Hey there, grinding gear heads! Let’s cut to the chase today—something I get asked at least twice a week from folks in the machining world: Can a double row grinding wheel even be used for external cylindrical grinding? As the guy who’s spent the last 8 years selling these things (yeah, I’m the double row grinding wheel supplier you might’ve gotten a quote from last month), I’m here to break this down like we’re geeking out at a job site, not writing a college thesis. No stuffy jargon, no fake AI flow, just real talk from someone who’s fielded way too many "wait, really?" questions about these wheels. Double Row Grinding Wheel
First off, let’s get the basics straight for anyone who’s new here, no shade. External cylindrical grinding (let’s just call it EGC from now on, I’m not typing that whole phrase every time) is that process where you spin a cylindrical workpiece—think a camshaft for a car, a hydraulic pump shaft, even that tiny pin for a medical device—and grind its outer surface to super tight tolerances. Like, we’re talking +/- 0.0001 inch tight, right? Traditional single row grinding wheels have been the go-to here for decades—they’re simple, cheap enough, everyone knows how to dress them. But double row wheels? These are the ones with two separate grinding faces stacked side-by-side on the arbor, right? I show them to customers and half the time they go, “Wait, those aren’t just two wheels glued together?” Nope, not even close. They’re precision-engineered as a single unit, so the spacing between the rows is dead consistent, no slop.
So the big question: Will this even work for EGC? The short answer is yes—BUT only if you’re using the right double row wheel for the right job. Most people’s first hangup is, “Won’t that mess up the surface finish?” Or “Could it throw off the concentricity?” Let’s tackle those, because I’ve seen both problems and solutions in person.
First, let’s talk when it works like a charm. I had a customer last year—small aerospace machine shop—grinding landing gear pinions for private jets. They were using single row wheels before, but they were getting 2x as many rejections because the surface roughness was just barely over spec. One of their guys saw a double row sample I left at their trade show booth, so they tried it. Why? Because with EGC, you want two things: material removal rate (MRR) and a smooth finish, right? A single row wheel has to do all the heavy grinding and the final finishing in one pass. A double row splits that job—one row is the roughing row, taking big, deep cuts to strip away excess stock fast, and the second is the finishing row, running super light, almost spark-only passes to polish the surface. That’s a game-changer for parts that need both speed and perfect finish. That aerospace shop cut their cycle time on those pinions by 38% and dropped rejections to less than 1%—I still get a Christmas card from their owner about it.
But wait, it’s not all sunshine and no rejections. The mistake I see new users make is grabbing any double row wheel and slapping it on their EGC machine. Here’s the hard part: EGC wheels, regardless of row count, need to match the workpiece material. For example, if you’re grinding high-tensile steel like automotive crankshafts, you need a double row wheel with a ceramic alumina abrasive for the roughing row and a finer grain size aluminum oxide for the finishing row. If you swap that for a generic silicon carbide double row wheel, you’re gonna clog the second row fast, burn the workpiece, and that concentricity I mentioned earlier? It’ll be off. Why? Because double row wheels have to be aligned perfectly with the workpiece’s axis. Most EGC machines have a truing system, but with a double row, you can’t skip the final alignment check. One of my first big customers years ago tried a double row wheel without truing it properly and ended up with a batch of hydraulic shaft collars that were 0.002 inch off center—wasted $12k in materials. Lesson learned.
Another thing people don’t talk about enough: heat. Grinding generates heat, and too much heat ruins EGC parts—you get micro-cracks, work hardening, all that bad stuff. A double row wheel’s design actually helps here. The two rows are spaced just far enough apart that coolant can flow between them, get to the grinding zone, and carry away heat way better than a single row wheel. That’s a huge win for parts that are heat-sensitive—like titanium fasteners for medical devices or aluminum hydraulic fittings. I had a medical parts shop switch to double row wheels for titanium hip pin grinding, and they cut their post-grind stress relieving step by 70% because the wheel took care of most of the heat management. No more waiting 24 hours after grinding to machine the next step.
