- Slot Dimension Callout
- How To Dimension A Countersunk Slot Machine
- Slot Dimensions Standards
- Proper Way To Dimension Slots
- How To Dimension Countersunk Hole
A counterbore in a metal plate
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Dimensions of Slotted Flat Countersunk Head Machine Screws Nominal Size or Basic Screw Diameter L A H J T F G These Lengths or Shorter are Undercut Head Diameter Head Height Slot Width Slot Depth Protrusion Above Gaging Diameter Gaging Diameter Max Edge Sharp Min Edge Rounded or Flat Ref Max Min Max Min Max Min. Thin line used to extend the shape of the object to the dimension line How to write a note on fillets & rounds: ALL FILLETS & ROUNDS Rradius UNLESS OTHERWISE SPECIFIED. The space between the first dimension line and the object should be at least ¾ inch (10 mm). The space between dimension lines should be at least ¼ inch (6mm).
A counterbore (symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature. A counterbore hole is typically used when a fastener, such as a socket head cap screw, is required to sit flush with or below the level of a workpiece's surface.
How To Dimension A Countersunk Slot Machine
It is also important to consider standard dimensions for countersinks. Countersink Dimensions. You have a lot to think about: The angle of the opening; The large diameter of the hole that the screw fits into, and; The small diameter that ultimately allows the screw thread to fit snugly into the sheet metal; Two Ways to Create a Countersink.
Whereas a counterbore is a flat-bottomed enlargement of a smaller coaxial hole, a countersink is a conical enlargement of such. A spotface often takes the form of a very shallow counterbore.
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As mentioned above, the cutters that produce counterbores are often also called counterbores; sometimes, to avoid ambiguity, the term counterbore cutter is used instead.
Description[edit]
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Comparison of countersunk and counterbored holes.
Counterbore cutter marked 'E
A counterbore hole is usually used when the head of a fastener, such as a hex head or socket head capscrew, is required to be flush with or below the level of a workpiece's surface.
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For a spotface, material is removed from a surface to make it flat and smooth, usually for a fastener or a bearing. Spotfacing is usually required on workpieces that are forged or cast. A tool referred to as a counterbore is typically used to cut the spotface, although an endmill may also be used. Only enough material is removed to make the surface flat.[1]
A counterbore is also used to create a perpendicular surface for a fastener head on a non-perpendicular surface. If this is not feasible then a self-aligning nut may be required.
![How To Dimension A Countersunk Slot How To Dimension A Countersunk Slot](/uploads/1/2/5/2/125276642/489809990.jpg)
By comparison, a countersink makes a conical hole and is used to seat a flathead screw.
![Slot dimension callout Slot dimension callout](/uploads/1/2/5/2/125276642/949666835.jpg)
San pedro del fuerte medellin. Standards exist for the sizes of counterbores, especially for fastener head seating areas. These standards can vary between corporations and between standards organizations. For example, in Boeing Design Manual BDM-1327 section 3.5, the nominal diameter of the spotfaced surface is the same as the nominal size of the cutter, and is equal to the flat seat diameter plus twice the fillet radius. This is in contrast to the ASME Y14.5-2009 definition of a spotface, which is equal to the flat seat diameter.
Machining[edit]
Two types of counterbore tools
Counterbores are made with standard dimensions for a certain size of screw or are produced in sizes that are not related to any particular screw size. In either case, the tip of the counterbore has a reduced diameter section referred to as the pilot, a feature essential to assuring concentricity between the counterbore and the hole being counterbored. Counterbores matched to specific screw sizes generally have integral pilots that fit the clearance hole diameter associated with a particular screw size (e.g., .191 inches for a number 10 machine screw). Counterbores that are not related to a specific screw size are designed to accept a removable pilot, allowing any given counterbore size to be adapted to a variety of hole sizes. The pilot matters little when running the cutter in a milling setup where rigidity is assured and hole center location is already achieved via X-Y positioning.
The uppermost counterbore tools shown in the image are the same device. The smaller top item is an insert, the middle shows another three-fluted counterbore insert, assembled in the holder. The shank of this holder is a Morse taper, although there are other machine tapers that are used in the industry. The lower counterbore is designed to fit into a drill chuck, and being smaller, is economical to make as one piece.
See also[edit]
Notes[edit]
References[edit]
How To Dimension Countersunk Hole
- Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003), Materials and Processes in Manufacturing (9th ed.), Wiley, ISBN0-471-65653-4.
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