Inventor Counterbore Slot
- Inventor Counterbore Slot Kit
- Inventor Counterbore Slot Machine
- Inventor Counterbore Slot Tool
- Inventor Counterbore Slotted
But here is what I have to say about counterbored slots. Assuming you are making a counterbored slot for a socket head cap screw, you had better make the counterbore wide enough for a washer or some thing to support the screw head fully. A counterbore is provided in the front portion of the frame extending inwardly into the front portion of the frame coaxially with the first bore therein. A lip extends downwardly over the top portion of the counterbore at its open end, i.e., at the front or barrel side of the front portion of the frame. Description of a Countersink and Counterbore hole and how to dimension them in an Autodesk Inventor drawing. There are two types of clearance holes, the universal rivet, and countersunk rivet. Basically, that means I need a countersunk hole, and a straight hole. I won’t be using counterbores for rivets. Universal Head Rivet from Aircraft Spruce. A countersunk rivet from Aircraft Spruce. So let’s get started. Whitney Tool Company, celebrates in September its 40th anniversary as a premier manufacturer of industrial cutting tools. The public and the company’s customers, suppliers and sales force are invited to tour the plant and view demonstrations of the manufacturing process during an open house at the plant on Sept.
A butt joint is a technique in which two pieces of material are joined by simply placing their ends together without any special shaping. The name 'butt joint' comes from the way the material is joined together. The butt joint is the simplest joint to make since it merely involves cutting the wood to the appropriate length and butting them together. It is also the weakest because unless some form of reinforcement is used (see below) it relies upon glue alone to hold it together. Because the orientation of the wood usually presents only one end to a long grain gluing surface, the resulting joint is inherently weak.[1]
Methods[edit]
The butt joint is a very simple joint to construct. Members are simply docked (cut off) at the right angle and have a required length. One member will be shorter than the finished size by the thickness of the adjacent member. For enclosed constructions, such as four-sided frames or boxes, the thickness of the two adjacent members must be taken into consideration. For example: when constructing a four sided box made from 19mm thick material that is to be of finished size 600mm x 600mm, two of the members will be docked at 600mm and two will be docked at 600mm - 19mm - 19mm = 562mm.
Reinforced butt joints may require additional steps which are detailed below.
In solid timber, docking of members for a butt joint is usually a crosscut, so a crosscut saw is best for this job. When working with sheetgoods, there is no distinction between crosscut and rip cut.
The joint members can be docked by any of the following methods:
- Carcase butt joints
- Circular saw and straightedge
- Frame butt joints
- Crosscut backsaw
- Table saw using a mitre gauge, crosscut sled, or sliding table attachment.
Reinforced butt joints[edit]
To overcome their inherent weakness, butt joints are usually reinforced by one of the following methods:
Nailed butt joint[edit]
This is the most common form of the butt joint in building construction. Members are brought together and a number of nails are driven in to hold them in place. The technique of skew-nailing is applied so that nails are not parallel to each other and so resist the pulling apart of the joint. This form of butt joint is rarely used in furniture making.
Use for:
- framing in building construction, such as platform framing
- Basic or temporary box/cabinet/frame making
- woodwork toys
Dowel reinforced butt joint[edit]
The dowel reinforced butt joint or simply dowel joint has been a very common method of reinforcing butt joints in furniture for years. They are common in both frame and carcase construction. Dowel joints are popular in chairs, cabinets, panels and tabletops. They are also used to assist with alignment during glue up.
The technique consists of cutting the members to size and then drilling a series of holes in the joint surface of each member. Holes are often drilled with the assistance of a dowelling jig which aids in accurate hole placement — accuracy is paramount in this technique to ensure members line up perfectly in the completed joint. The holes are drilled such that there are corresponding holes in each member into which short dowels are inserted with some glue. The joint is brought together and clamped until the glue has dried.
