Machine Travel & Table Size: How to Know If a Shop Can Handle Your Large Part
Every machine shop website has a page listing the industries it serves and the tolerances it can hold. Far fewer publish the actual travel, table size, and turning diameter of their equipment. That number is the one that actually tells you whether a shop can run your part, and buyers who skip past it often find out the hard way, mid-project, that a “large part specialist” cannot actually fit their component in the work envelope.
The Society of Manufacturing Engineers, the professional association serving manufacturing engineers since 1932, has long emphasized that machine tool selection is a matter of matching documented equipment capability to part requirements, not marketing language. That principle matters most when a part is large enough to push against a machine’s physical limits. This guide breaks down what travel and table size actually mean, and what questions to ask before you send a large part drawing out for quote. See FM Machine’s own large part CNC machining capabilities for a working example of how this applies in practice.
What Does “Machine Travel” Actually Mean?
Travel refers to the distance a machine’s axes can move the cutting tool or the workpiece. On a vertical mill, that’s expressed as X, Y, and Z travel, each representing the maximum distance the spindle or table can move in that direction. A machine with 60 inches of X travel and 30 inches of Y travel can, in principle, reach any point within that envelope, but the part itself also needs to physically fit on the table and clear the machine’s structure through its full range of motion. Travel numbers describe the machine’s reach. They do not automatically mean a part of that exact size will fit and machine cleanly, because fixturing, tool clearance, and table load capacity all factor in separately.
How Is Table Size Different From Travel?
Table size is the physical surface the part sits on, along with any fixturing. It’s usually smaller than the axis travel, since travel needs to extend past the table edges for the tool to reach mounting hardware and clamps. A shop quoting a large housing needs both numbers: enough table area to physically hold the part and its fixture, and enough travel beyond that to reach every feature that needs to be cut. A part that technically fits on the table but leaves no room for clamps, or that requires the tool to travel past the table’s edge to finish a feature, is a part that shop cannot actually run without redesigning the setup.
What Do Real Equipment Numbers Look Like?
Generic ranges are easy to publish and hard to verify. Real spec sheets are harder to fake and far more useful for a buyer comparing shops. The table below reflects actual machine capacities on FM Machine’s floor, spanning milling, turning, and grinding equipment relevant to large part work.
| Machine Type | Model | X Travel | Y Travel | Z Travel |
|---|---|---|---|---|
| Horizontal mill | Kuraki KBT-11W.A | 78.74″ | 59.09″ | 57.09″ |
| Vertical mill | Mori Seiki NV7000 | 60.60″ | 29.90″ | 26.00″ |
| Vertical mill | Hyundai-Kia VX750M | 61.00″ | 29.50″ | 28.30″ |
| 5-axis mill | DMG-Mori DMU65 | 28.90″ | 25.60″ | 22.00″ |
On the turning side, capacity is expressed differently: as maximum swing, maximum turning diameter, and part length rather than X/Y/Z travel. FM Machine’s CNC lathes run up to 36 inches of swing and 26 inches of turning diameter, with the largest manual engine lathe on the floor handling parts up to 120 inches in length. Grinding equipment holds tolerances to .00005 inch even on parts up to 59 inches long between centers.
Why Does This Matter More for Large Parts Than Small Ones?
A small bracket has margin. If a shop’s table is a few inches bigger than the part needs, that extra room doesn’t matter. A large gearbox housing or structural weldment has almost no margin. If the part is 58 inches long and the machine’s travel tops out at 55, there is no workaround that doesn’t involve re-fixturing mid-job, which reintroduces the exact alignment risk that finish machining is supposed to eliminate. Buyers sourcing large parts should treat travel and table size as a hard pass or fail filter before evaluating anything else about a shop.
How Do Buyers Verify a Shop’s Published Equipment List?
A published spec sheet is only useful if it reflects what’s actually on the floor and actually available for a given job. Machines get sold, upgraded, or reserved for other production runs, so a buyer should ask whether the specific machine listed is the one that would run their part, not simply the largest machine the shop happens to own. It’s also reasonable to ask for a photo of the part on the machine bed, or a reference to a prior job of similar size, since that confirms the shop has actually used that capacity in practice rather than listing it as a theoretical maximum. Shops that are confident in their equipment list generally have no hesitation sharing this kind of verification, while vague answers to a direct question about a specific machine are a warning sign worth taking seriously.
What Role Does Table Load Capacity Play Beyond Travel and Size?
Travel and table size describe geometry, but they don’t describe how much weight a machine can actually support and move without losing accuracy. A large casting or weldment can weigh far more than a comparably sized aluminum part, and every machine has a maximum table load rating that limits what it can safely hold, especially on a rotary or tilting table where weight affects both structural integrity and positioning accuracy. Exceeding that rating, or operating close to its limit, risks table sag, reduced positioning accuracy, and in worst cases mechanical damage to the machine itself. Buyers with unusually heavy large parts should confirm table load capacity as a separate question from travel and table size, since a part can fit the work envelope geometrically while still exceeding what the machine can safely support.
What Should You Ask a Shop Before Sending a Large Part Drawing?
A few direct questions upfront save weeks of back and forth later, and they tend to separate shops that genuinely run large parts regularly from those that occasionally stretch to accommodate one. Asking these questions before a formal quote also gives a shop the chance to flag any concerns early, when adjusting the plan is still inexpensive.
- What is the exact X, Y, and Z travel on the specific machine that would run this part, not just the largest machine in the shop?
- Does the part fit within table load capacity once fixturing and clamping hardware are accounted for?
- Can the part be machined complete in one setup, or will it require repositioning partway through?
- What is the maximum swing and turning diameter on the lathe that would handle any turned features?
- Has the shop actually run a part close to this size before, or would this be a first attempt at their equipment’s outer limit?
What Happens If a Part Is Bigger Than Any Single Machine’s Travel?
Occasionally a part genuinely exceeds what any machine on the floor can hold in one setup. In those cases, a capable shop will say so directly rather than force the part onto equipment that can’t reach every feature cleanly. The alternative, splitting the part into a multi-setup process with custom fixturing to re-establish datums accurately, is sometimes the right answer, but it should be a deliberate engineering decision made upfront, not something discovered mid-production because nobody checked the travel numbers first.
Getting an Accurate Answer
If you have a large part drawing and aren’t sure whether it fits standard shop equipment, send it to FM Machine directly. We’ll check it against our actual machine specs, not general capability claims, and confirm table load and fixturing requirements alongside travel and table size. That gives you a straight answer before you commit to a quote.