Acme thread form
Acme threads are a common
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
Precursors to the Acme Thread
The most common profile for threads in a fastener is a V-form; the threads, if sliced parallel to the shaft would describe a series of Vs, representing the apex of the threads and the valleys between them. V-form threads are narrower and weaker closer to the apex, which makes them susceptible to shearing off under loads which would otherwise not cause the screw or nut body to fail.
Jack screws for moving large structures, bench vises and
The Acme Profile
The Acme thread was developed as a compromise, to offer better strength than a V-form while overcoming the problems with the square thread form.
The Acme thread form uses a 29 degree thread angle with flat apex and valley.
External links
* [http://www.mech.uwa.edu.au/DANotes/threads/intro/intro.html Threaded Fasteners]
* [http://www.efunda.com/designstandards/screws/screws_intro.cfm Screw Thread Forms]
* [http://www.gewinde-normen.de/en/index.html International Thread Standards]
* [http://www.roymech.co.uk/Useful_Tables/Cams_Springs/Power_Screws.html Comparision with other power threads]
* [http://www.diracdelta.co.uk/science/source/a/c/acme%20thread/source.html Drawing of an Acme thread]
* [http://www.gewinde-normen.de/en/trapezoidal-coarse-thread.html Trapezoidal coarse thread]
* [http://www.gewinde-normen.de/en/trapezoidal-fine-thread.html Trapezoidal fine thread]
Look at other dictionaries:
- Screw — A screw is a shaft with a helical groove or thread formed o its surface ad provisio at oe ed to tur the screw. Its mai uses are as a threaded fasteer used to hold objects together, ad as a simple machie used to traslate torque ito… (Wikipedia)
- Acme — ( _el. "ακμή", "the peak, zeith, prime") deotes the best of somethig.Acme or ACME may also refer to:Fictio ad media Acme Corporatio (A Compay that Makes Everythig), a fictioal compay i the cartoo world of "Looey Tues" ACME… (Wikipedia)
- Screw thread — The operator rotates the two log vertical bolts (via bevel gear).] A screw thread is a helical or tapered structure used to covert betwee rotatioal ad liear movemet or force.A screw thread may be thought of as a iclied plae wrapped… (Wikipedia)
- Thread pitch gauge — Threadig gauges, pictured o the right, are also referred to as pitch gauges ad are used to measure the pitch or lead of screw threads. The uppermost gauge i the image is a ISO metric pitch gauge, the larger gauge i the ceter is for… (Wikipedia)
- Fishtail-Center gauge — Fishtail-Ceter gauges, the left image is a fishtail gauge, the right image is a ceter gauge.Both gauges are used i metalworkig ad serve the same purpose, for checkig the agles whe gridig the profiles of lathe screw cuttig tools. They… (Wikipedia)
- Buttress thread — form refers to oe of several screw thread profiles."Buttress thread" i machieryI machiery, "buttress thread" is a thread form desiged to hadle extremely high axial thrust i oe directio. (The resistace to axial thrust… (Wikipedia)