#32
【Real Cutting Video: How to Machine
a Keyway Cutting Without Live Tools】
Why finish the entire keyway operation
on a turning machine?

To address their challenge, Muratec proposed 'shaving machining using a high-speed turret feed'.
This technique is used to cut keyways on a CNC turning machine without the live tool function.
Similar to a keyway machine, it cuts by moving the tool in a piston-like motion.
You can view details in the video below.

We proposed “pre-machining positioning utilizing the C-axis torque skip function” to address their concerns.
While orientation determination is typically achieved using peripheral units or in-machine measurement tools,
it can also be accomplished simply by combining the spindle's C-axis function with a test bar.
This time, we implemented an operation where a test bar is mounted on the turret tool holder,
and load is detected via the C-axis.
As the C-axis rotates, the test bar contacts the groove side surface, causing a torque change.
This simple method calculates the angle and distance based on this change in torque.