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41 Cards in this Set
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Machine Shop: Cutting Speed, v: |
v =πDN |
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Formula of Time of Milling and Time |
Time of Milling = Length to be cut/ Cutting rate Time = Length to be cut/ No.of teeth x Speed,N x Feedrate |
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Hacksaw formula |
Time= Length to be cut/ Cutting rate For a hacksaw, there is only one cut stroke per revolution Time = Length to be cut/ Speed x (stroke/rev) x (feed/stroke) |
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Welding formula |
* time = length to be weld / welding rate * volume consumption of gas , V V = ( Vo + Va)L Where: V = total gas consumption of oxygen and acetylene Vo= volume of oxygen consumed per unit length of seam Va = volume of acetylene needed per unit length of seam L = length of seam |
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Cutting formula |
Time of cutting = length to be cut / cutting rate |
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(prob.1) Determine the time in seconds, to saw a rectangular magnesium bar 5 in. wide and 2 in. thick if the length of cut is 5 inch. The power hacksaw does 120 strokes/min and the feed/stroke is 0.127 mm. |
500 seconds |
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(prob.2) In an Oxy-Acetylene manual welding method to weld a 3 1/2 ft. long seam in a 0.375" thick steel plate at a consumption rate of 9 ft³/ft for oxygen and 7 ft³ft for acetylene. Compute for the total combined gas consumption in ft³. |
56 ft³ |
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(prob.3) compute for the drill penetration in in/min when a drill turns at 1200 rpm and the feed of 0.005 in/rev. Materials is steel. |
6 in/min |
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(prob.4) what is the value in degree of 1 radian? |
57.29° |
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(prob.5) compute the manual cutting time in minutes, of a steel plate 4 ft. by 8ft. by 2.5 cm thick with a hand cutting speed of 3.8 to 4 mm/sec, cutting lengthwise. |
10.42 minutes |
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(prob.6) Compute the cutting speed in fpm of a workpiece with 2 inches diameter and running at 100 rpm. |
52.35 ft/min |
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(prob.7) Compute the cutting speed in fpm of a workpiece with 4 inches diameter and turning at 100 rpm? |
104 ft/min |
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(prob.8) Determine the average time to put by automatic oxygen-acetylene (machine) crosswise a 4ft. by 8 ft. by 4in thick steel plate |
360 sec |
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(prob.9) Calculate the fpm for machining a cast iron workpiece 6 inches in diameter. The lowest cutting speed for cast iron is 50 fpm |
31.83 rpm |
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(prob.10) With the arc welding rate of 18 in/min, how long will it take to weld 1/2 in thick plate by 3 feet long seam? |
2 min |
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(prob.11) How long will it take to mill a 3/5" by 2" long keyway in a 3" diameter shafting with a 24 tooth cutter turning at 100 rpm and 0.005" feed/tooth? |
0.166 min |
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(prob.12) How long will it take to saw a rectangular piece of aluminum plate B in wide and 1 1/2 in. thick if the length of the cut is 8 in |
11.11 min |
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(prob.13) Using oxyacetylene welding method to weld a 3 ft long seam in a 3/8 in. thick palte at a consumption rate of 9 ft³/ft of weld for oxygen and 7 ft³/ft for acetylene. what is the total combined gas consumption in ft³? |
48 ft³ |
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(prob.14) A grinding wheel rotates 1750 rpm and has a surface speed of 2290 ft/min. Find the diameter of the wheel in inches. |
5 in |
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(prob.15) To facilitate the milling (roughing) work of cast steel material using a 1 1/2 inch diameter cutter choose between the two available stock. Find the speed of the cutter in rpm. High speed steel cutter with a cutting speed of 50 fpm, carbide tipped cutter with a cutting speed of 200 fpm. |
509 rpm |
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(prob.16) A piston reciprocates 100 times per minute ( single stroke). The length of the stroke is 6 inch. What is the average wristpin velocity in ft/min? |
50 ft/min |
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(prob.17) A workpiece turning at 300 rpm has a tangential speed of 15 ft/s. Find the diameter of the workpiece. |
11.46 in |
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(prob.18) A workpiece turning at 20 rad/s has a diameter of 4 inch. Find the peripheral speed of workpiece. |
3.33 fps |
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(prob.19) Two plates 4 ft by 8 ft plate 1/2 in thick is to be joined lengthwise. A welding machine to be used has a welding rate of 20 in/min. How long will it take to join the plates? |
4.80 min |
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(prob.20) A 10 ft long seam can be weld in 10 min. The welding rate is? |
12 in/min |
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(prob.21) A seam can be weld in 3 min. If welding rate is 15 in/min, find the length of seam. |
45 in |
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(prob.22) How long will it take to mill 1/2" long keyway by means of 25 teeth cutter turning at 120 rpm and 0.008" feed/tooth. |
3.75 seconds |
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(prob.23) A 5 inch long keyway is to be mill at the rate of 0.2 in/min. How long it take to mill the keyway? |
25 sec |
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(prob.24) It take 1 min to mill a 3/4" x 4" keyway of a hub by means of a cutter having 30 teeth at 120 rpm. Find the equivalent feed per tooth, in/tooth. |
0.00111 in/tooth |
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(prob.25) How long will it take to cut a rectangular plate 4 ft wide by means of a saw that has a speed of 160 rev/min and an average feed per stroke of 0.009in? |
33.33 minute |
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(prob.26) A 4ft wide x 8ft long and 1/2 inch thick steel plate is to be cut into 4 equal parts crosswise. If cutting rate is 0.02 in/stroke and saw speed is 110 rpm, how long will it take to do the job? |
65.45 min |
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(prob.27) it takes 5 min to cut a plate 20 ft long by means of a saw having a speed of 250 rpm. What is the average feed per stroke of the saw, in/stroke? |
0.192 in/stroke |
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(prob.28) An oxyacetylene cutter is use to cut a 4ft by 8ft steel plate crosswise and divided the whole plate into five equal parts. If the cutting rate is 10 in per minute, how long will it take to cut the plates. |
19.20 min |
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(prob.29) Using oxyacetylene welding method to weld 10 ft long seam in a 1/2 in. thick plate at a consumption rate of 10ft³/ft oxygen and 8 ft³/ft for acetylene. What is the total gas consumption? |
180 ft³ |
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(prob.30) A 24ft³ lateral surface for a cylindrical tank is to be made by joining 2 ft by 2 ft steel plate to form 6 ft x 4 ft. The consumption rate for both oxygen and nitrogen is 20 ft³/ft using oxyacetylene welding method. Find the total gas consumption needed , ft³. |
280 ft³ |
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(prob 31) A 10ft x 20ft plate is to be divided into 8 pieces 5 ft x 5ft steel plate by means of an oxyacetylene cutter that has a cutting rate of 10 in per minute. How long will it takes to do the job?(in minute) |
60 min |
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formula for milling cutters A. number of teeth |
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formula for high speed milling with sintered carbide. A. T = number of teeth |
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formula for cutting time for turning, boring and facing |
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formula for milling machine feed rate |
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formula for estimating planer cutting speeds |
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