GB2260728A - Router template guides - Google Patents
Router template guides Download PDFInfo
- Publication number
- GB2260728A GB2260728A GB9122647A GB9122647A GB2260728A GB 2260728 A GB2260728 A GB 2260728A GB 9122647 A GB9122647 A GB 9122647A GB 9122647 A GB9122647 A GB 9122647A GB 2260728 A GB2260728 A GB 2260728A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tool
- skirt
- chuck
- base
- guide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27C—PLANING, DRILLING, MILLING, TURNING OR UNIVERSAL MACHINES FOR WOOD OR SIMILAR MATERIAL
- B27C5/00—Machines designed for producing special profiles or shaped work, e.g. by rotary cutters; Equipment therefor
- B27C5/10—Portable hand-operated wood-milling machines; Routers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q35/00—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually
- B23Q35/04—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor
- B23Q35/08—Means for transforming movement of the feeler or the like into feed movement of tool or work
- B23Q35/10—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only
- B23Q35/101—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only with a pattern composed of one or more lines used simultaneously for one tool
- B23Q35/102—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only with a pattern composed of one or more lines used simultaneously for one tool of one line
- B23Q35/104—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only with a pattern composed of one or more lines used simultaneously for one tool of one line with coaxial tool and feeler
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Automation & Control Theory (AREA)
- Milling, Drilling, And Turning Of Wood (AREA)
Abstract
A router (10) comprises a housing mounting a motor having a chuck (18) on its output shaft (14) which receives a rotary cutting tool (not shown). A base (32) is mounted on the housing for axial slidable displacement with respect to the rotation axis (30) of the tool chuck and has an aperture (34) through which the tool protrudes for working on a workpiece (40) beneath the base. A template guide (50) is provided which comprises a plate (52) radially adjustably securable in the base aperture and having a downwardly depending cylindrical skirt (58). The tool (not shown) passes through the skirt (58) and the template guide which is centred with respect to the tool chuck by a centering plug (80) having a stem (88) for reception in the tool chuck and a conical surface (82, 84) concentric with said stem and is pressed against a concentric edge of the skirt to centre the skirt with respect to the conical surface prior to securing the template guide in the base aperture. <IMAGE>
Description
Router Template Guides
This invention relates to router template guides and particularly to an arrangement and method of centering the guide with respect to a tool received in a chuck of the router.
Routers comprise a housing for a motor having a chuck on its output shaft, the chuck being adapted to receive a variety of cutting tools for performing cutting operations on a workpiece. The router has a base having a smooth bottom for sliding over the workpiece. The base is mounted on the housing, usually through pillars slidable in the housing, so that the base is axially adjustable with respect to the rotation axis of the tool. The base has an aperture through which the tool can project for working on the workpiece.
The aperture is or may be circular and concentric with the tool but this is not essential for normal operation of the router where the router simply slides over the workpiece being manually guided, for example by handles provided on the housing, as the user wishes. A guide fence is frequently provided for attachment to the base and this enables the user to follow an edge of the workpiece to cut a slot or other shape inboard of the edge at a fixed distance therefrom.
However, it is frequently desired to follow an edge of the workpiece quite closely to the line of cut of the tool, for example when working on the base of a groove or slot already formed on the workpiece. For this purpose a template guide may be used which fits in the aperture in the base of the router and which has a cylindrical edge which protrudes beneath the base of the router and through which the router tool passes. The outside diameter of the template guide determines how far a given tool will work from the guiding edge. The inside diameter of the guide determines what size of tool can be fitted. Of paramount importance, however, is the concentricity of the guide with respect to the tool.
Apart from determining how close the tool can be allowed to approach the inside of the guide (and thus how close the tool can work to the guiding edge), if the guide is eccentric with respect to the tool then rotation of the router with respect to the guiding edge will change the distance between the tool and that edge. This error would be particularly apparent when following curved guiding edges because this would effect the relative rotation of the guide and edge.
Consequently it is extremely desirable to ensure that the template is concentric with the tool. Usually, concentricity is assumed in the base of the router because the tool chuck, motor, housing, pillars and base are all accurately formed and assembled and are arranged with minimum radial free play. Thus it is a matter simply of not allowing any adjustment in the positioning of the template in the base, and then assuming that if the template is concentric with the base, then it will also be concentric with the tool.
