Southern Machinery THT Auto Insertion Machine: Built for Smart EMS PCB Assembly

Watch the machine in action — 40-second factory demo of the THT auto insertion platform:

What Is This Machine Used For?

A THT auto insertion machine places through-hole (THT) components onto PCBs automatically — replacing hand insertion on the DIP line. It picks components from tape feeders, vibration bowls, or tube feeders, forms and positions their leads, inserts them through the drilled holes in the PCB, and clinches the leads underneath so boards stay stable before soldering.

The machine shown in the demo belongs to Southern Machinery's S-3010 series radial insertion platform — the workhorse of the company's THT automation family. It is a servo-driven, vision-corrected radial inserter built for tape-packed radial-lead components: capacitors, transistors, LED lights, and key switches. The S-3010B (off-line version) supports single-, dual-, triple-, and quad-span variants with lead spans of 2.5 / 5.0 / 7.5 / 10.0 mm, inserts at any angle from 0° to 360° in 1° increments, and clinches leads to a programmed depth (clinch length 1.5–2.2 mm, clinch degree 10–35°) so components sit consistently flat on the board.

Why EMS factories buy this class of machine is straightforward: manual DIP insertion is the last labor-intensive island in an otherwise automated line. Operators are hard to hire and train, quality drifts with every shift change, and throughput is capped by headcount. An auto insertion machine turns that variable cost center into a predictable, repeatable process — which is exactly what “smart EMS factory” means in practice.

Typical Applications

THT auto insertion machines are used wherever boards carry radial-lead or other through-hole components in volume. Real production scenarios include:

Power supplies and adapters — large radial electrolytic capacitors and rectifier diodes on switch-mode PSU boards, where manual insertion is slow and lead-clinch quality directly affects solder joint reliability.
LED lighting and display boards — LED lamps, radial capacitors, and key components on lighting driver and luminous-character control boards; high board volume per SKU makes automation economics favorable.
Home appliance control boards — air conditioners, induction cookers, rice cookers, electric kettles, and microwave ovens, where key switches, transistors, and radial capacitors repeat across many PCB variants.
Automotive electronics — car audio, vehicle power supplies, and dashboard modules, where consistent, inspectable THT joints matter for reliability and warranty cost.
Energy-saving lighting and ballast — industrial and outdoor lighting, street lamps, and floodlight drivers that combine THT power components with SMT control circuitry on the same board.

In each case, the pattern is the same: standard radial-lead component families, medium-to-high volume per SKU, and quality requirements that make manual insertion a liability.

How It Fits Into a Complete PCB Assembly Line

A THT insertion machine is not an island — it is a station inside a mixed-technology line. The typical flow for a board with both SMT and THT content:

SMT placement → reflow → (THT insertion: radial + odd-form + pin/terminal) → wave soldering → cleaning → inspection (AOI/SPI) → depaneling → final assembly

Southern Machinery builds the ecosystem around that flow, so a buyer can source the insertion station and its neighbors from one supplier:

Radial insertion — S-3010B (off-line) and S-3000 automatic radial insertion machines for tape-packed radial components.
Odd-form insertion — S-70LD vision-guided inline station for non-standard parts (transformers, relays, connectors, fuse holders, terminal blocks) that don't fit radial or axial tape; it accepts boards via SMEMA handshake and sits directly upstream of the wave solder machine.
Pin and terminal insertion — the S7020 series for pin/eyelet terminals at higher throughput, with inward/outward clinching.
Downstream soldering — S-WS450 and S-WS350B lead-free dual-wave soldering machines that take the inserted boards through turbulent and laminar waves.
Support equipment — board handling (loaders, unloaders, conveyors), stencil cleaning, SMT reel scrap cutters, X-ray chip counters for inventory control, and custom SMT nozzles and feeders.

Choosing a supplier that covers the whole chain matters for integration: conveyor heights, SMEMA signaling, control interfaces, and spare-parts availability all line up when the insertion station, wave solder, and board handling come from the same design house.

