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Encyclopedia > Acme thread form

Threads formed around a shaft are used to translate rotational motion into linear motion. In this way fasteners such as screws and bolts convert the rotational motion or torque of a screwdriver or wrench into a compressional holding force. Threads around a shaft are also used to move or position mechanical components such as a tool post on a metal-working lathe, or to raise or lower a garage door.


The most common profile for threads is a V-form; the threads, if sliced parallel to the shaft would describe a series of V's, representing the apex of the threads and the valleys between them. In some applications in which the screw is used to exert a great deal of force, the size of the threads is inadequate to prevent them from being sheared off of either the shaft or the bore into which they are threaded. Jack screws for moving large structures, bench vises and C-clamps are common examples of this type of screw application.


Square threads were developed to address this issue. Threads are cut with a square profile, with a zero degree pitch which provides a stronger, more robust bearing shoulder for the rotating shaft. However, square threads are more difficult to machine and are difficult to thread. The Acme thread was developed to offer better characteristics and to overcome these problems with the square thread form.


The Acme thread form uses a 29 degree pitch with flat apex and valley. The Acme screw thread is stronger than V-profile 60 degree threads. Wear can be compensated for with a "split nut". Typically found where large loads or accuracy is required as in vises or the lead screw of a lathe. Screw thread, used to convert torque into the linear force in the flood gate. ... A vise (or vice) is a mechanical screw apparatus used for holding or clamping a workpiece to allow work to be performed on it with other tools, such as saws, planes, drills, mills, screwdrivers, sandpaper, Without qualification, vise usually refers to a bench vise with flat, parallel jaws, attached to... Conventional metalworking lathe In woodturning, metalworking, metal spinning, and glassworking, a lathe is a machine tool which spins a block of material so that when abrasive, cutting, or deformation tools are applied to the block, it can be shaped to produce an object which has rotational symmetry about an axis...


External links

  • Threaded Fasteners
  • Screw Thread Forms
  • International Thread Standards
  • Comparision with other power threads
  • Drawing of an Acme thread
  • Trapezoidal coarse thread
  • Trapezoidal fine thread



Metalworking:

 Drilling and threading: Image File history File links Blacksmith-hammer-anvil-50x50. ... Turned chess pieces Metalworking is the craft and practice of working with metals to create parts or structures. ...

Die head | Drill | Drill bit | Drill bit shank | Drill bit sizes | Drill and tap size chart | Drilling | Pin chuck | Screw thread | Taps and dies | Tap wrench A die head is a threading die that is used in the high volume production of threaded components. ... A drill is a tool with a rotating drill bit used for drilling holes in various materials. ... Drill bits are cutting tools used to create cylindrical holes. ... The shank is the part of a drill bit grasped by the chuck of a drill. ... Drill bits are the cutting tools of drilling machines. ... Below is a comprehensive drill and tap size chart for all drills, imperial and metric, and taps up to 1 inch. ... An electric drill A drill is a tool with a rotary drill bit used to bore holes through material. ... Two pin chucks. ... Screw thread, used to convert torque into the linear force in the flood gate. ... Taps and dies are metalworking tools for the creation (cutting) of screw threads in metal parts. ... Two Bar tap wrenches and a T style tap wrench A tap wrench is a hand tool used to operate any small tool that has a square driving head as part of its body. ...

Metalworking topics:  

Casting | CNC | Cutting tools | Drilling and threading | Fabrication | Finishing | Grinding | Jewellery | Lathe (tool) | Machining | Machine tooling | Measuring | Metalworking | Hand tools | Metallurgy | Milling | Occupations | Press tools | Smithing | Terminology | Welding Turned chess pieces Metalworking is the craft and practice of working with metals to create parts or structures. ... One half of a bronze mold for casting a socketed spear head dated to the period 1400-1000 BC. This article is about the manufacturing process; for other uses, see Casting (disambiguation). ... A CNC Turning Center The abbreviation CNC stands for Computer Numerical Control, and refers specifically to the computer control of machine tools for the purpose of (repeatedly) manufacturing complex parts in metal as well as other materials, using a program written in a notation conforming to the EIA-274-D... a Cutting Tool, in the context of Metalworking is any tool that is used to remove metal from the workpiece by means of shear deformation. ... Drilling is the process of using a drill bit in a drill to produce holes. ... A typical steel fabrication shop Fabrication is an industrial term generally applied to the building of metal machines and structures. ... Metalworking finishing is the activity of making things out of metal in a skillful manner. ... Rotating abrasive wheel on a bench grinder. ... Jewellery (Jewelry in American English) is literally any piece of fine material used to adorn one’s self. ... Conventional metalworking lathe In woodturning, metalworking, metal spinning, and glassworking, a lathe is a machine tool which spins a block of material so that when abrasive, cutting, or deformation tools are applied to the block, it can be shaped to produce an object which has rotational symmetry about an axis... A lathe is a common tool used in machining. ... A machine tool is a powered mechanical device, typically used to fabricate metal components of machines by the selective removal of metal. ... The examples and perspective in this article or section may not represent a worldwide view. ... Turned chess pieces Metalworking is the craft and practice of working with metals to create parts or structures. ... Metalworking hand tools are hand tools that are used in the metalworking field. ... Metallurgy is a domain of materials science and of materials engineering that studies the physical and chemical behavior of metallic elements, their intermetallic compounds, and their mixtures, which are called alloys. ... Cutters for a milling machine. ... It has been suggested that this article or section be merged with Smith (metalwork). ... Power press with a fixed barrier guard A press, or a machine press is a tool used to work metal (typically steel) by changing its shape and internal structure. ... A smith or metalsmith is a person involved in the shaping of metal objects. ... This article needs to be wikified. ... Welding is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. ...


  Results from FactBites:
 
Acme - Wikipedia, the free encyclopedia (351 words)
Acme Thread Form is a screw thread used in specialized applications such as vises and leadscrews.
Acme was the name of a tanker ship before her renaming as Abarenda and subsequent commissioning by the US Navy.
Acme Brick Company is a manufacturer of brick, including decorative shapes, in the United States.
  More results at FactBites »


 
 

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