Abstract: A portable tool for milling a chamfer edge on a workpiece includes a milling tool mounted on a motorized drive unit. A hood is carried on the drive unit and partially houses the milling tool. The hood has a bottom opening adjacent the path of the milling tool. A V-shaped guide structure is mounted adjacent the hood opening and includes a pair of guide plates spaced to provide an opening for supporting the edge of the workpiece that is to be cut adjacent the cutting path of the milling tool. An internally mounted bracket in the hood supports the guide plates.

Abstract: A pressing mechanism for machines for shaping workpieces. The mechanism has a rotatebly driven spindle on which are secured shaping tools having a path diameter determine by cutters. The mechanism also has presser elements that, as viewed in the direction of feed of workpieces that are to be shaped, are disposed ahead of and behind the spindle. To adapt to varying path diameters and forming depths of the cutters, the presser elements can be displaced transverse to the axis of the spindle. To adapt to varying path diameters of the tools, the presser elements can be moved in opposite directions at an angle to the direction of feed. To adapt to the respective forming depths of the cutters, the presser elements can be moved in different opposite directions at an angle to the direction of feed.

Abstract: An electric hand plane has a wedge-shaped body having a lower wedge surface adapted to rest on a workpiece and an upper wedge surface, a plane housing supported on the upper wedge surface of the wedge-shaped body and having a counter-surface, a device for producing a clamping force between the upper wedge surface of the wedge-shaped body and the counter-surface of the housing, and a single handle operative for cancelling the clamping force during an adjustment and also for displacement of the wedge-shaped body, and a gear mechanism means arranged so that the handle displaces the wedge-shaped body relative to the plane housing via the gear mechanism means by rotation.

Abstract: A portable tool for milling a chamfered edge on a workpiece, includes a cutting attachment installed on a motorized drive unit. The cutting attachment includes a rotary milling cutter partially encircled by a hood element that carries a V-shaped guide structure adapted for sliding engagement with edge areas of the workpiece. The hood is attached to the motorized drive unit by an eccentric cam means, which can be adjusted to vary the penetration distance of the milling cutter into the workpiece. Various cutting depths can be achieved by adjusting the hood in relation to the rotational axis of the motorized drive unit. The V-shaped guide is arcuately adjustable to vary the slant angle of the chamfered edge independently of the cutting depth adjustment.

Abstract: An automatic welding apparatus and an automatic milling apparatus for machining welding grooves in order to weld a three-dimensional surface such as a ball tank or the like are disclosed. A welding wire spool is accommodated within a case and a cover to prevent the welding wire from being oxidized and from being contaminated with foreign materials. The automatic milling apparatus is installed to form welding grooves on the both sides of the objects to be welded, in the case where a welding is performed on a three-dimensional curved surface. A guide roller having a handle is installed to control the machining depth of the grooves, and an idling type nylon guide roller is installed in closed contact with the shaft of a cutter, thereby adjusting the distance between the rail and the groove, and adjusting the deviations of the depth of the grooves, which are caused by the machining inaccuracies due to the deviations of the three-dimensional curvature.

Abstract: A device for preparing a coke oven door includes a frame for securing the door in a working position. A milling machine for machining the door seal includes a gantry coupled to the frame and a milling head coupled to the gantry. The milling head is movable up and down, longitudinally, and transversely relative to the door so as to maintain contact with the door seal. According to one aspect of the invention, a rail is attached to the frame and a rail extension is attached to the gantry. The rail and rail extension cooperate to guide the gantry longitudinally along the door. A rack is attached to the frame and a driven pinion is attached to the milling machine which engages the rack to move the milling machine along the rail and rail extension.

Abstract: A method is provided for embodying a plane reference defined by a specific equation within a rough surface of a frame of a structure being assembled. The equation characterizing the reference surface is stored in a memory. With the aid of an optical sighting mechanism, spatial data is obtained which makes it possible to calculate an equation characterizing the rough surface. The data relating to the equations of the reference surface and the rough surface are compared in an information processing unit. A mobile machining device is positioned close to the rough surface. The machining device is controlled by specific orders generated by the comparison of the equations for the reference and rough surfaces respectively. The machining device gradually rectifies the rough surface to make it progressively coincide with that of the spatial equation of the reference surface.

