Thomas SvedaCharleroi, Pa. When metric threading on an English lathe, I can not use the thread dial to pick up the metric thread lead, and it is not always practical to keep the half nuts engaged at ...

Tapping screws form mating threads in materials they are driven into. There are two basic types: thread forming and thread cutting. The thread-forming screw displaced material around the pilot hole so ...

Twist drills do not make accurately sized or good finish holes; a reamer of some type is often used to cut the final size and finish. A reamer will not make the original hole; it will only enlarge a ...