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### GDT.pptx

1. Geometric Dimensioning and Tolerancing (GD&T)
2. What is Geometry? Geometry is a branch of mathematics that studies the sizes, shapes, positions angles and dimensions of things. WHAT IS DIMENSIONS? Dimension, in common parlance, the measure of the size of an object, such as a box, usually given as length, width, and height. In mathematics, the notion of dimension is an extension of the idea that a line is one-dimensional, a plane is two-dimensional, and space is three-dimensional.
3. TYPES OF Dimension ? *2D Flat shapes like squares, circles, and triangles are a part of flat geometry and are called 2D shapes. 2D shapes are shapes with two dimensions, such as width and height. An example of a 2D shape is a rectangle or a circle. 2D shapes are flat and cannot be physically held, because they have no depth; a 2D shape is completely flat.
4. *3D Solid objects are also known as 3D objects having the third dimension of height or depth. 3D (or 3-D) means three- dimensional, or having three dimensions. For example, a box is three-dimensional; it is solid, and not thin like a piece of paper. The three dimensions are often called length (or depth), width (or breadth), and height.
5. WHAT IS TOLERANCE? We Can’t Do A Product 100% Exact Size But We Can Very Close The Size. The Difference Between The Maximum And Minimum Dimensions Of Permissible Errors Is Called The "Tolerance." The Allowable Range Of Errors Prescribed By Law, Such As With Industrial Standards, Can Also Be Referred To As Tolerance.
6. INDIVIDUAL (No Datum Reference) INDIVIDUAL or RELATED FEATURES RELATED FEATURES (Datum Reference Required) GEOMETRIC CHARACTERISTIC CONTROLS TYPE OF FEATURE TYPE OF TOLERANCE CHARACTERISTIC SYMBOL SYMMETRY FLATNESS STRAIGHTNESS CIRCULARITY CYLINDRICITY LINE PROFILE SURFACE PROFILE PERPENDICULARITY ANGULARITY PARALLELISM CIRCULAR RUNOUT TOTAL RUNOUT CONCENTRICITY POSITION FORM PROFILE ORIENTATION RUNOUT LOCATION 14 characteristics that may be controlled
7. MACHININGPROCESS
8. MACHININGPROCESS Machining is a prototyping and manufacturing process that creates a desired shape by removing unwanted material from a larger piece of material. Since a part is built by taking away material, this process is also known as subtractive manufacturing. For information on additive manufacturing
9. What are different types of machining? Various machining techniques have been around for decades, but most fall into three principle processes each requiring a specific tool and experienced machinist. They are: •Turning- Turning or Lathing involves rotating the workpiece on a machine, while a single-edged cutting tool remains stationary. The cutting tool is slowly moved parallel to the workpiece’s rotational axis, removing material as it goes. •Drilling - Drilling results in creating a round hole by rotating a cylindrical tool parallel to the workpiece’s axis of rotation. The hole created is equal in diameter of the tool that was used. •Milling - Milling is the process of removing material, using rotary cutters, from a workpiece in a feed motion perpendicular to the rotational axis of the cutting tool. This is one of the most common forms of machining used today.
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