View source for Shaper

{{Otheruses}}
[[Image:ShaperSlideClapperBox.jpg|thumb|Shaper tool slide, clapper box and cutting tool]]
[[File:Shaper with boring bar.jpg|thumb|Shaper with [[Boring (manufacturing)|boring bar]] setup to allow cutting of internal features, such as keyways, or even shapes that might otherwise be cut with [[wire EDM]].]]
{{Refimprove|date=January 2010}}

A '''shaper''' is a type of [[machine tool]] that uses [[wikt:linear#Adjective|linear]] relative motion between the workpiece and a [[Tool bit|single-point cutting tool]] to [[Machining|machine]] a linear toolpath. Its cut is analogous to that of a [[lathe]], except that it is linear instead of [[Helix|helical]]. A shaper is analogous to a [[Planer (metalworking)|planer]], but smaller, and with the cutter riding a ram that moves above a stationary workpiece, rather than the entire workpiece moving beneath the cutter. The ram is moved back and forth typically by a [[Crank (mechanism)|crank]] inside the column; [[Hydraulic cylinder|hydraulically actuated]] shapers also exist.

==Types==
Shapers are mainly classified as standard, draw-cut, horizontal, universal, vertical, geared, crank, hydraulic, contour and traveling head.<ref>[http://shopswarf.orcon.net.nz/b/sh.html Shaper Mechanism Types]</ref>  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 is essentially the same thing as a '''slotter''' (slotting machine), although technically a distinction can be made if one defines a true vertical shaper as a machine whose 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. As size increases, the mass of the machine and its the power requirements increase, and it becomes necessary to use a motor or other supply of mechanical power. This motor drives a mechanical arrangement (using a pinion gear, bull gear, and crank, or a chain over sprockets) or a hydraulic motor that supplies the necessary movement via hydraulic cylinders.

==Operation==
[[Image:Shaper.png|right|thumb|300px|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. Table motion may be controlled manually, but is usually advanced by an automatic feed mechanism acting on the [[screw (simple machine)|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 along the stroke axis. This tool-slide holds the ''clapper box '' and toolpost, from which the tool can be positioned to cut a straight, flat surface on the top of the workpiece. The tool-slide permits feeding the tool downwards to deepen a cut. This adjustability, coupled with the use of specialized cutters and toolholders, enable the operator to cut internal and external gear tooth profiles, splines, dovetails, and keyways.

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.<!-- insert informative diagrams or links -->

==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 (metalworking)|broaching]] setup.
* Dovetail slides
* Internal splines
* Keyway cutting in [[blind hole]]s
* It is even possible to obviate [[Electrical discharge machining|wire EDM]] work in some cases. Starting from a drilled or cored hole, a shaper with a boring-bar type tool can cut internal features that don't lend themselves to milling or boring (such as irregularly shaped holes with tight corners).

== History ==
Roe (1916) credits [[James Nasmyth]] with the invention of the shaper in 1836.<ref>{{Harvnb|Roe|1916}}, [http://books.google.com/books?id=X-EJAAAAIAAJ&pg=PA92#v=onepage&f=false p. 92].</ref> Shapers were very common in industrial production from the mid-19th century through the mid-20th. In current industrial practice, shapers have been largely superseded by other machine tools (especially of the [[Numerical control|CNC]] type), including [[milling machine]]s, [[grinding machine]]s, and [[Broaching (metalworking)|broaching machines]]. But the basic function of a shaper is still sound; tooling for them is minimal and very cheap to reproduce; and they are simple and robust in construction, making their repair and upkeep easily achievable. Thus they are still popular in many machine shops, from [[Job production|jobbing shops]] or [[Maintenance, repair, and operations|repair shops]] to [[Tool and die maker|tool and die shops]], where only one or a few pieces are required to be produced and the alternative methods are cost- or tooling-intensive. They also have considerable [[retro]] appeal to many hobbyist machinists, who are happy to obtain a used shaper or, in some cases, even to build a new one from scratch.

==See also==
* [[Planer (metalworking)]]

==References==
{{Reflist}}

== Bibliography ==
* {{Roe1916}}

==External links==
*[http://www.lathes.co.uk/adeptshaper/ Lathes.co.uk information archive on hand-powered shapers]
*[http://www.youtube.com/watch?v=QtA5KuV7ahs YouTube video of a vintage shaper in action]
*[http://www.youtube.com/watch?v=JZdbNWoySo0 YouTube video of a newly built hobbyist shaper  in action]

{{Metalworking navbox|machopen}}
{{Types of tools}}
[[Category:Machine tools]]
[[Category:Metalworking tools]]

[[ar:مقشطة نطاحة]]
[[az:Yonma]]
[[bn:শেপার মেশিন]]
[[de:Stoßmaschine]]
[[es:Limadora]]
[[hr:Blanjanje]]
[[it:Limatrice]]
[[pl:Strugarka]]
[[sk:Obrážačka]]
[[sv:Kipphyvel]]
[[Category:2Fix]]