This produces a joint which is much stronger than a butt joint without reinforcement.[2] The dowels offer some holding strength even after the glue has deteriorated. Over time, dowels may shrink and become loose. They take on an oval shape in section owing to the different rate at which wood moves with different orientations of the grain. Loose dowels allow the joint to flex, although it may not fall apart. This phenomenon is evident in creaking chairs and wobbling book cases. For this reason, dowel joints are not preferred for high-quality furniture.Use for:
- Frame joinery (e.g. face frames, web frames, door frames, table legs to aprons, chair legs)
- Cabinet carcase construction (e.g. carcase sides to top and bottom, fixed shelving/partitions)
- Panel assembly (for alignment)
A variation of the dowel method for reinforcement is the use of a Miller dowel in place of the usual straight cylindrical dowel. The Miller dowel is a stepped dowel and is drilled with a special stepped drill bit. It is drilled from the outside face of the frame piece to be joined and therefore generally leaves an exposed dowel protruding after glue dries, and the excess dowell head is thus usually flush cut. The advantages of the special dowel are documented in various media promoting the method, but one advantage that should not be overlooked is speed of assembly. The butt joint can often be joined temporarily and sometimes more accurately with simply glue, allowing faster set up than the usual tedious alignment procedures mentioned above. After the glue dries one or more Miller dowels are then used to reinforce the joint. Dowel trimming and sanding of the surface, followed by normal finishing then proceed in the usual manner. The blind alignment problems of floating dowels are virtually eliminated by the use of the Miller dowel. Not all projects are appropriate for the stepped dowel method if an exposed dowel end is not visually acceptable, however.
Biscuit reinforced butt joint[edit]
The biscuit reinforced butt joint is a fairly recent innovation in butt joint construction. It is used primarily in carcase and frame construction. The biscuit is an oval shaped piece of specially dried and compressed wood, usually beech, which is installed in matching mortises in both members of the joint in a similar fashion to a loose or floating tenon. Biscuit joints are common in both frame and carcase construction. They are particularly convenient for panel glue ups as they facilitate alignment of panel members.
To create the mortise for the biscuit, a biscuit joiner is usually required. There are other methods of cutting the slot, such as a slot cutter bit in a router, but the biscuit joiner is the most common. Accuracy is not as important in the creation of these mortises as the biscuit joint is designed to allow a bit of flexibility during glue up. The mortise must be located at the correct distance from the face of the joint in both members but the width of the mortise is not as critical.
When the mortises have been cut, the biscuit is inserted with some glue and the joint is brought together, aligned and clamped. The biscuit absorbs some moisture from the glue and swells up in the mortise, creating a tightly fitting joint.
Biscuits are available in a range of sizes for different purposes. It is also common to use more than one biscuit side by side in a joint when members are thick.
Use for:
- Frame joinery (e.g. face frames, web frames, table legs to aprons, chair legs)
- Cabinet carcase construction (e.g. carcase sides to top and bottom, fixed shelving/partitions)
- Panel assembly (for alignment)
- Attaching face frames to cabinets
- Bottom
Screwed butt joint[edit]
The screwed butt joint uses one or more screws inserted after the joint has been brought together. The screws are usually inserted into an edge on the long grain side of one member and extend through the joint into the end grain of the adjacent member. For this reason, long screws are required (usually 3 times the thickness of the member) to ensure good traction. These joints may also be glued although it is not necessary.
In solid timber work it is common to counterbore a hole in the frame or carcase member to conceal the head of the screw. This also allows more of the body of the screw to penetrate the adjacent member for greater traction. After the screw has been driven into the joint, the counterbore can be filled with an appropriately sized piece of dowel or a wooden plug cut from an offcut of the same timber using a plug cutter.
There are also commercial systems available for screwed butt joints in which a plastic cap is provided with the screw to be fixed to the head of the screw after it has been driven home. Counterbores are not required for these fasteners. This system is more common with manufactured board products.
The screwed butt joint is common in both frame and carcase joinery. Modular kitchens make regular use of this fixing method.
