Terminal crimping machine sample approval should answer a specific purchasing question: can the proposed machine, applicator and preparation method repeatedly make the required termination from your actual materials, under controlled and safe conditions? A polished demonstration using the supplier’s easiest wire does not answer that question. Neither does a single pull-test result without its sample identity, method and acceptance document.
Start with the termination drawing, not a nominal machine capacity. The same conductor area can hide different strand construction, insulation diameter or terminal geometry. These differences can affect feeding, positioning and crimp formation. A sample program should expose those dependencies before the purchase order freezes tooling, accessories and acceptance obligations.
Use the following gates to build a trial that procurement can price, engineering can interpret and quality can release. The suggested records are planning tools, not universal test requirements or numerical acceptance limits.
Contents: Define the combination, Authorize a safe trial, Allocate the samples, Measure against documents, Decide approval scope, Prepare the purchase handover.
Define the combination
Write one configuration record for each wire-terminal-applicator combination. Include wire manufacturer, part number, conductor material and plating, cross-sectional designation, strand construction, insulation material and outside diameter. Identify terminal part number, revision, material, plating, barrel style and delivery format. Record the material lots used in the trial; photographs alone cannot establish identity.
Next identify the machine model and serial number, applicator or die part number and revision, feed direction, crimper and anvil identities, locator and relevant software or recipe revision. Confirm the physical interface and required utilities against supplier documentation. Do not assume an electric bench tool accepts a reel-fed applicator merely because both are called crimping equipment.
TONFUL’s terminal crimping machine category is a starting point for a configuration enquiry, not evidence that every listed machine accepts every terminal family. Ask for written confirmation of the proposed combination. Use the broader electrical tools range to separate cutting and stripping equipment from the crimping station itself.
Freeze preparation and scope
Record the approved strip length and tolerance source, stripping method, conductor handling and permitted material preparation. If a wire preparation step damages strands, a machine comparison can mistakenly blame the press. Inspect preparation before allowing coupons into the trial and keep rejected preparation samples separate from crimp defects.
Select representative combinations based on actual purchase scope and risk. A difficult feed geometry, a delicate insulation system and a different terminal reel may deserve separate trials. Boundary sizes are useful only when they represent documented intended combinations; they do not qualify every intermediate terminal automatically. Mark untested combinations as not evaluated rather than extending approval by assumption.
Authorize a safe trial
Have the responsible safety and engineering personnel approve the trial method before operation. They should review guarding, interlocks, emergency stopping, restart behavior, operator access, pinch points, material loading and foreseeable clearing tasks against the equipment instructions and applicable site requirements. This article does not prescribe a bypass or a method for testing safety functions.
Only trained, authorized personnel should run the demonstration. Define who supervises, who may change settings, who stops the trial and who controls access. Verify the electrical or pneumatic supply requirements using machine documentation. Keep the work area clear and provide stable support for wire stock so handling does not pull an operator toward the tooling.
Before die, blade or applicator access, follow the manufacturer’s isolation and stored-energy procedure. Removing a power plug alone may not address pneumatic pressure or other retained energy. Do not reach into a guarded area to recover a coupon during a cycle. A trial that depends on defeated protection cannot be accepted because its crimps look satisfactory.
Demonstrate routine interruptions
Include approved checks after start-up, material replenishment, applicator change, recipe change and a planned restart when these events are relevant. Record the actual settings and samples associated with each event. Make no performance inference from an uninterrupted demonstration that excludes the changes operators will perform in production.
Ask the supplier to demonstrate permitted adjustment and recovery tasks using the documented method. Record training needs and maintenance access limitations. Unresolved guarding, interlock or safe-access concerns stop the purchase approval gate independently of product measurements. Procurement should not exchange those issues for a price reduction or a promise to train later.
Allocate the samples
Agree sample quantities before the trial. Engineering and quality should choose them from the governing qualification plan, customer obligations, configuration risks and intended statistical conclusions. There is no universal sample count that proves machine capability. A small demonstration may establish feasibility while leaving production capability unproven.
Allocate separate specimens where a test changes or destroys the joint. Retain identity through every transfer and label the order of operations. A pulled terminal cannot subsequently supply an undisturbed cross-section. If the approved method permits dimensional inspection before a destructive test, record that sequence rather than treating all observations as independent samples.
| Allocation | Quantity authority | Identity and handling | Purpose |
|---|---|---|---|
| Visual and dimensions | Approved trial plan | Configuration, lot, sequence and settings | Check formation and documented dimensions |
| Mechanical tests | Customer or application specification | Dedicated traceable coupons | Evaluate retention using specified method |
| Cross-section | Engineering qualification plan | Separate undamaged joints and section location | Investigate internal formation where required |
| Electrical or aged tests | Applicable product qualification plan | Dedicated specimens and conditioning history | Assess specified electrical or environmental behavior |
| Retained references | Buyer-supplier agreement | Sealed and indexed reference set | Support later comparison, not replace criteria |
Provide reserve material for documented invalid tests and investigation. Reserve specimens are not permission to keep testing until a passing subset appears. Define invalid-test reasons, authorization and replacement rules in advance. Preserve failures, settings and investigation notes; do not silently remove them from the reported population.
