I'm not a metrology engineer. I'm the office administrator who buys metrology equipment for a company of about 300 people across two locations. I manage roughly $400,000 in annual vendor spend, and I report to both operations and finance. So when someone asks me about FARO CMM arm measuring machines versus the FARO Laser Tracker Vantage, I can't quote beam divergence from memory. But I can tell you what it costs to own, train for, calibrate, and actually use both. Sometimes that's the part that matters.
This article is a comparison, but it's not a "which is better" piece. The question is: which one fits the job you're doing on a regular basis? To answer that, I use four dimensions: measurement volume, setup and portability, operator skill, and long-term cost. Let's walk through them.
The Comparison Framework I Use
It took me about three years and roughly 40 purchase orders to understand that measurement equipment isn't better in the abstract. It's better in a specific context. When I saw our engineers requesting quotes for a small part inspection and a full vehicle scan side by side, I finally realized why we had to consider two very different FARO products.
The difference, in one sentence: a portable arm brings the probe to the part within a few meters; the laser tracker follows a reflector over a much larger volume. Both are portable 3D measurement systems. They're just built for different scales.
Measurement Volume: Local vs. Large-Scale
FARO CMM arm measuring machines are what the name says: articulated arms with a measuring probe, usually sized for parts that fit within roughly two to four meters. You touch the probe to a surface, and the arm records coordinates. It's accurate and stable within its working envelope. If your part fits on a table or a small tooling fixture, an arm is often the better choice.
The FARO Laser Tracker Vantage is a completely different system. It's a stationary laser tracker that locks onto a reflector or a 6DoF probe and measures positions over long ranges—tens of meters, depending on the model and setup. It's the tool for measuring a vehicle body, an aircraft assembly, or a large weldment that won't fit near anything.
The surprise wasn't that the tracker can measure farther. The surprise was that the arm was actually more accurate than the tracker for close-range work. The tracker's spec sheet often gives error in terms of micrometers plus micrometers per meter; the arm's error stays roughly constant within its volume. That's not a flaw in the tracker. It's physics.
Verdict: Under about three meters, choose the arm. Over that, choose the tracker. The unit of measurement is the part, not the brand.
Setup and Portability: It's Not Just Weight
Both are portable in a way that a traditional stationary CMM is not. But there's a difference in how much friction the portability creates.
The arm is what I'd call "bench portable." It travels in a case, goes on a tripod or a small stand, and if you've done it once, you can set it up in 15 or 20 minutes. Our technicians move it between work cells without a second thought. Shipping it for calibration is straightforward—it fits in an SUV.
The Laser Tracker Vantage is "project portable." It's heavier, needs a stable setup, warm-up time, and line of sight to the reflector. You're not moving it around a machine shop on a cart between every part. You choose a spot, calibrate the reference, and then measure everything you can from that position. It's still way more flexible than a fixed CMM, but it's not an on-demand handheld.
The question isn't whether a tracker can be moved. It's whether the setup time is worth it for your workflow. If you're measuring large parts in a dedicated area, the setup is a non-issue. If you're bouncing between small jobs all day, the arm wins.
Operator Skill and Learning Curve
When we bought our first arm, our senior technician was taking basic measurements after an afternoon of training. The software took longer, but the physical operation was intuitive: touch the part, read the point.
The tracker was a different story. I'm not 100% sure of the final training hours—I wasn't in the room—but I remember scheduling at least three days of vendor-led training, and we still had to call support a few times in the first month. The concepts of SMRs, probe calibration, and maintaining line of sight aren't hard once you've seen them, but they're not obvious either.
That training cost matters. Every hour a technician spends learning a system is an hour they're not inspecting parts. If your team is used to handheld tools like digital calipers, a portable arm will feel like a natural step up. A laser tracker is more of a leap.
Cost, Calibration, and Support
I'll be direct with numbers, but verify current pricing with FARO or an authorized distributor. In our 2024 quotes, a mid-range portable CMM arm with accessories landed somewhere in the $50,000–$90,000 range. The Laser Tracker Vantage with the 6DoF package started well above $100,000. Both are significant investments.
Calibration is where people sometimes get caught. Both instruments need regular recalibration—usually annually—and you should budget for it. I plan roughly 5% of the instrument value per year for calibration, service, and consumables. That's been close enough to reality for us.
When I evaluate vendor proposals, I look for substantiated performance claims. Per FTC advertising guidelines (ftc.gov), claims have to be truthful and backed by evidence—so I request the official spec sheet with maximum permissible error (MPE) values before we commit. FARO publishes those. Any vendor that won't share MPE data doesn't get on our approved list.
When It's Not a FARO Problem
Here's something I've learned the hard way: not every precision measurement job needs a portable 3D system. We use digital calipers for quick dimensional checks on smaller parts. We buy them from tool suppliers, not from FARO. For lab liquid handling, an automated pipette is a precision instrument, but it's not a metrology solution, and I wouldn't expect FARO to sell it. If the question is how to use Starrett angle finder, I'll point someone to the manual or a good machinist forum—I don't pretend to be the expert there.
I mention this because FARO has been clear with us about boundaries. One of their sales engineers once said:
"That's not our strength. Here's who does it better."
That response earned my trust for everything else. A specialist who knows its limits is more useful than a generalist who says yes to everything.
Which One Should You Order?
If I were setting up a measurement capability from scratch, here's what I'd recommend:
- Choose the FARO CMM arm if your parts are small to medium, measurement tasks change during the day, setup speed matters, and the team needs to be productive quickly.
- Choose the FARO Laser Tracker Vantage if you're measuring large assemblies, need high accuracy over long distances, and have the time to invest in training and setup.
And if you're not measuring 3D geometry at all, don't buy either. Buy the right small tool: a caliper, an indicator, or whatever matches the job. That's not a downgrade; that's good procurement.
Looking back, I should have scheduled a demo of the tracker before we signed the PO. At the time, the spec sheet looked convincing, and our engineers were eager. Given what I knew then, it wasn't an unreasonable choice—but a day on a shop floor would have saved us a few surprises with accessory selection. The best part of finally getting our process systematized: no more late-night calls about whether the tracker could see the reflector. It's the kind of clarity that comes from comparing the actual work, not just the marketing materials.
Leave a Reply