đến cho chúng ta những gì
Text Book of Machine Design P29
... = 1.6 Q = V R + + We know that tan φN = tan φ cos α = tan 20° × cos 45° = 0.2573 ∴ φN = 14.4° WT = * T = The tangential tooth load on the pinion may also be obtained by using the relation, WT ... plane of rotation The relation between the normal pressure angle (φN) in the normal plane and the pressure angle (φ) in the diametral plane (or plane of rotation) is given by tan φN = tan φ × cos ... pitch ∴ Overlap = b tan α = 1.15 pc 1.15 pc 1.15 × π m (∵ pc = π m) = tan α tan α or b = where b = Minimum face width, and m = Module Notes : The maximum face width may be taken as 12.5 m to...
- 14
- 1,045
- 0
Text Book of Machine Design P30
... D T N θP1 = tan–1 = tan–1 P = tan–1 P = tan–1 G V.R DG TG NP and θP2 DG TG TP = tan–1 (V.R.) = tan–1 D = tan–1 = tan–1 N P ... throughout by cos θP1 we get V.R tan θP1 = sin θS – cos θS tan θP1 sin θS or tan θP1 = V.R + cos θS sin θS θP1 = tan–1 V R + cos θS Similarly, we can find that ∴ tan θP2 = ∴ .(i) .(ii) .(iii) ... angle for the pinion, The face width may be taken as −1 θP1 = tan–1 = tan V R and pitch angle for the gear, θP2 = 90º – 33º = 57º −1 = tan (0.65) = 33º 1.538 1090 n A Textbook...
- 21
- 449
- 0
Text Book of Machine Design P31
... Efficiency, η = tan λ (1 – µ tan λ) tan λ + µ = − µ tan λ + µ / tan λ = tan λ tan (λ + φ1 ) .(Substituting in equation (i), φ = 0, for square threads) where φ1 = Angle of friction, such that tan φ1 = ... We know that efficiency of the worm drive, or η = tan λ (cos φ − µ tan λ ) cos φ tan λ + µ = tan 15.5° (cos 20° − 0.10 × tan 15.5°) cos 20° × tan 15.5° + 0.10 = 0.277 (0.9397 − 0.10 × 0.277) ... that tan λ = m.n 6×3 = = 0.277 65 DW λ = tan–1 (0.277) = 15.5° ∴ Axial thrust on the worm, WA = WT / tan λ = 2203 / 0.277 = 7953 N Ans and separating force on the worm WR = WA tan φ = 7953 × tan...
- 24
- 384
- 0
Tài liệu Text Book of Machine Design P1 docx
... fundamental units and two supplementary units, which cover the entire field of science and engineering These units are shown in Table 1.1 supplementary units Table 1.1 Fundamental and supplementar ... levels of the ground state of the caesium – 133 atom Presenta esentation 1.12 Presentation of Units and their Values The frequent changes in the present day life are facilitated by an international ... Use of standard parts The use of standard parts is closely related to cost, because the cost of standard or stock parts is only a fraction of the cost of similar parts made to order The standard...
- 15
- 543
- 0
Tài liệu Text Book of Machine Design P2 docx
... Machine Design standard designation Composition in percentages n Indian 38 standard designation alloy heat resisting Table 2.9 Indian standard designation of high alloy steels (stainless steel ... (d) spheroidising 13 The metal suitable for bearings subjected to heavy loads is (a) silicon bronze (b) white metal (c) monel metal (d) phosphor bronze 14 The metal suitable for bearings subjected ... on an average) manganese Table 2.6 shows the Indian standard designation of carbon steel with composition and their uses standard designation according Table 2.6 Indian standard designation of...
- 37
- 388
- 0
Tài liệu Text Book of Machine Design P3 pptx
... use The hot working of metals has the following advantages and disadvantages : Advantages The porosity of the metal is largely eliminated The grain structure of the metal is refined The impurities ... Design The fundamental deviation for Indian standard shafts for diameter steps from to 200 mm may be taken directly from Table 3.10 (page 76) Table 3.7 Formulae for fundamental shaft deviations ... grades in question The fundamental deviation for Indian standard holes for diameter steps from to 200 mm may be taken directly from the following table Table 3.9 Indian standard ‘H’ Hole Limits for...
- 34
- 564
- 0
Tài liệu Text Book of Machine Design P4 ppt
... area = A – a A−a × 100 and percentage reduction in area = A Percentage elongation It is the percentage increase in the standard gauge length (i.e original length) obtained by measuring the fractured ... maximum instantaneous stress and the elongation Take E = 200 GN/m2 Solution Given : d = 50 mm ; l = 2.5 m = 2500 mm ; U = 100 N-m = 100 × 103 N-mm ; E = 200 GN/m = 200 × 10 N/mm Maximum instantaneous ... experimentally that when a body is stressed within elastic limit, the lateral strain bears a constant ratio to the linear strain, Mathematically, Lateral strain = Constant Linear strain This constant...