However, it is an undesirable burden to place on a router manufacturer that concentricity of the aperture in the base with respect to a tool in the chuck must be ensured because even small errors in the intervening components may conspire to provide a large error between them. Consequently it is an object of the present invention to provide an arrangement whereby absolute concentricity of the base aperture and chuck is not essential in order to arrange for a template guide which is concentric with the router tool chuck.
In accordance with this invention there is provided a router comprising a housing mounting a motor having a chuck on its output shaft, the chuck being adapted to receive a rotary cutting tool, and a base mounted on the housing for axial slidable displacement with respect to the rotation axis of the tool chuck and having an aperture through which the tool is adapted to protrude for working on a workpiece beneath the base and in which a template guide is provided comprising a plate radially adjustably securable in the base aperture and having a downwardly depending cylindrical skirt for following a guide edge on the workpiece and through which skirt the tool is adapted to pass, the template guide being adapted to be centred with respect to the tool chuck by a plug having a stem for reception in the tool chuck and a conical surface concentric with said stem, which surface is adapted be pressed against a concentric edge of said skirt to centre the skirt with respect to the conical surface prior to securing the template guide in the base aperture.
Said template guide plate preferably comprises a sleeve pinch clamp and an adaptor which is tubular and is provided with a slit from end to end, and said skirt is formed on a separate sleeve member, the adaptor being sized to fit said sleeve member which is secured in the guide plate by actuation of said pinch clamp around the adaptor and sleeve member.
A variety of different sized sleeve members may be provided and in which case a number of different adaptors may also be provided having internal dimensions substantially matching the outside diameters of respective sleeve members, whereby said different sleeve members may be secured in said plate and individually centred once secured therein.
The invention also provides a template guide kit for a router comprising a housing mounting a motor having a chuck on its output shaft, the chuck being adapted to receive a rotary cutting tool, and a base mounted on the housing for axial slidable displacement with respect to the rotation axis of the tool chuck and having an aperture through which the tool is adapted to protrude for working on a workpiece beneath the base, said kit comprising a plate radially adjustably securable in the base aperture and having a downwardly depending cylindrical skirt for following a guide edge on the workpiece and through which skirt the tool is adapted to pass, and a centering plug for centering the template guide with respect to the tool chuck, the plug having a stem for reception in the tool chuck and a conical surface concentric with said stem, which surface is adapted to be pressed against a concentric edge of said skirt to centre the skirt with respect to the conical surface prior to securing the template guide in the base aperture.
The invention also provides a method of centering a template guide in a router which comprises a housing mounting a motor having a chuck on its output shaft, the chuck being adapted to receive a rotary cutting tool, and a base mounted on the housing for axial slidable displacement with respect to the rotation axis of the tool chuck and having an aperture through which the tool is adapted to protrude for working on a workpiece beneath the base, said method comprising the steps of::
a) fitting a centering plug in the chuck, the plug
comprising a stem for reception in the tool chuck
and a conical surface concentric with said stem;
b) loosely fitting a template guide in the base
aperture, which guide comprises a plate radially
adjustably securable in the base aperture and has a
downwardly depending cylindrical skirt for follow
ing a guide edge on the workpiece;
c) pressing said conical surface against a concentric
edge of said skirt to centre the skirt with respect
to the conical surface; and
d) securing the template guide in the base aperture.
The invention is further described hereinafter, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a section through part of a router according to the present invention;
Figure 2 is a similar section to Figure 1 but arranged differently;
Figure 3 is a section on the line III-III in Figure 1; and;
Figures 4a to d are sections through a variety of different template guide sleeve members for use in a router according to the present invention.
A router 10 is shown in the drawings with its housing and motor largely removed. The housing mounts a bottom bearing 12 of a motor output shaft 14 which is adapted to be rotated by the motor. The output shaft 14 has a tapering bore 16 to receive a coned collet 18. The collet 18 has a cylindrical internal bore 20 to receive a cutting tool (not shown) which is gripped by the collet on tightening of a threaded collet nut 22 screwed onto the output shaft 14 which is correspondingly threaded for this purpose.