Abstract: The present invention provides a method and apparatus including a rotor mountable fixture for guiding a cutting tool powered by a hand held air motor to machine a gas turbine engine rotor without removing the rotor from its mountings in the engine. In one particular embodiment the fixture includes a root having the same contour as a blade root slot of a rotor, a base having a platform attached to the root, and a machining guide in the form of a bushing restrained in a guide slot operable to receive and guide a hand held air motor powered cutting tool for machining the rotor. The present invention provides an accurate means to machine a gas turbine engine rotor without removing the rotor from its mounting. In one particular embodiment a method for machining the rotor in the field is provided using a hand held air motor to power a machining tool to cut a blade damper pocket in the dovetail slot of a pressure compressor rotor.

Abstract: Horizontal motorized drive rods in an upright rectangular frame control the movement of vertical guide rods in the X direction of the frame. Motorized guide rods move a router on a movable mount along the Y direction. A plungeable router, spring-mounted on the guide rods, is moved adjustably into the plane in the Z direction. The router removes glazing from a window sash and cuts deeper into the rabbit joint of the sash to allow double pane glass to be inserted into the sash. A rotary saw, with blade depth adjustment is swivel mounted to another vertical guide for cutting a slot in both vertical and horizontal rabbit joints to receive glazing beads. Pins rigidly mounted in front of and behind the cutting edges of the rotary saw blade act as guides and stops for the saw. Horizontal threaded rods with opposing right and left threads on either side of the center of the horizontal rod forms a centering device.

Abstract: The end of a laid flooring board between adjacent laid flooring boards can be jointed by a jointer including a router mounted on a slide slidable along ways carried by a frame held in position on flooring by pressure on a positioning plate attached to the jointer frame and having a reference line for registration with a flooring joint and an undersurface capable of gripping the flooring to prevent inadvertent shifting of the frame during a jointing operation.

Abstract: Machining apparatus comprises a boom displaceable along spaced rails and a carriage displaceable along the boom perpendicularly to the displacement direction of the boom. A machining station is adjustably supported on the carriage by three adjustment means to adjust a machine head, such as a milling cutter, towards and away from a workpiece disposed between the rails beneath the machining station. Adjustment of the machine head results from inaccuracies in the level of the rails and/or the displacement of the carriage. Variations in the level of the rails and/or carriage are determined by a respective sensor associated with each adjustment means which monitors a reference defined by a planar laser beam. Alternatively one of the three adjustment means between the machining station and the carriage may be replaced by a pivot with the third adjustment means being arranged to adjust the machine head relative to the remainder of the machining station.

Abstract: An apparatus to facilitate the maintenance of internal combustion engines, particularly aircraft engines, comprising a mounting apparatus, positioning rod, and pivoting arms from which a grinding, cleaning, or resurfacing tool may be mounted and operated within a single plane of rotation about the positioning rod. In the preferred embodiment of the device the mounting apparatus is made to be mounted upon a variety of common aircraft engines.

Abstract: A localized grinder is traversed in series over flat tension mask support rails affixed to a CRT front panel to produce a constant "Q"-height on the mask support surface above the rails. A local measuring device is used to develop point-specific rail height information relative to the screen edges for operation of the grinder in order to ascertain an effective "Q"-height measurement from the panel surface.

Abstract: A chamfering device incorporating a power tool for driving a rotary bur or the like provided with an elongated shaft and a cutting head, wherein the shaft is enclosed at a small clearance by a first, mainly tubular member, which, after mounting of the shaft with the said first member fitted thereto in the power tool, is held in position by a second, mainly tubular member, which is fixed to the power tool and is connected to the first member thereby arresting this in position, a third, mainly tubular member being provided over the second member, said third member being displaceable in the axial direction of the second member and lockable in occupied positions, said third member being an adjustable extension of the second member.

Abstract: Adjustable machining apparatus for machining a cylindrical workpiece, such as an electrical generator rotor or stator. The apparatus includes a spindle for holding a cutting tool, which spindle in turn is engaged by a motor for rotating the spindle and cutting tool. Attached to the spindle is a swivel for pivoting the spindle about a pivot point laying on a first axis parallel to the longitudinal axis of the workpiece. A first translation mechanism is attached to the swivel for moving the swivel along a second axis perpendicular to the first axis. A second translation mechanism is connected to the first translation mechanism for moving the first translation mechanism along a third axis transverse to the longitudinal axis of the workpiece. A third translation mechanism is connected to the second translation mechanism for moving the second translation mechanism along a fourth axis paralle to the longitudinal axis of the workpiece.

Abstract: A power plane is mounted between opposed side plates and positioned upon respective first and second support plates that are in turn secured to interior surfaces of the side plates in confronting relationship to position and orient the plane structure relative to a workpiece top surface. A modification of the invention includes the plane structure arranged for pivotment to provide angular adjustment of the power plane relative to the workpiece.