- 33
- 427
- 0
Tài liệu Text Book of Machine Design P5 ppt
... algebraically to the bending stress, in order to obtain the resultant stress on the section In other words, σbi = Resultant stress, σ = σd ± σb The following table shows the values of Rn and R for various ... then the distance of the extreme fibres for Parts in a machine both lower and upper side of the section is obtained Out of these two values, the bigger value is used in bending equation Table 5.1 ... product of the tangential load and the radius of the pulley, therefore tangential load acting on the pulley T 238 × 103 = = 396.7 N 600 R Since the pulley has four arms, therefore tangential load...
- 61
- 555
- 0
Tài liệu Text Book of Machine Design P6 docx
... binder blend in a powerful mixer called a disperser added Bead mill Holding tank Disperser Mixing tank Setting tank Filter tank Pigment and paint thinner added Final adjustments made Note : This ... the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to (a) static load (b) dynamic load (c) static as well as dynamic load ... factor for non-ferrous metals may be taken as unity Effect Factor 6.6 Effect of Size on Endurance Limit—Size Factor A little consideration will show that if the size of the standard specimen as shown...
- 43
- 417
- 0
Tài liệu Text Book of Machine Design P7 pdf
... 7.4, utilises a spherical pressure tank ‘A’ connected to a working cylinder B The pump maintains a pressure of N/mm2 in the tank If the diameter of pressure tank is 800 mm, determine its thickness ... + !t6 or ce' – cd or cc' Resultant stress at the inner surface of the outer cylinder = !t3 + !t6 or ce + ce' or c'e'' )Total resultant stress at the mating or contact surface, !tm = !t2 + !t6 ... Textbook of Machine Design Tangential stresses at the inner, middle and outer surfaces We know that the tangential stress at any radius x, ( ro ) 41 ∃ ( ro ) – ( ri ) x ) Tangential stress at the...
- 37
- 506
- 1
Tài liệu Text Book of Machine Design P8 ppt
... obtained by the above relation is too small Therefore for the design of pipes, a certain constant is added to the above relation Now the relation may be written as p.D ∃C !t The value of constant ... according to Weisback, are given in the following table t = Table 8.2 Values of constant ‘C’ Material Cast iron Mild steel Zinc and Copper Lead Constant (C) in mm 266 n A Textbook of Machine Design ... pipe may be fixed from standard tables In practice, dimensions are not calculated on a rational basis The standards are evolved on the basis of long practical experience, suitability and interchangeability...
- 20
- 381
- 0
Tài liệu Text Book of Machine Design P9 doc
... tearing resistance of the plates (Pta), 75 000 = ( p – d ) t × !ta = (75 – 25)15 × !ta = 750 !ta ∀ !ta = 75 000 / 750 = 100 N/mm2 = 100 MPa Ans Actual shearing resistance of the rivets (Psa), ∃ ∃ ... of rivets as obtained by equating the tearing resistance to the shearing resistance is more than pmax, then the value of pmax is taken Distance between the rows of rivets The distance between ... let us find the tearing resistance of the plate, shearing resistance and crushing resistance of the rivet (i) Tearing resistance of the plate We know that tearing resistance of the plate per pitch...
- 60
- 388
- 0
Tài liệu Text Book of Machine Design P10 docx
... Advantages and Disadvantages of Welded Joints over Riveted Joints Advantages Disadvantages ov Riveted Following are the advantages and disadvantages of welded joints over riveted joints Advantages ... welding does not require the metal metal to be preheated and since the temperature of the Base metal arc is quite high, therefore the fusion of the metal is almost instantaneous There are two kinds ... on drawing are shown in the following table Representa esentation welding symbols Table 10.3 Representation of welding symbols S No Desired weld Representation on drawing Fillet-weld each side...
- 36
- 435
- 1
Tài liệu Text Book of Machine Design P11 doc
... predetermined relative motion 11.2 Advantages and Disadvantages of Screwed Joints Following are the advantages and disadvantages of the screwed joints Advantages Screwed joints are highly reliable ... resultant load is equal to the sum of the initial tension and the external load For hard gaskets or metal to metal contact surfaces and with small bolts, the value of a is small and the resultant ... Girder stays These stays are placed edgewise on the plate to be supported and bolted to it at intervals Fig 11.28 Boiler stays Here we are mainly concerned with the direct stays The direct stays...
- 54
- 375
- 0
Tài liệu Text Book of Machine Design P12 doc
... dp P tan (: ;) T dp ∃ d p P tan (: ;) ∃ ∃ ∀ = # 2 J # (d p )2 (d p )4 32 P tan : tan ; = # (d p )2 , tan : ∃ tan ; The usual values of tan :, tan ; and dp are as follows : tan : = 0.03, tan ; ... of the tapered portion of the piston rod (L) is taken as 2.2 d2 The diameter of the parallel part of the piston rod (d) and diameter of the piston rod at the tapered end (d1) may be obtained ... follows : − 452 n A Textbook of Machine Design d = d2 L L ∃ taper ; and d1 = d2 – ∃ taper 2 Note: The taper on the piston rod is usually taken as in 20 Example 12.5 Design a cotter joint to connect...
