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The ball sits in a socket, which can be tightened to lock the ball in place. A stem extends from the ball which terminates at the head mount. They tend to have fewer parts than other types of tripod heads due to their simple mechanism, but the parts must be precisely machined to fit well together and provide smooth movement, increasing their ...
The camera is attached to the ball by means of quick release plate or a simple UNC 1/4"-20 [7] screw. The socket encloses the rotating ball and also contains the controls for locking the ball. The socket has a slot on the side to allow the camera to be rotated to the portrait orientation. Ball heads come in varying degrees of complexity.
Only the Ball-Scope mount invented later can rival the steady smoothness of a Dobsonian. Thin mirrors : Instead of costly Pyrex mirror blanks with the standard 1:6 thickness ratios [ 1 ] (1 cm thick for every 6 cm in diameter) so they don't flex and sag out of shape under their own weight, Dobson used mirrors made out of glass from surplus ship ...
The trailer hitch ball attaches to a ball mount; with a diameter typically 1 ⁄ 16 inch (1.6 mm) larger than the ball bolt/shank diameter. [2] The ball mount must match the SAE hitch class. [3] The ballmount for a receiver-type hitch is a square bar that fits into a receiver attached to the vehicle.
The first Newtonian telescope was mounted in this way; the ball was held in place by wrought iron springs. Another type uses a bowling balls as a mount axis. [1] There are modern commercial and amateur mount designs for Newtonian telescopes that have the "ball" built into the base of the optical tube assembly. These mounts have the advantage of ...
For example, a widely used ball bearing slide in the furniture industry is a ball bearing drawer slide. Commonly constructed from materials such as aluminum, hardened cold rolled steel and galvanized steel , ball bearing slides consist of two linear rows of ball bearings contained by four rods and located on differing sides of the base, which ...