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| 1. Ball Slide Or Roller Slide Type Linear Bearing: |
Ball slide design advantages:
• Self cleaning (point contact of balls and shafts does not allow foreign material to interfere).
• Low cost (Ball and shaft materials are common and easily manufactured)
Crossed roller slide design advantages:
• Line contact of roller to shafts offer 8x10 times the load capacity of balls.
• Higher over hanging load capacity and low axial play.
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| 2. Straight Line Design or Recirculating Type: |
Straight-line, or non-recirculating linear bearings, have rolling elements which move on a straight track and are separated by a retainer. This type of linear bearing reaches the end of its travel when the retainer or rolling element contacts a limiting component, (either a screw head or end cap). This travel limitation is determined by the relationship of the retainer length to the carriage length. Standard linear bearings usually have travel equal to 1/3 the carriage length. Maximum total travel can be as much as 1 X the carriage length. Therefore, for more travel you must specify a longer slide. This design offers extremely low friction and stiction characteristics.
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| Travel ends when the ball or roller retainer contacts the end cap. |
Balls recirculate around an oval track. Travel is limited by the length of the base rail. |
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| 3. Standard Tolerances |
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| Dimensions in Inches* |
Dimensions in Millimeters* |
Two (2) place decimals: ±.010
Three(3) place decimals: ±.005 |
one (1) place decimals: ±0.25
Two (2) place decimals: ±0.13 |
| *Unless otherwise specified |
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| 4. Custom Slides and linear bearings |
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Del-Tron's engineering staff will be pleased to assist you in developing custom versions of our linear slides. Our proprietary manufacturing processes allow us to offer completely customized slides built to your requirements even in small quantities in less than eight weeks.
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• Changes in height, width, or length
• More or less travel
• Increased load capacity
• Light, Medium, or heavy preload
• Different holes, threads or hole locations
• Dowel holes and pins
• Reduced or increased axial play
• Multiple carriages on a single base
• Non-standard retainer material
• No anodize or non-standard anodize color
• Corrosion resistant stainless steel components
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5 High Temperature Applications:
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Del-Tron slides can be modified to operate in elevated temperature areas by the substitution of teflon, aluminum, or brass retainers.
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| 6 Static Sensitive Applications |
Del-Tron now offers precision linear motion devices that meet low electrostatic discharge requirements common in the semiconductor and electronics industries. The new linear bearings are coated with electroless nickel, an alloy of nickel and phosphorous produced by autocatalytic chemical reduction with hypophosphite. The plating allows static charges to dissipate, helping the slides to meet requirements for automated equipment. Del-Tron's "ESD" electroless nickel plated linear bearings are plated to ASTM standard B 733-97. This process is available for Del-Tron's line of ball slides, crossed roller slides and both ball and crossed roller multi-axis positioning stages.
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| 7 Vacuum Applications |
Outgassing of slide components can be reduced or eliminated for vacuum applications by eliminating anodized and oxided finishes, labels, lubricants, and non-metallic retainers.
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| 8 Preload vs. Axial Play |
Many of our linear bearings are built to allow the preload to be set to a specific amount to accommodate the needs of the application. A light, medium, or heavy preload may be ordered. The amount of preload can expressed as grams of force needed to move either the base or carriage. Please contact our engineering staff to discuss your special preload requirements.
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| Slide preload and axial play are related.
• Increased preload = less axial play
• Decreased preload = more axial play |
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9 Straight Line Accuracy
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| Straight Line Accuracy = possible runout in any plane |
H = Horizontal Displacement
V = Vertical Displacement |
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| Del-Tron Precision began operations in 1974 supplying original equipment manufacturers with the world’s first commercially available subminiature linear bearings. Since then, thousands of Del-Tron ball slides have been incorporated into medical analyzing and testing machines, semiconductor processing equipment, computer peripherals, assembly systems, scientific instruments and many other machines. Del-Tron’s modern corporate campus boasts highly automated computer controlled equipment and final inspection of 100% of all products has been Del-Tron’s policy since its inception. For more information, contact Del-Tron by phone at 800-245-5013, by fax at 203-778-2721 or by email: deltron@deltron.com. |
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