|Carpentry for Vocational Schools - A Teachers Handbook|
a) Gauging the "nosing line": - The nosing line is gauged 40 mm below the stringer-top with a combination square.
b) Gauging the "setting out line":
- On a steel square, you mark the depth of the going on the blade and the height of the rise on the tongue.
- The steel square is placed with the rise and the going position on the nosing line. Then measure the depth of the nosing in a right angle from the nosing line and mark it.
- Also the setting out line is gauged with a combination square along the stringer.
c) Marking out the "face-lines" of tread and riser: - A fence is now attached to the steel square. The riser height and the tread depth-marks on the square must be placed on the setting out line. The fence enables tread and riser lines to be repeated accurately. The face-lines of tread and riser are marked out by sliding the square along the stringer.
d) Marking out the thickness of tread and riser:
- This is done with templates made of plywood with the exact thickness and width of riser and tread.
- The tread-template is held below the face-line of the tread with the corner meeting the nosing line.
- The riser-template is held inside the face line of the riser meeting the bottom line of the tread.