The collet nut 22 and collet also have coned engaging surfaces 24 near a distal end of the collet to further grip a tool inserted in the collet.
The housing has two cylindrical sleeves (not shown) parallel to the rotation axis 30 of the output shaft 14 each to slidably receive pillars 26, 28. The pillars are firmly fixed in a router base 32 which has a central base aperture 34. A low friction surface 36 is applied to the base 32.
Operation of the router 10 is quite conventional and well known in which the base 32, 36 is positioned on a workpiece 40, a tool (not shown) is fitted in a collet 18, the motor is operated and the tool is plunged into the workpiece through the base aperture 34 for carrying out cutting operations on the workpiece. The housing usually has handles (not shown) for manipulating the router and sliding the housing on the pillars 28 to effect such plunging of the tool.
However, having worked, for example, a groove 42 in the workpiece 40 it is often desired then to work a further groove 44 in the base of groove 42 a fixed distance X from one edge 46 of the groove 42. For this and similar applications it is advantageous to employ a template guide 50. This comprises a sleeve pinch clamp 52, adaptor 54 and sleeve member 56 defining a skirt 58 adapted to bear against and be guided by edge 46 of the workpiece 40.
Referring to Figure 3, the sleeve member 56 is clamped by the sleeve pinch clamp 52 through the adaptor 54. A nut and bolt 60 are employed for this passing through two legs 62 of the clamp 52. The adaptor is split at 64 along its length, and has a key 66 to engage a corresponding notch in the clamp 52 to locate the adaptor in the clamp.
This arrangement is versatile in two respects. Firstly, the depth of penetration below the bottom level of base 36 can easily be adjusted to suit the depth of the guide edge 46. Secondly, different sleeve members can be employed as shown in Figures 4a to d. Figures 4a,b and c each fit in the adaptor 54 shown in the drawings, but each has a skirt 58 of different dimensions. These allow a given tool to cut groove 44 closer (58c) or further (58, 58b) from guide edge 46.
Needless to say, the inside diameter of the sleeve member skirt determines the maximum diameter of the tool receivable within its confines and so, while a small diameter tool will cut at some distance from edge 46, a large diameter tool, even though using sleeve member 56, may still cut close to the guide edge 46. For even larger distances (in the case of a small diameter tool), or for even larger tools, adaptor 54 can be dispensed with entirely and large sleeve member 56d of
Figure 4d may be fitted directly in the clamp 52.
Where it is desired that the groove 44 be cut close to guide edge 46 (as is frequently required) then whether one uses a small diameter tool in sleeve member 56c or a large diameter tool in sleeve member 56 or 56d, it is imperative that the skirt 58 is concentric with the rotation axis 30 of the tool. If they are eccentric with respect to one another then the guide will not accurately serve its purpose because one aspect of template guides is that one is frequently following a curved guide edge 46 around perhaps the entire circumference of the skirt 58. Thus if it is eccentric with respect to the tool, the distance of the slot 44 from the guide edge 46 will vary depending on the angular position of the router with respect to the guide edge as it makes its cutting stroke.
While it is a relatively simple matter to ensure that there is no radial freeplay between, say, the output shaft 14 and the housing of the router, or indeed the housing and the pillars 26, 28, it is quite another matter, given the manufacturing tolerances it is desirable to use, to ensure that the aperture 34 is absolutely concentric with the output shaft axis 30.
Consequently the present invention is provided to allow for the almost inevitable errors that can accumulate and which result in base to shaft eccentricity when generous tolerances are employed in a given router's manufacture. The sleeve pinch clamp 52 is arranged to be radially adjustable in the base aperture 34. The clamp 52 sits on a shoulder 35 around the aperture 34, and the outside diameter of the clamp 52 is arranged sufficiently smaller than the inside diameter of the shoulder 35 to allow for most cases of eccentricity between the aperture 34 and axis 30. The clamp is secured to the base 32 by two screws 70 passing through holes 72 in the clamp 52 which are arranged sufficiently large to accommodate the aforementioned allowance for eccentricity.