Now, let’s get to the scenarios where a double row wheel might NOT be the best pick for EGC, because I hate overpromising. If you’re doing super-small-batch work—like grinding one custom bolt for a prototype—swapping between single row and double row is a hassle. The truing time is longer, so you might not save any time on a 1-off. Or if your EGC machine is old, like a 1980s model that doesn’t have precise spindle alignment or powerful enough coolant pumps? A double row wheel needs a stiffer spindle to handle the extra contact area. I’ve had a few small shops with legacy machines reach out, and I’ll always be honest with them—stick to single row for now, because retrofitting the spindle alignment for a double row might cost more than the wheels themselves. That’s not me trying to make a sale; that’s me not wasting someone’s money.
Wait, let’s also clear up a common myth I hear all the time: “Double row wheels are only for surface grinding!” No way. Yeah, they’re popular for surface grinding where you need both roughing and finishing, but EGC is actually a really good fit because of how the workpiece spins. In surface grinding, the wheel moves across a flat part, but in EGC, the workpiece is rotating, so each row of the double wheel only contacts the workpiece for a fraction of the revolution. That means each row gets a chance to cool down between passes, which reduces wear on the wheel. I did a test last year with a local university’s machining lab—they ran EGC on a 4140 steel shaft, single vs double row. The double row wheel lasted 2.5x longer than the single row, and the surface roughness was 15% lower. That’s not just a sales pitch; that’s data from a third party.
Let me also touch on dressing, because that’s a big pain point for anyone using specialty wheels. With a double row EGC wheel, you have to dress both rows evenly. If you only dress the roughing row, the finishing row will be too high, and you’ll get a weird line on the workpiece surface. Most modern EGC machines have automated dressing systems that can handle this, but if you’re doing manual dressing, you have to mark the wheel first so you don’t over-dress one side. I made that mistake my first year selling these—sent a customer a double row wheel, and when they dressed it unevenly, they blamed me. I went out to their shop, watched them dress it, fixed their process, and we adjusted the guide I sent them. Now I include a quick, 1-paragraph dressing tip with every double row EGC wheel order—no fine print, just “here’s how to make sure both rows stay even.”
So putting it all together, to answer the original question: Yes, a double row grinding wheel can absolutely be used for external cylindrical grinding—and in a lot of cases, it’s a better choice than a single row. The key is matching the wheel’s abrasive type, grain size, and bond to your workpiece material, making sure your EGC machine has the spindle stiffness and coolant flow to handle it, and taking 2 extra minutes to align and dress the wheel properly.
I get it, switching from what you’ve always used is scary. I’ve worked with guys who’ve run single row wheels for 30 years and hate trying new stuff. But last quarter, I had a job shop with 5 EGC machines try a batch of double row wheels for their engine component work. After 3 months, they called and said they were ditching 2 of their single row machines entirely because the double row wheels were so much faster and more consistent. That’s the kind of win that makes me love this job—helping guys make their jobs easier, not just selling wheels.
If you’re reading this and you’ve been eyeing double row wheels for your EGC work but not sure if it’s worth testing, hit me up. I don’t do pushy sales pitches—if your setup isn’t right for double row, I’ll tell you. But if it is, I can send you a free sample (no strings attached, I swear) so you can test it on a few of your parts. I’ve got a track record of helping shops cut cycle time, reduce rejections, and stop wasting money on wheels that aren’t doing what they need to.
Don’t overcomplicate this. At the end of the day, double row wheels aren’t a gimmick for EGC. They’re a proven tool for shops that want to get better results faster. All it takes is using them right.
Aluminium Cutting Disc REFERENCES
- Astakhov, V. P. (2006). Tribology of Metal Cutting. Elsevier.
- Marinescu, I. D., et al. (2007). Handbook of Ceramic Grinding and Polishing. William Andrew Publishing.
- Shaw, M. C. (1996). Principles of Abrasive Processing. Oxford University Press.
Yongkang Delun Grinding Tools Co., Ltd.
Yongkang Delun Grinding Tools Co., Ltd. is well-known as one of the leading double raw grinding wheel manufacturers and suppliers in China since 1988. If you’re going to wholesale high quality double raw grinding wheel made in China, welcome to get more information from our factory.
Address: No.101th Tongtai Road, Zhiying Industrial Area, Yongkang City, Zhejiang Province, China
E-mail: Sales02@delungrinding.com
WebSite: https://www.delunabrasives.com/
