General
Vari-Pak Series Introduction:
The Stelron VARI-PAK provides an integral, compact means for linear “pick and place” operations. Cam driven to handle demanding applications, the VARI-PAK is easily adapted to synchronous (continuous run) or non-synchronous (cycle on demand) applications. The VARI-PAK is available in five sizes with fixed or adjustable stroke ranges. The patented infinitely adjustable stroke range feature is unique to the STELRON VARI-PAK and makes it stand out above the rest. The VARI-PAK is available in two different standard versions; positive cam motion or spring loaded cam controlled motions. A wide variety of cam motions and sequences are available as standard.
Construction & Operation:
The VARI-PAK unit consists of an X-Y linear ball-bushing slide mounted in rugged cast aluminum housing with a projecting tool plate, to which the user attaches the necessary tooling for the application. Controlled motion of the tool plate is derived from a single steel cam (VIP) or two steel cams (SVIP), both “X” and “Y” axis have independent flame hardened cam tracks. Intermediate lever assemblies, available as either FIXED or VARIABLE type and slide yokes provide the mechanical link from cam motion to the tool plate. Removable guards enclose the internal
parts of the main housing.
Materials:
All rolling contact elements are hardened & ground for minimum wear and low friction. The yoke slider (when used) is hardened tool steel, contacting the hardened tool steel X & Y yoke members. Ball bearings, needle bearing cam followers and oscillating needle bearings are prelubricated and sealed. Linear ball bushings have felt wipers for excluding foreign matter and retaining oil lubricant. Cams are medium carbon steel flame hardened on track surfaces for long life and minimum distortion. The X-Y slide rods are high carbon steel case hardened and ground.
Size & Range:
The VIP (positive cam motion) is available in four sizes with standard strokes up to 3″ in the “Y” axis and 10″ in the “X” axis. The SVIP (spring-loaded cam controlled) is available in five sizes with standard strokes up to 6″ in the “Y” axis and 16″ in the “X” axis.
Adjustable Ranges:
The VARI-PAK is unique in providing infinite stroke adjustment within the specified range. The VARI-PAK can also be provided with a fixed, non-adjustable stroke. The fixed stroke model is available at a lower cost for any stroke up to maximum stroke of the specific unit.
Special Displacement Strokes, Cam Sequences & Stroke Ranges:
Special stroke lengths or angular sequences other than standard shown may be provided. This would incur a one time only master cam charge. VARI-PAK WORKSHEET: All orders should be accompanied with the customer worksheet. Motions should be sketched geometrically (in the space provided) relative to the example unit shown. Additionally the timing diagram should be shown sequentially with respect to the unit on the customer worksheet.