Self-Adjusting Bar Pullers

April 06, 2016

Accudyne Products bar pullers, the EZ-Puller and the BigEZ, have a range of 0.093" to 1.750" and 1.625" to 3.00", respectively, and provide automatic bar stock advancement for CNC lathes.

The design of these bar pullers incorporates low-mar, close-pitch, hardened steel grippers mounted on hardened pivot arms that have integral cam lobes built into the top end of the arm. The cams compress stiff urethane springs (95A), which provide gripping force when the tool is in use. The urethane springs are captured in hardened steel lifters that move away from the pivot point, compressing the springs when actuated. 

The friction loaded grippers do not rotate while in operation, however they may be manually turned to bring up a fresh gripping surface if there is any sign of wear.

Once the tool is installed and set for spindle centerline, the programmer simply changes the “X” end value in first rapid move of the bar pulling subroutine to accommodate different bar diameters. Benefits include never having to adjust gripping arms, which results in much quicker setups and no loose parts to lose. The ability to pull hex and square stock without using spindle orientation (M19). The tool is always on center assuring more accurate pulls. Robust design and the use of hardened tool steel in all wear components equates to long life, according to the company.

Related Glossary Terms

  • computer numerical control ( CNC)

    computer numerical control ( CNC)

    Microprocessor-based controller dedicated to a machine tool that permits the creation or modification of parts. Programmed numerical control activates the machine’s servos and spindle drives and controls the various machining operations. See DNC, direct numerical control; NC, numerical control.

  • computer-aided manufacturing ( CAM)

    computer-aided manufacturing ( CAM)

    Use of computers to control machining and manufacturing processes.