No need to ‘tap out’ when it comes time for threading holes

Related Vendors

HASCO Hasenclever GmbH + Co KG

Ramada Acos

YG - 1 Deutschland GmbH

Watch the torque

Torque during tapping changes from the time the first chamfer thread touches the work material and rapidly increases until the first full thread starts to cut the work material, then gradually increases until the tap stops and reverses, returning to the starting position. This causes changes in chip formation and flow and leads to unstable cutting. The chamfer threads, which act as the main cutting edges, undergo a heavier torque load and significantly impact the final thread quality.

The work material closely surrounds the tap, some materials shrink and squeeze the tap, which creates friction and therefore increases torque and machine power consumption. Some materials tend to work-harden, which expedites edge wear and increases torque and power consumption.

When tapping with spiral flute taps, contact between the chips, tool and work material creates friction and heat, which might cause size problems in materials that tend to induce the plastic deformation, softening when heated and hardening when cooled. Spiral flute taps tend to break when they reach the full depth of blind hole and stop to reverse. The tap stops while it’s still forming chips, and those chips lock the tap. To prevent breakage, the tap must push through all impediments. When supplying spiral flute taps to a short-clearance blind hole, the chamfer length must be shorter and limited. This causes the tap to undergo a heavier torque load compared to a spiral point tap, also called a gun point tap, which has longer chamfer length.

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