Pattern Development II: Radial Line and Triangulation
Transitions, cones and offsets laid out by radial line and triangulation, followed through a second-year apprentice at a Halifax sheet metal contractor: true lengths, right and oblique cones, panelled copper roofs, concentric and eccentric reducers, true-length diagrams, on-centre and offset square-to-rounds, rectangular transitions, boots and branch fittings, calculated and software layout, and a capstone copper turret cap and air handler transition.
SMW-210 12 lessons · 3 h 40 min ▶ Video lessons coming soon
Offered by HSM University · Sheet Metal
This is the Canadian version of this course. See the American version.
What you'll learn
- Choose parallel line, radial line or triangulation for a fitting from the behaviour of its element lines, and find the true length of any line by revolution, a true-length diagram or the right triangle
- Develop the full pattern of a right cone or pyramid from its slant height and sector angle, and divide a large cone into panels that suit the sheet, the forming and the design
- Develop concentric reducers and other frustums by the apex method, and by chords and offsets when the apex is out of reach, with mean-line corrections and concentric end allowances
- Develop cones cut by sloping planes, oblique cones and cones meeting pipes, finding each element's true length and building patterns by triangles around the apex
- Divide a surface into triangles, build complete true-length diagrams, name points systematically and develop patterns in order from two known points at a time
- Develop on-centre square-to-round and rectangle-to-round transitions in two mating halves, and check them by perimeters, chord shortfall and the right-angle test
- Develop offset and oblique square-to-round transitions, assigning round points to corners correctly, giving each line its own rise and dividing tilted rounds in their true view
- Develop concentric, flat-on-one-side and offset rectangular transitions and offsets, splitting warped panels into triangles and checking finished fittings for squareness and twist
- Develop eccentric and offset round-to-round transitions by triangulation between two circles, and recognize when the radial line apex method is quicker
- Develop register boots, angle boots, boot tees, breeches and conical tees, and size boot necks and branch entries for good air flow
- Produce calculated patterns by the ordinate method and in numbers, test spreadsheets, scripts and pattern software against hand patterns, and check machine output
- Plan, calculate, lay out, form, check and record a panelled copper cone and a square-to-round transition from field-verified dimensions
Course content
12 lessons · 3 h 40 min total · final exam
- 1 Radial line principles and true length 19 min · quiz
- 2 Right cones and full cone patterns 18 min · quiz
- 3 Frustums and concentric reducers 18 min · quiz
- 4 Oblique and truncated cones 18 min · quiz
- 5 Triangulation principles and true-length diagrams 18 min · quiz
- 6 Square-to-round transitions 19 min · quiz
- 7 Offset and oblique square-to-round transitions 18 min · quiz
- 8 Rectangular transitions and offsets 17 min · quiz
- 9 Eccentric round-to-round transitions 17 min · quiz
- 10 Boots, tees and branch fittings by triangulation 18 min · quiz
- 11 Computer-aided and calculated layout 20 min · quiz
- 12 Capstone: a copper turret cap and an air handler transition 20 min · quiz
- E Final exam 20 questions
Requirements
Recommended background. You can start any course at any time.
Description
Transitions, cones and offsets laid out by radial line and triangulation, followed through a second-year apprentice at a Halifax sheet metal contractor: true lengths, right and oblique cones, panelled copper roofs, concentric and eccentric reducers, true-length diagrams, on-centre and offset square-to-rounds, rectangular transitions, boots and branch fittings, calculated and software layout, and a capstone copper turret cap and air handler transition.