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codeproject vb.net barcode generator CONTACT STRESS AND WEAR: PROGRAMMING in Software
4.5 CONTACT STRESS AND WEAR: PROGRAMMING Scanning EAN13 In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. Generate European Article Number 13 In None Using Barcode drawer for Software Control to generate, create UPC  13 image in Software applications. Let us consider the general case of two cylinderlike surfaces in contact.They are represented by a cam and a follower. The radius of curvature of the follower 1 is equal to the radius of the roller Rr for the roller follower, and it goes to infinity for a flat GS1  13 Decoder In None Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications. EAN13 Encoder In C#.NET Using Barcode printer for .NET framework Control to generate, create EAN13 Supplement 5 image in .NET applications. Downloaded from Digital Engineering Library @ McGrawHill (www.digitalengineeringlibrary.com) Copyright 2004 The McGrawHill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. EAN 13 Encoder In .NET Framework Using Barcode maker for ASP.NET Control to generate, create EAN13 Supplement 5 image in ASP.NET applications. Make EAN13 In VS .NET Using Barcode creator for VS .NET Control to generate, create GS1  13 image in .NET applications. CAM MECHANISMS 4.26
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EAN / UCC  13 Creation In None Using Barcode encoder for Software Control to generate, create EAN 13 image in Software applications. GS1 128 Printer In None Using Barcode generation for Software Control to generate, create GS1 128 image in Software applications. follower. The radius of the cam s curvature 2 can be found from the following equation [compare to Eq. (4.23)]: 2 = R0 + s + s (4.36) Generate UPC A In None Using Barcode maker for Software Control to generate, create UPCA Supplement 5 image in Software applications. Painting Code 128B In None Using Barcode creator for Software Control to generate, create ANSI/AIM Code 128 image in Software applications. Equating d 2/d = s + s to zero, we can find the position of the cam, where a minimum of 2 occurs, and find its value from Eq. (4.36). Assuming perfect alignment of the contacting bodies, we have conditions described by Hertz and can check maximum compressive stress c from his wellknown equation c = 0.558 where P(1/ 1 + 1/ 2) L[(1 2 )/E1 + (1 2 )/E2] 1 2 (4.37) Identcode Maker In None Using Barcode creation for Software Control to generate, create Identcode image in Software applications. GTIN  12 Scanner In Visual Basic .NET Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications. P = normal load between cam and follower L = actual thickness of contacting follower and cam 1, 2 = Poisson s ratios for follower and cam, respectively E1, E2 = moduli of elasticity of follower and cam, respectively Decoding Barcode In Java Using Barcode decoder for Java Control to read, scan read, scan image in Java applications. EAN13 Supplement 5 Creator In None Using Barcode encoder for Font Control to generate, create EAN13 image in Font applications. Some selected data concerning properties of materials for cams and followers are given in [4.7]. Equation (4.37) may be used for finding the minimum permissible value min of the cam s profile radius of curvature. We recall that min was necessary for calculating the values of R0 and Rr from Eqs. (4.23) and (4.26), respectively. Rearranging Eq. (4.37) gives, for a roller follower, Data Matrix 2d Barcode Generator In C# Using Barcode creation for .NET Control to generate, create ECC200 image in VS .NET applications. Decode Data Matrix 2d Barcode In Visual Studio .NET Using Barcode decoder for .NET Control to read, scan read, scan image in .NET framework applications. 2 min 3.2 S c
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1 Rr
(4.38) The same equation holds true for a flatfaced follower, where 1/Rr = 0. Using Eq. (4.38), we can easily check to see if the commonly recommended and used value min = 0.25 in (6 mm) is justified in the particular design. Elements of a cam system, as well as of other machine parts, are subject to wear. The proper choice of metal combinations may increase the life of kinematic pairs of the cam system and decrease their wear. Some experience is necessary in choosing materials to fulfill the requirements of satisfactory cam action with low wear over a long period. Designers, as a rule, prefer to make the follower of softer or firstwornout material, since manufacturing of the follower is less expensive than manufacturing of the cam profile. There are, however, cases where the cam is cheaper and thus is made of softer material. 4.5.1 Programming of Cam Systems The steps shown in Fig. 4.20 are as follows: 1. Make a preliminary sketch of your cam system, and estimate the dynamic factor 2 d = me c /ke, according to Eq. (4.8). 2. If your system is a positive drive, go to step 3; otherwise go to step 4. 3. Choose a proper symmetric diagram s ( ), and write equations for s ( ), s ( ), and s( ). Write a computer program for and s( ) with increments of equal to 1 . 4. Choose a proper unsymmetric diagram s ( ), and proceed as in step 3. 5. Print table of and s( ). Downloaded from Digital Engineering Library @ McGrawHill (www.digitalengineeringlibrary.com) Copyright 2004 The McGrawHill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. CAM MECHANISMS 4.27
CAM MECHANISMS
FIGURE 4.20 Programming of cam systems.
6. If you decided to use a roller follower, go to step 7a; otherwise go to step 7b. 7. a. Establish the radius of the roller Rr and the value of maximum pressure angle max ( max 30 for the reciprocating follower and max 40 for the oscillating one). Find the value of for which s /tan max s Rr is maximum, by equating s /tan max s to zero. Calculate the value of the radius R0 of the prime circle from Eq. (4.26). Go to step 8a. b. Find the value of for which min s s is maximum, by setting (s + s ) to zero. Calculate the value of the radius R0 of the prime circle from Eq. (4.23). Calculate the face width F from Eq. (4.24). Go to step 8b. 8. a. Check undercutting of the cam profile from Eq. (4.27). b. Find the spring rate of the retaining spring. Go to step 10. 9. If the assumed value Rr is satisfactory, go to step 10; otherwise, assume a new value of Rr and return to step 7a. Downloaded from Digital Engineering Library @ McGrawHill (www.digitalengineeringlibrary.com) Copyright 2004 The McGrawHill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

