How Zerno Was Born: A Conversation With Our Founder

 

Our friend Dustin from Roasted Road recently visited Zerno HQ and sat down with our founder, Vel Genov, for an honest conversation about how this company started, what drives the decisions we make, and where we're headed next. The full interview is below, followed by some highlights from the story behind it.

 

It Started With a Problem

Before Zerno existed, Vel was just a coffee enthusiast with a frustration he couldn't shake. He'd invested in a quality espresso machine and was trying to dial in his shots at home—adjusting the grind, pulling shot after shot, chasing consistency. But something wasn't adding up. He'd turn the adjustment dial one way and get a result he didn't expect. Was it him? Was it the equipment? He couldn't tell. And for someone who cares about precision, that ambiguity was the problem.

The grinder he was using at the time was a good product from a company he still respects. But the experience planted a seed: if he ever built a coffee grinder, the input would match the output. You turn the dial, and you get exactly what you asked for. No guessing.

That idea became Zerno.

From a Basement to a Building

Zerno started in Vel's basement. From there, it moved through the mHUB Chicago hardware incubator, then onto one workshop...then a second...then a third. Today, Zerno owns its facility, a space purpose-built for the kind of work this company does.

That progression wasn't just about needing more room. It was about needing more control. Early on, Vel recognized that the precision he was after—tolerances measured in microns, alignment so tight there's essentially nowhere for anything to move—required making the critical parts in-house.

The facility runs Japanese-made Okuma CNC lathes to ensure that Zerno grinders can hold tolerances down to single-digit microns. The bearings are oversized, high-quality units imported from Europe and arranged in a specific configuration designed for rigidity and longevity. Even the motor driver in the Z2—the electronics that control the brushless servo motor—is a custom design, built from scratch by the Zerno team because the off-the-shelf alternatives couldn't deliver the grinding torque and consistency they needed across the full 200 to 2,000 RPM range.

Why the Grinder Matters More Than You Think

A grinder may be the single most impactful piece of equipment in your coffee setup.

Here's why: When burrs are misaligned, even slightly, coffee on one side of the burr set gets ground to a different particle size than coffee on the other side. That variance is invisible to you as the user, but it shows up in the cup—muddled flavors, inconsistent extractions, a dialing-in process that feels random instead of logical. A well-aligned grinder eliminates that variable, which is why Zerno's assembly is designed to be extraordinarily rigid: oversized preloaded bearings, tight-tolerance components, and an adjustment system graduated in microns that actually moves the way you'd expect it to.

The Z2 also introduced variable RPM control, a feature customers had been requesting. But rather than bolt on a standard brushless motor driver, the team developed a custom servo brushless system—a closed-loop design with an encoder—that delivers real torque and precision across the full speed range. The result is a grinder that performs at 200 RPM with the same authority it does at 2,000.

As for what different RPMs actually do to particle size distribution and taste? Well, the science isn't fully settled yet. Zerno relies on taste-based evaluation alongside emerging research, and Vel is open about wanting to invest more in that area—including eventually bringing a particle analyzer in-house.

What Comes Next for Zerno

When asked what keeps him up at night, Vel's answer isn't about competitors or market share. It's about a tiny adjustment to the feel of the dial in a specific range. It's about tracing back from a desired improvement to the manufacturing process change that would make it possible—maybe a material change, maybe a new machine, maybe a new hire.

That's where Zerno is now. The major boxes are checked. The Z1 and Z2 have earned recognition in the form of the Specialty Coffee Association's Best New Product award, the Chicago Innovation Award, and a growing reputation that Vel hears reflected back more and more: "I hear you guys make the best coffee grinder out there."

The work ahead is refinement at the margins. And there's a conviction underneath all of it that Vel comes back to near the end of the conversation: What Zerno makes tomorrow will always be better than what we make today.

Zerno is growing, but the commitment is to keep the feel of a company where every grinder is made with the same care as the first ones that shipped out of Vel's workshop. If you're ever in Chicago, consider this your official invitation: Reach out and come by HQ to see how these things are actually made.

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Watch the full conversation above, or visit Roasted Road's YouTube channel.