The return time to cutting time is 1:4 and the feed is 3mm Q.4 (i) Find the time required for taking a cemplete cut on a plate 600 × 900 mm", if the cutting speed is 9m/min. The return time to cutting time is 1:4 and the feed is 3mm for the shaper. The clearance at each end is 75 mm. (11) A hole of 30 mm diameter and 75 mm depth is to be drilled. The feed is 1.3 mm/rev and the cutting speed is 62 m/min. Assuming tool approach and tool over travel as 6 mm. Calculate : (a) Cutting time and (b) Material removal rate Q.5 Write short note on the following - (i) Up milling and down milling processes (ii) Balancing of grinding wheels (iii) Gear hobbing ittp3.7 w w w.ItuommC.com
across the surface and (b) the maximum metal removal rate during cutting A slab milling operation is performed on the top surface of a steel rectangular workpiece 12.0 in long by 2.5 in wide. The helical milling cutter, which has a 3.0 in diameter and ten teeth, is set up to overhang the width of the part on both sides. Cutting speed is 125 ft/min, feed is 0.006 in/tooth, and depth of cut = 0.300 in. Determine (a) the actual machining time to make one pass across the surface and (b) the maximum metal removal rate during the cut. (c) If an additional approach distance of 0.5 in is provided at the beginning of the pass (before cutting begins), and an overtravel distance is provided at the end of the pass equal to the cutter radius plus 0.5 in, what is the duration of the feed motion.
Given that the length of a work-piece made from copper alloy to be face-milled is 250 mm and the width is 25 mm. The cutter diameter is 150 mm and the tooth number is 10. 1. If it takes 20 seconds to perform the cutting, suggest a cutting speed (in mm/s) and a feed (in mm/rev) to be used. 2. Give another set of values of cutting speed (in mm/s) and feed (in mm/rev) that can give the same cutting time as above.
A turning operation is performed on a cylindrical work part whose diameter = 150 mm and length = 500 mm. Cutting speed = 3.0 m/s, feed = 0.3 mm/rev, and depth of cut = 2 mm. Determine: a. the cutting time and, b. the material removal rate. Equations used Tm= TD.L fv
A shaper is operated at 120 cutting strokes per minute and is used to machine a work piece of 250 mm in length and 120 mm wide. Use a feed of 0.6 mm per stroke and a depth of cut of 6 mm. Calculate the total machining time to for machining the component. If the forward stroke is completed in 230°, calculate the percentage of the time when the tool is not contacting the work piece.
Machining time required reduce a mild steel rod of diameter 60mm, initial length (L) 125mm to final length (L1) 120mm to 58 mm by turning a carbide insert. If the approach length and over run length are 5 mm and 1 mm respectively, take Cutting speed as 20 m/min and feed is =0.2 mm/rev, and the depth of cut is 0.5mm
A cylindrical workpiece has a 14.0 in diameter and has 30 in long. It is to be turned in an engine lathe at the following cutting conditions: cutting speed = 400 ft/min, feed = 0.015 in/rev, and depth of cut = 0.150 in. Determine the time to complete one turning pass if the approach and overtravel allowances are each 0.25 in (total = 0.50 in). Note: 1 ft = 12 in
The face milling cutter of D = 200 mm used to cut a block which is 200 mm H, 1=480 mm, if f- 0.7 mm/rev is used and the overrun of the cutter is 12 mm and cutting speed 320 mm/min. Calculate the machining time. Cuttin
Calculate the time required for completing a 5mm deep finishing cut on a 150mm wide, 600mmlong face of a 25mm thick steel block using a face milling cutter of 150mm diameter with 6teeth. The cutting condition are Vc =1.5m/sec and fz = 0.1mm.
17) A50-mm-dia endmill cuts 6061 aluminum with 30% tool engagement at a depth of 6 mm. The tool rotates at 200 rpm and is feeding at 250 mm/min. There are 2 teeth set at a rake angle of 10°. a. Calculate the required power of cutting. b. Determine the spindle torque. c. Determine the cutting force on each tooth. d. If the thrust force is measured to be 350N, estimate the tool-chip interface friction coefficient. How could you physically verify your power estimate?
Turning Operation In a production turning operation, the foreman has decreed that a single pass must be completed on the cylindrical workpiece in 4.8 min. The piece is 400 mm long and 150 mm in diameter. Using a feed = 0.43 mm/rev and a depth of cut = 4.0 mm, what cutting speed must be used to meet this machining time requirement? Hint: Re-arrange the Tm equation to find v in m/min Tm= T.DO.L v.f 1.522
A surface of 43 mm x 246 mm will be machined by using a shaper and 7 mm deep stock will be removed from the surface. The shaper is operating at 24 strokes/minute and feed is 0.7 mm/stroke. If the maximum stroke length is 827 mm and allowable depth of cut is 0.4 mm for both of rough and finish cuts, what is the total machining time, in minutes ?