2.2 CLAMPING KNOBS WITH THREADED INSERTS (TYPES OF ASSEMBLY)
Types of assembly that create optimum clamping conditions
The plastic base on the clamping knob should never rest on the clamping surface. In this way the metal inserts (threaded stud or tapped boss) are never subjected to abnormal twisting ('corkscrew' effect) when axial tensile stress is applied. Thus, the anchoring of the metal insert to the plastic material is stressed in the correct way, that's to say it is only subject to the torque applied to the knob for tightening it.
Incorrect types of assembly
When the plastic base of the clamping knob rests directly on the clamping surface, the threaded stud or tapped boss are also subject to an axial load ('corkscrew' effect), which could jeopardize its anchoring to the plastic material. The values of this force are always higher, with a broad safety margin, than those that may be applied by normal operations performed by hand, but designers who wish to take into account cases of improper use should avoid the situations illustrated in cases 5-6-7.
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Generals
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1. Plastic materials
- 1.1 Mechanical strength
- 1.2 Thermal resistance
- 1.3 Strength and surface hardness
- 1.4 Resistance to chemical agents
- 1.5 Resistance to atmospheric agents and uv rays
- 1.6 Flame resistance
- 1.7 Electrical properties
- 1.8 Surface finish and cleanability
- 1.9 Compliance with international standards
- 1.10 Competence of Elesa+Ganter technical department
- 2. Metal materials
- 3. Other materials
- 4. Machining tolerances
- 5. Fixed handles
- 6. Assembly measures
- 7. Special executions
- 8. Colours
- 9. Test values
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10. Technical tables
- 10.1 Conversion tables
- 10.2 DIN 79 Square holes and shafts
- 10.3 DIN 6885 Keyways
- 10.4 GN 110 and GN 110.1 Transversal holes
- 10.5 DIN 13 ISO Metric threads
- 10.6 DIN 228 Cylindrical GAS-BSP threads
- 10.7 DIN EN ISO 898-1 | DIN EN 20898-2 Strenght values
- 10.8 DIN ISO 286 ISO-Fundamental tolerances
- 10.9 IP Protection Classification
- 10.10.1 PFB | PRB Thread locking with jamming action Polyamide patch coating/ Polyamide complete coating
- 10.10.2 MVK Thread locking gluing Micro encapsulation precote 80 (red)
- 10.11 Stainless Steel characteristics
- 10.12 Surface treatments
- 10.13 Carbon steel, zinc alloys, aluminium, brass characteristics
- 10.14.1 Duroplast, elastomer, technopolymer and rubber characteristics
- 10.14.2 Duroplast, elastomer, technopolymer and rubber characteristics
- 10.14.3 Duroplast, elastomer, technopolymer and rubber characteristics
- 10.15 Load ratings U-Handles
- 10.16 Load ratings metal hinges
- 10.17 Strength of indexing plungers
- 10.18 Assembly sets GN 965 and GN 968
- 11. Vibration-damping elements
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1. Plastic materials
- Hygienic design
- Operating Elements
- Clamping knobs
- Control elements
- Rotary controls
- Indexing elements
- Joints
- Transmission elements
- Levelling elements
- Hinges
- Latches
- Toggle, power and hook clamps
- Accessories for hydraulic systems
- Tube clamp connectors
- Castors and wheels
- Magnets
- Conveyor components
- Linear slides
- Vibration mounts
- Vacuum components
- Elastomer springs