- How To Dimension Countersunk Hole
- How To Dimension A Countersunk Slot Machines
- Slot Dimensions Standards
![Countersunk Countersunk](/uploads/1/2/5/6/125685863/474930503.jpg)
A counterbore in a metal plate
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.
Heads up poker big blind dealer. In the heads-up showdown (two players left), the dealer is still the advantaged position because the dealer only has the small blind committed at the outset of the hand, whereas the other player is already in with the big blind. Thus, even though the dealer 'goes first' technically, it is the other player who has effectively 'gone first. Aug 10, 2006 Ive visited numerous websites on this topic and a few of them say that the dealer or button is dealt first card in heads up play for NLHE.and other sites say the non-dealer is dealt first card.what is correct? Jul 22, 2011 I was a certified poker dealer instructor over 30 years ago in Las Vegas, and I still teach on-line. This is the first time I have ever read anything that supports the idea of dealing to the button first. I will stand by the only method I've every seen, and the only. Aug 23, 2008 The other answer is correct. In heads up play, the dealer is always the small blind. The reason is so that one person doesn't have a positional advantage during the entire hand. Preflop, the dealer acts first, and then after the flop the dealer acts last. Sometimes it's confusing when a tournament goes from 3 to 2 players. Proper Preflop Head-Up Blinds Setup: Heads-up Button Position and Dealing: The button has the small blind when playing Texas Holdem heads up. The person who is the dealer has the button and also posts his/her small blind. This means that the other player (without the button) is the big blind.
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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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Use #799 three flute countersink or zero-flute CSK style countersink in portable hand-held power tools. Q: Why are combined drill and countersinks often called 'center drills'? A: Combination drill and countersinks are often used for producing the center-holes in components or workpieces which require machining between centers (eg. Aug 16, 2015 Hole Feature is used to create a hole on the surface of a structure whereas Countersunk Hole feature is used to create a hole in two regions.one is the top region and the other is bottom region. 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 problem with baseline dimensioning is obvious in Figure 4; its take up a lot of space on the drawing. Figure 4 Ordinate dimensioning. A common alternative to baseline dimensioning is ordinate dimensioning, also known as rectangular coordinate dimensioning without dimension lines. This scheme also relies on a baseline, referred to as zero (0), from which all of the features are dimensioned. Dimensions of width, height and depth are shown in the front, right side and top views. The location and size of all features such as, holes, slots etc. Must be shown in the proper view. Dimensions must be shown properly to allow fabrication of the part. Group Dimensioning. Group dimensions as shown in figure A below. Anyone know of a good way to create a slotted countersunk hole? Question asked by William Cheek on May 25, 2010 Latest reply on May 26, 2010 by William Cheek. Try cutting a slot offset with draft in one direction and though all in the other direction? See the reply in context. No one else had this question.
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]
![How How](/uploads/1/2/5/6/125685863/337143663.png)
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.
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 Countersunk Hole
By comparison, a countersink makes a conical hole and is used to seat a flathead screw.
How To Dimension A Countersunk Slot Machines
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]
- Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003), Materials and Processes in Manufacturing (9th ed.), Wiley, ISBN0-471-65653-4.
Slot Dimensions Standards
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