Punch up Threading Speed


The Emuge Punch Tap is the first tool/ technology of its kind for helical thread forming in cast and wrought aluminum alloys and similar lightweight materials. Emuge Punch Taps provide a shortened tool path process for producing internal threads in under half a second, resulting in significantly less energy consumption during the machining process and a reduction in threading time by 75% compared to cold forming and conventional tapping.


Due to its extremely fast threading capabilities, high volume applications such as in the automotive industry are ideal for the Punch Tap. Emuge Punch Taps provide an excellent thread production solution for manufacturers who produce high volume parts and need to reduce cycle times.


Punch Taps are made from a special HSSE-PM alloy optimized for toughness and long wear, and have an exclusive design offering several benefits such as unique teeth geometry that produces threads in a single step. The Punch Tap features two rows of flutes off-set 180-deg. from each other and extending in a helical curve all the way down to the usable application depth. This design enables an extremely efficient tool path that is approximately 15 times shorter for a M6 thread with a depth of 15 mm compared to traditional cutting or cold-forming taps. The shortened tool path facilitates a threading process which is completed in less than half a second.


Prior to the threading operation, the tool quickly punches into a pre-drilled hole and the first tooth of each flute produces a helical groove which assists in guiding the tap to the application depth. Once the depth is reached, threading commences by cold forming with a synchronous movement of feed and rotation. The thread is produced with a half left-turn in the pitch, and each tooth of the Emuge Punch Tap produces half a thread (approximately 180-deg.). After the threads have been formed, the Punch Tap is retracted in a helical movement from the hole via the grooves. The finished cold-formed thread is interrupted by two helical grooves offset by 180-deg.


Thread strength is maintained and is comparable to conventionally machined threads from a depth of thread of 3xD. The Emuge Punch Taps, engineered and optimized for coatings and dimensions according to application requirements, are available by special order. Punch Taps are used for blind and through-holes and can be used to produce metric threads from M4 thru M8 with thread depths up to 3xD (inch sizes are also available from #8 thru 5/16). Punch Taps have internal coolant supply capability using emulsion or minimum quantity lubrication (MQL). The taps are used on modified CNC machines with a specialized Sync Control System and a Punch Tap software program.


For superior tool holding, an inclined clamping flat on the Punch Tap fits precisely with an Emuge PT-Synchro Punch Tap Holder. Force-locked rigid clamping via a cylindrical ER collet offers a high torque, highly secure solution with excellent run-out accuracy. To gage the diameter of the helical thread, an Emuge Thread Plug Gage offers go/ no-go inspection according to DIN ISO 1502.


Reinforced punch tooth

  • Production of the helical groove and material guidance prior to actual threading

Coolant / lubricant

  • Internal coolant supply (IKZ) and minimum quantity lubrication (MQL) possible

Threaded part

  • The special geometry of the teeth produces the thread in one step


  • For assembly of the tool with the tool holder in the correct position, fits the inclined clamping flat

Reinforced precision shank

  • For optimum run-out accuracy and high torque transmission

Square and inclined clamping flat

  • Pull-out protection and antirotation lock of the tool


Punch Tap-Holder (PT-Synchro)

  • The force-locked rigid clamping via a cylindrical ER collet enables a high torque, an increased clamping force as well as an excellent run-out accuracy
  •  Square integrated in holder (narrowed tolerances)
  •  Clamping screw positioned radially on inclined clamping flat serves as pull-out protection
  •  Axial adjustment screw, configurable for emulsion / oil / minimum quantity lubrication (MQL)
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