slotting machine
[Applications of Slotting Machines The main applications are cutting keys, slots, metal sheets, grooves of various shapes and forming regular or irregular shapes used in many manufacturing units. It can be used in any workshop where vertical tool movement is necessary and required to manufacture different metal objects.
′släd·iŋ mə‚shēn] (mechanical engineering)Slotting Machine
(in woodworking, called a mortising machine). (1) A metalworking machine for processing hardto-reach, straight or slanted inner and outer surfaces, as well as grooves and mortises of any shape (mainly blind, with small spaces for the free movement of the tool). The principal motion is rectilinear and is produced by the reciprocating motion in the vertical plane of a slide block with a carriage and a slotting tool (or slotter ram) attached to it. The slide block is driven mechanically or hydraulically. The feed movement, which is rectilinear or circular, is achieved by the periodic shifting of the table to which the workpiece is fastened. The output of a slotting machine is lower than that of a milling machine or broach. It is used for single-unit or smalllot production.
(2) In woodworking, a mortising machine is a machine for excavating rectangular and oval grooves, mortises, and apertures in wooden parts. Mortising machines are used in the production of furniture, windows, doors, skis, and parts for railroad cars and ships.
Mortising machines are classified as chain, drill, or cutter types, depending on the type of cutting tool used. The cutting tool in chain mortising machines consists of milling chains of various sizes (depending on the dimension of the groove or recess), which move along a special interchangeable guide bar. The cutting tool of drilling mortising machines is a hollow chisel within which a drill rotates. The working table on which the workpiece is mounted can be moved longitudinally and transversely and tilted from the horizontal. Cutter mortising machines are equipped with flat-pointed tools that have cutting teeth in their lower working portion; the teeth chisel out apertures and simultaneously remove the chips by means of a rocking movement.
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A Slotting machine may also be known as heavy-duty shaper. Slotting machine resembles a shaping machine in all respect except that the ram instead of reciprocating to and fro in the horizontal plane, moves up and down in the vertical plane. Therefore, the slotting machine is sometimes called as vertical shaper. In this article we will see slotter machine functions and types of slotting machine .
See also: Major Shaping Machine parts and its Functions
Functions of Slotting Machine
The main function of a slotting machine is to remove metal from a piece of a work to bring it to the required shape and size. This is accomplished by holding the work rigidly on the machine and a reciprocating single point tool mounted on tool head. The single point tool moves along a vertical axis over the work piece. The pinion which is in mesh with the main gear gets its drive from a pulley through a belt by motor. The gear is coupled to the slotted disc. The circular motion of slotted disc is converted into the reciprocating one with the help of connecting rod. The crank pin can be formally set in the slot of slotted disc at different distances from the centre for verifying the length of the ram stroke. The position of the stroke is adjusted with the help of hand lever provided for the stroke adjustment. Slotting machine is usually provided with horizontal circular worktable, but coordinate tables are also provided some times. The table is mounted directly over a bed casting and heavy work may be placed on it. The circular table can be revolved by hand or power fed. It is graduated around its outer edges and work can thus be mounted and turned to a predetermined position, depending upon the function for which slotter is designed.
Types of Slotter Machine
Slotting machines are mostly of the following four types:
1. Precision Tool Room Slotter
2. Puncher Slotter
3. General Production Slotter
4. Keyseater Slotter
1. Precision Tool Room Slotter
Tool room slotter is precision type with is use for very precise machining. It is lighter machine and is operate at high speeds. By use special jigs machine can handle a number of equal works on a production basis.
2. Puncher Slotter
Puncher slotter is weighty machine and operational with powerful motor. It is propose to remove large quantity of metal as of large castings or forgings. Length of the stroke is too large.
3. General Production Slotter
Production slotter is general type of slotter use for general production work. Drive of ram is by means of slotted disc with connecting rod. Fly wheel is fixed to prevent shock at the end of stroke.
Production Application Of Slotting Machines
4. Keyseater Slotter
Keyseaters, also identified as keyseating machines with keyway cutters, are specific machines designed to cut keyways. It is similar to vertical shapers; the dissimilarity is that cutting tool on a keyseater enters the work piece as of bottom and cuts on down-stroke, as the tool on a shaper enter the work piece as of the top and cuts downward. One more difference is a keyseater has a guiding system over the work piece to reduce deflection, which results in a closer tolerance cut. Process starts by clamping the work piece to the table by a fixture or vise.
This machine can cut other straight sided features other than keyways. They can also make blind slots, which are slots that do not enlarge through the whole work piece.