S7020T PIN Eyelet Terminal Inserter: How to Correct the Machine's Head Insertion Position

A THT auto insertion machine only holds its insertion yield while the insertion head stays exactly where the program expects it to be. Board after board, the head has to bring a PIN, eyelet or reel-fed terminal to the same hole, at the same angle, at the same depth, and hand it over to the clinch tooling underneath. When that position drifts — even by a fraction of a millimetre — the machine does not stop. It keeps running and produces a slowly growing pile of bent terminals, pushed-through holes and rework.

This article follows Chapter 5 of Southern Machinery's S7020T training series, "How to correct the machine's head insertion position." The chapter is a maintenance and setup lesson, not a sales demo: it shows an operator or line engineer how to bring the insertion head back to the correct position on a PIN / eyelet terminal insertion machine. Below is the practical context around that correction — what it changes, why the position moves, and how to tell a head-correction job from a genuine process problem.

The training chapter is embedded below.

Direct link: watch Chapter 5 of the S7020T training series on YouTube

What is this machine used for?

The machine in this chapter is the S7020T, the terminal-insertion configuration of Southern Machinery's S7020 Series PIN Eyelet Terminal Insertion Machine. It is a THT (through-hole technology) auto-insertion machine: it feeds PINs, eyelets and terminals — from a vibration bowl feeder or from reel — carries each part to the programmed hole on the PCB, inserts it to depth, and clinches the lead so the board can move on to wave soldering.

On the documented S7020 Series specification, the platform is built around two insertion heads, a 12,000 CPH speed class, an insertion angle of 360° in 1° increments, motion accuracy of 0.001 mm/pulse, and a vertical error of ≤0.8°, with terminals from 0.5 mm to 1.2 mm in thickness and an insertion hole sized 0.5 ± 0.1 mm larger than the component lead. Bulk and reel terminal packaging are both supported, and the PCB working area is documented at 380 mm × 280 mm, with enlarged sizes available as a customization.

"Correcting the head insertion position" is the maintenance procedure that restores the geometric relationship between three things:

the insertion head — the assembly that holds the terminal in its jaw guide and drives it down;
the CTA (component transfer assembly) — the shuttle that transfers a single terminal into the head; and
the board and its tooling — the X/Y table position, the rotary/insert axis height, and the PCB location tooling pins.

Because those three must agree every cycle, head positioning is not one adjustment but a small family of them. In the maintenance documentation Southern Machinery publishes for insertion platforms, the head position group typically includes the head casting height, the head centering, the jaw guide gap (free movement without play), the insert height, and the CTA-to-head alignment — plus re-verification after any head removal, because the head must be taken off the machine to be serviced.

If the head is left mis-positioned, the failure modes are predictable: the terminal tips into the hole instead of dropping into it, the jaw guide "wanders" during insertion, the CTA and the components already on the workboard interfere, or the terminal is clinched off-centre with inconsistent lead protrusion.

Why the head insertion position drifts

Understanding the causes is what separates a five-minute correction from a week of chasing defects:

Service work on the head. The insertion head assembly has to be removed and disassembled for maintenance — shaft clamp, tooling pin, jaw guide, actuator, springs and pusher tip all come apart. Reinstalling the head without re-checking centering and alignment is the single most common reason a machine that ran perfectly before the service now inserts badly.
Crashes and jams. A blocked terminal, a mis-fed part or a board loaded off the tooling pins puts a mechanical shock through the head. Position shifts, and the shift rarely announces itself with an alarm.
Tooling and product changeover. Different terminal types use different pusher tips, jaw tooling and anvils. A tooling change that is not followed by a position check leaves the machine set up for the previous part.
Wear. Guide jaws, rollers, springs, clinch anvils and location pins wear gradually. Position tolerances that were in spec when the machine shipped slowly move out of spec — which is why a documented preventive-maintenance interval matters more than reacting to a defect spike.
The CTA and carrier-clip chain. If the shuttle that presents the terminal to the head is out of alignment, the head itself is blamed. Alignment between CTA and head, and the clip/CTA standards on the transport chain, belong in the same correction sequence.

Typical applications

Terminal insertion with a corrected, repeatable head position pays back wherever PINs, eyelets and terminals are part of a volume board:

1. Power tools and power boards. Terminal and PIN insertion is a core process in power tool electronics, where heavy-current terminals must be inserted and clinched to survive vibration and thermal cycling. This is the reference application for the S7020T's dual-head terminal-insertion configuration.

2. Home appliance control boards. Air conditioners, rice cookers, induction cookers, microwave ovens and washing machines carry connector pins, eyelets and terminals alongside their radial and odd-form parts. Appliance lines are high-volume, multi-SKU DIP assembly — exactly where an uncorrected head position turns into rework every shift.

