Kite Winder Tread
By Huu Khanh Nguyen · Updated October 28, 2026 · stair, tread
One winder step of a quarter turn in a square stairwell, cut to the wall and around the newel post.
Parameters
| Name | Default | Unit |
|---|---|---|
| Well Side (stair width) | 900 | mm |
| Newel Post Side (square) | 90 | mm |
| Winders In The Quarter Turn | 3 | |
| Winder Index (0 is the first step of the turn) | 1 | |
| Thickness | 25 | mm |
| Front Edge Radius | 6 | mm |
| Turn Direction | left | |
| Finish | white | |
| Tread Width At The Post (readout) | ((s) => newelSize * (s(90 * (index + 1) / winders) - s(90 * index / winders)))((t) => t <= 45 ? Math.tan(t * Math.PI / 180) : 2 - Math.tan((90 - t) * Math.PI / 180)) | mm |