Use for:
- Frame joinery (e.g. face frames, web frames, door frames)
- Cabinet carcase construction (carcase sides to top and bottom, fixed shelving/partitions)
Butt joint with pocket hole screws[edit]
This is a variation of the screwed butt joint in which the screws are inserted into pocket holes drilled in the rear face of one of the joint members. The screws extend into cross grain in the adjacent member, so much shorter screws can be used. This method is preferred when the edges of the frame will be visible.
The pocket holes require two drilling operations to be completed. The first is to counterbore the pocket hole itself, which houses the screw head within the member. This hole is stopped 1/4' (5mm) or so from the edge of the frame member. The second step is to drill a pilot hole concentric with the pocket hole which extends through the edge of the member. The pilot hole allows the screw to pass through the member and into the adjoining member. This two stage drilling operation may be performed with two different sized drill bits, however there are special stepped bits available to perform the operation in a single pass. The drilling operation is often facilitated by a pocket hole jig which allows the user to drill the pocket hole at the correct angle and to the correct depth.
Use for:
- Frame joinery (e.g. face frames, web frames, door frames)
- Attaching face frames to cabinets
Knock-down fasteners[edit]
Knock-down fasteners are a hardware device made for the purpose of constructing butt joints that can be assembled and re-assembled repeatedly (hence knock-down). This type of fastener is very popular in flat-pack furniture, which is typified by items such as book cases and wall units that come in a package of pre-cut and pre-drilled components ready to assemble by a novice. They are also very common in modern modular kitchens.
Knock-down fasteners usually consist of cam dowels locked by cam locks, also known as conformat fasteners, installed in adjacent members. The members are brought together and the joint is secured by turning the cam-lock.
Specialist tools and jigs are often required for the repeatable installation of knock-down fasteners (but not for assembly of prefabricated flat-pack furniture), so they tend to be limited to those who are making mass-produced items. However, there are applications in which the hobbyist can benefit from the range of fasteners that are available. They are easier and require less skill to install than some of the other more traditional techniques.
Knock-down fasteners are typically used for carcase joinery; furniture designs using them are usually of frameless construction.
Used for:
- Wide application in cabinet making depending on type of fastener: particularly in carcase construction (e.g. Carcase sides to top and bottom, fixed shelving/partitions, drawer boxes, counter tops to carcase)
References[edit]
- ^'Woodwork - Butt Joint information and Pictures'. www.woodworkbasics.com. Retrieved 2016-06-16.
- ^'How Strong is a Dowel Joint? - Canadian Woodworking Magazine'. www.canadianwoodworking.com. Retrieved 2018-08-06.
External links[edit]
- Creating Butt Joints - DIY advice on choosing and creating Butt Joints.
Info
- Publication number
- US1561463A US1561463AUS699988AUS69998824AUS1561463AUS 1561463 AUS1561463 AUS 1561463AUS 699988 AUS699988 AUS 699988AUS 69998824 AUS69998824 AUS 69998824AUS 1561463 AUS1561463 AUS 1561463A
- Authority
- US
- United States
- Prior art keywords
- blade
- counterbore
- Rochemont Allen C De
- Original Assignee
- Application filed by Rochemont Allen C DefiledPriority to US699988ApriorityApplication grantedgrantedPublication of US1561463ApublicationAnticipated expirationlegal-statusExpired - Lifetimelegal-statusCurrent
- description18
- description5
- description2
- description2
- description1
- description1
- description1
- description1
- description1
- description1
- description1
- description1
- description1
- description1
- description1
- description1
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23B—TURNING; BORING
- B23B51/10—Bits for countersinking
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B51/00—Tools for drilling machines
- B23B51/107—Bits for countersinking having a pilot
Links
Images
Classifications
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Description
Nov. 17, 1925- 1,561,463 A. c. DE ROCHEMONT COUNTERBORE Filed. March 18, 1924 Patented Nov. 17, 1925.
