Accudyne EZ-Puller Bar Puller Offers Expanded Capacity for Automation

Accudyne’s EZ-Puller expanded capacity bar puller supports larger round bar diameters of 0.093" to 2.00" and weights of up to 100 lbs. It has a hex bar capacity of 0.250" to 1.375" and square bar capacity of 0.250" to 1.000", which are pulled without an M19 (spindle orientation) function.

The bar puller is auto-adjusting, which enables automatic operation of CNC lathes. The auto adjust feature is driven by an “X” value in the pulling subroutine of a lathe program. This value represents the distance the tool needs to move in the X-axis according to the bar diameter being pulled.

The design of the EZ-Puller uses a CAM and lifter system. Hardened steel grippers are attached to hardened steel pivot arms, which have an integral CAM lobe machined at the top of the arm. As the grippers advance over the barstock, internal urethane springs are compressed. The urethane springs provide a reactive force that enables the grippers to securely hold the barstock. This design provides optimal gripping force regardless of bar size or shape, the company says.

The EZ-Puller will accommodate an infinite range of sizes without mechanical adjustment, thus enabling multiple pulls. Multiple pulls are used for longer parts that cannot be cost effectively machined in one chucking. The design also enables pulling bars with minimal projection in front of the workholding chuck. This characteristic enables the machinist to set up with as little as two gripper serrations (0.120") of engagement, which makes for a more rigid application.