Servo Threading Attachment

The Servo Driven Threading Attachment is designed to thread parts (tap ID or thread OD) at an infinite number of speeds (up to 6000 RPM in 1 RPM increments). The attachment control is integral to the Davenport HP control. The programmable controller commands the servo motor drive speeds and shifting points, allowing for shifting from low to high speed at any point during the work cycle when tapping. The attachment drives the 3rd and/or 4th position tool spindles at a programmed speed. The spindles can be used for turning operations, such as threading, drilling, reaming, broaching, etc. While threading has a unique motion profile related to the thread pitch, turning has simple, one- speed motion. Combinations of operations possible with this attachment: threading in both 3rd and 4th positions, turning in 3rd and threading in 4th (or vice versa) or turning in both 3rd and 4th positions. If a stationary tool spindle is required, a locking device holds the spindle from rotating, with the driven gear completely disengaged from the driving gear. The work spindle can be either revolving or stopped (with spindle stop clutches). Since the speed and shifting point of the tool spindle are controlled with the servo motor and motion controller, the rotating spindle motion becomes the variable in tooling applications, eliminating two main adjustments required with the traditional mechanical threading attachment. With Servo threading, the precise speed change shifting point (determined by cam design) is programmed into the control. The speed at which the tap enters and leaves the work piece is calculated and entered in the control as a specific RPM. With the traditional method, cam lever block location and shifting cam position had to be manually adjusted to achieve proper lead and shifting point. With the programmable features of this attachment, a large range of pitch threads is attainable with a small range of cam profiles. Since the threading speed is calculable, one simply determines if the surface speed of the tool is within the recommended limitations for the specified material. Web utility and/or modem connection allows monitoring and diagnostic capabilities to the PLC from a remote location.