{"id":594,"date":"2026-10-21T13:48:21","date_gmt":"2026-10-21T05:48:21","guid":{"rendered":"http:\/\/www.phukienhonda.com\/blog\/?p=594"},"modified":"2026-10-21T13:48:21","modified_gmt":"2026-10-21T05:48:21","slug":"what-is-the-maximum-depth-of-cut-of-a-hobby-cnc-router-4053-5b03f0","status":"publish","type":"post","link":"http:\/\/www.phukienhonda.com\/blog\/2026\/10\/21\/what-is-the-maximum-depth-of-cut-of-a-hobby-cnc-router-4053-5b03f0\/","title":{"rendered":"What is the maximum depth of cut of a hobby CNC router?"},"content":{"rendered":"

If you\u2019ve ever sat in a workshop staring at a small hobby CNC router, wondering why some bits struggle to cut through \u00bd-inch MDF while others zip through 1-inch solid oak, you\u2019ve asked the same question I get a hundred times a month as a hobby CNC router supplier: what\u2019s the real maximum depth of cut for these machines? I don\u2019t just give a generic number when a customer asks\u2014because the truth is, there\u2019s no one-size-fits-all answer. It\u2019s a mix of what your router can handle, what you\u2019re cutting, and how you set it up, and today I\u2019m 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<\/a><\/p>\n

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First, let\u2019s 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\u2019t etched in stone on a spec sheet. Most entry-level hobby CNC routers\u2014think the ones I sell to makers, small woodworkers, and hobbyists who don\u2019t want to drop $10k+ on industrial gear\u2014have a standard spec that tops out around 1 to 2 inches of depth for most common materials. But wait, that\u2019s only if everything else lines up wrong. I\u2019ve 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 \u00be-inch MDF because they picked the wrong bit and ran it too fast.<\/p>\n

Let\u2019s 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\u2019s between 1.5HP and 3HP. A 1.5HP spindle is great for small projects, but it\u2019s 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\u2019s the gantry and frame rigidity. If your router\u2019s frame wiggles when you press a little extra pressure on the bit, you\u2019re not going to get a deep cut\u2014you\u2019ll get a wobbly edge, or worse, a bit that snaps. I\u2019ve 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\u2019t hold the path straight. That\u2019s why when I help someone pick a router, I don\u2019t just ask what their max depth is\u2014it\u2019s what their project max depth is, and what material they\u2019re cutting.<\/p>\n

Next up, the material you\u2019re 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\u2014you\u2019d be lucky to get \u00bd-inch deep in a single pass with a hobby machine on oak. Then there\u2019s things like composite materials, acrylic, or even aluminum. Aluminum is a whole different beast; even a 3HP hobby router can only handle about \u00bc-inch depth of cut in aluminum in single passes, because it\u2019s 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 \u00bc-inch end mills before he realized he needed to break that cut into smaller passes.<\/p>\n

Then there\u2019s 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\u2014larger diameter bits (like \u00bc-inch or \u00bd-inch) are more stable and can handle deeper cuts than tiny \u215b-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\u2019s speed and feed rate. If you run your spindle too fast and your router too slow, you\u2019re 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\u2019s about 100 to 150 inches per minute, for oak it\u2019s 50 to 70 IPM. Mess that up, and your max depth of cut will be half of what it could be.<\/p>\n

Wait, let\u2019s 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\u2019s 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\u2019re forcing too much material, and the bit can\u2019t 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\u2019s just a rough estimate. That small step can make a huge difference in how deep you can go without issues.<\/p>\n

Now, let\u2019s get to the practical numbers, because everyone wants to know what they can actually do with a hobby CNC router. I\u2019m not here to brag about industrial specs\u2014this is for hobby machines, the ones my customers actually use. For most entry-level 1.5HP hobby CNC routers, here\u2019s a rough breakdown of max depth of cut per pass (remember, that\u2019s not total material thickness you can cut, that\u2019s how much you remove in one go; if a material is thicker than that max depth, you just do multiple passes):<\/p>\n