tap drill - ορισμός. Τι είναι το tap drill
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Τι (ποιος) είναι tap drill - ορισμός

WIKIMEDIA LIST ARTICLE OF DRILL AND TAP SIZES
Drill chart; Drill and tap size chart
  • Schematic of a machine tap

List of drill and tap sizes         
Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to in diameter.
hammer drill         
TYPE OF DRILL
Hammerdrill; Percussion drill; Impact drill; Percussion drilling
¦ noun a power drill that delivers a rapid succession of blows.
Muster drill         
  • A muster drill in progress on the ''[[Coral Princess]]''
  • [[International Maritime Organization]] muster station sign
DRILL
Lifeboat drill; Muster station; Assembly drill
A muster drill, sometimes referred to as a lifeboat drill or a boat drill, is an exercise that is conducted by the crew of a ship prior to embarking on a voyage. A muster drill prepares passengers for safe evacuation, in the event of an emergency on board the ship, and familiarizes the crew and the passengers with escape routes.

Βικιπαίδεια

List of drill and tap sizes

Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter.

In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly. One of the most common ways to produce such threaded holes is to drill a hole of appropriate size with a drill bit and then tap it with a tap. Each standard size of female screw thread has one or several corresponding drill bit sizes that are within the range of appropriate size—slightly larger than the minor diameter of the mating male thread, but smaller than its pitch and major diameters. Such an appropriately sized drill is called a tap drill for that size of thread, because it is a correct drill to be followed by the tap. Many thread sizes have several possible tap drills, because they yield threads of varying thread depth between 50% and 100%. Usually thread depths of 60% to 75% are desired.

People frequently use a chart such as this to determine the proper tap drill for a certain thread size or the proper tap for an existing hole.