- 39
- 355
- 0
Tài liệu Text Book of Machine Design P15 ppt
... Design for tappet screw The adjustable tappet screw carries a compressive load of 5000 N Assuming the screw is made of mild steel for which the allowable compressive stress (∋c) may be taken as ... attached by a fulcrum pin at R and to a horizontal rod at Q An operating force of 700 N is applied horizontally at P The distance of the horizontal rod Q from the fulcrum pin R is 140 mm If the ... 103 or D = 26.5 mm Taking larger of the two values, we have D = 26.5 mm Ans Example 15.2 A vertical lever PQR, 15 mm thick is attached by a fulcrum pin at R and to a horizontal rod at Q, as shown...
- 42
- 470
- 0
Tài liệu Text Book of Machine Design P16 ppt
... and C = Constant, representing the end conditions of the column or end fixity coefficient The following table shows the values of end fixity coefficient (C ) for various end conditions Table 16.1 ... constant = , ! E Columns and Struts n 607 L = Equivalent length of the column, and k = Least radius of gyration The following table gives the values of crushing stress and Rankine’s constant ... to a compressive stress If the load is gradually increased, the column will reach a stage, when it will start buckling The load, at Depending on the end conditions, different columns which the...
- 24
- 425
- 0
Tài liệu Text Book of Machine Design P17 docx
... or !%; # & Efficiency for self locking screws, 7; tan # tan # tan # (1 ) tan #) tan # ; ; ; ) tan (# ∋ #) tan # tan # 2 tan # 3∵ tan 2# ∗ ) tan # From this expression we see that efficiency of ... W tan (!1 ∋ #1 ) ∗ W − / ) tan !1 tan #1 Similarly, torque required to overcome friction at the lower screw, d + tan ! ∋ tan #2 , d (ii) T2 = W tan ( ! ∋ #2 ) ∗ W − /1 ) tan ! tan # 2 & Total ... efficiency of the screw, tan ! tan ! (1 ) tan ! tan #) %%%%%7 = tan (! ∋ #) ∗ tan ! ∋ tan # 0.0637 (1 ) 0.0637 ( 0.08) ∗ 0.441 or 44.1% = Ans 0.0637 ∋ 0.08 When the load does not rotate with the screw...
- 53
- 407
- 0
Tài liệu Text Book of Machine Design P18 pptx
... Rubber 0.30 0.18 — 0.32 0.35 0.40 0.42 Balata 0.32 0.20 — 0.35 0.38 0.40 0.42 18.10 Standard Belt Thicknesses and Widths Standard Thicknesses The standard flat belt thicknesses are 5, 6.5, 8, ... of 250 to 600 mm The standard values of nominal belt widths are in R10 series, starting from 25 mm upto 63 mm and in R 20 series starting from 71 mm up to 600 mm Thus, the standard widths will ... belt is tightened up At this stage, even when the pulleys are stationary, the belt is subjected to some tension, called initial tension When the driver starts rotating, it pulls the belt from...
- 38
- 598
- 0
Tài liệu Text Book of Machine Design P19 docx
... of different sizes The following table shows the number of spokes and their sizes according to Indian Standards, IS : 1691 – 1980 (Reaffirmed 1990) Table 19.1 Standard number of spokes and their ... or have adjustable bushings which prevents relative rotation between them and the shaft by the frictional resistance set up These pulleys are used for motor drives in which the contact arc between ... (Part I) – 1973 (Reaffirmed 1990), the width of pulley is fixed as given in the following table : Table 19.2 Standard width of pulley Belt width in mm Width of pulley to be greater than belt width...
- 12
- 397
- 0
Tìm thêm: hệ việt nam nhật bản và sức hấp dẫn của tiếng nhật tại việt nam xác định các nguyên tắc biên soạn khảo sát chương trình đào tạo gắn với các giáo trình cụ thể tiến hành xây dựng chương trình đào tạo dành cho đối tượng không chuyên ngữ tại việt nam điều tra đối với đối tượng giảng viên và đối tượng quản lí điều tra với đối tượng sinh viên học tiếng nhật không chuyên ngữ1 khảo sát thực tế giảng dạy tiếng nhật không chuyên ngữ tại việt nam khảo sát các chương trình đào tạo theo những bộ giáo trình tiêu biểu xác định mức độ đáp ứng về văn hoá và chuyên môn trong ct phát huy những thành tựu công nghệ mới nhất được áp dụng vào công tác dạy và học ngoại ngữ mở máy động cơ lồng sóc các đặc tính của động cơ điện không đồng bộ đặc tuyến hiệu suất h fi p2 đặc tuyến mômen quay m fi p2 đặc tuyến tốc độ rôto n fi p2 đặc tuyến dòng điện stato i1 fi p2 sự cần thiết phải đầu tư xây dựng nhà máy thông tin liên lạc và các dịch vụ chỉ tiêu chất lượng theo chất lượng phẩm chất sản phẩm khô từ gạo của bộ y tế năm 2008 chỉ tiêu chất lượng 9 tr 25