Three Tool-Free Black Key Dip Methods

By Hannah Beckett

Note: The methods shown here are demonstrated on an upright model for best visuals, but all of the methods work on grand piano actions as well.

Black key dip doesn’t have to be a guessing game, and you don’t even need a gauge! Here are three methods for measuring black key dip on upright and grand pianos without the need for additional tools.

It is not always necessary to use all three methods, but each one comes in handy at different times and on different pianos.

First, bring the black key into the ballpark by making sure it isn’t buried in between the white keys:

The black key should be a minimum of 3.5mm over the white keys:

Using this second method, you can further refine your black key dip with the help of its two adjacent key neighbors. With keys at rest position, slide your finger over the ends of the keys just in front of the capstans. Take note of what you feel: Is there a ridge when you pass over the black key? Is there a dip when you pass over the black key? Observe the landscape and height relationships between the three keys; now, put all three keys in check position and feel the same space. If you have accurate dip on the black key, the keys should feel the same in check as they did at rest.

Now let’s move to the third and most accurate method.

Assuming you have set blow distance and white key dip where you want it, you can check for consistency in jack alignment.

Note that all the jacks are in a straight line.

If dip is off, you’ll see a variance in the black key jack, like this one:

Dip is too shallow, the jack is leaning forward when compared to the white key jacks.

This one can be tricky to see on shorter consoles, but with enough good lighting and some practice, you can definitely see this on most uprights.