Measure against documents
Make an acceptance-source register before testing. For each characteristic, identify the controlling drawing, application specification or customer-approved plan, revision, clause, limit and approver. Resolve conflicting documents before the trial. A supplier’s usual limit does not automatically supersede a customer requirement.
For example, TE Connectivity’s crimp quality guidelines direct users to the relevant application specification for contact-specific crimp-height tolerances. That principle supports using the correct product document rather than copying an example tolerance into an unrelated trial. The guidelines are not approval evidence for a TONFUL configuration.
Match the method to the characteristic
For visual review, examine the features that apply to the terminal design: conductor position, insulation position, barrel formation, strand containment, feed damage and mating-feature condition. Not every feature of an open-barrel contact applies to a closed-barrel lug. Use design-specific illustrations and criteria rather than judging everything against one generic good-crimp picture.
For dimensional measurements, record the instrument, calibration status, suitable range and accuracy, contact geometry, measurement location and method. Establish repeatability or measurement-system evidence appropriate to the decision. A display with more decimal places is not proof that the measurement can distinguish the allowed tolerance reliably.
For pull testing, specify pull speed, fixture, grip arrangement, equipment range and accuracy, conditioning and treatment of insulation support according to the approved method. Record peak force and failure location, including wire break, pull-out or fixture slip. A fixture problem is an invalid-test investigation, not an automatic product pass or failure.
Where resistance testing is required, use the approved low-resistance method on isolated specimens. Document test current, Force/Sense positions, reference wire length, ambient temperature, stabilization, offset compensation or forward/reverse measurements, and reference-wire resistance subtraction where applicable. Record both initial and aged change when the qualification plan calls for aging. Never measure resistance on energized assemblies.
For cross-sections, preserve raw images, preparation method, cut location, scale and specimen traceability. Evaluate against the applicable specification through an authorized reviewer. A conceptual illustration cannot establish void content, compression or metallurgical acceptance. Electrical and environmental tests are conditional product requirements, not mandatory additions to every machine feasibility demonstration.
Decide approval scope
Separate machine process approval from product qualification. Process approval addresses the controlled equipment configuration and its ability to execute the documented operation. Product approval concerns the termination’s required performance in its intended application. A successful guarded trial does not prove an environmental rating, and a qualified terminal does not validate an uncontrolled machine setup.
| Record field | Required entry before disposition |
|---|---|
| Configuration and specimen IDs | Wire, terminal, applicator, machine and material lots |
| Operation state | Start-up, steady operation, changeover or restart |
| Method and equipment | Procedure revision, instrument, fixture and calibration reference |
| Acceptance source | Document, revision, clause and authorized limits |
| Result | Raw measurement, units, failure mode and evidence reference |
| Disposition | Accepted, rejected, conditional or not evaluated |
| Authority | Engineering, quality, safety and customer approval where required |
| Restriction and closure | Scope boundary, action owner and verification evidence |
Do not call a process capable from a few selected samples. Capability claims require a suitable stable data set, an adequate measurement system and a defined statistical method. If those were outside the trial scope, state that explicitly. Preserve time order so variation after adjustment or restart is visible rather than averaged away.
Conditional acceptance should name the restricted use, outstanding issue, owner, closure evidence and authorization. Safety-critical unresolved issues remain stop conditions. When results fail, contain affected material, identify the causal hypothesis, authorize corrective changes and repeat the affected qualification scope. Keep both the original and revised evidence so reviewers can understand what changed.
Prepare the purchase handover
Attach the approved configuration and trial report to the commercial specification. Identify exactly which machine, tooling, guards, documentation, spare wear parts and training items the quotation includes. Require an agreed procedure for substitutions. A supplier may change a small tooling component without changing the machine name, yet invalidate the trial’s assumptions.
Define factory and receiving acceptance separately when both are needed. Receiving checks should reconcile delivered identities, shipping condition, documentation and the agreed demonstration scope. Keep site commissioning and local safety acceptance visible; a remote sample report cannot verify the installation at your facility. Agree how discrepancies are held and closed before production release.
For adjacent tooling, consult TONFUL’s crimping tools category and hydraulic tools category only where the actual termination and process require them. Do not treat a handheld hydraulic tool as a substitute for an approved machine applicator without a separate engineering review.
Send the actual wire and terminal specifications, applicator details, planned sample allocations and acceptance-source register through TONFUL’s technical enquiry page. Ask for a configuration-specific proposal and a documented trial plan before ordering. Keep unconfirmed capacity, compatibility and product qualification outside the purchase approval until supporting evidence is supplied.