The action - what it is and how it works
The terms 'action' and 'keywork' are, to some degree,
interchangeable. However, there are subtle differences between the two
- as will be explained.
The keywork refers to the physical stuff....ie the keys themselves, and
their component parts - the action refers to the way in which those components
act. For a more detailed description of the keywork, have a look at the
page. There are three main physical components that go to make up the
action: The keys themselves; the pivots upon which they move; and the
springs, which power the keys. Lesser physical items include the cork
or felt buffers which cushion the keys.
Here's a typical group of keys...
You may have heard the term 'action' used in several ways, and its meaning
changes slightly depending on whether it's being used to decribe the way
in which the keys are set up and how they move, or whether it's being
used to describe the physical properties. Thus while players might refer
to 'a fast action' or a 'low action' - repairers might talk about 'a loose
or sloppy action'. The really unlucky players get to use the phrase 'a
So lets deal with these terms one by one - starting with 'a fast action'.
The 'feel' of an instrument relies a great deal on its action. Many components
have to work together in harmony to produce a good action - the pivots
must be well lubricated and tight enough to provide a smooth movement,
yet not so tight as to bind.
The springs must be set at the right tension to counterbalance the weight
of the keys and have sufficient power to raise the keys smartly when they
are released - but they should not be so strong as to excessively resist
the force applied against them.
Finally the keys must be set to the optimum height, which is judged by
the distance between the top of the tone hole and the surface of the pad.
But surely the less a key has to move, the better the action? Why not
set the keys as low as possible?
Because there is a tradeoff. There is a 'golden point' at which the height
of the action gives the best feel and speed with the best tone. Lower
the keys too far and you muffle the sound - and you may even flatten the
pitch of certain notes. Raise the keys too high and the instrument responds
unevenly - and again there is the risk of tuning problems.
Some horns are built in such a way as to tolerate a lower action than
normal - and this, combined with a carefully balanced set of keys allows
the repairer to capitalise on these inherent strengths to produce an action
that is highly responsive without apparent loss of tone. A classic example
of an instrument capable of sustaining a fast and low action is the Conn
Underslung alto saxophone. It's possible to have a fast action when the
keys are set higher, but it requires a great deal of skill to set up and
a well made instrument (or you could just get lucky).
As you will probably realise, the above explanation pretty much covers
the 'low action' term too.
However, the two do not necessarily go hand-in-hand. Because of the setup
that some players use (and by setup I mean the reed/mouthpiece combination,
and sometimes other factors such as the pad reflectors/resonators) they
can afford to lose some of the instrument's 'built-in' tone, relying on
their technique and setup to replace it - though you really do need the
right sort of instrument, the right mouthpiece and a good technique.
So what of the loose or floppy action?
The physical movement of the keys on their pivots creates friction, and
friction=wear. The pivots are generally made of steel, the keywork of
a softer metal such as brass or nickel silver - so it's the keys that
wear first. Of course, you cannot stop this process - but you can delay
it by oiling
Other factors that lead to a sloppy action include damage to the body
(thus throwing the pillars out of line), pivots working loose (ironically
enough a common problem with new instruments, where the action is tight...but
not stiff) and plain old duff manufacturing. Such an action can have a
far worse effect that merely making the instrument feel uncomfortable...it
can cause leaks, which lead to poor note production and intonation. It's
also one of the more labour-intensive problems to fix, and therefore quite
A stiff action is a terrible thing to have. As mentioned, it's not the
same as a tight action. A tight action is a new action, nice and slick...quiet
and positive - and a little wear will serve only to enhance the feel as
the instrument is 'played in'.
By stiff I mean slow and awkward, with binding or even stuck keys. Nine
times out of ten this will be down to rusted steel pivots - with perhaps
the odd bent key thrown in for fun.
As for the lesser factors that contribute towards the action as a whole
there is a great deal of tweaking that can be done with regard to springs
and key corks. There are four factors that affect spring action: The diameter
of the spring; its length; the material its made of and the degree of
offset bent into it.
The key corks/felts are an important part of the feel of the action as
it's they that cushion (or buffer) the action against the body and determine
the height of the keys. Badly set key corks can lead to a clunky feel..this
is known as double action. This occurs when a key cork wears or is compressed.
On most instruments pressing one key down actuates another - hopefully
at the same time - and where one key connects to another (known as a linked
key) it'll need to be buffered, otherwise the two keys will clank against
each other. Such buffers are known as 'regulation corks', though they
may well be made of felt or Teflon sheet/tubes - and as a general rule
their thickness is critical to the proper functioning of the action.
If you press a linked key down and feel a slight clunk, take a closer
look at what's happening. You'll most likely find that the key you pressed
down moves a millimetre or so before it moves the key it's connected to.
Try the F key - on saxes and flutes this links to the Aux.F key above
Clarinettists should try the middle F, this links across the middle tenon
joint. Or try the low E key, which links to the low F key.
You can remove this double action by replacing the cork...but which one?
Get it wrong and your new cork will prevent the pressed key from closing,
or simply move the double action further up or down the instrument. The
practice of removing this double action and ensuring all the keys close
as they should is known as 'regulating the action'. If your instrument
exhibits double action then it is said to be 'out of regulation'.