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Engineering graphics and design presentation
A helix is a curve formed by a point moving along a fixed straight line while revolving around a fixed axis in a plane perpendicular to the straight line. The document provides an example of drawing a basic helix with a 120mm pitch and 35mm radius by dividing a circle into 12 equal parts, projecting the pitch vertically from each part, and connecting the intersections to form the helix curve.
Engineering graphics and design presentation
- 1. An introduction toLOCI (helix)
- 2. It isa locus of a point either inside or outside a circumference of a rolling circle without slipping or sliding along a fixed straight line or a fixed circle.
- 7. Example Drawinga basic helix with a: 120mm pitch Radius = 35mm
- 8. • Using acompass, neatly draw a circle with a 35 mm radius
- 9. • Divide thecircle into 12 equal parts. • Number each point
- 10. • Project thepitch • Measure 120 mm as seen on the image
- 11. • Project aconstruction line for each division of the circle
- 12. • Divide thepitch into 12 equal parts as well. • Project vertical lines from each division
- 13. • Plot wherethe vertical line 1 and horizontal line 1 meet. • Do this for the other points (i.e. until point 12) • Draw a neat line joining all the intersections
- 14. 90mm Pitch Radius 35mm RightHand Direction
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