Stairmaking - Course: Timberwork techniques. Instruction examples for practical vocational training (Institut für Berufliche Entwicklung, 34 p.): Instruction Example 8.3.: Scribing of landing connections

Stairmaking - Course: Timberwork techniques. Instruction examples for practical vocational training (Institut für Berufliche Entwicklung, 34 p.)

		(introduction...)
		Preliminary Remarks
		Instruction Example 8.1.: Taking off Dimensions at the Stairwell
		Instruction Example 8.2.: Determination for the Ratio of Rise and Tread
		Instruction Example 8.3.: Scribing of landing connections
		Instruction Example 8.4.: Manufacture of Template and Angular Board
		Instruction Example 8.5.: Scribing and Preparing the Stair Strings
		Instruction Example 8.6.: Manufacture of Steps and Risers
		Instruction Example 8.7.: Assembly of the Stair Flight

Instruction Example 8.3.: Scribing of landing connections

Details assumed to be known:

Stairwell length without landing: 2200 mm

Stairwell height = stair flight height: 1620 mm

Ratio of rise and tread

Number of rises n_s = 9

Step thickness: 35 mm

Riser thickness: 15 mm

False tread: 30 mm

Floor thickness d₁ = d₂ = 24 mm

Cross-section of stair-aprons = 140/180 mm²

Figure

Measuring and testing means

Folding rule, square

Auxiliary accessories

Straight batten for scribing of about 1300 mm length,
Straight batten for scribing step thickness, about 350 mm long and exactly 35 mm wide!

Necessary previous knowledge

Measuring, scribing, angling, testing

Explanations to the working drawing

The landing connections have been drawn on the drawing floor so as to show the surfaces of the stair foot (bottom step) and stair head (head step) on a joint horizontal line.

(1) landing connections drawn on the drawing floor

(2) details of bottom landing

(3) details of stop landing

St - gauge size, hw - string height

Sequence of operations	Comments
1. Draw a horizontal line on the drawing floor.	Draw a thin line over the entire drawing floor.
2. Determine the front edge of the top landing-apron and draw a vertical line downward.	Mind the stair flight direction! Apply the square exactly.
3. Measure-in the floor thickness d₂.	Measure from 1 downward. Draw the line to 2 only.
4. Measure-in from 1 downward and scribe two heights of rise.	Draw thin lines.
	Draw line 4.1 as long as 1 and parallely to 1. Lines represent surfaces of the steps.
5. Measure-in and scribe difference (40 mm).	Measure from 2 towards stairwell. Draw a thin line downward parallely to 2. Line represents top stair string section.
6. Measure-in from 5 and scribe two tread widths.	Draw a thin line parallely to 5.
7. Measure-in and scribe the step thickness.	Use batten (35 mm width). Apply batten in true alignment- (Batten is still to be used for scribing the stair strings!)
8. Measure-in and scribe the false tread.	Represents the front edge of the steps to be built in.
9. Measure-in and scribe the riser thickness.	Measure from 5 and 6 towards the stair-apron. Draw thin lines, not too long.
10. Draw dash-line over front edges of steps.	Draw very thin dash-line, which is only used for measuring-in the string top.
11. Draw dash-line over lower edges of risers.	Draw very thin dash-line, which is only used for measuring-in the string bottom.
12. Measure-in string top and scribe lower edge of stair string	Make sure it is parallel to 10. Line may be drawn slightly thicker.
13. Measure-in string bottom and scribe lower edge of stair string.	Make sure it is parallel to 11 and 12. The stair string height can be measured between 12 and 13!
14. Determine front edge of bottom stair-landing and drawn a line vertically downward.	Any distance from 2 may be selected. Draw a thin line.
15. Measure-in and scribe floor thickness d1.	Measure from 4.1 downward, draw a thin up to 14.
16. Measure-in and scribe false tread.	Draw a thin, short line.
17. Measure-in and scribe tread width.	Measure from 14 towards stair-well.
18. Measure-in and scribe riser thickness.	Measure from 17.
19. Measure-in string top and scribe upper edge of stair string.	Angle of inclination can be found by means of parallel displacement or gauge size (St)! Use the square!
20. Measure-in and scribe lower edge of stair string.	Measure h_w, from 10 downward! Use the square
21. Check again accuracy to size!	Correct, if necessary! 21 is not shown!
22. Limit stair string at bottom landing.	Any size but bigger than or equal to 50 mm!

Scribing of Landing Connections