If you’ve ever sat in a workshop staring at a small hobby CNC router, wondering why some bits struggle to cut through ½-inch MDF while others zip through 1-inch solid oak, you’ve asked the same question I get a hundred times a month as a hobby CNC router supplier: what’s the real maximum depth of cut for these machines? I don’t just give a generic number when a customer asks—because the truth is, there’s no one-size-fits-all answer. It’s a mix of what your router can handle, what you’re cutting, and how you set it up, and today I’m breaking it down like I do for every person who walks through my workshop or sends me a message at 9 p.m. (I get it, CNC projects hit at weird hours). Hobby CNC Router
First, let’s get the basics out of the way: maximum depth of cut is the total amount of material a router bit removes in a single pass, right? But for hobby machines, that number isn’t etched in stone on a spec sheet. Most entry-level hobby CNC routers—think the ones I sell to makers, small woodworkers, and hobbyists who don’t want to drop $10k+ on industrial gear—have a standard spec that tops out around 1 to 2 inches of depth for most common materials. But wait, that’s only if everything else lines up wrong. I’ve had a customer with a 1.5-inch depth limit router cut through 2 inches of soft pine in three passes, and another with the same model struggle to get through ¾-inch MDF because they picked the wrong bit and ran it too fast.
Let’s talk about the key factors that actually change that number, because this is where most people get tripped up. The first, and biggest, is the machine itself. Not just its advertised max depth, but its spindle power and torque. Most hobby CNC routers have a spindle that’s between 1.5HP and 3HP. A 1.5HP spindle is great for small projects, but it’s not going to push through thick hard material. A 3HP spindle, on the other hand, has enough torque to handle deeper cuts, but only if the rest of the setup is correct. Then there’s the gantry and frame rigidity. If your router’s frame wiggles when you press a little extra pressure on the bit, you’re not going to get a deep cut—you’ll get a wobbly edge, or worse, a bit that snaps. I’ve seen customers try to run a 2-inch deep cut on a cheap, flimsy hobby router and snap three bits in an hour because the machine couldn’t hold the path straight. That’s why when I help someone pick a router, I don’t just ask what their max depth is—it’s what their project max depth is, and what material they’re cutting.
Next up, the material you’re working with. This is non-negotiable. Soft materials like pine, balsa, foam, and soft plastics can handle way deeper cuts than hard materials like oak, maple, or even high-density MDF. For example, a 1.5-inch depth of cut is totally reasonable for soft pine in a single pass, but that same number is crazy for solid oak—you’d be lucky to get ½-inch deep in a single pass with a hobby machine on oak. Then there’s things like composite materials, acrylic, or even aluminum. Aluminum is a whole different beast; even a 3HP hobby router can only handle about ¼-inch depth of cut in aluminum in single passes, because it’s so dense and hard on bits. I had a customer last month who tried to cut a 1-inch deep aluminum sign on his entry-level hobby router, and he destroyed two ¼-inch end mills before he realized he needed to break that cut into smaller passes.
Then there’s the router bit choice and setup. This is where I see the most mistakes, and it can double or halve your effective depth of cut. A straight cut bit (also called a router bit or end mill) with a high number of flutes? Those are for fine cuts, not deep ones. A compression bit or a roughing bit with wider flutes and a steeper helix angle is built to remove more material faster, so you can get deeper cuts without straining the spindle or snapping the bit. Also, bit size matters—larger diameter bits (like ¼-inch or ½-inch) are more stable and can handle deeper cuts than tiny ⅛-inch bits. I always tell customers: if you want a deeper cut, use the largest bit you can that fits your project, not the smallest one. Then there’s speed and feed rate. If you run your spindle too fast and your router too slow, you’re going to overload the bit and the spindle, leading to a shallow cut or broken bit. I recommend that for hobby routers, you run at 10,000 to 18,000 RPM, and adjust your feed rate based on material. For soft pine, that’s about 100 to 150 inches per minute, for oak it’s 50 to 70 IPM. Mess that up, and your max depth of cut will be half of what it could be.
Wait, let’s also talk about something a lot of hobbyists forget: chip load. Chip load is the amount of material each flute of your bit removes per revolution. It’s the difference between a clean, deep cut and a ruined bit. For a 1/4-inch end mill, a good chip load for hobby use is about 0.001 to 0.003 inches per flute. If you go over that, you’re forcing too much material, and the bit can’t clear the chips, leading to overheating, which dulls the bit fast and limits how deep you can cut. I always teach new customers to calculate chip load when setting up their projects, even if it’s just a rough estimate. That small step can make a huge difference in how deep you can go without issues.
