You Bought Your First CNC Machine. Here's Your Cutting Tool Game Plan.

The short list: tools that cover most of your first year

Match the tool's geometry to the material and the surface you care about, and most jobs get simple. Here's the starter kit for the work new shops actually run:

• Cutting sheet goods — plywood, melamine, laminated panels: a compression router. RobbJack's HB series (a 2+2 flute compression herringbone design for wood) cuts up on the bottom of the sheet and down on the top, so both faces come out clean in one pass. If your first machine is a router and your first jobs are cabinet or panel parts, this is the workhorse.
• Clean top faces and profiling in wood: a downshear (downcut) spiral like the WD1 series. It pushes chips — and cutting force — downward, so the top surface stays crisp and thin parts stay pressed to the table instead of lifting.
• Plastics (and general wood cutting): a straight-flute router like the GTS series, RobbJack's Tuffy-grade straight flute for wood and plastics. Straight flutes shear plastics without grabbing or melting the edge the way an aggressive spiral can.
• Aluminum: a dedicated aluminum end mill. RobbJack's FM and FMHV lines are built for it — geometry that evacuates soft, sticky aluminum chips instead of welding them to the flutes. Don't cut aluminum with your wood tools; it's the fastest way to ruin both the part and the cutter.
• If composites are in your future — fiberglass, carbon fiber, dense laminates: a multi-flute composite router like the 6- or 8-flute CE series. Skip this one until you actually have the work; add it the week you do.

How to read the numbers on a tool

Every tool listing boils down to four numbers. Once you can read them, spec sheets stop being intimidating:

• Diameter — the width of the cut. Bigger diameters are stiffer and remove material faster; smaller ones reach into tighter inside corners. A 1/4" and a 1/2" cover a lot of ground.
• Flute count — how many cutting edges wrap the tool. Fewer flutes (1–2) leave big open gullets for chip clearance: right for wood, plastics, and aluminum. More flutes give finer finishes and suit harder materials — but only if the chips have somewhere to go.
• Length of cut (LOC) — how much of the tool is actually fluted and able to cut. It needs to cover your material thickness, but not by much: extra length you don't need is rigidity you gave away.
• Shank diameter — the part your collet grips. It must match your collet exactly. Never partially insert a shank to "extend" a tool.

The five mistakes every new CNC owner makes

Every one of these is avoidable, and every new owner makes at least two. Get ahead of them:

• Guessing at RPM and feed rate. Spindle speed and feed rate work as a pair — each flute needs to take a real bite of material. Run the spindle fast with a timid feed and the tool rubs instead of cutting: heat, melted plastic edges, burned wood, dead tools. Get calculated numbers before the first cut (more on that below).
• Too much stickout. Every extra bit of tool hanging out of the collet multiplies deflection and invites chatter. Chuck the tool as short as the job allows, and pick the shortest length of cut that clears your material.
• Dull-tool denial. A dull tool rarely announces itself — it just starts fuzzing edges, burning, squealing, and pushing the machine around. If the tool cut better two weeks ago, it isn't your imagination. Running a dull edge "one more job" costs more in scrapped material than the replacement does.
• Wrong geometry for the material. An upcut spiral in melamine shreds the top face. A wood router in aluminum loads up and snaps. The tool that cut the last material beautifully can be exactly wrong for the next one — match the geometry, don't reuse whatever's in the spindle.
• Cheap-tool false economy. A bargain cutter that dulls in a fraction of the time, cuts oversize, or snaps mid-job doesn't save money — you pay for it in scrapped sheets and re-runs. Fewer, better tools beat a drawer full of disposables. Every standard RobbJack tool is made in the USA in Lincoln, California, and if you want proof before you commit, the test-tool program below exists for exactly that.

Stop guessing: get speeds and feeds for YOUR machine

The numbers in forum posts and YouTube videos came from someone else's machine — usually one with a stiffer frame and a stronger spindle than an entry-level router. RobbJack's free speeds-and-feeds engine at robbjack.com/speeds-and-feeds does this properly: pick your tool, your material, and your operation, and tell it what your machine can actually do. The recommendations are clamped to your machine's real spindle-speed and feed limits, so you get a starting point you can run today — not a lab number your machine can't reach.

Treat the output as your starting point, listen to the cut, and adjust from there. A healthy cut sounds steady; screeching means rubbing, hammering means chatter.

Free tools worth bookmarking

• robbjack.com/tools — the full catalog of 13,000+ USA-made standard tools, searchable by material and application, with free CAD downloads for fixture and toolpath planning.
• robbjack.com/speeds-and-feeds — calculated cutting parameters matched to your machine's limits.
• robbjack.com/machining-cost-calculator — see what cycle time and tool life actually cost per part, so tool decisions become math instead of vibes.
• robbjack.com/cross-reference — already have a tool number from another brand? Find the RobbJack equivalent.
• robbjack.com/try-a-test-tool — the guaranteed test tool program: try a RobbJack tool on your own machine, on your own parts, before you standardize on it.

You're not doing this alone

Your local cutting tool distributor is the front line — they stock tools, know the shops in your area, and handle your production orders. Behind them is RobbJack's applications support team: real engineers who will talk through your material, your machine, and your part, and point you at the right tool and parameters. Call (800) 527-8883, or start with the test-tool program and let the results make the argument.

Everyone in this industry started with a first machine and a first ruined sheet of plywood. Ask the questions. The people who answer them have heard every one before.