A lathe
dog
The dog (''Canis familiaris'' or ''Canis lupus familiaris'') is a domesticated descendant of the wolf. Also called the domestic dog, it is derived from the extinct Pleistocene wolf, and the modern wolf is the dog's nearest living relative. Do ...
is a mechanical device typically made of cast iron, steel or aluminum that transmits rotary motion from a
faceplate
Faceplate (face plate, face-plate) is a plate, cover, or bezel on the front of a device, such as:
Computers and electronics
* Electrical outlet, also referred to as a wall plate, outlet cover, or socket cover
* Front panel, of computers
* Head ...
to a workpiece mounted between centers in a lathe. The tail of the dog is rotated by a slot in a driving faceplate, a stud mounted on a faceplate, or sometimes a side of a chuck jaw. The workpiece passes through an aperture in the dog into which the work is secured by one or more setscrews or a clamp arrangement. The maximum cross sectional dimension of the workpiece is limited by the dimensions of the dog aperture. Lathe dogs are provided in ''straight tail'' or ''bent tail'' form, and may be ''single tail'' or ''double tail''. A lathe dog designed to hold square, rectangular or odd-shaped work and having a moveable portion secured typically by two cap screws is called a ''clamp dog''. Bent tail dogs are able to engage directly with a driving faceplate slot or a chuck jaw but can crowd work off centre if clearance is not present between the dog tail and a closed end of the faceplate slot. Straight tail dogs do not present the issue of crowding work off centre but require at least one driving stud to be mounted on the faceplate. If the rotating mass of the dog setup is not balanced, eccentric motion of the work may occur.
[Bond, A. Russell, (1910)]
''Handy Man's Workshop and Laboratory''
New York; Munn & Co., Inc. p. 161 Counterbalancing or reduced spindle speed may be required. Care must be taken by the operator when using lathe dogs, as it is easy to get snagged on one. Use of headless setscrews, preferably of multiple-spline drive design, that do not protrude above the outer surface of the dog is recommended. A lathe dog may also be used with some
indexing heads and other tools with similar faceplates that turn about a center.
See also
*
Lathe faceplate
A lathe faceplate is a basic workholding accessory for a wood or metal turning lathe. It is a circular metal (usually cast iron) plate which fixes to the end of the lathe spindle. The workpiece
A workpiece is a piece, often made of a single ...
*
Mandrel
A mandrel, mandril, or arbor is a gently tapered cylinder against which material can be forged or shaped (e.g., a ring mandrel - also called a triblet - used by jewelers to increase the diameter of a wedding ring), or a flanged or tapered or ...
Patents
* —Buss, Charles. Improvement in lathe-dogs
References
{{Metalworking navbox, machopen
Lathes