Key Selection Parameters

Buyers should evaluate a THT insertion machine against their own board mix. The parameters that decide the right configuration:

Component mix and lead spans — radial span capability (e.g., 2.5 / 5.0 / 7.5 / 10.0 mm variants), odd-form part size and height range, or pin/terminal gauge for the S7020 class. Match the machine to the components you actually load, not the full catalog.
Throughput — rated speed versus realistic actual speed for your lead spans and clinch settings. Rated CPH (e.g., the S-3010B's 22,000 CPH rating) is quoted at ideal conditions; ask for actual-speed figures on your components.
PCB format — board width and length limits, thickness range, and whether panelized boards pass through cleanly.
Insertion direction and clinch — 0°–360° insertion in 1° steps, and the clinch type (e.g., “N”-type clinch base) that suits your solder process and wave pallet design.
Vision correction — lead-position correction and polarity checks that prevent misinsertion and reversed components before they reach the solder joint.
Feeder configuration — number and type of feeders (tape, vibration bowl, tube), changeover time between SKUs, and component-family coverage.
Line integration — off-line (standalone, one operator) versus inline (SMEMA handshake, conveyor-connected) configuration, and compatibility with your existing wave solder and board handling.
Utilities and footprint — power supply (e.g., 220V single phase), air pressure/consumption, machine size and weight versus floor space.
After-sales support — spare parts availability, training, and service response, especially for a machine that will run two or three shifts.

ROI and Quality Perspective

From a buyer's standpoint, the business case rests on three numbers: labor cost per board, rework rate, and field failure cost.

Manual insertion cost is dominated by labor: hiring, training, turnover, and supervision. It scales with headcount, and headcount scales with volume — a bad combination for a growing EMS business. An auto insertion machine converts that into a fixed equipment cost with a predictable CPH. Southern Machinery's official S-3010B product page states the cost-reduction claim at up to 40%; treat that as a directional manufacturer claim and model your own numbers with your labor rates and board mix.

Quality is where automation pays twice. A vision-corrected, servo-driven head seats every lead to the programmed depth, eliminating the classic manual defects: floating-high components, missing leads, misinserted parts, and reversed polarity. Fewer defects at insertion means fewer boards pulled for rework (which costs minutes per board and risks pad damage), and fewer field failures — the most expensive failure class in electronics, with costs far beyond the board itself.

Finally, think about the smart-factory angle: a machine with industrial-PC control and an English or Chinese operator interface (as on the S-3010B) feeds line data and program management that supports MES integration and fine product management — the difference between a DIP line you manage by clipboard and one you manage by data.

FAQ

What is a THT auto insertion machine?

A THT (through-hole technology) auto insertion machine automatically places through-hole components — parts with wire leads that insert through holes in the PCB — instead of hand insertion. It feeds, forms, inserts, and clinches leads, typically on the DIP line ahead of wave soldering.

What components can a THT insertion machine handle?

Radial-lead components such as capacitors, transistors, LED lights, and key switches are the standard workload for machines like the S-3010 series (lead spans 2.5 / 5.0 / 7.5 / 10.0 mm). Other machines in the family cover axial components, odd-form parts (transformers, relays, connectors), and pin/eyelet terminals.

How fast is a THT insertion machine?

It depends on the platform and component. For reference, the Southern Machinery S-3010B radial inserter is rated at 22,000 CPH with an actual operating speed of about 13,000 CPH on typical lead spans — ask the supplier for actual-speed figures for your specific components before committing.

Can a THT insertion machine work with an existing wave soldering line?

Yes. Off-line models like the S-3010B run standalone with one operator; inline models like the S-70LD odd-form inserter connect to the conveyor via SMEMA handshake and sit directly upstream of wave soldering, so boards flow from insertion to solder without manual handling.

What is the difference between radial and odd-form insertion?

Radial insertion machines handle standard radial-lead components in tape format at high speed. Odd-form insertion machines handle non-standard parts — transformers, relays, connectors, fuse holders — that don't fit radial or axial tape, using vision guidance to locate and orient each part regardless of presentation.

How do I get a catalog or quote for a THT insertion machine?

Contact Southern Machinery directly: email jasonwu@smthelp.com or call/WhatsApp +86 13602562576. Product catalogs are available at file.autoinsertion.com, and product images and albums are hosted at ph.smthelp.com.

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Talk to the Southern Machinery Team

Southern Machinery (Shenzhen Southern Machinery Sales And Service Co., Ltd) designs and manufactures SMT and THT automation for PCB assembly. Founded in 2011 in Shenzhen, China, the company serves 237+ global customers across EMS, lighting, power supply, appliance, and automotive electronics, and positions itself as the smart EMS factory partner.

Whether you are replacing a manual DIP line or adding capacity to an existing one, the team can walk you through radial, odd-form, and pin insertion platforms, wave soldering, and board handling — and send the catalog and machine images so you can evaluate before you commit.

Email: jasonwu@smthelp.com
Phone / WhatsApp: +86 13602562576
Catalog downloads: https://file.autoinsertion.com
Product images & albums: https://ph.smthelp.com
Website: https://www.smthelp.com