How to Tap Graphite?

Our customer tested the FlexArm on four different graphite grades: POCO3, recycled POCO3, AF5, and C200, using an Emuge 1/4-20 bottoming spiral flute tap. Graphite is a soft material requiring minimal torque, so the A-32, our smallest pneumatic model, was a perfect match for this application. For testing, the customer provided test pieces with two blind holes in each graphite grade. We used the FlexArm tapping machine and quick-change clutch tap holders to tap each piece. These tap holders feature an adjustable torque clutch that prevents tap breakage. The clutch ensures the tap stops turning upon encountering obstructions like the hole bottom. We set the clutch to a loose setting to avoid damaging the threads or material. The FlexArm tapping arm successfully tapped each graphite grade without any issues. The process produced smooth and consistent threads with no cracking or breakage. The customer was highly satisfied with the results, prompting them to purchase the A-32 pneumatic tapping machine. They plan to use it for processing approximately 60,000 parts annually. By implementing the FlexArm tapping machine, they anticipate increased efficiency and reduced scrap rate.