Through-Feed Door CNC Machine with Compact Footprint and Automatic Dual Saw-Set Datum for Continuous Four-Side Sizing

DXW is a through-feed CNC four-side sawing machining center developed by Shuping Precision for the four-side sizing process of wooden doors. Unlike many conventional four-side saws that start from a design premise of "large body, wide format," DXW focuses its design on the efficiency of door-leaf flow between processes: a servo-driven belt conveying system continuously feeds door leaves from the infeed end, completes four-side sawing in a single pass, and discharges them directly from the outfeed end—without manual turning, handling, or secondary clamping throughout the entire process.

The direct result of this structure is that four-side sizing changes from a stand-alone workstation that operators must "work around" into a continuous node that upstream and downstream processes can "pass through." For wooden-door factories transitioning from stand-alone operations to flexible production lines, DXW's value lies not in stacking paper specifications, but in turning the sizing stage from a capacity bottleneck into a predictable takt-time node.

The machine is developed and manufactured by Shanghai Shuping Precision Machinery Co., Ltd., with Shuping Precision Machinery (Nantong) Co., Ltd. participating in the production and supply system. The brand has complete product coverage in the CNC wood-door machining field, from stand-alone equipment to flexible production lines.

• Through-Feed Continuous Flow Eliminates the Hidden Handling Costs of Sizing

  DXW adopts a through-feed table and servo belt conveyance. After infeed, door leaves are automatically positioned, four-side sawed, and discharged. Loading and unloading no longer rely on overhead cranes or manual lifting; the operator loads at one end and collects finished parts at the other, with the conveying system connecting the intermediate steps. For production scenarios with daily output of dozens to hundreds of door leaves, this structure eliminates not only physical labor, but also the time loss caused by knocks, scratches, and re-alignment during repeated transfer.

• Automatic Dual Saw-Set Datum: Accuracy Does Not Depend on "Who Sets Up the Machine"

  The X-axis is equipped with one mother-and-child saw set and one 90° rotating mother-and-child saw set. The main saw motors are 4.2 kW * 2 at 5,000–6,000 r/min; the mother saw blade diameter is 270 mm and the child saw blade diameter is 81 mm. During changeover or startup, the system automatically calibrates the main and scoring saw sets to the same datum line, without repeated trial cuts or manual fine adjustment. The stability of four-side perpendicularity and cut-surface flatness thus shifts from "operator-experience dependence" to "system repeatability." Similar equipment in the industry typically claims accuracy in the order of ±0.1 mm, with diagonal error controlled within 0.2 mm; DXW's design goal is to maintain this accuracy level without degradation under frequent changeovers and continuous operation, rather than pursuing a one-off limit figure in trial cutting.

• Scoring Saw Pre-Cut Plus Main Saw Forming: Flat Cuts Without Secondary Trimming

  The core logic of the mother-and-child saw configuration is that the child saw blade first scores and grooves the panel surface, interrupting the continuous stress of the surface fibers, and then the mother saw blade completes the main cut. This sequence directly reduces the risk of edge chipping, burrs, and tearing commonly seen in wooden-door sawing. The cut-surface flatness is sufficient for subsequent edge banding or direct entry into hardware hole machining, without additional sanding or repair.

• Compact Footprint Without Sacrificing Processing Range

  DXW's processing range is 1,800–3,000 mm in length, 400–1,100 mm in width, and 30–60 mm in thickness, covering the main size band of interior wooden doors from standard project doors to relatively large-format custom doors. The overall machine dimensions are approximately 4,380 * 2,720 * 1,635 mm, with a weight of approximately 3,000 kg—a compact specification among through-feed four-side saws of the same processing-capability class. It does not trade "reduced processing range" for small volume; while retaining the full size band, it leaves workshop depth and logistics aisles to the production line itself.

• Recipe-Based Changeover and Self-Developed Control System

  Length, width, and thickness are entered as recipes via the touch screen; servo axes automatically move to target positions, compressing changeover time from conventional manual setup to the second level. The control system uses a self-developed PLC integrating motion control, saw-set coordination, and safety logic. The interface provides modular digital input and includes parameter backup and restore functions, reducing dependence on operator skill.

