要清楚 负载的大小 2 z' _1 Q& G A/ A; j
and then choose an actuator or pistion * ~. x% k* L+ z" L, D2 y) l! ?8 K; p) }- q( c
establish the flow and pressure profile " }& F; d8 @/ ]; M. N * K6 j- g/ O* e# V8 P9 \find out the horsepower you need 8 K L: k C2 N9 a% m2 X
& b+ d+ S+ F4 A1 i0 O0 l
be careful about the acceleration and deceleration period $ i5 D8 ^1 I! ~0 o W 9 d! G# N6 c9 \4 l- s- A6 r1 ]# gquite agree with #2