Weighted hammer action is a type of keyboard action that simulates the feel of an acoustic piano. The keys are weighted so that they require more pressure to press down than unweighted keys. This gives the pianist a more realistic playing experience and allows for greater control over dynamics. Weighted hammer action keyboards are typically found on higher-end digital pianos.
Graded Hammer Action
Graded hammer action is a type of weighted hammer action that takes into account the fact that the hammers in an acoustic piano are weighted differently depending on their position on the keyboard. The keys in the lower register are heavier than the keys in the upper register. This simulates the feel of an acoustic piano more accurately and allows for even greater control over dynamics. Graded hammer action keyboards are typically found on the most expensive digital pianos.
Comparison
The main difference between weighted hammer action and graded hammer action is that graded hammer action keyboards simulate the feel of an acoustic piano more accurately. This is due to the fact that the keys are weighted differently depending on their position on the keyboard. Graded hammer action keyboards also allow for greater control over dynamics.
Ultimately, the best type of keyboard action for you depends on your individual playing style and budget. If you're looking for the most realistic playing experience possible, then a digital piano with graded hammer action is the best option. However, if you're on a budget or you don't need the extra features of graded hammer action, then a digital piano with weighted hammer action is a good choice.