2D Drawing Representation Questions

Manufacturing terminology — exterior blends Which term denotes a rounded exterior blend between two surfaces on a part drawing or CAD model?

Preventing rotation on shafts — attachment features Which combination is commonly used to attach parts to a cylindrical shaft so they do not rotate relative to it?

Hole features — naming the conical recess What is the correct term for a conical-shaped recess around a hole, most often used to seat a flat or oval head (tapered) screw flush with a surface?

Edge treatments on cylindrical parts — ease of handling and assembly Which term describes an angled surface applied to the end edge of a cylinder to remove the sharp corner and make handling or insertion easier?

Attachment features — identifying protrusions Which term refers to a flat or rounded tab that protrudes from a surface, usually provided to allow attachment by bolts or other fasteners?

Machine elements — protective sleeves and guides Which term denotes a hollow cylindrical component commonly used as a protective sleeve, guide, or plain bearing between a shaft and housing?

Terminology check in 2D representation: Is a keyway a circumferential groove cut around the diameter of a shaft, often where it changes diameter, or is that description incorrect for a keyway?

Conventions for small blends: Are “runouts” used as small curves to depict how fillets blend into plane surfaces that are tangent to cylinders in orthographic views?

Sheet layout reality: Is it true that, due to space and clarity constraints, it is not always possible to keep every orthographic view strictly aligned on a single drawing sheet?

Handed parts: Are right-hand and left-hand parts mirror images that are intended to be interchangeable, or are they opposite-handed and therefore not interchangeable?

2D Drawing Representation — Definition Check In technical drawing terminology, is a counterbore defined as a cylindrical recess around a hole that is machined to seat a bolt head or nut flush below the surface, typically specified by symbol, diameter, and depth?

Edges and Intersections — Concept Check When a curved surface meets a plane surface on a part, does their intersection create a real edge line that should be represented in orthographic views when it is visible?

Conventional Breaks and Symbols — Economy and Clarity May simplified conventional representations that deviate from exact orthographic geometry be used on drawings to improve clarity and speed, provided the meaning is standardized and unambiguous?

Edges on Contoured Surfaces — Representation Rule If a plane cuts a contoured surface on a part, should a line representing their real intersection be drawn on the view when it is visible, rather than omitting any edge entirely?

Feature Terminology — Boss on a Part In mechanical terminology, is a boss a short raised protrusion that stands proud of a part surface, often used to provide extra thickness for a hole, thread, or bearing seat?

Planes and Contours — Contact Possibilities Is the claim that a plane surface cannot intersect or be tangent to a contoured surface accurate, or can a plane both intersect and be tangent depending on geometry and positioning?

Feature Terminology — Lug vs Flange vs Boss Is a lug best described as a flattened collar or rim around a cylindrical part for attachment, or is a lug more correctly an ear like projection used for fastening, distinct from a flange or boss?

Surface Textures — Knurl Function and Representation Is knurling a patterned texture formed on a surface to improve grip or provide additional surface area for press fits, adhesives, or decorative cues, typically shown by a conventional symbol on drawings?

Fillet vs Round — Interior and Exterior Blends Is a fillet correctly defined as a rounded exterior blend between surfaces, or is a fillet specifically an interior concave blend while the exterior convex blend is called a round?