Abstract: A machine tool comprises a support structure having first and second opposite ends spaced apart along an axis, a drive assembly mounted on the support structure at the first end thereof, the drive assembly comprising at least one drive motor, and an output drive shaft coupled drivingly to the drive motor. The machine tool also comprises a machining head mounted on the support structure at the second end thereof, a tool support member mounted on the machining head and movable relative thereto, and a transmission shaft coupling the output drive shaft to the tool support member to effect movement of the tool support member. The transmission shaft extends parallel to the axis of the support structure over at least a substantial part of the distance of the first end of the support structure from the second end thereof.

Abstract: Methods and apparatus for cutting a groove in a structure are disclosed. Large structures such as steam turbines have pumping grooves or similar features which may be machined using the simplified methods and apparatus disclosed. In a preferred embodiment, a milling head affixed to a magnet which may be selectively activated is provided. Additional clamping means are also provided which are affixed to the magnet and engage the structure to further affix and align the apparatus in place. The milling head is positioned at the location of the groove and held fast by the magnet; the additional clamping means ensure the apparatus stays in place while the groove is being cut. The apparatus disclosed may be operated by a single operator using conventional power sources and without the need for extensive set up, fixturing and the like normally associated with milling operations of this nature.

Abstract: A portable machine tool includes a bed and a cantilevered ram mounted for movement in a longitudinal direction along the ways thereof. A dovetail slide on a side of the ram movably supports a rotatable spindle unit capable of machining in the transverse direction completely crossways of the bed.

Abstract: A method of using a rotor mountable fixture for guiding a cutting tool powered by a hand held air motor to machine a gas turbine engine rotor without removing the rotor from its mountings in the engine is provided. In one particular embodiment the fixture includes a root having the same contour as a blade root slot of a rotor, a base having a platform attached to the root, and a machining guide in the form of a bushing restrained in a guide slot operable to receive a guide a hand held air motor powered cutting tool for machining the rotor. The present invention provides an accurate means to machine a gas turbine engine rotor without removing the rotor from its mounting. In one particular embodiment a method for machining the rotor in the field is provided using a hand held air motor to power a machining tool to cut a blade damper pocket in the dovetail slot of a pressure compressor rotor.

Abstract: An attachment for use with a portable power planer for consistently producing a scarf cut of a particular angle in sections of plywood or like material which are to be joined to form a continuous piece of material. The attachment produces the scarf cut by positioning blades of the power planar at an angle in relation to the horizontal top surface of the plywood or like material. The blades of the planar, when moved longitudinally across said plywood or like material, removes a section of plywood or like material corresponding to the angle. Consistent angles are maintained and scarf cuts are produced quickly and consistently in materials to be joined.

Abstract: A carbide tipped cutting tool adapted to shape the edge surface of a counter top which opens about a sink or bowl mounted therebeneath. The cutting tool is provided with a plastic follower adapted to engage the side wall of the sink or bowl to facilitate cutting and shaping of the edge portion of the counter top. The plastic follower is formed of nylon or Delrin and captively holds a ball bearing member therein.

Abstract: Machining apparatus comprises a boom rotatable about a pivot support within a cylindrical workpiece with a machining station, such as a milling cutter, mounted on the remote end of the boom. Two angularly spaced wheel units are provided on respective sides of the boom to support the boom on the workpiece. Each wheel unit has an actuator to raise or lower that side of the boom relative to the support surface. Variations in the level of the support surface are determined by sensors monitoring a reference such as a rigid template or a planar laser beam. Each actuator has a respective sensor for independently adjusting each wheel unit and each sensor may be on a radius from the pivot to the associated wheel unit.In an alternative embodiment, the boom is linearly displaceable along spaced rails and the machining station is displaceable perpendicularly to the linear direction along the boom.

Abstract: The machine comprises on a body bearing and rolling devices (5), a guiding arrangement constituted by adjustable claws (11) adapted to bear against the edge of the work piece (30) to be chamfered, and a router (20) including a milling cutter (24) mounted on the body to be pivotable in a plane perpendicular to the edge, the milling cutter (24) being located between the claws (11).

