🔥 USA1 - Dual cutter router bit - Google Patents

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The Router Bits - Using Slot Cutter Bits

There is a further need to provide such a router bit that will act as a compression bit. On the other hand, the router bit of the present invention is designed principally for nested based CNC applications, where tenon cutting occurs on the work piece in situ, before the work piece is separated from the sheet stock. Indeed, there is apparently no way for an adjustable router bit such as described in the ' patent to be employed in a nested based manufacturing operation. A nested based CNC machine delivers vacuum over the entire work table, which is typically 4 feet by 8 feet in size, but which, like sheet stock, can be of a different size. Thus, the ' patent essentially teaches a complicated structure that offers no real advantage in nested based CNC manufacturing, and it therefore proceeds in a different direction than that which is currently being pursued. However, neither the ' bit nor any other router bit in the prior art solves or even addresses the remaining six problems cited above in such a CNC nested based environment. The router bit described in U. The upper cutter and the lower cutter are separated by an intermediary shaft 6 , whose diameter is less than that of the principal shaft for reasons that will be explained. Longitudinally displaced below the upper cutter at a rigidly fixed distance is a lower cutter 7 , comprising a lower right blade 8 and a lower left blade 9 see, e. It will readily be seen that in the embodiments shown in FIGS. In other embodiments, it comprises separate elements that may be axially secured. For example, the prior method of dealing with sheet stock of varying thickness has been to precisely measure the thickness of each sheet stock panel at various locations, to attempt to exactly position the tenons on the various edges of the resulting work pieces. A spoil board is a rectangular panel of fiberboard, the same size as the sheet stock, used to protect the machine's work table by allowing the various tools to cut through the sheet stock and slightly into the spoil board typically, in the order of 0. In many embodiments, the two principal cutters are shaped and oriented such that the router bit is as a compression bit. In general, sheet stock is available with one good face, intended for the exterior of the cabinet, and one lesser face, intended for the cabinet interior. If channels could be cut into the sheet stock and spoil board so that the ' router bit did not need to plunge or bottom cut, its locking nut and associated structures would still impinge upon the spoil board, improperly positioning the cutting blades.

The router bit includes an upper and a lower cutter, axially aligned and separated by a fixed longitudinal displacement. Better adhesives ensure that glued joints will remain rigid for many years. In this position, the machine is able to position a cutter correctly to form a joint on the edge of the work piece.

In fact, all of these errors frequently occur. Since the sheet stock is positioned on the work table with the interior face up, positioning of the resulting tenons in respect to wing cutter router bits exterior bottom face is extremely important, to ensure that any visual or mechanical imperfections resulting from such thickness variations appear on the upper surface of the work pieces, i.

Finally, there is a need, in some circumstances, for such a bit that can also provide three-position cutting action, as described above. This lack of intervening space restricts the router bit's ability wing cutter router bits be correctly positioned vertically.

Accordingly, there is no apparent need to adjust corresponding tenon widths. Examples of such joints would be: lock miter, lock shoulder, finger dovetail and French dovetail. Skilled craftsmen have built fine cabinetry since the dawn of history. The present router bit comprises a shaft supporting a pair of cutters longitudinally separated in fixed mutual displacement by an intermediary structure.

The work pieces are held firmly against the spoil wing cutter router bits, which is, in turn, held firmly against the machine's vacuum work table.

Multiple vacuum pods are positioned to adequately support and secure the work piece whose size may vary greatlyand to elevate it above the machine's work table.

The various embodiments of the router bit of the present invention will be described in the order shown in the Drawing. Clearly, therefore, the ' bit is applicable only to point-to-point and manual manufacturing, and is wholly impractical in a nested based application, 10 where the spoil board must be flush with the lower surface of the sheet stock to hold vacuum.

In some embodiments, the intermediary structure comprises or supports a third cutter. Compression bits, per se, are, of course, well known in the art. This firmly secures and flattens the entire surface of the sheet stock to the spoil board and, thus, to the work table.

Certain problems are commonly encountered in nested based CNC operations, particularly where tenon formation on work piece edges, in situ, is desired. Of the two types of CNC machines now utilized, point-to-point manufacturing more closely resembles traditional woodworking methods and, therefore, can more easily utilize existing cutters, such as 'type router bits.

No substantial portion of the bit extends beyond the lower end of the lower cutter. After sawing, wing cutter router bits joints may be further see more onto selected edges of certain parts using a variety of traditional cutters well known in the art.

Accordingly, there is a need for a router bit to efficiently form tenons at precise positions on selected edges of work pieces created from sheet stock, in situ.

Since none of the work pieces are elevated, access to the edges of a particular work piece is severely restricted by the close proximity of the adjacent work pieces in the wing cutter router bits.

This invention relates to the field of woodworking and, in particular, cabinet making. In some embodiments, the router bit is integral.

Clearly, this requires a great deal of time, effort and expense, without providing any guarantee of success. However, plywood, particleboard and fiberboard substrates, whether or not surface bonded with a laminated wood veneer or plastic, do not lend themselves readily to some traditional joinery techniques, because the shape of such joints, when used with these materials, may easily cause the material to fracture or even crumble when the pieces are assembled, or the tolerances of such a joint must necessarily be so wide that the essential purpose of the joint is defeated.

With this machine, the full e. Over the millennia, steady improvements in cabinet design and execution have transformed what originally was merely utilitarian manufacture into a recognized and admired art form.