UNITED STATES ALLEN 0. DE BOCI-IEMQNT, or roars vxourn, NEW newsman.
GQ'UNTERBORE.
Applicationfiled March 18, 1924. SerialNol 699,988;
To all whom it may concern:
Be it known thatI, ALLEN C. DE ROCHE: MONT, a citizen of the United States,residing' at Portsmouth, in the county of Rock in'gham and Stateof New Hampshire, have invented new and useful Improvementsin Counterbores, of which the] following is a specification.
As heretofore constructed counterbores have commonly'been provided with integral pilot 'members for engaging within holes formed of the proper'size to receive them beyond thedesired ,counte'rbored portionof the work to insure that the counterbored portions shall be coaxial With the remainder of the holes. Sincethe cutting edgesofthe tool are on its end inwardly of the pilot it has been customary to notch out the pilot adjacent the cutting edges so that the sharpening tool may traverse the full lengths of these cutting edges: This not only weakens the pilot, but as the tool is ground this notch is almost'certain to. be made deeper by the grinding tool, thus further weakening the tool so that breakage may result. The portion of the pilot thus notched also becomes less accurate guiding element as the cutting edges are ground back. For these reasons such tools have usually been rendered useless after comparatively .little stock has been removedby sharpening. Each of these tools, also, is limited to a single size of hole and counterbore since the pilot is integral. withv the cutting portion.
This invention provides aconstruction wherein the objections abovenoted are eliminated, the pilot beinga separate piece from the cutting portion and removable therefrom. Thus the pilot may be removed when the cutting edges of the counterbore portion are to ee-sharpened thus exposing the entire length of each cutting edge to the grinding operation and obviating injury to the pilot.
With this construction, also, pilots of various diameters may be assembled with counterbores of various diameters, thus obtaining a large number of proportions of counterbore to hole diameterwith a comparatively small number oftool parts. The pilots may also be adjusted relative to the cuttingportion to suit various conditions met with in practice, and if desired, they may be formed as workin tools to perform other functions than mere y to guide the counterbore cutting edges.
For a more complete understanding of this invention reference may behadtothe accon panying drawings in whiblk Figure 1 is a side elevation-oi. a counterbore constructed according to this invention.
Figure 2 is'a side elevation of the' end portion thereof, the pilotliaving been re moved:
Figure 3 is a section on line 3-3 of Figure 2'.
Figure 4 member.
Figure 5 is a section on line 5'-5 ofFigure 4:.
Figure 6 shows thepilot made in the form of a' drill'.
Figure? shows the pilot adjusted to form a depth gageforthe counterbore'.
Figure 8 shows a pilot of relatively'l'arge diameter, the counterbored hole beingdiagonal to the surface of the work.
Figure 9 shows the pilot extended to bear within thehole when the counterbored' per.- tion has been cored out.
Figure 10 shows the pilot formed as a rose reamer.
Figure 11 is a side elevation showing a four bladed counterbore.
Figure 12 is a'section on line 12 12 of Figure 11;
Figure 13 shows a modified construction particularly designed forcutting tube holes in boiler tube sheets.
Referring first to Figures 1 to 5, 1 indicates a blademember-having cutting edges 2 formed at one end and a shank- 3 of any suitable form for engagement with driving mechanism at the other. Intermediate the side edges of the blade portion 2a channel 4: is. formed longitudinally on each side thereof and centrally of this channel a slot 5 is cut through this piece.