3. Power supply and ballast PCBA. Vehicle power supplies, energy-saving power supplies and electronic ballasts use terminals and eyelets in the mains-side section, where insertion depth and clinch quality are reliability characteristics, not cosmetics.

4. LED lighting and driver electronics. Lighting, display and control boards use eyelets and terminals in volume; consistent insertion protects the board from hole damage during subsequent soldering.

5. EMS and ODM plants running mixed odd-form assembly. When a plant inserts terminals, PINs and eyelets across many board variants, head position is re-verified at each changeover. A documented correction procedure is what keeps a mixed-model line inside its first-pass-yield target without an engineer tied to the machine.

How it fits into a complete PCB assembly line

Head positioning is a line-availability topic, even though it is executed on one machine. It sits inside the THT insertion block of a complete line:

SMT side first. Solder paste printing, SPI, pick-and-place and reflow build the SMD side of the board — Southern Machinery's SMT range covers this stage, including the SP-300/SP-1200 printers and the S-530L semi-automatic pick and place for LED and lens mounting.
Component preparation. Radial taping and lead-forming machines, capacitor lead cut-and-form equipment and IC forming machines convert bulk parts into insertion-ready format. Un-corrected head position cannot compensate for badly formed leads — the two have to be right together.
THT insertion block. This is where the S7020 Series sits, alongside the S-3010B and S-3000 radial inserters, the S-70LD and S7900 odd-form inserters and the S-7000/S-7020 PIN and eyelet families. Radial, axial, odd-form and terminal insertion stations all depend on the head being where the program thinks it is.
Soldering and lead finishing. Inserted boards move into lead-free wave soldering — the S-WS450 or the PC-controlled dual-wave S-WS350B — then to the S-320AT inline auto lead cutter, cleaning, and inspection (AVI/AOI such as the S-D330 online wave-solder appearance checker).
Board handling. Magazine loaders and unloaders (SLD/SUL series), bridge and inspection conveyors, PCB turnover machines and reject conveyors move the board between stages. Board handling determines how much time you actually have to make a head correction — a line that can be buffered is a line that can be corrected without shutting the whole plant down.
Support ecosystem. Spare parts, custom nozzles and tooling, repair, retrofit and training. Southern Machinery's maintenance documentation and machine-operation manuals are part of the deliverable, not an afterthought — the S7020T training chapters (start-up inspection, parameter settings, shutdown, and head position correction) exist so the correction can be repeated by your own team.

The line-level point is simple: one mis-positioned head does not cost you the output of one machine. It feeds defects into wave soldering, lead cutting, AOI and functional test, where each defect is far more expensive to remove.

Key selection parameters

If you are evaluating a PIN / eyelet / terminal insertion machine — or specifying the head-correction procedures that will keep it running — confirm the following. The S7020 Series figures below are the documented specification for that platform and should be treated as reference, not as a substitute for a configuration quotation for your own terminal list.

| Parameter | Documented S7020 Series specification | What to confirm for your build |

|---|---|---|

| Insertion heads | 2 insertion heads (documented) | Head count and configuration for your throughput target |

| Speed class | 12,000 CPH (documented) | Required rate against your terminal mix and changeover frequency |

| Terminal / component | PIN, eyelet, terminal; bulk or reel package; terminal thickness 0.5–1.2 mm | Your exact terminal part numbers, body size and lead form |

| PCB working area | 380 mm × 280 mm, enlarged sizes customizable | Your maximum and minimum board outline |

| Insertion geometry | Insertion angle 360° in 1° increments; vertical error ≤0.8°; motion accuracy 0.001 mm/pulse | Hole-to-lead clearance and positional tolerance for your design |

| PCB hole requirement | Hole 0.5 ± 0.1 mm larger than the component lead | Your board's drill chart and plating tolerance |

| Component spacing | Distance between components ≥ 2 mm | Your board density and keep-out rules |

| Clinch | Inward or outward clinching | The clinch style your solder process and IPC class expect |

| Feeding | Vibration bowl feeder or reel feeder | Terminal packaging format and presentation reliability |

| Programming | Online visual programming, visual correction, EXCEL; USB import or manual entry | Who programs, and whether programs move between machines |

| Utilities | Single 220 V AC, 50/60 Hz, 2 kVA | Site power and stability requirements |

| Footprint / weight | 1700 × 1300 × 1600 mm; 1200 kg (2-head configuration) | Floor loading, access for head service and CTA maintenance |

For the head correction itself, confirm what you are buying with the machine, not only what the machine does:

Procedure documentation. Does the supplier provide a written head-position procedure — casting height, centering, jaw guide gap, insert height, CTA alignment — with gauge/tooling requirements, or only verbal handover?
Setup tooling. Is the setup tool used for CTA-to-head alignment included, and are the gauge references documented for your configuration?
Training depth. Will your maintenance team be trained to perform the correction themselves, or does every adjustment require a service visit?
Spare-part coverage for head components. Jaw guides, springs, pusher tips, rollers and tooling pins are wear items. Confirm availability and lead time before you need them.
Verification criteria. What acceptance check is used after a correction — insert a sample board, inspect clinch, measure lead protrusion? The correction is only complete when it is verified.

