Drill and Tap for 5/16-24 NC

Drill and Tap for 5/16-24 NC tap drill 一个孔的地方标着 DRILL AND TAP FOR #6-32 UNC,13.5MM DEEP 谁知道是什么意思 图纸上标注drill & tap for 3/8-16 4 places. Φdrill and tap to 3/8 unf 就是这个了 Drill and ream for 3/8S F .dowel是什么意思? 请问 drill 3/4 thru,tap 1/2 bspp thru tap and hold the trianyle for 2 seconds是什么意思 求翻译 techniques and materials for teaching ,drill design,and music arranging tap and hold是什么意思 drill thru #7(.201dia) ＆tap 1/4-20NC(2HOLES)是什么意思? 英语翻译Multiple-edged tools can also be used.Drilling uses a twin-edged fluted tool for holes with depths up to 5 to 10 times the drill diameter.Whether the drill tyrns or the workpiece rotates,relative motion between the cutting edge and the wo practice and drill这句话是什么意思? tap tap tap X .375 MIN FULL THREAD TAP DRILL 英英制图纸#8-32 UNC-2B X .375 MIN FULL THREAD TAP DRILL DEPTH.500+-.030(4.REQD) (2 EACH SIDE)的意思 英语翻译Claim:What is claimed is:1.A locking device to screw and to unscrew elements having threaded couplings and belonging to a drill stem,said device being suitable for use in drill rigs comprising arotating head suitable to make said drill st