When a CNC won't tell you its cutting area
Why some of our best-covered machine pages carry no score
The single specification a buyer checks first is how big a part the machine cuts, and it is one some manufacturers never print. When it is missing we leave it blank and the page carries no score, rather than deriving a number from the machine's name. The worked example below is the Shapeoko 5.1 Pro 4x4, a $3,800 machine that is one of the best-regarded desktop CNC routers on the market and whose cutting travel we could not find in any document Carbide 3D publishes - but the rule is the same for every maker.
What Carbide 3D does publish
A great deal, and much of it better than its competitors. The drive system is specified precisely: 16mm ballscrews with a 20mm pitch on X and Y, a 16mm 10mm-pitch ballscrew on Z, HG-15 linear rails on every axis, and a stated ballscrew accuracy of ±50µm per 300mm. Z travel is given as 6 inches (155mm) with 4 inches of clearance under the gantry. Step length is quoted to three decimal places. Pricing is transparent across all four variants, from $3,550 for the 4x2 without legs to $4,150 for the 4x4 with them.
They are also unusually honest about what is not in the box. The machine ships without a spindle: you supply a 65mm trim router or a VFD spindle yourself. Most makers bury that. Carbide 3D puts it under a heading called “what you need to provide”.
Which makes the omission stranger. The single specification a buyer checks first - how big a piece can I cut - is the one we could not find.
Where we looked
In order: the product page on their shop, the Shapeoko landing page, the dedicated Shapeoko 5 Pro specifications page, the product manual index, and the launch blog post. The specifications page is the closest thing to an answer - it has a table with a column headed Machine Travel (X) x (Y), sized per variant. The column headers are there. The numbers are not in the served document.
The launch blog lists the sizes as “Shapeoko 5 Pro 4x4 - 48″ x 48″”. That is the nominal size of the machine, the same 4 feet the product name already tells you, and it is not the same thing as cutting travel.
Why we will not just convert 4 feet into 1,219mm
It would take one line of code and it would be wrong. The tempting assumption is that travel is a bit less than nominal size - you lose some envelope to the gantry, the clamps and the spoilboard - so a conservative derived figure would at worst understate the machine.
That assumption is false, and Carbide 3D's own numbers disprove it. Their specification sheet for the 2x2 shows a maximum horizontal machine travel of 24.53″ against a 24″ nominal size. The machine travels further than its name implies, not less.
So the error does not even run reliably in one direction. A derived figure would not be a cautious estimate; it would be a guess wearing the clothes of a measurement, printed in a spec table next to figures we actually transcribed from a manufacturer. On a site whose entire argument is that you can check where every number came from, that is the one thing we cannot do.
What we do instead: record Carbide 3D's own designation verbatim, label it as their designation, exclude it from scoring, and let the coverage figure carry the consequence. The Shapeoko 5.1 Pro page shows “Insufficient published data to score” and names the four components we could not compute. Everything else on that page - the full specification with the gaps marked, the tier, the price, the buying route, what the build also needs — is intact.
What to ask before you order
None of this means do not buy the machine. The mechanical specification Carbide 3D does publish is genuinely strong, and ballscrews plus HG-15 rails on every axis at this price is not a compromise. It means ask two questions first.
Ask for the actual X and Y travel in inches or millimetres for the variant you are buying, in writing, and ask whether that figure is measured to the spoilboard edge or to the physical limit of motion - those differ, and the second is not usable. Then measure the largest part you have genuinely needed to make in the last year and compare against the first number, not the machine's name.
Ask what the usable envelope becomes once workholding is on the bed. Clamps, a dust shoe and the spoilboard each take a bite, and on a machine bought for sheet goods the difference between “fits” and “nearly fits” is the whole purchase.
This will happen again
Carbide 3D is not unusual and this is not a complaint about them specifically - they publish more than most, which is part of why the gap is worth writing about. Sparse published specification is the norm at the top of the desktop market, where machines are sold on reputation and community rather than on a comparable sheet. As we add the rest of that tier, expect more pages to carry no score for the same reason.
A machine can be thoroughly covered and unscored at the same time. The score is one element of a page, not its purpose - and an honest blank is worth more than a confident number nobody can check. The full rule is on the methodology page.