Linear Slides

Specifications subject to change without notice or incurring obligations Page 4 F abco-Air offers a wide assortment of linear slides, each suited to a vast variety of applications. But how does one know which slide to select? This section of the catalog will guide you through the selection process by providing useful information and helpful hints. Selecting a linear slide involves five factors Factor 1: Bore size of cylinder (determines power factor and linear thrust) Factor 2: Guide Shaft Diameter (determines slide's load capacity) Factor 3: Stroke (select from standard available strokes, or Fabco-Air can provide special stroke lengths) Factor 4: Bearing Type and Guide Shaft material (linear ball bearing or sleeve type bearing; guide shaft material is matched to bearing type and application environment) Factor 5: Selection of slide series (determines physical layout of the cylinder, bearings, guide shafts, toolbar/ toolplate) Factors 1 through 3 – Bore, Guide Shaft Size & Stroke In this catalog, each slide series is detailed in its own section. Engineering information can be found at the beginning of each section, detailing cylinder bore size, guide shaft size, and standard strokes, as well as loading information listing how much load can be supported at a given stroke and what amount of shaft deflection can be expected. Refer to this data to determine correct model size required for your application. FABCO-AIR Linear Slides 1-4--99 Factor 4 – Bearings & Guide Shafts Linear ball bearings vs. sleeve type bearings. . . Linear ball bearings provide three major benefits: 1. Precision and accuracy - linear ball bearings can operate with little or no “play”, providing precise, repeatable motion. 2. Smooth, low friction motion - linear ball bearings can handle even severe overhung loads without sticking or binding. Rolling elements mean no sliding friction. 3. Long life - reduced friction provides long service life, especially on long strokes with high loads. Sleeve type bearings – Duralon ® or Rulon ® 1. Sleeve bearings work best when used to support “carriage” type loads (where load is applied equally to the four bearings) 2. Sleeve bearings can handle moderate overhung loading. Heavy overhung loads can cause bearing to wear “egg-shaped”. 3. Sleeve bearings must have running clearance between I.D. and guide shaft. Therefore, some “play” will be exhibited at the toolbar. The closer the bearing-to-bearing spacing and/or the longer the stroke, the more free play motion at the toolbar. Helpful bearing selection hints • Long stroke, high speed applications are best handled by linear ball bearings. • Short stroke, high cycle rate applications are best handled by Sleeve Type bearings. (example: 1" stroke @ 200 cycles per minute). Short, fast reciprocating motion can shorten the life of linear ball bearings and/or guide shafts because the inertia of the ball circuit causes “skidding” when direction is rapidly reversed.