Shaper

Shaper tool slide, clapper box and cutting tool

This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. Please improve this article by introducing more precise citations where appropriate. (October 2008)

A shaper is a machine tool used for shaping or surfacing metal and other material.

Shapers have been largely superseded by milling machines or grinding machines in modern industrial practice. The basic function of a shaper machine is still sound and tooling for them is minimal and very cheap to reproduce. They can be invaluable for jobbing or repair shops where only one or a few pieces are required to be produced and the alternative methods are cost or tooling intensive. The mechanically operated machines are simple and robust in construction, making their repair and upkeep easily achievable.

Types

Shapers are mainly classified as standard, draw-cut, horizontal, universal, vertical, geared, crank, hydraulic, contour and travelling head. The horizontal arrangement is the most common. Vertical shapers are generally fitted with a rotary table to enable curved surfaces to be machined. The vertical shaper differs from a slotter (slotting machine), as the slide can be moved from the vertical. A slotter is fixed in the vertical plane.

Very small machines have been successfully made to operate by hand power. Once size increases, up to a potential 36 inch stroke, the power needs increase and it becomes necessary to use an electric motor. This motor drives a mechanical arrangement (using a pinion gear, bull gear and crank) or a hydraulic motor which supplies the necessary movement via hydraulic cylinders.

Operation

Shaper linkage. Note the drive arm revolves less for the return stroke than for the cutting stroke, resulting in a quicker return stroke and more powerful cutting stroke.

A shaper operates by moving a hardened cutting tool backwards and forwards across the workpiece. On the return stroke of the ram the tool is lifted clear of the workpiece, reducing the cutting action to one direction only.

The workpiece mounts on a rigid, box shaped table in front of the machine. The height of the table can be adjusted to suit this workpiece, and the table can traverse sideways underneath the reciprocating tool which is mounted on the ram, the table motion is usually under the control of an automatic feed mechanism which acts on the feedscrew. The ram slides back and forth above the work, at the front end of the ram is a vertical tool-slide that may be adjusted to either side of the vertical plane. This tool-slide holds the clapper box and toolpost from where the tool can be positioned to cut the straight, flat surface on the top of the workpiece. The tool-slide permits feeding the tool downwards to put on a cut it or may be set away from the vertical plane, as required.

The ram is adjustable for stroke and, due to the geometry of the linkage, it moves faster on the return (non-cutting) stroke than on the forward, cutting stroke. This action is via a slotted link or whitworth link.

Cutting fluid may be employed to improve the finish and prolong the tool's life.

Uses

The most common use is to machine straight, flat surfaces but with ingenuity and some accessories a wide range of work can be done. Other examples of its use are:

• Keyways in the boss of a pulley or gear can be machined without resorting to a dedicated broaching setup.
• Dovetail slides
• Internal splines
• Keyway cutting in blind holes

See also

• Planer (metalworking) or planing machine

References

• Shaper Mechanism Types Crank, Rack or Geared, Friction Geared and Hydraulic
• [1]

v • d • e Metalworking   Machining and Computing CNC, CAD, and CAM 2.5D · CAD · CAE · CAM · CNC · G-code · Numerical control · Stewart platform Drilling and Threading Die head · Drill · Drill bit · Drill bit shank · Drill bit sizes · Drill and tap size chart · Drilling · Jig borer · Pin chuck · Screw thread · Tap and die · Tap wrench Grinding and Lapping Abrasive · Angle grinder · Bench grinder · Coated abrasives · Cylindrical grinder · Diamond plate · Flick grinder · Dresser · Grinding · Grinding machine · Grinding wheel · Jig grinder · Lapping · Sanding · Spark test · Surface grinder · Tool and cutter grinder · Whetstone Machining and Milling Electrical discharge machining · Electro chemical machining · Endmill · Engraving · Hobbing machine · Lathe · Machine tool · Machining · Milling cutter · Milling machine · Planer · Pantograph · Shaper Machine tooling Angle plate · Chuck · Collet · Jig · Fixture · Indexing head · Lathe center · Machine taper · Magnetic base · Mandrel · Rotary table · Wiggler Terminology Chatter · Cutting fluid · Cutting speed · Swarf · Tolerance · Tramp oil Casting · Fabrication · Forming · Jewellery · Machining · Metallurgy · Smithing · Tools & Terminology · Welding