X - aperture width of stairs Y - The height of the opening W - Width of stairs F - Ledge steps C - Number of steps Z - The thickness of the steps H - Height treads over bowstring A - The thickness of a bowstring B - Supports thickness D - distance for mounting supports U - the angle of the supports to the vertical
SP - Determine the position of the first degree relative to the level of the floor of the second floor. LR - Set the direction of the lift. For the drawing steps.
Features of the program.
Calculation of convenient metal ladder to the second floor.
Determining the amount of material.
The exact dimensions of all the parts.
Detailed drawings and schematics of all elements of the metal stairs.