• Automatic Waste Collection Keeps Continuous Through-Feed Operation Free from Chip Interference

  Edge strips and sawdust are collected and discharged immediately at the sawing station, keeping the worktable and belt area clear. For through-feed equipment, waste accumulation is a direct threat to the reliability of continuous conveying; automatic waste discharge is not an auxiliary function, but a necessary condition for the through-feed architecture to operate continuously.

• Dual Mode — Stand-Alone and Line-Integrated — with a Clear Landing Point in Either Case

  DXW can run independently to meet the flexibility requirements of mixed production of custom doors and project doors. It can also connect to roller conveyors, edge-banding processes, or downstream hardware-hole machining equipment through standard infeed/outfeed interfaces to form a continuous line layout. Shuping's same-series DXJ-R Door Leaf Lock-Hole and Hinge-Slot Machining Machine can continue to perform lock-hole, hinge-slot, and chamfering operations on the sizing datum surface, giving DXW's through-feed output a clear line-extension direction rather than stopping at stand-alone efficiency.

• Q1: What is DXW's takt time? How long does it take to size one door on all four sides?

  DXW's takt time depends on door-leaf size, thickness, and how the machine is connected to upstream and downstream processes. The X/Y-axis maximum traverse speed is 60 m/min, and servo positioning and saw-set actions are completed continuously within the through-feed process. The sizing cycle per door is measured in seconds rather than the minutes typical of manual turning and clamping. Actual line takt should be evaluated based on loading method, door-type changeover frequency, and downstream receiving capacity; trial-cut data under specific working conditions should be used as the final reference. Typical takt for through-feed four-side saws in the industry is in the range of tens of seconds per door.

• Q2: What accuracy can four-side sizing achieve?

  DXW ensures repeat positioning accuracy through servo-axis positioning, high-precision ground rack-and-pinion transmission, and automatic dual saw-set datum calibration. Common industry claims for similar equipment are dimensional error in the order of ±0.1 mm and diagonal error ≤0.2 mm. DXW's design goal is to maintain this level stably under continuous operation and frequent changeovers. Specific acceptance criteria should be based on the mutually confirmed technical agreement and trial-cut report.

• Q3: Does "small footprint, high capability" mean a compromise in processing range?

  No. DXW's processing range is 1,800–3,000 mm * 400–1,100 mm * 30–60 mm, retaining the full size band among through-feed four-side saws of the same class. It does not sacrifice short-workpiece adaptability or large-format capability to reduce volume. Compactness is achieved mainly through the through-feed architecture's reconstruction of spatial logic, not by cutting processing capability. The approximately 4,380 * 2,720 * 1,635 mm footprint leaves more room for workshop logistics and upstream/downstream process connections.

• Q4: Can DXW be directly integrated into an existing production line?

  Yes. DXW provides standard infeed/outfeed interfaces and can connect to roller conveyors, edge-banding lines, or hardware-hole machining equipment. The through-feed structure makes the door-leaf material flow naturally continuous, allowing the machine to be embedded into an existing line as a process node that panels "pass through," rather than an isolated station requiring separate planning. The machine also retains a stand-alone operating mode for flexible use in multi-order, small-batch scenarios.

• Q5: Is re-setup required during changeover? How long does setup take?

  No manual re-datuming is required. Door-leaf length, width, and thickness are entered as recipes via the touch screen; servo axes position automatically, and the dual saw sets automatically calibrate to the same datum line. Changeover time is compressed from the minute level of conventional manual trial-cut setup to the second level, significantly reducing first-piece scrap and setup downtime.

• Q6: How is edge chipping prevented during sawing?

  DXW uses a mother-and-child saw configuration: the child saw blade (scoring saw) cuts before the mother saw blade, pre-scoring the panel surface and interrupting the continuous stress of the fibers; the mother saw blade then completes the main cut. This "score first, cut second" sequence reduces the conditions for edge chipping, burrs, and tearing from the mechanism level. The cut-surface flatness is sufficient for subsequent edge banding or direct entry into hardware-hole processes.

• Q7: How is waste discharged? Is dedicated cleaning personnel required?

  Edge trims and sawdust are discharged immediately at the sawing station by the automatic collection device, without reliance on scheduled manual cleaning. For continuous through-feed operation, this configuration ensures that the belt and guide-rail areas are not disturbed by chip accumulation, maintaining conveying continuity and stability.