To centre the skirt 58 with respect to the axis 30, once the appropriate sleeve member 56 has been clamped in the sleeve pinch clamp 52, a centering plug 80 is provided. The plug 80 has two conical surfaces 82, 84 and a threaded bore 86 concentric with the conical surfaces. A threaded stem 88 is screwed into the plug bore, in the case of Figure 1, from the large diameter end of the plug 80. The stem 88 is then inserted and secured in the collet 18 as an ordinary tool bit.
The template guide 50, when assembled as desired, is loosely secured in place in the base 32, and then the housing is lowered on the pillars 26, 28 until the plug 80 enters the sleeve member 56 as shown by dotted lines in Figure 1. Cone 82 is sized to fit sleeve member 56, while cone 84 is adapted to fit sleeve member 56d. In either event, the plug adjusts the radial position of the sleeve 56 so that when the screws 70 are tightened to lock the template guide in position, the concentricity of the skirt 58 (or 58b, c and d of Figure 4) with respect to the axis 30 is assured.
Figure 2 illustrates a modified arrangement in which the stem 88 is screwed into the small diameter end of the plug 80, and the stem 88 is inserted in the collet 18 through the sleeve member 56 which has already been loosely positioned in the base aperture 34.
Obviously this technique is not applicable for sleeve member 56c because its skirt 58c is too small to receive the stem 88. Nevertheless, this method of operation is advantageous in two respects. Firstly, the action of pulling the cones 82, 84 into engagement with the skirt 58 also urges the template carrier plate into engagement with the base aperture 34, which pulling is conveniently assisted by the normal spring biassing of the housing away from the base 32.
Consequently the centering operation is somewhat facilitated.
Secondly, the cones 82, 84 directly centre the skirt 58 itself, rather than indirectly through the other end of the sleeve member 56, even though this is a concentric edge with respect to the skirt 58.
Claims (8)
1. A router comprising a housing mounting a motor having a chuck on its output shaft, the chuck being adapted to receive a rotary cutting tool, and a base mounted on the housing for axial slidable displacement with respect to the rotation axis of the tool chuck and having an aperture through which the tool is adapted to protrude for working on a workpiece beneath the base and in which a template guide is provided comprising a plate radially adjustably securable in the base aperture and having a downwardly depending cylindrical skirt for following a guide edge on the workpiece and through which skirt the tool is adapted to pass, the template guide being adapted to be centred with respect to the tool chuck by a plug having a stem for reception in the tool chuck and a conical surface concentric with said stem, which surface is adapted to be pressed against a concentric edge of said skirt to centre the skirt with respect to the conical surface prior to securing the template guide in the base aperture.
2. A router as claimed in Claim 1 in which said template guide plate comprises a sleeve pinch clamp and an adaptor which is tubular and is provided with a slit from end to end, and said skirt is formed on a separate sleeve member, the adaptor being sized to fit said sleeve member which is secured in the guide plate by actuation of said pinch clamp around the adaptor and sleeve member.
3. A router as claimed in Claim 2 in which said adaptor is exchangeable with other adaptors or is dispensable to suit differently sized sleeve members.
4. A template guide kit for a router comprising a housing mounting a motor having a chuck on its output shaft, the chuck being adapted to receive a rotary cutting tool, and a base mounted on the housing for axial slidable displacement with respect to the rotation axis of the tool chuck and having an aperture through which the tool is adapted to protrude for working on a workpiece beneath the'base, said kit comprising a plate radially adjustably securable in the base aperture and having a downwardly depending cylindrical skirt for following a guide edge on the workpiece and through which skirt the tool is adapted to pass, and a centering plug for centering with respect to the tool chuck, the plug having a stem for reception in the tool chuck and a conical surface concentric with said stem, which surface is adapted be against a concentric edge of said skirt to centre the skirt with respect to the conical surface prior to securing the template guide in the base aperture.
5. A kit as claimed in Claim 4, in which said template guide plate comprises a sleeve pinch clamp and an adaptor which is tubular and is provided with a slit from end to end, and said skirt is formed on a separate sleeve member, the adaptor being sized to fit said sleeve member which is secured in the guide plate by actuation of said pinch clamp around the adaptor and sleeve member.
