Frame and panel


Frame and panel

Frame and panel construction (also called "rail and stile") is a woodworking technique often used in the making of doors, wainscoting, and other decorative features for cabinets, furniture, and homes. The basic idea is to capture a 'floating' panel within a sturdy frame, as opposed to techniques like slab drawer fronts which are simply single pieces of material with exposed endgrains. Usually, the panel is not glued to the frame - it is left to 'float' within it so that seasonal movement of the wood comprising the panel does not distort the frame.

Frame and panel construction at its most basic consists of five members: the panel and the four members which make up the frame. The vertical members of the frame are called stiles while the horizontal members are known as rails. A basic frame and panel item consists of a top rail, a bottom rail, two stiles, and a panel. This is a common method of constructing cabinet doors and these are often referred to as a five piece door.

In larger panels it is common to divide the panel into one or more sections. To house the extra panels, dividing pieces known as mid rails and mid stiles or muntins are added to the frame.

Panels

The panel is either captured in a groove made in the inside edge of the frame members or housed in an edge rabbet made in the rear inside edge. Panels are made slightly smaller than the available space within the frame to provide room for movement. Wood will expand and contract across the grain, and a wide panel made of solid wood could change width by a half of an inch, warping the door frame. By allowing the wood panel to float, it can expand and contract without damaging the door. A typical panel would be cut to allow 1/4" (5 mm) between itself and the bottom of the groove in the frame. It is common to place some sort of elastic material in the groove between the edge of the panel and the frame before assembly. These items center the panel in the frame and absorb seasonal movement. A popular item for this purpose is a small rubber ball, known as a "spaceball" (a trademarked product). Some cabinet makers will also use small pieces of cork to allow for movement. The panels are usually either flat or raised.

A flat panel has its visible face flush with the front of the groove in the frame. This gives the panel an inset appearance. This style of panel is commonly made from man-made materials such as MDF or plywood but may also be made from solid wood or tongue and groove planks. Panels made from MDF will be painted to hide their appearance, but panels of hardwood-veneer plywood will be stained and finished to match the solid wood rails and stiles.

A raised panel has a profile cut into its edge so that the panel surface is flush with or proud of the frame. Some popular profiles are the "ogee", "chamfer", and "scoop" or "cove". Panels may be raised by a number of methods - the two most common in modern cabinetry are by coving on the tablesaw or the use of a panel raising cutter in a wood router or spindle moulder.

Frame

The stiles and rails often have a profile cut into the inside edge of the outside face - usually a smaller version to match the profile of the panel. In some panel styles, a profile may also be cut on the outside edge of the outside face.

Frame construction style falls into three categories: cope and stick, mitred sticking and applied moulding. Cope and stick is the most common method, as it is more efficient to manufacture. In modern cabinetry, the cope and stick joinery is achieved with a set of special router cutters. These cut the profile on the edge of the frame parts and also cut a reverse version of the same profile in the ends of the rail so that they may be slipped over the ends of the stiles and glued in place.

In mitred sticking, the profile (known as the sticking) is applied to the edges of both the rail and stile and then a section of the sticking at the ends of each stile is removed leaving a mitred edge which aligns to a similar mitre cut on the ends of the sticking on each rail. This traditional method is more time consuming to complete, hence the popularity of cope and stick for manufactured items.

When applied moulding is to be used, the frame members are joined with mortice and tenon, reinforced butt joint, or bridle joint. Once the panel has been assembled, the moulding is applied to the inside edge of the outer face of the frame. An alternative method is to use a router to cut a sticking profile in the frame after assembly.

The process of making raised panel doors begins with gluing up panels, and then moves into cutting and preparing the frame parts. Next, the panels are cut to size and shaped. Parts and panel are sanded before construction. It is also common to apply a finish to panels prior to assembly so that raw wood is not visible if the panel shrinks. The joints are glued and set into clamps. If the frame and panel items are paint grade they are sometimes nailed at the frame joints on the reverse side. The door then moves on to finish sanding where it is brought to its final thickness, and the outside profile is added if required.

See also

* Cabinet making
* Cabinet (furniture)

External links

* [http://jwpincorporated.com/how_to_make_a_raised_panel_door.pdf Directions on making a raised panel door.]


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