Inventor Counterbore Slot Kit
The pilot member comprises a cylindrical end portion 6 having a shank 7 extending therefrom slotted out to form a pair of spaced jaws 8, the space 9' therebetween being of sufficient width so that the jaws 8 may engage opposite sides of the blade member sliding within the opposed clannels 4: on opposite sides thereof. Adjacent. to their ends the jaws 8 are perforated, at lO is a side elevation of the pilot for the reception of a tighteningbolt 11 which may extend through the slot 5 and when tightened. clamps the jaws 8 firmlyto the blade member 1 with the cylindrical portion 6 extending beyond the cutting edges 2 as shown in Figure 1. A plurality of pilot members having cylindrical portions 6 of dili'erent diameters may be employed with each blade member 1, the jaws 8 in all these forms being of such size as to fit within the channels 4.
hen it is desired to sharpen the cutting edges 2 the pilot member is removed, whereupon the grinding tool may act on the entire cutting edge which is left freefrom obstruction as will be evident from an inspection of Figure 2. The pilot member may then be assembled with the blade member, the jaws 3 being clamped in position in the channels 1 within which they fit sufiiciently closely so that the pilot portion 6 is in correct axial alinement with the blade portion. By means of the tightening bolt 11 passing through the slot 5 the distance to which the pilot portion 6 extends beyond the cutting edges 2 may be adjusted as may be desired. F or example, it may be adjusted to form a depth gage to determine the depth of the counterbore as is illustrated in Figure 7 in which the pilot portion 6 passes entirely through the work when the counterbore cutting edges 2 have reached their proper depth from the upper face of the work.
The pilot portion 6 may also be extended so that it bears firmly within the guiding hole 21 of work in which the counterbore portion has been cored out as shown in Figure 9 so that the pilot may have bearing within the hole 21 before the cutting edges 2 have begun to act on the work. By this means proper positioning of the counter-e bored hole is insured even though the counterbored portion may be so deep as to make it impossible for the pilot as ordinarily constructed to reach the guiding hole with which the counterbore is desired to be in axial alinement before the edges 2 are brought into action.
In Figure 8 the pilot portion 26 is shown as of a larger diameter than the pilot portion 6 of Figures 1, 4 7 and 9, this illustrating diiferent proportions of counterbored diameter and pilot hole diameter which may be effected by the construction of this invention. This figure also illustrates the manner in which the pilot portion 26 is properly guided within its guide hole diagonally to the face of the work.
In Figures 6 and 10 the pilot is shown a cutting tool instead of merely as a guide member, in Figure 6 this pilot portion 28 being formed as a bit to bore its own hole in the work and in Figure 10 the pilot portion 29 being formed as a rose reamer to enlarge the hole within which it is guided.
In Figures 11 and 12 is shown a construction in which the blade member is provided with four blades each having a cutting edge at its end. These four blades are indicated at 30. In this construction the pilot member has a pilot portion 31 and spaced jaws 32 which engage within the opposite angles between pairs of blades 30, the jaws being. held in clamped position by means of a clamping bolt 33 extending through a slot 34 through the blade member.
Still another embodiment of this invention is the special tool shown in Figure 13, particularly intended for cutting tube holes in boiler tube sheets. As therein shown the guiding pilot portion 35 of the pilot mem ber is of comparatively small diameter, the jaws 36 being much larger and fitting within correspondingly wide channels in the blade member 37. This blade member is extended to form cutting edges 38, intermediate these edges the blade member is cut away as shown. by the dotted line at 39. Each cutting edge 38 is therefore considerably narrower than the distance between its outside diameter and that of the pilot portion 35. p This pilot portion engages within a pilot hole formed within the boiler tube sheet and the blades 38 cut in an annular path coaxial with the pilot 35 through the boiler sheet, thus leaving a central uncut ring or washer portion 39 which drops out. This avoids the necessity of cutting away the entire mass of metal within the desired diameter of the hole for the boiler tube, this representing a material saving in power required to cut the tube holes.
Having thus described certain embodiments of this invention it should be evident to those skilled in the art that various changes and modifications might be made therein without departing from its spirit or scope as defined by the appended claims.
I claim:
1. A device of the class described comprising a blade member having end cutting edges and longitudinally slotted back of said edges, a pilot member slotted from one end to form a pair of jaws to take over said blade member, and means engaging the free ends of said jaws and passing through the slot of said blade member to clamp said pilot member to said blade member in adjustable axial relation.
