Norton Abrasives Grinding Wheel T1 vs CBN: A Buyer's Honest Comparison

I'm the office administrator for a 40-person metal fabrication shop. I manage all the consumable ordering—abrasives, tooling, shop supplies—and I report to both operations and finance. That puts me in an odd position: I care about the invoice, but I also have to care about whether the grinding wheel actually cuts the way our machinists expect.

When I first started buying abrasives, I assumed a Norton Abrasives grinding wheel T1 was more or less the same as any other wheel. I focused on arbor size and price. Three scraped parts and one full afternoon of rework later, I learned that the marking system exists for a reason. Now I read the wheel marking before I order anything.

This is not a sponsored review. It's a practical comparison from someone who signs the POs.

What we are comparing: Type 1 and CBN are not the same kind of category

Here's the first confusion I had. Type 1 is a shape. CBN is an abrasive. The search phrase Norton Abrasives grinding wheel T1 usually means a straight wheel, flat on both sides, with a center hole. The grinding wheel itself can be made of aluminum oxide, silicon carbide, ceramic, or CBN. So when people ask what is CBN grinding wheel, they are asking about the abrasive layer, not the shape.

If you remember one thing: the type number tells you the shape. The abrasive type tells you what the cutting edge is made of.

The real difference starts with the wheel itself

A conventional Type 1 wheel uses abrasive grains like aluminum oxide held in a vitrified bond. The Norton Abrasives 38A220-HVBE is a good example. It's a conventional Type 1 wheel in the 38A white aluminum oxide line. The 38A is the abrasive type, 220 is the grit size, H is the hardness grade, and VBE is the vitrified bond. That combination makes it a finishing wheel for precision toolroom and surface grinding jobs.

A CBN grinding wheel uses cubic boron nitride grains instead. CBN is nearly as hard as diamond and works particularly well on hardened ferrous materials. In a Type 1 configuration, it looks similar from the outside. The difference is inside: the cutting layer is superabrasive, and the bond is typically metal, resin, or vitrified.

In plain language: conventional wheels are flexible and forgiving; CBN wheels are specialized and extremely consistent. If you are grinding hardened steel all day, CBN has the performance advantage. For a general fabrication shop, conventional abrasive is still the daily workhorse.

Material compatibility is not what I expected

This is where I made my initial mistake. I thought the expensive superabrasive wheel would work on everything. It doesn't.

CBN is for ferrous materials: hardened tool steel, high-speed steel, cast iron, and similar alloys. It is not the right choice for soft aluminum or most non-ferrous metals. For those, you are usually better off with conventional aluminum oxide or silicon carbide.

The Norton Abrasives 38A220-HVBE, on the other hand, is a precision conventional wheel. It works well on hardened carbon steel, tool steel, and high-speed steel in surface grinding and cylindrical grinding setups. But it's not a cutting-off wheel. It's not made for an angle grinder. That's the other part of reading the marking: knowing what the wheel is designed to do, not just what material it can cut.

Sticker price vs cost per part

Let's be honest: CBN wheels cost more upfront. A lot more. I won't quote specific prices because they vary by size, bond, and supplier. Don't hold me to this, but in our shop the conventional wheel was the obvious winner on the invoice and the CBN wheel was the obvious winner on the overall cost.

When we put a CBN wheel on a surface grinder doing hardened tool steel for full shifts, the wheel life went up, dressing intervals went down, and parts stayed in tolerance longer. The surprise wasn't the performance. The surprise was the math. Cost per finished part said CBN.

But I do not want to oversell it. If your shop grinds different materials every day and only runs precision work occasionally, a CBN wheel might sit idle. The payback only appears when the wheel is actually cutting. For low volume, the conventional Type 1 is the safer purchase.

How to read the grinding wheels chart

Part of the reason I bought the wrong wheels was that I didn't understand the markings. A grinding wheels chart is not just for engineers. It's the buyer's cheat sheet.

According to ANSI B7.1, the marking system covers the abrasive type, grit size, grade, structure, and bond. The type number is the wheel shape. So if a wheel is labeled 38A220-HVBE and is Type 1, you know the shape and the construction.

Here is the quick version I keep in my head:

• Abrasive: A for aluminum oxide, C for silicon carbide, CBN for cubic boron nitride
• Grit: lower numbers are coarse, higher numbers are fine
• Grade: a letter from A to Z; H is on the softer side
• Bond: V for vitrified, B for resin, M for metal

The exact sequence can vary by manufacturer, but the logic is the same. Once you can read that, you can look at almost any wheel and guess whether it belongs on a heavy grinding job or a finishing pass.

I keep a laminated grinding wheels chart inside the lid of our tool box with big wheels. That sounds like a small thing, but it changed how I order. When one of our guys calls me from the shop floor and says the wheel in the grinder seems hard, I ask them to read the markings. Usually that tells me whether we need a softer grade, a different grit, or a different abrasive entirely.

What I would order today

If you are in a metal fabrication shop or a toolroom that needs a dependable, general-purpose precision wheel, a conventional Norton Abrasives grinding wheel Type 1 is the reasonable choice. A wheel like the Norton Abrasives 38A220-HVBE covers a specific job: precision finishing. If that's your job, order it. If you are just cutting off material, buy a cutting wheel, not a finishing wheel.

If you grind hardened tool steel or high-speed steel for hours every day, look seriously at CBN. But do the cost-per-part math first. Do not assume it will fix a misbehaving grinder or a bad setup. CBN is not a magic patch; it's a tool that works within the right operating conditions.

If you are a hobbyist or you only use a grinder once or twice a month, skip CBN. Honestly. The upfront cost is hard to justify, and a conventional wheel will do what you need.

If you ask me, there is no best wheel. There is only the wheel that fits the material, the machine, the volume, and the invoice. The more precise you get about those four things, the fewer bad orders you will place.

I still make mistakes. But I've made a lot fewer since I started with the chart. Ten minutes checking specs before I order has saved me more money than any discount code I've seen. That's it. The chart is in the tool box with big wheels, and the tool box is never far from the machines.