Clarke CONTRACTOR 6462120 Instrukcja obsługi i konserwacji - Strona 4
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Other equipment required for use with this jig
Hand Router capable of taking a 22mm dovetail cutter
+ standard 30mm guide bush.
Minimum of 2 'G' clamps.
For closed staircase:-
16mm cutter for 22mm & 25.4mm treads.
22mm cutter for 28.1mm & 32mm treads.
(only use 95º dovetail cutters - see diag opposite).
Added option to use a 30mm template
guide to produce 38mm nose.
For open staircase:-
30mm guide bush.
16mm straight cutter.
Before commencing, 3 key features that need assessing.
1.
The number of steps and pitch of the staircase.
2.
Projectional length of the nosing.
3.
The thickness of the staircase tread.
It is recommended you start by understanding these terms before commencing. Once
you do understand these terms, and the measurement and planning of your staircase,
the actual time to produce the stair strings could take less than an hour.
Terminology and standards - Parts of a staircase(GLOSSARY)
String
The string is the wooden side support, which holds the tread. It is either positioned on one
or both sides. All machining with the router takes place on the string.
Tread
The tread is the wooden part on which you stand on a staircase.
Riser
The riser is the part between each tread (See diagram). This effects the rise which is
measured from the top of the tread to the top of the next tread and every step or landing
must have an equal amount of risers. British standards insist that the rise of a step must be
no more than 220mm for a private stairway and not more than 190mm for a common
stairway. Approved Document K states that the number of risers in a flight should be
limited to 16 if a stairway serves an area used for shop or assembly purposes.
Nosing
The nosing is the length of material which overlaps the riser. we reccomend that this should
project by no less than 22mm and is the size of nosing that can be routed by the smallest
guide bush provided with this jig. However BS585 (Wood stairs) states the minimum should
be no less than 16mm
-3-
C
D
Closed Staircase Cutter
D = 16mm or 22mm
C = 25mm
95º