Abstract: A portable chamfering tool comprises a casing; a rotating shaft projected from one end of the casing; a ring-shaped connector arranged on the outer circumference of the rotating shaft, and having a ring-shaped groove formed on the outer circumference of the ring-shaped connector; a ring-shaped boss attached to the outer circumference of the ring-shaped connector so as to freely move in the axial direction of the connector; a guide plate attached to the ring-shaped boss; adjusting and fixing rings screwed onto the ring-shaped boss, the adjusting ring having a recess formed at the upper portion thereof; a connecting plate movably arranged in the recess of the adjusting ring and urged to the center of the ring-shaped connector to engage the ring-shaped groove on the outer circumference of the ring-shaped connector; a cutter chip fixed to the rotating shaft, which passes through the ring-shaped boss, with a part of it projected downward from the underside of the guide plate, and a guide attached to the rotating s

Abstract: A chamferring machine has a machine body provided with a rotary cutter formed with cutting edges on its outer periphery. The rotating cutting edges chamfer the side edge of a workpiece. A guide is mounted on the base of the machine body and has two guide surfaces intersecting at a predetermined angle and brought into contact with the side edge of the to-be-chamferred workpiece. The cutting edges of the rotary cutter are partially exposed through a hole formed in the guide, at the intersection of the guide surfaces. A displacement unit is provided on the machine body and the guide, for moving the rotary cutter relative to the guide, in the axial directions of the displacement unit.

Abstract: A cutting guide for hand-held routers has a guide fence which pivots about a base. The guide fence engages a workpiece and provides a steady support for a variety of routing operations including bevelling or chamfering, splining, rabbeting, dadoing and edging. The cutting guide also has an after-cut guide to provide additional support.

Abstract: A router jig comprising a baseplate having an open interior, a first horizontal guide adjustably attached to the baseplate, a first vertical guide attached to the baseplate, and a clamp adjustably fastened to the baseplate for receiving a workpiece. Both the first horizontal guide and the first vertical guide extend across the open interior of the baseplate. A second horizontal guide is also adjustably attached to the baseplate. This second horizontal guide extends across the open interior of the baseplate and is in adjustable parallel relationship to the first horizontal guide. A second vertical guide is also adjustably attached to the baseplate so as to be in adjustable parallel relationship to the first vertical guide. The clamp includes a first board and a second board that are adjustably fastened to the underside of the baseplate. The clamp includes a suitable adjustment mechanism for fixing the position of the workpiece within the clamp.

Abstract: A machine for chamfering the corner of an object comprising a rotating cutter arranged in a machine body and having cutting blades around the outer circumference of that portion of the rotating cutter which is projected from and tilted relative to an underside, a slide guide for slidably supporting the underside of the machine body and having guide planes perpendicular to each other and slidable along the corner of the object and also having a space formed between the planes and into which at least a part of the cutting blades of the rotating cutter is projected, a fixing means for connecting the machine body and the slide guide releasably from each other to adjust the cutting blades projected into the space between the guide planes of slide guide, and a stud means having a first end fixed to one of the machine body and slide guide at a position remote from the rotating cutter and serving to make the machine body and the slide guide swingable to each other when the fixing means is under release.

Abstract: A tool for and method of resurfacing an annular end of an oil burner nozzle adaptor on which an oil burner nozzle is detachably mounted in abutting sealing engagement during oil burner operation. The tool includes a cutter having a plurality of cutting teeth having cutting edges lying in a common plane perpendicular to an axis of rotation. The cutting teeth are concentrically positioned relative to the adaptor end and, during rotation, cut and resurface the same.

Abstract: A cutting tool guide assembly for guiding a cutting tool over a workpiece for making a precise cut on the workpiece, including an elongate rail member, a trolley mounted for movement along the length of the rail member with the trolley supporting the cutting tool for cutting operations on the workpiece, and a securing member fixed to the rail member for securing the rail member with the workpiece and a method for using same.

Abstract: A chamfering device comprising a housing in which a motor is housed, a guide base arranged at one end of this housing, a rotating shaft which is driven by the motor and whose front end is projected outside from the guide base, a chamfering blade fixed to the front end portion of the rotating shaft, partly projecting outside from the guide base, and a guide located further on the front side of the rotating shaft than the chamfering blade and attached to the front end of the rotating shaft. The guide can be contacted with the face adjacent to the chamfering portion of a workpiece.

Abstract: Disclosed is a bench mountable joining machine. The joining machine comprises machine apparatus for supporting and positioning a workpiece while making a slot-like plunge cut into a joint surface of the workpiece. The machine also includes a base member for removably mounting the machine to a bench.

