Dovetail joint
A dovetail joint is a compound similar to a tongue and groove, in which the shape of the bung (also: spring tines or cones) reminiscent of the forked shape of the tail of a swallow. As opposed to a tongue and groove, the dove-tail connection to a greater extent is positively not only transversely to the dovetail, but also in the longitudinal direction thereof. The dovetail joint is in the third direction, which is also transverse to dovetail together.
With a dovetail joint with multiple " jagged " dovetail one also speaks of a " tree connection". This space-saving form is particularly common for attaching blades of turbomachines. The high centrifugal forces are distributed in connection to multiple contact surfaces.
Applications
Dovetail joints are used in many areas of technology, including:
- Wood connection, mainly because no additional metallic fasteners (nails, screws, ...) are required. It is especially used for the connection of solid woods at about drawers, chests or even musical instruments.
- Attachment of the blades on the impeller of a turbomachine.
Hook blade with dovetail
Variants
Making a dovetail joint
Groove for attachment clamp on a machine tool
Compressor blade with dovetail
Turbine blade with " fir-tree "
Turbine blade with " fir-tree "
Also in machine tools using dovetail joints, where in the machine table a trapezoidal groove ( see picture above) are incorporated to accommodate clamps with corresponding, negative trapezoidal shape, in which the clamps are inserted from the side and then frictionally connected by Verklemmmen with the workpiece.
After almost identical principle function called dovetail guides, with the difference that not on rigid, non-positive connection, but on a positive, the translation permitting sliding value is placed. This type of dovetail guide can be realized by a special arrangement of needle cage rail guides as a rolling base.
- Connecting element
- Turbomachinery
- Timber