Question

An automatic production machine requires a com contact with a cam that rotates at a speeds up to 1800 rpm. When installed, the spring force is to vary between 150 and 600 N while the spring height varies over a rang available supply of 4.5 mm diameter shot peened wire to be used. Clash allowance (difference in spring length between maximum load and spring solid positions) is to be 2.5 pression coil spring to keep a follower in Determine appropriate values for D, N, Ls and Lo. Determine the likelihood of the spring's buckling and the likelihood of encountering spring surge. Determine the approximate factor of safety during normal operation. 1. 2. 3. Write a project report to document your work. Design notes: 1. 2. 3. Material: music wire A228; Design factor ns 1; Use Sines fatigue criterion.

Answer 1

Antues An aulimakie produc ion machive vequives Speed lhar needs rotate camedao㎜ Sping Arce any 5 and N 150 and 600 N Clash albdance =2.5 mm) 4- utuk he value& 606 50 450 calculaled farce 600 +0455600+1.5 T-112-5 N

Shear shreas (i) Gubstutiia values 2(12-5) 1T (4.5 T45 1806 a 5700 2544446.900 cttJ = 0.2.2.3 C (1.2)92 c = 8、92- calculule dkauneley D-cd -1.4 X4.5

number 어- N- dcl png Then. 353.000 (dl) ND By subshtda kvnuy Valles 563.000 (4.5) (n、44) (33.30) 1588, 500 19 550. 281 35.220 Numbev of harmonic q knou values, he 1000 19.444 . hilt ratio 4> LQ.44,

Ckr) 2y subsihuiNe values e 3 (600) (892) 42, 816 63611 613 m Minmum hear stres mm-T B subsiu Values g0 600 103950 600 2 168 mpa

agam 2000 500 0 20 50 Faclar of sater T. man 140 61.3