Abstract: A machine for chamfering the corner of an object comprising a rotating cutter arranged in a body, a slide guide pivoted slidably relative to the underside of the body and having guide planes perpendicular to each other and slidable along the corner of the object and also having a space which is formed between the guide planes and into which at least a part of cutting blades of the rotating cutter is projected, a stopper screw for connecting the slide guide and the body slidable to each other and serving to keep the cutting blades projected into the space by a predetermined distance, and a means for adjusting the cutting blades projected into the space.

Abstract: An apparatus and method for forming a workpiece or chair mat with cleats on the underside thereof, and with a marginal peripheral area void of cleats, and for trimming the edge of a generally planar workpiece. A rotatable work table is provided for positioning the workpiece. A router head includes an inclined router blade engageable with the edge of the workpiece to form a beveled ramp edge thereabout. A template is positioned between the workpiece and the work table, and the router head has a cam follower engageable with and movable along the edge of the template for guiding the router blade along the edge of the workpiece during rotation of the work table. A cooling medium is directed toward the area of engagement between the router blade and the edge of the workpiece. The depth of cut is controlled by a cam disk mounted on the bottom of the router head engageable with the top of the workpiece.

Abstract: Disclosed is a plate joiner having a superior miter guide for mitered carcase joints. The plate joiner comprises a system for forming a plunge cut. The joiner also includes a miter guide for securely engaging the mitered portion of carcase workpieces and for accurately and reliably locating plunge cuts perpendicularly into opposing mitered carcase joint surfaces so that, when a joint is glued together with a plate in opposing plunge cuts, a closed joint having mitered outside workpiece surfaces is formed, independent of workpiece thickness.

Abstract: A semi-automatic track drill for use in drilling fastener holes for an aircraft body includes a pair of generally spaced, parallel rails. A plurality of slider bars extend between the rails and are connected thereto in a manner so that each bar can be slid along the length of the rails. Positioned between at least two of the bars is a drill carriage which is also slidably connected to the rails. A template having a series of alternating lands and grooves registers the carriage at preselected drilling positions. The drill assembly, including the template, is secured to the aircraft body by temporary clamping bolts which are positioned in a line along the body's surface.

Abstract: A cutting tool guide device fits within a window frame in a vertically mounted position. The device guides a cutting tool, such as a router, along the X,Y, and Z coordinates. Simultaneous movement along the X and Y coordinates parallel to the window is possible by means of vertical and horizontal controls which allows any angle or curves to be followed. Measured adjustment along the Z coordinate, perpendicular to the window, is provided by a screw threaded router tool casing mounted in a collar with external measured detentes contacted by a spring loaded ball. Rotary movement of the router is restrained by a slot in the router receiving a-pin. Great precision is obtained in removing glazing from a window sash and in cutting into the rabbit joint of the sash. The cutting allows double pane glass to be inserted into the sash. The cutting tool guide device is adjustable to fit into various sized window frames.

Abstract: A milling tool adapted to be mounted upon an existing supporting frame for a coin box for the purpose of enlarging an existing slot or opening in the frame at a predetermined location. The tool includes a mounting element which is temporarily secured to the support frame on a first wall thereof, and a rotating tool, the operative end of which projects through the wall to engage a second wall at right angles thereto, the second wall having an existing opening to be englarged. The rotating part of the tool is pivoted about an axis perpendicular to the axis of rotation during operation to permit cutting of an accurately defined area.

Abstract: The present invention relates to a cutting device suitable for cutting one part of a laminate to conform its shape to the other part of the laminate. The device comprises a vertical motion means mounted on a horizontal motion means, the vertical motion means having a rotating cutting blade mounted thereon. The cutting device is able to conform a veneer to the exact shape of a subsurface base within 0.001 inch.

Abstract: A device for the machining of the shell surfaces of the drying cylinders of a paper machine and particularly for the grinding thereof, which device comprises a carriage (1) which is displaceable in the direction of the length of the drying cylinders and to which a grinder is attached. In order that the grinding could be carried out easily and rapidly and with only a short downtime of the paper machine, the carriage of the device is formed by a frame carriage (1) which is provided with supporting elements (13) for the support thereof both against a drying cylinder (9) of the paper machine and against a second cylinder (10) of the paper machine so that it is positioned between said cylinders (9, 10) when the device is in operation. There are preferably eight supporting elements (13, 14) provided, four of which are arranged to be positioned against the drying cylinder (9) to be ground and the other four against the second cylinder (10).