What has been said about the ' patent applies even more strongly in respect to the other patents, mentioned in passing above, that are cited in the ' patent. The reason for this distinction is that the router bit taught in the ' patent is designed exclusively for cutting on the edge of a work piece that has already been removed from the sheet stock.

Because fiberboard is porous, the suction created by the vacuum pulls through the spoil board, into the sheet stock. The cutters may use wing blades or spiral blades. However, all embodiments lack any projection beyond the lower cutter, other than those wing cutter router bits of the lower cutter that enable go here plunge cutting.

However, there are some circumstances where it might be desirable ac casino 2020 new the portion of the router bit that impinges beef week 2020 south australia the tenon edge as a guide to be able to trim that edge as the tenon is cut.

However, except that the longitudinal spacing between the upper cutter 3 and the lower cutter 7 is fixed, the invention does not depend on all router elements being integral.

As the router bit moves around the edges of the various work pieces in the nest, forming tenons, the router bit must be able to drill down into the sheet stock and spoil board, thereby cutting its own channels or paths of travel. The upper right blade 5 see, e. Certain embodiments provide means for separating components of the router bit, e. Screws, nails and staples have been greatly improved and can now be power driven. The router bit needs to form tenons on the edges of the work pieces in the nest with the exterior face of the sheet stock oriented downward and the interior face upward, to facilitate additional machining of the work pieces—e. Furthermore, veneer can convert a relatively inexpensive substrate, e. Reference can, for example, be made to the following U. The longitudinal spacing of the two cutters can easily be determined and implemented by a tool manufacturer, in light of these teachings, so that the desired tenon width can be achieved despite slight wastage from the cutting process. To be sure, these all represent steps in the progressive evolution of the cabinetmaking art. Museums, everywhere, display superb examples of the cabinetmaker's art, and examples of Seventeenth and Eighteenth Century cabinets and other furniture pieces from noted artists often command huge prices at auction. Typical router bits used for these purposes and related usages are described abundantly in the literature. This is in contrast to the spiral blades shown, e. At this juncture, it should also be noted, as stated, that the upper cutter 3 and lower cutter 7 are separated by a rigidly fixed distance. In order to insure clarity in this discussion, certain conventions will be adopted. But if the ' router bit were used with a point-to-point CNC machine, the pilot ball bearing 24 would probably need to be removed and replaced with shims 26 , as identified in that patent. But they do not effectively solve many significant problems specifically addressed and solved by the present router bit, to be described below, in detail. Referring to FIG. One need only carefully inspect a relatively small number of kitchen cabinets to observe this. However, the ' bit appears not to have been intended for use in a point-to-point CNC machine, but rather with hand held router motors and manual routing machines, where the shape of the work piece, itself, would serve as the pattern against which the pilot ball would ride. Also, it is well recognized that solid wood, in addition to its expense, may not be the best material available for cabinet and drawer body structures, as it tends to swell, shrink and warp over time, even if well seasoned before use. The portion of the bit intervening between the upper and lower cutters may also be configured as a cutter. This will be explained further as the various embodiments are described. The other type of CNC woodworking machine is referred to as a nested based machine. Field of the Invention. In some embodiments, the lower cutter may be configured with bottom face blades to allow the router to be used as a plunging bit. Veneer has been used for centuries for intricate inlay work, to increase panel stability and to reduce cost. Using a kitchen cabinet with a door, four sides, a back and a shelf as an example, the four sides, shelf and back can be cut from sheet stock, essentially by sawing to size the desired outline of each particular part. Thus, in the router bit of the present invention, the longitudinal distance between the upper cutter and lower cutter is fixed when the router bit is manufactured or assembled, so that, in use, it will create tenons of a specific desired width. The lower cutter is positioned in proximity to, and below, the lower end of the intermediary shaft. As stated above, nested based CNC manufacturing requires router bits capable of plunge cutting into the sheet stock, and then bottom cutting and linear cutting, in situ. Variations of the 'type router bit have been used with a separate jig or fixture, which is used to hold the work piece, as well as to guide the pilot ball bearing. With the possible exception of very small scale manufacturers, cabinetmakers now tend increasingly toward mechanization of processing steps, often utilizing computer controlled equipment. Finally, the router bit must form clean tenons without chipping either the interior or exterior faces of the work pieces. Furthermore, the ' bit uses the outer bearing race to guide the bit as it moves along the edge of the work piece, cutting the tenon. These may be compared and contrasted as follows:. To be sure, the materials employed have changed substantially. Crudely made cabinets, often seen installed in kitchens and closets, commonly utilize simple butt joints, i. However, development of the structural aspects of cabinetmaking has not entirely kept pace with the skill of woodworkers and the exacting artistic and decorative requirements of those willing to pay substantial sums for their finest products. Other aspects of the invention, in its various embodiments, will be seen in reference to the Drawing and the ensuing discussion. But all of these various types of joint continue to be utilized today, differing little from their predecessors of hundreds of years ago, and practitioners of ordinary skill understand them and are familiar with their respective positive and negative features. Mortise widths are standardized. This is in contrast to the configuration taught in the ' patent, which purports to make this separation adjustable. Such a third-position cutter is not taught in the ' Finally, the adjustment principle, which is the salient feature of the ' patent, has little application in CNC nested based manufacturing, where accuracy, consistency and repeatability are crucial for cost effective, high speed production. In that environment, the ' router bit will not plunge or bottom cut, because its locking nut 32 and associated structures are in the way. The work pieces are all in the same plane.