Общий каталог Yamawa 2022 - 2023 - страница 400

Предыдущая страница Следующая страница

Навигация

JIS HT

Hand Taps

Specification

Recommended Tapping Speeds depending on Materials

Low carbon steelsMedium carbon steelsHigh carbon steels
5低炭素鋼105中炭素鋼105高炭素鋼10
(m/min)( m/ min)(m/min)

Product Features ●Suitable for workpiece materials where the chips are powdery or where the chips are produced as a small curl. ●The cutting edge strength is high. ●It is easy to resharpen.

Working part of the cutting chamfer ●The tap cuts an internal thread with the chamfer section.

  • The chamfer section is tapered towards the tip to facilitate cutting into a prepared hole.

Internal Thread

  • Since the cutting chamfer portion of the tap has incomplete threads, the tapped internal W

o r

threads also have imperfect threads as shown on the right. k Full Thread

m a (Please be aware that the component will not have perfect threads unless all of the chamfer t e

r i Imcomplete Thread portion is passed through the designated thread length.)9 Threads a l Difference in length of chamfer portion.9 Threads

9 Threads The cutting chamfer length of the taper tap is 9 threads long. The taper tap is
used first because the long chamfer gradually cuts the full thread height easily
with a small metal removal per thread pitch. However, in blind holes, the nine
thread chamfer portion leaves a large number of incomplete threads that must be
removed with a different tap. When tapping a through hole the full cutting
Taper tapchamfer length can be fed through the hole to complete all the threads.
5 Threads
5 ThreadsThe cutting chamfer length of a plug (middle) tap is 5 threads long. The plug
(middle) tap is used after a taper tap to lengthen the number of full threads in a
5 Threadsblind hole. The plug (middle) tap will produce 5 incomplete threads. When
tapping a blind hole, the taps are used in the order of a taper tap → a plug
(middle) tap and → a bottom tap. The plug tap is used after the taper tap and
Plug tapbefore the bottom tap. The plug tap can be used as a starter tap if necessary.

1.5 Threads The cutting chamfer length of a bottom tap is 1.5 threads long. The bottom tap is

1.5 Threadsused after the plug (middle) tap to lengthen the number of full threads in a blind
hole. The bottom tap is difficult to use manually to start the thread cutting
1.5 Threadsprocess. The bottom tap can create full threads to within 1.5 threads of the

bottom of a blind hole. Bottom tap In the past, it was common for hand taps to be used manually in sets of three chamfer lengths (taper, plug (middle) and bottom) for the same diameter and pitch thread. Today, most methods of thread processing on tapping machines, drilling machines, CNC

machines and special machines allow for the use of just one type of tap chamfer length to be used that best suits the components requirements. This saves time while producing quality threads with just one tap. Therefore, due to the decrease in demands for the taper tap, YAMAWA stopped production of taper taps in March 2013.