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Related Concept Videos

Frictional Forces on Screws01:17

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
Self-Locking Screw01:16

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
Screw: Problem Solving01:21

Screw: Problem Solving

In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
Upward Impending Motion01:21

Upward Impending Motion

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
Wood Fasteners01:18

Wood Fasteners

In wood construction, fasteners are essential for securing components together, with the connection strength largely dependent on the direct bearing between members. Various types of fasteners are employed, each suited to specific applications and structural requirements.
Nails are the most common fasteners, consisting of sharp-pointed metal pins that are driven into wood using a hammer or a mechanical nail gun. They come in a variety of diameters, heads, and lengths. Nailing techniques include...
Steel Fastening Techniques01:17

Steel Fastening Techniques

Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
Bolting is another...

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[Screw-in performance of threaded cups].

H Effenberger1, O Bösl, U Witzel

  • 1Orthopädische Universitätsklinik und Poliklinik Friedrichsheim, Frankfurt a. M. effenberger@implantat-atlas.com

Zeitschrift Fur Orthopadie Und Unfallchirurgie
|April 12, 2008
PubMed
Summary
This summary is machine-generated.

Modified trapezoid threads offer the best screw-in performance for medical implants, providing easier insertion and better control. Flat threads also show good performance, while sharp threads are difficult to insert and control.

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Area of Science:

  • Orthopedic implant design
  • Biomaterials engineering
  • Surgical instrumentation

Background:

  • Threaded cup design significantly impacts screw-in performance in implants.
  • Variations in standard implant designs hinder comparative analysis of insertion parameters.

Purpose of the Study:

  • To evaluate the effect of thread design, cup size, and shape on implant screw-in performance.
  • To identify optimal thread geometries for improved insertion characteristics.

Main Methods:

  • Manufactured 15 prototype cups with varying sizes, shapes, and thread designs.
  • Tested screw-in performance on artificial bone, measuring insertion torque, angle, and seating point characteristics.

Main Results:

  • Modified trapezoid threads exhibited lowest insertion resistance and clearest seating point indication.
  • Flat threads demonstrated lower resistance than sharp threads, with more pronounced seating slopes.
  • Larger cup diameters resulted in higher insertion resistance.

Conclusions:

  • Thread design is a critical factor in screw-in performance.
  • Modified trapezoid threads facilitate easier insertion and enhanced manual control, reducing risks.
  • Flat threads offer low insertion resistance, while sharp threads present challenges in detecting the seating point.