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To cam out (or cam-out) is a process by which a screwdriver
Screwdriver

The screwdriver is a device specifically designed to insert and tighten, or to loosen and remove, screws. The screwdriver is made up of a head or tip, which engages with a screw, a mechanism to apply torque by rotating the tip, and some way to position and support the screwdriver....
 slips out of the head of a screw
Screw

A screw is a shaft with a helix groove or screw thread formed on its surface and provision at one end to turn the screw. Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force....
 being driven once the torque
Torque

Torque is the tendency of a force to rotate an object about an axis . Just as a force is a push or a pull, a torque can be thought of as a twist....
 required to turn the screw exceeds a certain amount.

Frequently, camming out damages the screw, and possibly also the screwdriver, and should normally be avoided. However, the Phillips head
Henry F. Phillips

Henry F. Phillips , a United States businessman from Portland, Oregon, has the honor of having the Phillips-head screw and screwdriver named after him....
 screw and screwdriver combination was designed specifically to cam out, as at the time of its invention torque-sensing automatic screwdrivers did not exist.






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To cam out (or cam-out) is a process by which a screwdriver
Screwdriver

The screwdriver is a device specifically designed to insert and tighten, or to loosen and remove, screws. The screwdriver is made up of a head or tip, which engages with a screw, a mechanism to apply torque by rotating the tip, and some way to position and support the screwdriver....
 slips out of the head of a screw
Screw

A screw is a shaft with a helix groove or screw thread formed on its surface and provision at one end to turn the screw. Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force....
 being driven once the torque
Torque

Torque is the tendency of a force to rotate an object about an axis . Just as a force is a push or a pull, a torque can be thought of as a twist....
 required to turn the screw exceeds a certain amount.

Frequently, camming out damages the screw, and possibly also the screwdriver, and should normally be avoided. However, the Phillips head
Henry F. Phillips

Henry F. Phillips , a United States businessman from Portland, Oregon, has the honor of having the Phillips-head screw and screwdriver named after him....
 screw and screwdriver combination was designed specifically to cam out, as at the time of its invention torque-sensing automatic screwdrivers did not exist. The Phillips design is auto-centering, that is, the screw does not slip off the screwdriver, unlike a normal slotted-head screw or flat-head screws, but cams out once the screw has been driven home. These properties were used to speed up automobile production in the USA in the early years of the industry.

In recent years, automated manufacturing insertion tools can now precisely sense fastener torque. Consequently, it is typical for computer parts, automobiles, and other highly-engineered products, to be assembled with Torx
Torx

TORX, developed by Camcar LLC of Acument Global Technologies , is the trademark for a type of screw head characterized by a 6-point star-shaped pattern ....
 or Pozidriv
Pozidriv

The Pozidriv is a type of screw head and screwdriver, jointly patented by the Phillips Screw Company and American Screw Company. The name is thought to be an abbreviation of positive drive....
 head screws, which have been specifically designed not to cam out.