Keep machine tools clean . make sure that the handle and the positive stops are in right positions before starting machines 机床要清洁，开车前要检查手柄和行程限位挡块的位置是否正确。
2.
Other features include : preselector time control for auto cycling ; roll slide positive stop ; and automatic lubrication 其他功能包括：自动旋转时间预选控制，辊子滑动前挡板，以及自动润滑。
3.
If stock does not start against a pitch notch ( positive stop ) a start mark for first hit will be necessary 如果条料没有步距开口槽（正极停止）送进，首次冲压条料送到位置的标记是有必要的。
4.
Disc stop ? provides positive stop in open position ; positions disc to effectively function in either horizontal or vertical ( flow - up ) pipe runs 阀瓣止回-在开启位置提供积极的止回功能；位置阀瓣在水平或垂直(流向朝上)管道的功能明显。
