Gear cutting – milling – or planing – Milling – Randomly manipulated – work supported – or work following device
Patent
1994-08-10
1996-01-23
Briggs, William
Gear cutting, milling, or planing
Milling
Randomly manipulated, work supported, or work following device
33 2703, 144 24, 144134D, 144136C, B23C 120, B27C 510
Patent
active
054860768
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention concerns a radius-milling fixture.
Semicircular doors or other articles with circular-shaped cutouts or edges need to be fabricated as precisely and inexpensively as possible. For medium-sized carpentry shops, the use of computer-controlled machine tools which allow a precise manufacture is generally ruled out for cost reasons. Furthermore, such machines can only be used in the workshop. Because of their heavy weight, they cannot be used on site.
An often-employed technique of making circular cutouts, for example in particle board, consists in striking a circle on a particle board with a compass and then cutting out the board along the periphery of the circle with a hand saw. However, this technique has the shortcoming that the cutout parts need to be finished by means of an edge grinder in order to smooth the edges. Even so, many edges still remain unclean.
Meanwhile, there is also a known device for machining of corner regions of boards, in which a holder and a carrier arm swiveling on the holder are provided (DE-A-32 23 561). At one end of the carrier arm there is provided a plate to accommodate a height-adjustable manual surface milling cutter. The carrier arm can swivel about an axis, but not itself shift relative to this axis. For this shifting, a special guide rail with a holder arm is required, being connected to the swiveling part of the carrier arm. The entire device is very complicated and bulky, as it consists of many parts that are arranged at angles with respect to each other. This device is not suitable for everyday use in a carpentry shop.
Furthermore, there is a known method of producing rounded sheetlike wood parts, in which grooves are made by using a freely guided surface milling cutter with an end mill and a depth stop (DE-A-38 44 653). The surface milling cutter has a bottom piece with two boreholes, through which guide rods are pushed. By shifting the surface milling cutter on these rails, it is possible to cut grooves into a workpiece at variable distances from a reference point.
Another familiar radius cutting device has a manual surface milling cutter, a central fixation, and a milling guide (DE-GM 88 03 158). The central fixation has a fastening part that can be fixed to a circular disc being cut and a driver that can rotate with respect to this fastening part, on which the milling guide is mounted. Similar to the milling method described above, the fastening part consists of two parallel guide rods. The drawback in this familiar device is that it is relatively cumbersome, since the parallel guide rods must be connected to a special driver, which is fashioned as a circular disc and has a trunnion mounting.
Furthermore, there is a known unit for guiding a router, by which the router can be precisely used in order to fit the edges of a sheet of veneer to the edges of the wood layer underneath (U.S. Pat. No. 4,044,805). However, this device is relatively complicated, so that it cannot be produced cost-effectively.
Finally, there is another known carrier device with a bearing surface to accommodate a milling cutter, having a slot in which a fastening fixture is moved (U.S. Pat. No. 4,798,506). The bearing surface is connected to another part, constituting an elongation, with which the workpiece can be connected. However, the bearing surface cannot be used by itself. Furthermore, it is not possible to cut out grooves with very small radii.
The purpose of the invention is to create a radius-milling fixture that can be made cost-effectively and is easy to use.
This purpose is accomplished by the features of Patent claim 1.
The advantage to be achieved by the invention consists especially in that all common manual surface milling cutters can be used. All that need be done is to provide a carrier plate with boreholes that correspond to the fastening elements of the particular manual surface milling cutters. Furthermore, grooves with very small radii can be cut, since the pivot point of the fixture can be moved below the bearing surface of the milling cutter. In
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