Climb cutting is when you move the router in a
counterclockwise direction. When using this method with a template, for
notching grooves out a stair stringer, the router could become
dangerous.
I've probably routered out thousands of individual
stair treads with a 3 1/2 horsepower router and trust me, when you hit a
knot or your climb cutting, you'd better be holding on to that router
with both hands.
Most people use their router in a clockwise direction, but every once in
a while, you will need to reverse the direction, in order to clean out
some of the wood chips or debris. Just be careful, when doing this.
Stair Routering Tip: If you need to router out a depth of 3/4 of an
inch, in your stair stringer, you can always do it in two steps. Set
your router for 3/8 of an inch depth and then router the tread groove
out to a 3/8 of an inch depth. Then you can reset the depth of the
router to 3/4 of an inch and finish routering.
It might take a little longer, but this method might save your body a
little wear and tear and it could extend the life of your power tool.
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