Chapter 5: Convention Practice in Orthographic Writing

Convention applied during drawing to represent holes, ribs, and other features on a surface, ensuring a consistent and clear view.

A view of a specific part of an object where the details are enlarged for increased clarity

A line used to represent the intersection of surfaces that would be hidden by fillets and rounds if they were present.

A commonly accepted practice in orthographic projection that deviates from strict rules to improve readability and clarity.

A variation of the standard side view placement that aims to save space and improve clarity, especially when an object has a small height and large depth.

A side view that omits features that are obstructed or cannot be clearly seen from the chosen viewing direction.

A representation of an object where only a portion is shown, revealing hidden details.

A side view where half of the object is cut away to reveal its internal structure.

A zoomed-in view of a specific area of an object, highlighting a detail.

A view that presents the most visible side of an object, typically showcasing its primary features.

The practice of creating a visual representation of an object based on its projection onto a flat surface.

The unit of measurement for length dimensions in JIS and ISO standards is millimeters, represented without the unit symbol "mm".

Angular dimensions are measured in degrees, denoted by the symbol "°" following the numerical value. Minutes and seconds can be used if necessary.

Dimension figures are aligned so that they are readable from the bottom and right side of the drawing.

Dimension figures are placed to be readable from the bottom of the drawing only.

Dimensioning is the process of adding size and location information to a drawing, making it possible to manufacture an object.

Local notes provide additional information about specific features of an object and are positioned outside the view, near the feature they refer to.

Dimension figures should always be placed so that they are read horizontally.

Avoid placing dimension lines too far from the feature they are referring to.

The process of providing essential details about a part using numbers, symbols, and annotations.

A line extending from the object to indicate the point being dimensioned.

A line with arrows indicating the direction and length of a measurement.

A line with an arrow at one end connecting to a feature and a note on the other end.

Numbers written on dimension lines showing measurement values.

A system using millimeters and decimal points for numbers, aligning with international standards.

The practice of specifying details such as size, location, material, surface finish, and manufacturing processes.

The placement of dimension lines and figures should be clear and organized for optimal readability.

Dimensions that define the size of a feature, such as width, depth, and thickness. They describe the physical extent of the part.

Dimensions that specify the position of a feature relative to other features on the part, such as holes and edges.

A dimension used to represent angles, using a circular dimension line with the center at the angle's vertex.

A dimension used for arcs, giving the radius of an arc. Often labeled with the letter 'R'.

The dimension line connecting the feature to the dimension value should be radial to the arc, with an angle between 30 and 60 degrees.

A special method for dimensioning an arc when the arc center falls outside the drawing sheet or overlaps other features.

A note added to the drawing to indicate the radius of a fillet or round, often used when all fillets and rounds are the same size.

A note on the drawing used to designate the radius of fillets and rounds when various sizes are used. It ensures consistency and avoids repetitive dimensioning.

A curve created by joining two or more arcs. Requires information about the radii and location of the centers.

A three-dimensional object with circular ends and a uniform diameter along its length.

The diameter is measured in the longitudinal view, with the symbol '' placed before the value.

Circular features with a defined diameter and depth. Location is specified from centerlines.

Holes with a smaller diameter are often shown in the circular view using a leader line and a note indicating the diameter and depth.

Holes extending entirely through the thickness are called 'Thru' holes.

Holes that stop before reaching the other side are 'Blind' holes, with a specific depth.

Large holes may be dimensioned with extension lines, a diametral dimension line, or a leader line and note.