Page 4 Specifications subject to change without notice or incurring obligations. “SPG”Series Parallel Grippers 7/24/97A Problem #4: Competitive grippers do not hold tolerances close enough that a replacement gripper can be installed with- out major readjustment and realignment. Solution: SPG Grippers are very precisely machined on a specially tooled 4-axis CNC machining center. Fabco-Air does 100% of the gripper manu- facturing in-house, insuring that SPG Grippers interchange perfectly with each other. SPG Gripper jaws close completely together against one another, establishing gripper centerline. The dowel pin, on which the rocker arm pivots to establish centering, serves a dual purpose. It also is the dowel that the customer uses to engage his tooling. Thus, all centerlines are one and the same!! Problem #1: Conventional grippers place the power cylinder some distance above the jaw. The jaw is driven by a "linkage" that creates a "bending moment" which results in loss of force and creates wear points for future maintenance headaches. Solution: SPG Gripper jaws are powered directly by air pressure applied to the ends of the guide shafts which act as pis- tons. Four equal pistons power the jaws inward; four equal pistons power the jaws outward. Long Term Performance SPG guide shafts are placed far apart for sturdy "play free" jaw support. Gib type de- signs have metal-to-metal sliding contact and a narrow support area that can deflect and cause play. Unique SPG Design SPG Design Conventional Gib Style Gib Style Problem #2: Many grippers have "metal on metal" sliding gib in a "T" slot. Solution: SPG Gripper jaws are guided by four stainless steel guide shafts supported by eight high-performance linear bearings. Reduced Jaw Deflection SPG Grippers have eliminated complex piston- to-jaw linkages and gibs. Bending moments are significantly reduced because force is applied directly to the jaw units at a distance very close to the gripping surface. Loss of force is minimized. Opening & closing forces are equal for use with either ID or OD gripping. Problem #3: It is difficult to attach tooling to competitive gripper jaws. Solution: SPG Grippers offer a choice of jaw styles for easy attachment of tooling. Note that all SPG Gripper jaws have three rows of tapped mounting holes and dowel holes for increased versatility. SPG Gripper jaws are available in steel or aluminum. (a) Straight Jaws (J1-Aluminum or J3- Steel) are ideal for attaching blade type gripping fingers. Here, jaws provide opposing flat mounting surfaces for inexpensive fingers with pockets used to grip rectangular parts. (b) Angle Jaws (J2-Aluminum or J4-Steel) have a slip fit dowel hole and a slip fit dowel slot, assuring precise slip fit attachment of end tooling without the expense of maintain- ing perfect dowel centerlines. Here, the J2/J4 angle jaws and easy-to-make "Vee Blocks" are used to grip cylindrical parts. (c) Interface blocks ("Option H") can be at- tached to J2/J4 angle jaws allowing tooling to be mounted on any side of the block. Below, option "H" Interface Blocks have been utilized to provide side tapped holes for mounting offset blade type gripping fingers.