Machine drawing - From scratch to become a master

Explore screw thread nomenclature by distinguishing internal and external threads, and understand pitch diameter, major and minor diameters, and pitch for holes and shafts.

Examine the main thread profiles in machine drawing, including metric threads with internal and external forms, Whitworth and buttress threads, square threads for load bearing, and Acme variants.

Explore left hand and right hand threads, and how a coupler nut interacts with a coupler shaft to rotate, separate, or join components through internal and external threads.

Learn to draw a hexagonal nut from scratch by constructing the plan and front elevation, using major diameter d and 1.5d plus three spacing, with a regular hexagon.

Explains hexagonal and square headed bolts, their threaded portions, head shapes, and the basic nomenclature of threads and fasteners for drawing and interpretation.

Prevent shaft loosening on rotating assemblies by applying locking arrangements, including lock nuts, lock plates, and spring washers that bind the shaft and nut together.

Foundation bolts anchor machinery to concrete using bent and band foundation boards to resist heavy tensile and compressive forces. Also cover rag foundations and friction bearing surfaces.

Learn how keys secure a shaft to a pulley by fitting into grooves and transmitting torque, covering sunk, saddle, and round key types.

Explore gib head and peg keys, single and double headed keys, and the splined shaft with Woodruff key, including key dimensions and assembly sketches for transmitting torque.

explain socket and spigot joint and cotter joint with sleeve, and gib along with a cotter, to transmit torque between shafts using sleeves and a common bush to reduce slip.

Study the knuckle joint through orthographic projections, drawing the connecting pin, fork, and central axis, and set dimensions using D to clarify the mechanism.

Illustrate the knuckle joint in a three-dimensional view, showing forks, a central hole, and a connecting pin fitting the hollow region; a split pin locks backward movement.

Explore the design and function of muff couplings and half-lap muff couplings, including keys, mouths, and overlap geometry, with orthographic projections and dimensional details.

Explore the split muff coupling in machine drawing, detailing its two-halves construction, recesses, bolts, and orthographic projections, with practical dimensioning guidance.

Learn how to connect two shafts with flanged couplings, including solid flange and protected flange variants, using bolts, tapered bolts, and wedging action to transmit torque.

Explore claw coupling as a positive, non-slip method for transmitting high torque between shafts, featuring three projections, shaft diameters, and 60-degree angles that ensure no slippage.

Explore Oldham's coupling, featuring a connector plate with horizontal and vertical slots, and a three-part assembly that transmits rotation between two shafts via an intermediate plate.

Universal coupling in automobiles joins non-coaxial shafts, absorbing angular deviations; it uses an intermediate connector and a kingpin to link three parts.

Visualize and assemble a cast iron flange joint between two pipes. Include flange faces, bolts, nuts, gasket gap, and pitch circle diameter with millimeter dimensions.

Learn to draw a socket and spigot pipe joint, establish the axis, depict the socket end and spigot, and illustrate molten lead sealing with rubber cushioning.

Examine riveted joints by detailing rivet head, shank, tail, and taper, and study lap joints, pitch, diameter, and plate thickness in two-plate cross-sectional views.

Explore different rivet head types, including snap/cup, conical pan, countersunk, parabolic, ellipsoid, and spherical heads, and understand their key dimensions related to D and d.

Explore the single riveted lap joint, including plan and elevation drawings, sectional view, and key dimensions such as rivet diameter, pitch, overlap length, and plate thickness.

Describe and dimension a double riveted chain lap joint using plan and cross-sectional views, specifying rivet diameter, pitch, columns, and overlap length.

Execute a double riveted zigzag lap joint by detailing rivet diameter D, overlap length L, and successive radial pitch P_r, with cross-section and elevation views of two overlapping plates.

Explore riveted butt joints in machine drawing, detailing single strap and double strap configurations, end-to-end plates, strap alignment, and rivet layout with pitch and cross sections.

Explore the diamond butt joint by detailing rivet layouts, top view, and elevation, explaining giant tolerances and load distribution in heavy structures.

Explore welding joint types and their symbols, including butt joints, single and double V, single and double U, W joints, bevels, J joints, plate preparation, and spot welding.

Explore the three bearing categories—general, journal, and thrust (ball) bearings—and how force distribution differs among them, then learn solid bearing construction, essential dimensions, and wear-driven replacement.

Explain the construction of a bushed bearing, including brass bush and oil hole. Show how a grub screw secures the bush, allows replacement without replacing the shaft, and reduces friction.

Explain the construction of a plummer block, detailing the cast iron pedestal and cap, shaft, brass or gunmetal bushings, washers, nuts, and fastening bolts, with a half-section and three-dimensional views.

Demonstrate stuffing box assembly by detailing the body, gland, brass bush, and start bolts with nuts; present their top, sectional, and isometric views and a bill of materials.

Learn to assemble a piston for an internal combustion engine, including piston, piston pin, piston pin plug, piston rings, and the connecting rod with top, cross-sectional, and side views.

Explore the single tool post assembly by detailing its pillar, block, ring, bridge, wedge, and screw components, with sectional views, dimensions, and material notes.

Learn to create a complete single tool post assembly drawing, from pillar and block to ring, weight, and screw, including isometric and sectional views with a vertical slot.

Sketch and assemble a square post tool holder from scratch, detailing its front elevation and top view. Explore the base plate, stand, clamping neck, handle, screws, spring, and ball components.

Showcases the square tool post assembly, detailing the baseplate, tool holder, grub screws, set screws, and spring-loaded ball alignment, guided by the assembly diagram.

Explore screw jack parts from scratch, including the body, the nut, and the screw, detailing square-thread construction, internal features, and cross-section views to illustrate load-bearing design.

Assemble the screw jack by aligning the body, nut, square threads, and washer to form the final assembly. Use the tommy bar to lift a vehicle and replace a tire.

Explore the pipe vise design with front, top, and side views, detailing hollow, threaded, and locking features, plus dimensions for a cast iron base and movable jaw.

Learn to assemble a pipe vice from its body, base, and movable jaw, including handlebar, screw rod, squared plates, and set screws, to fixture pipes for cutting or drilling.

Present an assembly drawing of a C clamp, detailing the frame, fixed platform, movable jaw, cross sections, square-thread screw, and the pad and tommy bar.

Develop a complete connecting rod assembly drawing from the given parts, including top and full sectional views, part list, materials, and clear dimensioning.

Identify parts of the connecting rod assembly and create detail drawings from the assembly, including the rod portion, cap, bolts, nuts, bearing components, and the crankshaft interaction.