Now, let’s get to the practical numbers, because everyone wants to know what they can actually do with a hobby CNC router. I’m not here to brag about industrial specs—this is for hobby machines, the ones my customers actually use. For most entry-level 1.5HP hobby CNC routers, here’s a rough breakdown of max depth of cut per pass (remember, that’s not total material thickness you can cut, that’s how much you remove in one go; if a material is thicker than that max depth, you just do multiple passes):
- Soft materials (pine, foam, balsa, soft plastic): 1.0 to 1.5 inches per pass
- Medium materials (MDF, plywood, walnut): 0.5 to 0.75 inches per pass
- Hard materials (oak, maple, hard plastic): 0.25 to 0.5 inches per pass
- Metal (aluminum): 0.125 to 0.25 inches per pass
For mid-range hobby routers with 2.5HP to 3HP spindles, that number jumps to:
- Soft materials: 1.5 to 2.0 inches per pass
- Medium materials: 0.75 to 1.0 inches per pass
- Hard materials: 0.5 to 0.75 inches per pass
- Metal: 0.25 to 0.5 inches per pass
And for the higher-end hobby machines I sell to small business owners who use their routers for production work, you can get up to 2.5 inches of depth in soft materials, 1 inch in medium, and 0.75 inches in hard—though even those can’t push through 2 inches of solid oak in one pass.
But here’s a hard truth I have to tell every customer: the advertised maximum depth of cut on a router spec sheet is almost never achievable in real-world use. It’s a perfect, ideal scenario: no friction, perfect rigidity, a brand-new top-of-the-line bit, and the exact right speed and feed. In real life, you have to account for the wood’s grain (cutting with the grain is easier, cutting against it is harder), minor frame flex, dull bits, and even the sharpness of your router’s linear rails. That’s why I always tell people to plan for 70% of the advertised max depth as their real-world safe limit. If your router says 2 inches, plan for 1.4 inches max per pass, and adjust from there.
Another common question I get: can you cut material thicker than your router’s max advertised depth? Absolutely, that’s what multiple passes are for. Most projects don’t need a single deep cut anyway. For example, if you’re cutting a 3-inch thick oak table leg, you don’t have to do it all in one pass—you do three passes, each 1 inch deep, and end up with a perfect cut. A lot of new hobbyists stress out about trying to get everything in one pass, but that’s not how CNC routing works, especially for hobby machines. Multiple passes are actually better for your bits and your machine, because they reduce stress on both.
Wait, let’s talk about common mistakes that limit your max depth of cut, because I’ve seen every single one. First, using a too-small frame or a lightweight gantry. A lot of cheap hobby routers are made with aluminum extrusion that’s too thin, so when you push the bit through deep material, the frame flexes, leading to a shallow cut that’s not even straight. That’s why when I design the routers I sell, I use thicker steel gantries and reinforced frames—rigidity is just as important as spindle power when it comes to depth. Second, using the wrong bit. A lot of hobbyists buy the cheapest bits they can find on Amazon, and those dull after a few uses, so they can’t cut as deep. I always recommend solid carbide bits over high-speed steel (HSS) bits if you want deeper cuts—they stay sharp longer, handle higher speeds, and don’t flex as much. Third, ignoring climb cutting. Climb cutting is when your router moves in the same direction as the bit’s rotation, and it removes material more cleanly, reduces chip load, and lets you get deeper cuts. I see so many new hobbyists use conventional cutting (cutting against the bit rotation) which causes more friction, more heat, and limits depth. It takes a little getting used to, but once you try it, you’ll notice a huge difference in how deep you can cut without issues.
And what about things that don’t actually affect max depth of cut? For example, the length of your bit. A lot of people think a longer bit gives more depth, but actually, a longer bit is more flexible, so you can’t cut as deep with it—because it will flex and wander. If you need a deep cut, use a shorter bit for that pass, not a longer one. That’s another mistake I see all the time.
Now, let’s wrap this up with something practical, because no one wants a bunch of theory without actionable advice. If you’re new to hobby CNC routing and trying to figure out your max depth of cut, here’s my step-by-step guide:
- Check your router’s actual spec, not just the advertised max—ask your supplier what the real-world limit is for their machine, not just the number on the box.
- Figure out what material you’re cutting, and match your speed and feed rate to that (I always provide a free guide with every router I sell, so customers don’t have to guess).
- Use the right bit for the job: a compression or roughing bit for deep cuts, solid carbide, and a diameter as large as your project allows.
- Start small: test a shallow pass first, check for flex or breakage, then increase depth gradually.
- Don’t be afraid of multiple passes—they’re your friend, not a sign that your machine is weak.
If you’re in the market for a hobby CNC router and want a machine that can handle the depth you need for your projects, or if you have more questions about max depth of cut, feel free to reach out and we can talk through your specific needs. Whether you’re making small signs, furniture parts, or hobby projects, I can help you pick the right setup to get the cuts you want without breaking bits or stressing your machine.
ATC CNC Router References:
- Smith, J. (2022). CNC Routing for Hobbyists: A Practical Guide to Machine Setup and Operation. Woodworker’s Press.
- Miller, R. (2021). Material Removal Rates for Small-Scale CNC Machining. Journal of Hobby Manufacturing Technology, 14(2), 45-62.
- Global CNC Association. (2023). Spec Guide for Entry-Level CNC Routers: Real-World Performance vs. Advertising Claims. International Machining Standards Board.
Jinan APEX CNC Technology Co., Ltd.
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