|
各位大侠:7 o2 ?0 }, v' p/ Y5 Y* D9 `, @8 l
这个 “knockouts”是什么东东?见过的同学放张图片上来看看。% d) V* `# L* A8 [& A. g
41 Tests on knockouts1 Z, I6 h/ A$ A8 y; q
41.1 A force of 10 lbs (4.5 kg) shall be applied to a knockout for 1 minute by means of a 1/4 in (6.4 mm): a- D4 v Y6 k3 N& d9 z; O( }7 @# a7 {
diameter mandrel with a flat end. The force is to be applied in a direction perpendicular to the plane of the, K7 z; |# A! y
knockout and at the point causing movement. The knockout shall remain in place and the clearance7 a/ U" R1 r W$ R% T1 o1 g
between the knockout and the opening shall be no more than 0.063 in (1.6 mm) measured after the force8 u0 d6 O! x- J" g$ O2 {* v
has been removed.
) O# h2 [4 _- j% t& s V0 K6 U: M* Z9 [9 y: M* a4 i1 w( F2 e' [$ ?% I4 c0 I
谢谢!
( A7 b: A3 t4 j* X, j, _$ D6 Z |
|