ROI and quality perspective

From a buyer's perspective, head-position discipline is one of the cheapest levers on a THT line, because it is entirely inside your control once the machine and its procedures are in place:

Defect cost is asymmetrical. A bent terminal caught at the insertion station costs a re-insert. The same defect caught after wave soldering costs desoldering, hole cleaning, re-insertion and re-soldering — often with an operator damaging the hole in the process. Position accuracy upstream protects the most expensive inspection points downstream.
Rework on terminals is especially costly. Eyelets and terminals are mechanical joints. Poorly clinched or mis-inserted parts cannot simply be re-flowed; they have to be physically removed. Every avoided rework event is worth several times an avoided SMT rework event.
Downtime is the real cost of a drifting head. The machine keeps running and keeps producing marginal boards; the discovery usually happens at AOI or test, when the whole shift's output is suspect. A scheduled position check turns that into a bounded, planned task.
Tooling life and spare-part spend. A head that is out of alignment loads its jaw guides, rollers and anvils unevenly. Correct positioning extends wear-part life and reduces the spare-parts line on the P&L.
Training replaces dependency. If the correction procedure is documented and your team is trained, head adjustment stops being a service call and becomes routine maintenance. That is what makes a terminal insertion line genuinely productive rather than merely automated.
First-pass yield compounds. A correctly positioned head, correctly formed leads and a properly specified clinch are what let a board clear wave soldering, lead cutting and AOI without manual intervention — the practical definition of a stable THT line.

Model it with your own numbers: how many terminal insertions per shift, what your current mis-insert rate is, what rework on a terminal costs you, and how many hours per month are lost to position-related stoppages. For most plants the arithmetic favours a documented correction routine long before it favours another machine.

FAQ

What does "correcting the machine's head insertion position" mean?

It means restoring the alignment between the insertion head, the CTA (component transfer assembly) that feeds it, and the board position at the X/Y table. In practice it is a set of related adjustments — head casting height, head centering, jaw guide gap, insert height and CTA-to-head alignment — plus verification that a sample terminal inserts and clinches correctly.

What are the symptoms of an insertion head that is out of position?

Terminals tipped or leaning in the hole, bent leads, inconsistent lead protrusion under the board, off-centre clinching, jaw guide "wandering" during insertion, the head interfering with components already placed on the workboard, and a rising mis-insert rate that appears without any program change.

How often should the insertion head position be checked?

After every insertion-head removal or service, after any crash or jam, after a tooling or product changeover, and on a defined preventive-maintenance interval based on your production hours. Southern Machinery's maintenance documentation and the S7020T training chapters define the sequence so the check is repeatable rather than improvised.

Can an operator perform the head position correction, or does it need an engineer?

With a written procedure, the right setup tooling and training, a trained maintenance technician or senior operator can perform it. The critical requirements are the documented adjustment sequence and a verification step — not a specific job title. Southern Machinery provides machine operation manuals and operator training for exactly this reason.

Does head position affect clinch quality?

Yes. Clinching happens under the board after insertion, so the terminal has to arrive square and at the correct depth for the anvil to form it consistently. If the head is off position or the insert height is wrong, the clinch will be off-centre or the lead protrusion inconsistent, which affects solderability and long-term joint reliability.

Which Southern Machinery machines use this type of head correction?

The S7020 Series PIN / eyelet / terminal insertion machine — including the S7020T terminal-insertion configuration shown in this training chapter — plus the S-7000 family of PIN, eyelet and odd-form inserters. Radial and axial inserters (S-3010B, S-3000, S-4000) use equivalent head-position and alignment procedures adapted to their head design.

Is the training video enough to perform the correction unaided?

Use it as the introduction and the visual reference, then work from the written procedure for your exact configuration, since gauge values, tooling and adjustment order are configuration-specific. Southern Machinery supplies the documentation with the machine and can train your team on site or remotely.

Contact Southern Machinery

Southern Machinery (Shenzhen, China; established 2011; 237+ global customers) designs and manufactures SMT, THT and PCB assembly automation — insertion machines, wave soldering, board handling, cleaning, inspection and the spare parts, training and retrofit services around them.

For help with an insertion head position correction, an S7020 Series terminal insertion configuration, or the full THT insertion block of your line, contact the team:

Email: [jasonwu@smthelp.com](mailto:jasonwu@smthelp.com)
Website: www.smthelp.com
Catalogs, manuals & documents: file.autoinsertion.com
Product images: ph.smthelp.com
Machine operation manuals & training: SMT/THT machine operation manual library on smthelp.com