Rotary Knobs on Mechanical Keyboards: What They Do and How to Use Them

Quick Answer

A rotary knob on a mechanical keyboard is a physical dial that you can turn and press to control functions like volume, scrolling, zoom, or media playback. To use one, install the knob on your keyboard's encoder, then customize its actions in your keyboard's software. For GMMK PRO owners, the GMMK PRO Rotary Knobs offer a solid, quality feel and are a simple drop-in upgrade.

If you've seen a mechanical keyboard with a small dial near the top-right corner, you've seen a rotary knob. It's not just for looks—it's a functional input that can speed up everyday tasks. Instead of reaching for your mouse to adjust volume or scroll through a page, you can turn a knob that sits right at your fingertips.

In this guide, you'll learn what a rotary knob does, how to customize it, and how to install one on a compatible keyboard like the GMMK PRO. We'll also cover common mistakes to avoid so you get the most out of this handy feature.

What Does a Rotary Knob Do?

A rotary knob, also known as a rotary encoder, is a dial that can rotate continuously and also act as a button when pressed. On mechanical keyboards, it's typically used to control volume, but its functions are not limited to that. Depending on your keyboard's software, you can assign the knob to scroll pages, zoom in and out, switch between virtual desktops, or even cycle through RGB lighting modes.

The knob's rotation direction (clockwise or counterclockwise) can be mapped to different actions, and the press can trigger a separate command. This makes it a versatile tool for both productivity and gaming. For example, you could set it to adjust volume in normal use and to switch weapons or zoom in games.

• Rotary knobs are not just for volume—they can be customized to perform many actions.

How to Install a Rotary Knob on Your Keyboard

Installing a rotary knob is usually a straightforward process. Most keyboards that support a knob have a metal or plastic stem sticking out from the encoder. To attach the knob, simply align the knob's internal hole with the stem and press down firmly. Some knobs use a set screw to secure them, but many are friction-fit.

Before you install, check that the knob is compatible with your keyboard model. For example, the GMMK PRO Rotary Knobs are designed specifically for the GMMK PRO. They are praised for their excellent quality and solid feel, though some users note the color may appear darker than expected. Always verify the stem size and shape to ensure a proper fit.

• Make sure the knob fits the encoder stem—forcing it can damage the switch.

Customizing Your Rotary Knob

Once the knob is installed, you'll need to configure it. Most keyboards with rotary knobs use proprietary software. For GMMK PRO, you can use Glorious Core to remap the knob's rotation and press actions. In the software, you'll see options for 'Knob' or 'Encoder' settings. Assign clockwise, counterclockwise, and press actions to the functions you want.

If your keyboard doesn't have official software, you might be able to use third-party tools like AutoHotkey or QMK, depending on your keyboard's firmware. However, not all keyboards support custom mapping, so check your keyboard's documentation first.

• Test each action after mapping to ensure the knob responds as expected.

Step-by-Step: Using a Rotary Knob on Your Mechanical Keyboard

1. Check compatibility: Confirm your keyboard has a rotary encoder and that the knob you have fits the stem. For GMMK PRO, the GMMK PRO Rotary Knobs are a direct fit. Common mistake: buying a knob without checking stem size, which can lead to a loose fit or damage.
2. Install the knob: Align the knob with the encoder stem and press down firmly until it sits flush. If there's a set screw, tighten it gently. Checkpoint: The knob should turn smoothly and not wobble.
3. Open your keyboard software: Launch the software for your keyboard (e.g., Glorious Core for GMMK PRO) and locate the knob or encoder settings. Common mistake: skipping software setup and assuming the knob works immediately—it may not have default actions.
4. Assign actions: Set clockwise, counterclockwise, and press actions. For volume, assign clockwise to volume up, counterclockwise to volume down, and press to mute. Checkpoint: Test each action to ensure it triggers correctly.
5. Test and adjust: Use the knob in real tasks—adjust volume, scroll pages, or switch apps. If an action feels wrong, go back and remap. Final step: Once it feels natural, you're done. Enjoy the convenience.

Products That Help

• GMMK PRO Rotary Knobs: GMMK PRO Rotary Knobs are praised for their excellent quality and solid feel, though some customers find the color darker than expected. The appearance and look of the knobs are also highly appreciated. If you own a GMMK PRO, these knobs are a reliable, well-made option that feels solid in use. Just be aware that the color may be slightly darker than what you see online.
• Glorious GPBT Backlit Keycaps – PBT Keycaps for RGB Keyboards: Premium PBT polymer resists wear, keeping its texture through countless gaming sessions. Injection-molded doubleshot legends let RGB light shine through while staying crisp, consistent, and fully-fade resistant. Pairing a rotary knob with durable backlit keycaps keeps your keyboard looking consistent and ensures the legends stay crisp even with heavy use.

A rotary knob on your mechanical keyboard is a small addition that can make a big difference in how you interact with your computer. Whether you use it for volume, scrolling, or custom shortcuts, it's a practical upgrade that saves time and adds a touch of personality to your setup. If you own a GMMK PRO, the GMMK PRO Rotary Knobs are a solid choice—just remember to check the color before you buy.