Общий каталог Yamawa 2022 - 2023 - страница 400

④ Hand Tap Series Overall length L Thread length ℓ Thread + Neck ℓn length Shank length ℓs Shank dia. Ds Size of square K Length of square ℓk JIS HT Spiral Fluted Taps (for blind hole) ① JIS Hand Taps Spiral Fluted Taps (for through hole) ② Specification Spiral Pointed Taps (for through hole) ③ Recommended Tapping Speeds depending on Materials Low carbon steels Medium carbon steels High carbon steels 低炭素鋼 中炭素鋼 高炭素鋼 5 10 〜 5 10〜 5 10 〜 Hand Taps ( m / min ) ( m / min ) ( m / min ) ④ Product Features  ●Suitable for workpiece materials where the chips are powdery or where the chips are produced as a small curl. Cemented Carbide Taps ●The cutting edge strength is high. ⑤ ●It is easy to resharpen. Working part of the cutting chamfer Roll Taps  ●The tap cuts an internal thread with the chamfer section. ⑥ ●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 k threads also have imperfect threads as shown on the right. Full Thread m a t (Please be aware that the component will not have perfect threads unless all of the chamfer e r Imcomplete Thread i portion is passed through the designated thread length.) a Special Thread Taps Simple Inspection Tools 9 Threads l ⑦ 9 Threads Difference in length of chamfer portion. 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 Pipe Taps thread chamfer portion leaves a large number of incomplete threads that must be ⑧ removed with a different tap. When tapping a through hole the full cutting Taper tap 5 Threads chamfer length can be fed through the hole to complete all the threads. 5 Threads The 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 Thread Mills Premium Thread Mills 5 Threads blind hole. The plug (middle) tap will produce 5 incomplete threads. When ⑨ 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 tap before 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 Dies ⑩ 1.5 Threads used 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 Threads process. The bottom tap can create full threads to within 1.5 threads of the Bottom tap bottom of a blind hole. Center Drills Centering Tools In the past, it was common for hand taps to be used manually in sets of three chamfer lengths (taper, plug (middle) and bottom) ⑪ 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. JIS ④-3