6. A kit as claimed in Claim 5 in which said adaptor is exchangeable with other adaptors or is dispensable to suit differently sized sleeve members.
7. A method of centering a template guide in a router which comprises a housing mounting a motor having a chuck on its output shaft, the chuck being adapted to receive a rotary cutting tool, and a base mounted on the housing for axial slidable displacement with respect to the rotation axis of the tool chuck and having an aperture through which the tool is adapted to protrude for working on a workpiece beneath the base, said method comprising the steps of: :
a) fitting a centering plug in the chuck, the plug
comprising a stem for reception in the tool chuck and a
conical surface concentric with said stem;
b) loosely fitting a template guide in the base
aperture, which guide comprises a plate radially
adjustably securable in the base aperture and has a
downwardly depending cylindrical skirt for following a
guide edge on the workpiece;
c) pressing said conical surface against a concentric
edge of said skirt to centre the skirt with respect to
the conical surface; and
d) securing the template guide in the base aperture.
8. A router, a template guide kit and a method of centering a template guide in a router, substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9122647A GB2260728B (en) | 1991-10-25 | 1991-10-25 | Router template guides |
DE9214256U DE9214256U1 (en) | 1991-10-25 | 1992-10-19 | Guide for a router |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9122647A GB2260728B (en) | 1991-10-25 | 1991-10-25 | Router template guides |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9122647D0 GB9122647D0 (en) | 1991-12-11 |
GB2260728A true GB2260728A (en) | 1993-04-28 |
GB2260728B GB2260728B (en) | 1994-04-27 |
Family
ID=10703508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9122647A Expired - Fee Related GB2260728B (en) | 1991-10-25 | 1991-10-25 | Router template guides |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE9214256U1 (en) |
GB (1) | GB2260728B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10223893B4 (en) * | 2002-05-29 | 2009-08-13 | Festool Gmbh | router |
DE102013015697A1 (en) * | 2013-09-20 | 2015-03-26 | Festool Gmbh | Hand machine tool and abutment with a tool support surface |
-
1991
- 1991-10-25 GB GB9122647A patent/GB2260728B/en not_active Expired - Fee Related
-
1992
- 1992-10-19 DE DE9214256U patent/DE9214256U1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
GB9122647D0 (en) | 1991-12-11 |
GB2260728B (en) | 1994-04-27 |
DE9214256U1 (en) | 1992-12-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3645640A (en) | Rotary cutter tool | |
US4027992A (en) | Boring tool guide device | |
US7168900B2 (en) | Total support with a collet chuck receiver | |
US4602798A (en) | Collet arbor for application to turning and milling procedures | |
US6257595B1 (en) | Collect chuck with quick-change cap | |
US4319503A (en) | Tube facing machine | |
US3874688A (en) | Collet adapter | |
CA2593332C (en) | System, method, and apparatus for drill bit alignment and depth control with ergonomic drill motors | |
JPS6344483B2 (en) | ||
US5445478A (en) | Hand-held apparatus for machining of cylinder head valve guide holes | |
CN216421836U (en) | Be applied to manipulator and lathe of lathe | |
US5957636A (en) | Quick change tool locking and alignment system | |
GB2260728A (en) | Router template guides | |
EP1329273A1 (en) | Adjustment device for self-colleting drill motors | |
US3599260A (en) | Threading chuck | |
US8851812B1 (en) | Quick change power tool chuck | |
US3746353A (en) | Collet chuck adapter | |
US4702131A (en) | Hand driven precision tapping system | |
US4860497A (en) | Drill grinder having drill holder including chucks for gripping shank and body of the drill | |
US5918515A (en) | Lathe reference stop and combination tool | |
US3395927A (en) | Tool holder and tool assembly | |
US4268959A (en) | Pipe cutter | |
US3981211A (en) | Self-centering tool holding apparatus | |
US6705185B2 (en) | Lathe for interior cutting of hollow work pieces | |
US2729991A (en) | Pre-set boring tool |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19961025 |