2. A device of the class described comprising a blade member having axially arranged channels on opposite faces and cutting edges at one end, a pilot member having spaced jaws engaging in said channels and projecting beyond said cutting edges, and means for fixing said jaws in said channels.
3. A device of the class described comprising a blade member having axially arranged channels on opposite faces and slot- 5 ted through a portion of its length within said channels, a pilot member having a substantially cylindrical head at one end and slotted to form a pair of opposed jaws fi.t ting within said channels, and a clamping bolt passing through perforations adjacent a pilot member having a pilot portion at 10 to the free ends of said jaws and through one end and a pair of jaws at the opposite said slot for fixing said pilot member to end formed to engage in said channels, said said blade member in longitudinally adjustpilot and jaw portions being of different able substantially coaxial relation. diameters, and means for fixing said jaws 4. A devlce of the class described coinin position. prlslng a blade member having axially ar- In testunony whereof I have afiixed my ranged channels on opposite faces and cutsignature. ting edges at one end of said blade member, ALLEN C. DE ROCHEMONT. [11. s.]
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US699988AUS1561463A (en) | 1924-03-18 | 1924-03-18 | Counterbore |
Publications (1)
| Publication Number | Publication Date | ||
|---|---|---|---|
| US699988AExpired - LifetimeUS1561463A (en) | 1924-03-18 | 1924-03-18 | Counterbore |
Country Status (1)
| Country | Link | |||
|---|---|---|---|---|
| US2428099A (en) * | 1944-02-18 | 1947-09-30 | Robert H Clark | Cutting tool |
| US4333727A (en) * | 1977-09-23 | 1982-06-08 | Bennett Donald C | Composite rotary tool including hole forming means and a deburrer or chamferer |
| US4512691A (en) * | 1983-05-19 | 1985-04-23 | The Singer Company | Pilot adaptor for flat wood boring bits |
| US6514017B2 (en) * | 2001-03-02 | 2003-02-04 | Deblasio Michael J. | Core drill piloting system |
| US20070147967A1 (en) * | 2005-12-06 | 2007-06-28 | Magnaghi Aeronautica S.P.A. | Method and apparatus for carrying out deep holes and/or bottle-boring |
| US20120082523A1 (en) * | 2009-03-30 | 2012-04-05 | Guehring Ohg | Rotationally driven multi-bevel step tool |
| US9095947B1 (en) * | 2012-05-22 | 2015-08-04 | The Boeing Company | Sensing tip reamer |
Inventor Counterbore Slot Machine
- 1924-03-18USUS699988Apatent/US1561463A/ennot_activeExpired - Lifetime
Cited By (15)
Inventor Counterbore Slot Tool
| Publication number | Priority date | Publication date | Assignee | Title | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| US2613558A (en) * | 1947-10-14 | 1952-10-14 | Gordon C Swenson | Chatterless countersink | ||||||||||||||||||||||
| US4340327A (en) * | 1980-07-01 | 1982-07-20 | Gulf & Western Manufacturing Co. | Tool support and drilling tool | ||||||||||||||||||||||
| US4997322A (en) * | 1989-12-26 | 1991-03-05 | Wells Bobby L | Automobile body reamer tool | ||||||||||||||||||||||
| US7147409B2 (en) * | 2004-03-17 | 2006-12-12 | Wienhold James L | Drill countersink assembly | ||||||||||||||||||||||
| US20070147967A1 (en) * | 2005-12-06 | 2007-06-28 | Magnaghi Aeronautica S.P.A. | Method and apparatus for carrying out deep holes and/or bottle-boring | ||||||||||||||||||||||
| US20100247259A1 (en) * | 2009-03-26 | 2010-09-30 | Rick Davidian | Drill bit | ||||||||||||||||||||||
| US8353645B1 (en) * | 2010-04-13 | 2013-01-15 | Laun Craig M | Counterbore bit | ||||||||||||||||||||||
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