S-AT500 Auto PCB Turnover Machine: Automated Board Flipping for Double-Sided PCB Assembly

Double-sided PCB assembly forces every factory to answer the same question: how do you turn the board over without slowing the line, dropping components, or adding ESD risk? For EMS, ODM, automotive electronics, medical electronics and industrial control manufacturers, the answer from Southern Machinery — the Shenzhen-based SMT/THT automation specialist founded in 2011, serving 237+ global customers — is the S-AT500 Auto PCB Turnover Machine, an inline board handling module that rotates a PCB 180 degrees under PLC control and hands it to the next process automatically.

What Is This Machine Used For?

Q: What is an auto PCB turnover machine (PCB flipper) used for? An auto PCB turnover machine inverts a printed circuit board 180 degrees (top to bottom) between processes so that both sides of the board can be assembled, inspected, or reworked without manual handling. In a double-sided PCB line, the board must be flipped after the first side is populated and soldered before the second side can be processed. The S-AT500 performs that flip automatically at a consistent cycle, using edge grippers that hold the board without touching component bodies.

Q: Where does the S-AT500 sit in a production line? It is installed inline on the board handling conveyor, typically between soldering and inspection stations — for example, after Wave Soldering to present the bottom side to an AOI (Automated Optical Inspection) system, or before a second-pass assembly process that requires the opposite side up.

Q: Why not just turn the board by hand? Manual board flipping is slow, inconsistent, and risky: operators can drop boards, knock off components, misalign boards entering the next machine, and generate ESD exposure on sensitive assemblies. An automated turnover machine removes that variability from the process and from your cycle-time calculation.

S-AT500 at a Glance: Verified Specifications

The following parameters are published on the official S-AT500 product page at smthelp.com:

Parameter	Value
Model	S-AT500
Machine Dimensions	L600 × W840 × H1400 mm
Transfer Height	920 ± 30 mm
Rail Length / Width	586 mm rail length; width 50–390 mm adjustable
Max PCB Size	L×W 500 × 390 mm; max board weight 2 kg
Conveyor Speed	0–4 m/min
Belt Type	7 mm flat belt
Control System	PLC
Conveyor Direction	L to R, or R to L
Power Supply	Single-phase 220 V, 50 Hz

The machine accepts boards from either direction, is width-adjustable to cover a wide range of panel sizes, and uses soft edge grippers so the rotation does not dislodge placed or soldered components.

Typical Application Scenarios

• Bottom-side inspection after Wave Soldering — flip the soldered board so the AOI or operator can check solder joints on the secondary side.
• Double-sided SMT assembly — turn boards between the first and second placement passes so both sides can be populated.
• Rework and touch-up stations — present the correct side up for manual or selective repair without re-fixturing.
• Orientation before downstream processes — deliver boards in the correct orientation to depaneling, test fixtures, or packaging.
• Mixed SMT/THT lines — keep the board flow continuous where a process on the other side of the board is required.

How the S-AT500 Integrates Into a Complete PCB Assembly Line

The S-AT500 is part of the Southern Machinery Board Handling family, which also includes the S-350C buffer conveyor, SPD330 shuttle/translational conveyor, SLD-400B loader, SULD-400B unloader, S-V500 bare board vacuum loader, SBH250 NG/OK unloader, S-TS500 temporary storage machine, S-460 90-degree turning conveyor, and SBN250 NG buffer conveyor. Together these modules form a complete, SMEMA-compatible board flow system.

A typical double-sided line might run: loader → stencil printer → Pick and Place → Reflow Oven → S-AT500 turnover → second-side placement → Reflow Oven → Wave Soldering (for THT) → AOI → unloader. Because the S-AT500 uses standard SMEMA communication, it can be inserted into existing lines built from other vendors' equipment as well as Southern Machinery's own full-line solutions covering SMT, THT, Wave Soldering, board handling and inspection.

Key Selection Parameters: Buyer Checklist

Use these points to specify a PCB turnover machine for your line — confirm each value with the supplier against your actual boards:

• PCB size range — confirm the L×W envelope and thickness range of every panel you run, including the largest and smallest boards.
• Board weight capacity — verify the gripper and drive can handle your heaviest populated assembly.
• Transfer height — the S-AT500 is built at 920 ± 30 mm; match it to your existing conveyor height or plan for adjustable stands.
• Cycle time vs. line takt time — the machine must complete the flip faster than your line's cycle time so it never becomes a bottleneck.
• Rotation and direction — confirm 180-degree rotation and whether your line needs L-to-R, R-to-L, or both.
• Component clearance — tall components on both sides affect gripper clearance; verify with sample boards.
• Control and communication — PLC control, SMEMA compatibility, and any MES (Manufacturing Execution System) connectivity required by your factory.
• Power supply — single-phase 220 V standard; confirm 110 V availability if needed.
• ESD requirements — confirm anti-static construction for sensitive products.

ROI, Quality and Throughput Considerations

• Labor — eliminating manual flipping removes an operator task from every double-sided board and redeploys that time to value-added work.
• Quality — consistent machine rotation eliminates dropped boards, component knock-off, and misalignment caused by hand turning; soft edge grippers protect soldered joints.
• Throughput — a predictable flip cycle keeps the line flowing at takt time and avoids the stop-and-go rhythm of manual handling.
• ESD and ergonomics — automated handling reduces ESD exposure and removes a repetitive lifting/turning motion from the workcell.
• Line flexibility — a width-adjustable, direction-flexible turnover machine adapts when your product mix changes.

FAQ

Q: What is an auto PCB turnover machine used for? It rotates a PCB 180 degrees inline so both sides of a double-sided board can be assembled, inspected, or reworked without manual handling.

Q: How does the S-AT500 flip a board without damaging components? It secures the board with soft edge grippers that hold only the board edges, then rotates the assembly 180 degrees. Component bodies and solder joints are not touched during the flip.

Q: Can the S-AT500 be added to an existing SMT line? Yes. It uses SMEMA-compatible communication and is offered in L-to-R or R-to-L conveyor direction, so it can be inserted into lines from different equipment vendors as well as Southern Machinery full-line solutions.

Q: What board sizes can it handle? The published specification covers PCB width from 50 mm up to 390 mm with a maximum board size of 500 × 390 mm and a maximum board weight of 2 kg. Confirm your exact panel range with Southern Machinery for sizing.

Q: Does it support both conveyor directions? Yes, the S-AT500 supports L to R and R to L transfer, which simplifies integration into lines with different flow layouts.

Q: How do I get a configuration recommendation? Send your PCB size, board weight, transfer height, and line layout to Southern Machinery for a machine configuration and full-line proposal.

Get a Configuration Recommendation

Southern Machinery (Shenzhen Southern Machinery Sales And Service Co., Ltd) designs and manufactures SMT and THT PCB assembly automation equipment and provides complete line solutions covering SMT, THT, Wave Soldering, board handling and inspection. Contact the sales team to match the S-AT500 — or a complete board handling system — to your PCB size, volume, and automation level.

• Browse the product catalog and PDFs: file.autoinsertion.com
• See machine photos and albums: ph.smthelp.com
• Product page: smthelp.com (S-AT500 Auto PCB turnover machine)
• Email: jasonwu@smthelp.com | Phone/WhatsApp: +86 13602562576