Tham khảo tài liệu 'illustrated sourcebook of mechanical components part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Cams 18-19 accurate specifications he has made for the cam profile. The theory of envelopes has not been employed to any extent in cam design yet it is a powerful analytical tool. The theory is illustrated here and then applied to the development of profile and cutter-coordinate equations for the six major types of cams Flat-face follower cams Swinging in-line follower Swinging off-set follower Translating follower Roller-follower cams Translating follower Translating off-set follower Swinging follower The design equations for these cams the profile and cutter-coordinate equations are in a form that accepts any profile curve such as the cycloidal or harmonic curve or any other desired input-output relationship. The cutter-coordinate equations are not a simple variation of the profile equations because the normal line at the point of tangency of the cutter and the profile does not continually pass through the cam center. We had need for accurate cutter equations in the case of a swinging flat-face follower cam. The search for the solution led us to employ the theory of envelopes. A detailed problem of this case is included to illustrate the use of the design equations which in our application provided coordinates for cutting cams to a production tolerance of in. from point to point and . total over-all deviation per cam cycle. The question will come up whether computers are necessary in solving the design equations. Computers are desirable and there are many outside services available. Calculations by hand or with a desk calculator will be time consuming. In many applications however the manual methods are worth while when judged by the accuracy obtainable. The designer will undoubtedly develop his own short cuts when applying the manual methods. Application to visual grinding The design equations offered here can also be put to good advantage in visual grinding. Magnification is limited by the definition of the work blank projected on the glass .
