Expanded-capacity bar puller

Accudyne Products is introducing its expanded-capacity bar puller for CNC lathe automation. The new EZ-Puller Expanded Capacity supports larger round bar diameters of 0.093” to 2” (2.7 to 50.8 mm) and weights of up to 100 lbs (45.4 kg). Hex bar capacity of 0.25” to 1.375” (6.4 to 34.9 mm) and square bar capacity of 0.25” to 1” (6.4 to 25.4 mm) are pulled without the need for an M19 (spindle orientation) function.

The EZ-Puller is an auto-adjusting bar puller that enables the automatic operation of CNC lathes. Notably, the auto-adjust feature is driven by an ‘X’ value in the pulling sub-routine 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.

Accudyne’s patented design uses a cam and lifter system, where hardened steel grippers attach to hardened steel pivot arms. These arms have an integral cam lobe machined at their top. As the grippers advance over the bar stock, internal urethane springs compress. The urethane springs provide a reactive force that allows the grippers to securely hold the bar stock. This proprietary design provides optimal gripping force regardless of bar size or shape.

Other features of the EZ-Puller are that it will accommodate an infinite range of sizes within its capacity without mechanical adjustment, allowing for multiple pulls. Multiple pulls are used for longer parts that cannot be cost-effectively machined in one chucking. The design of the EZ-Puller also allows for pulling bars with minimal projection in front of the work-holding chuck. This characteristic allows the machinist to set-up with as little as two gripper serrations (0.12”/3 mm) of engagement, which makes for a more rigid set up.

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