Abstract: An improved portable milling machine adapted to grip a work piece and to cut a keyway through a clamping area. This is accomplished without releasing the grip of the milling machine on the work piece by forming an elongated slot in a bed plate with lands lying at opposite sides of the elongated slot. A clamp plate is arranged in stacked alignment with said lands and a work piece is gripped between the clamp plate and the lands of the bed plate. This structure permits a cutting element to pass through the elongated slot to cut a keyway upon the work piece while said work piece is gripped, the cutting action being performed through the clamped area. Improvements include interchangeable spindle construction allowing the use of a variety of cutter elements.

Abstract: The milling instrument has a caliper which is inserted into a medullary cavity and a spindle which is linked to the caliper at an angle. The spindle carries a milling cutter as well as a guide shoe at the distal end which slides within a guideway at the distal end of the caliper. The instrument is able to cut a circular arc corresponding to the boundary line between the spongiosa and cortical tissue in the region of the calcar arc.

Abstract: A press brake having bed and ram members whose tool-holding faces, edges and surfaces need reconditioning due to wear, and a portable milling machine adapted to be fixed to the press brake to mill and thus recondition the faces, edges and surfaces. An improved milling machine comprising an elongated carriage-support assembly supported on the bed and separated from the ram, a milling-head assembly having a carriage and a set of cutters seated on the carriage with the milling-head assembly being mounted on the carriage-support assembly, and a carriage-feed drive assembly coupled to the carriage to drive the milling-head assembly the length of the carriage-support assembly with the cutters selectively engaging any faces, edges and surfaces needing reconditioning.

Abstract: The present invention is directed to a method and apparatus for shaping the inside corner of slabs of material comprised primarily of polymethyl methacrylate filled with alumina trihydrate. The process involves fastening a connecting slab between horizontal and vertical slabs and shaping the connecting slab with an arcuate shape which meets the flat surfaces of the horizontal and vertical slabs. The tool for the process has cutting surfaces to create the indicated inside corner shape and is used in conjunction with a base for a rotary motor router. The resulting product has a rounded inside corner which appears molded as a single piece, rather than a combination of pieces or slabs.

Abstract: A depth of cut adjusting mechanism for a planer comprising an infeed shoe which is spring biased upwardly from the plane in which the planer cutter operates against a stop provided by a spiral cam formed on the infeed shoe and abutting a cam follower adjustably supported on the planer.

Abstract: A gang drill head having a row of drills spaced according to repeated patterns of holes in a tubular member such as a suction roll in a paper-making machine which are clogged and are to be cleared by drilling the same, the drill head being guided for longitudinal movement along a guide member positioned upon the roll for circumferential incremental movement to effect radial movements of the rotating drills for the full circumference of the roll and the head including longitudinal adjustment of individual drill supports in accordance with the spacings of the repeated patterns of holes in the roll. The individual drill chucks are rotated simultaneously and manually controlled linkage causes raising and lowering of the drill head by a fluid-operated unit.

Abstract: A portable milling tool for milling pipes, tubes, cylinders, and the like has a collet at one end thereof for securing and centering the tool to the work piece. An adjustable in-line rod connects the collet to the tool and permits the collet to secure or release the work piece. An in-line shaft moves the tool into or out of engagement with the work piece. The tool is of compact design allowing it to be used in on-site situations wherein tool size is a problem.

Abstract: A portable router for cutting slots in a cabinet door to receive wings of hinges includes a router motor and spindle mounted on a slide which moves back and forth on a frame. The latter rests on the door when cutting each slot and is located on the door by a selected one of two guides. The latter are disposed on opposite sides of the spindle and project down beneath the frame into an active position but may be pushed up to a retracted or inactive position. One guide is adapted to engage one end of the door and its spacing from the spindle is correlated with the desired spacing between that end and the adjacent slot. Similarly, the other guide is adapted to engage the other end of the door and locates the spindle for cutting the slot near that end. As the frame is lowered onto the door, the latter engages the inactive guide which thereby is pushed up to its retracted position and the guide drops by gravity to its active position as the router is lifted off the door.

Abstract: The present invention is directed to a method and apparatus for shaping the inside corner of slabs of material comprised primarily of polymethyl methacrylate filled with alumina trihydrate. The process involves fastening a connecting slab between horizontal and vertical slabs and shaping the connecting slab with an arcuate shape which meets the flat surfaces of the horizontal and vertical slabs. The tool for the process has cutting surfaces to create the indicated inside corner shape and is used in conjunction with a base for a rotary motor router. The resulting product has a rounded inside corner which appears molded as a single piece, rather than a combination of pieces or slabs.