Stop Flying Blind: Why We Built a Better CNC Spin Window
By Michael Gimbel · Gimbel Automation
If you run a CNC machine, you know the drill. You hit cycle start, the coolant kicks on, and within seconds, your machine window is a solid brown wall. You are officially flying blind.
For decades, machinists have tried everything to see through the coolant spray. We've used air blasts that barely clear a peephole. We've applied automotive ceramic coatings that wash off in a week. We've even tried tablet screen protectors. But when you are running high-pressure coolant at 1,000 PSI, none of these band-aid solutions work.
The only true solution for continuous visual monitoring inside a machine tool is a self-cleaning spinning window. By using centrifugal force, a spin window flings coolant and chips away, providing a perfectly clear, 360-degree view of the machining process.
Until now, however, adding a rotary viewing window to your CNC machine meant dealing with long lead times, mandatory distributor quotes, and price tags north of $3,200.
At Gimbel Automation, we knew there had to be a better way. That's why we built the CoolantClear™—and after a wildly successful beta program, it is now in full production and available to everyone.
The Problem with Traditional CNC Spin Windows
Spinning windows are not a new concept. European manufacturers like Rotoclear and Visiport have dominated the market for years. Their products, such as the Rotoclear S3, are undeniably effective at keeping the inspection window clean and ensuring continuous control of the workflow.
However, for the average American job shop or production floor, these legacy systems present major hurdles:
The Price Tag
A standard Rotoclear S3 setup typically starts around $3,250, and that's before you factor in installation or replacement parts. For many shops, spending over three grand just to see inside their machine is a tough pill to swallow.
The Purchasing Friction
You cannot simply buy these units online. You have to request a quote, wait for a distributor to get back to you, and navigate a lengthy sales process. We believe that buying shop equipment should be as easy as buying anything else online.
The Complexity
Many legacy systems require complex pneumatic sealing air setups or extensive machine modifications to install. Some require drilling a 10-hole reference circle directly into your machine door window just to mount the unit.
The Availability
With long lead times and distributor-only purchasing, getting a spinning window installed on your machine can take weeks or even months. That's time you're still flying blind.
When we looked at the market, we realized that shops didn't need a more complicated system; they needed a reliable, affordable Rotoclear alternative that they could buy today and install tomorrow.
Enter CoolantClear™: The No-Nonsense Rotary Wiper
We designed the CoolantClear™ specifically to solve the CNC window coolant problem without the exorbitant markup.
Beta Complete — Zero Failures
We ran a quiet beta with shops across the country. Zero complaints. Zero failures. Every single unit is still running flawlessly today. Shops using CoolantClear™ aren't opening their doors mid-cycle anymore. That beta is done—CoolantClear™ is in full production and available now.
How It Works
CoolantClear™ mounts directly inside your existing CNC door window using an industrial-grade adhesive and sealed plate. There is no drilling required, making it incredibly retrofit-friendly for virtually any milling machine or CNC lathe.
Once installed, the direct-drive motor spins the disc at a continuous 2,500 RPM during your cycle. As coolant hits the spinning surface, centrifugal force instantly flings it outward. The result? The window stays perfectly clear. You stop opening the door mid-cycle, you stop getting coolant on the floor, and you stop guessing if your tool is wearing out.
CoolantClear™ vs. The Competition
When comparing CoolantClear™ to the industry standard, the differences in accessibility and value become immediately apparent.
| Feature | CoolantClear™ | Rotoclear S3 |
|---|---|---|
| Price | $1,579.00 | $3,250+ (quote required) |
| Purchasing | Direct online (Shopify) | Distributor only |
| Rotation Speed | 2,500 RPM | 2,300 RPM |
| Retrofit Friendly | Yes (Adhesive mount) | Limited (often requires drilling) |
| Air Required | No (Optional purge) | Sealing air required |
| Support | Direct US Support | Via Distributor |
| Target User | Job shops & production | New/OEM machines |
| Beta Track Record | Zero failures across all units | N/A |
| Buy Online? | Yes | Quote only |
Why Optical Process Monitoring Matters
Investing in a CNC spin window is not just about convenience; it is a critical component of optical process monitoring and machine tool crash prevention.
When operators cannot see the workpiece, they rely on sound. But running a machine "by ear" is a dangerous game. A clear view into the machine allows operators to:
Prevent Crashes
Detect irregularities, incorrect zero-points, or wrong tool choices before they cause catastrophic damage to the spindle or workpiece.
Speed Up Setup
Continuous visual monitoring makes initial setups faster and safer without constantly opening the doors.
Optimize Machining
Visually verify chip evacuation and coolant nozzle placement in real-time.
Enable Automation
For shops moving toward lights-out manufacturing or automated machine tending, having a clear window is essential for operators to quickly verify that robotic systems are loading parts correctly without interrupting the cycle.
Integrates with Our Full Automation Ecosystem
CoolantClear™ is just one piece of our mission to make CNC automation accessible to every shop. It integrates seamlessly with our broader product line:
GimGrippers™ — Spindle-mounted grippers for automated part loading and unloading without a robot.
AutoVises™ — Pneumatic self-centering vises that open and close via M-code for fully automated workholding.
IntraLoad™ — In-machine pallet changers that let you swap fixtures without opening the door.
Semi-Turnkeys — Complete CNC tending solutions shipped to your door at 8–14% the cost of traditional automation.
Stop Guessing. Start Seeing.
The days of the $3,000+ spinning window are over. CoolantClear™ delivers the exact same centrifugal clearing technology, a faster rotation speed (2,500 RPM), and a simpler installation process—all at a fraction of the legacy price.
There are no quotes, no distributors, and no waiting. You buy it, and it ships immediately.
We designed it for the same reason we design everything at Gimbel Automation—because CNC shops deserve tools that actually work, that don't require a six-figure budget, and that you can buy without picking up the phone.
If you are tired of looking at a brown wall of coolant and want to bring true visibility back to your shop floor, it is time to upgrade your CNC machine window.
If you've got questions about fit, compatibility, or installation, hit us up at sales@gimbelautomation.com or call 855-444-3918. We actually answer.
More about our CNC automation products at gimbelautomation.com. Follow the build on Instagram @gimbelautomation.
