Helicoid flat pattern
What it is
The helicoid is the flat helix — the flight of a screw conveyor. Each turn is developed as a ring with a gap: stretched and twisted, the ring rises exactly one pitch. The calculation returns the outer and inner radii of that ring and the gap required.
Where it is used
Screw conveyors and augers, mixers, silo feeders, grain and bulk material handling.
Measurements the calculation needs
- D Diameter
- X Measurement X
- P Displacament P
- THK Thickness
Worked example
The values the form comes pre-filled with, run through the tool itself:
| Diameter | 100 mm |
|---|---|
| Measurement X | 200 mm |
| Displacament P | 250 mm |
| Thickness | 10 mm |
| The flat pattern fits a plate of | 238 × 238 mm |
Frequently asked questions
- What is the pitch?
- The distance the helix advances along the axis in one full turn. It sets the gap in the ring: the greater the pitch, the wider the gap.
- Why does the ring have to be cut open and twisted?
- Because a flat, closed ring does not rise. Opening the calculated wedge and pulling the ends in opposite directions lets the material follow the helix without stretching.
