Medals, coins, badges and buttons are printed on the same flatbed as a signage panel, and they fail for a different reason. A large panel forgives a placement offset of a millimetre or two; a coin of a few centimetres does not. On small parts, positioning is not a finishing detail, it is the limit that decides whether the job is profitable.

This guide covers the two positioning routes published for this range, controlled fixtures and the optional wide-beam CCD camera, and works through what each one needs: how part geometry is mapped before artwork, how a tray carries many designs, what to test before a small-part order is released, how to estimate output honestly, and what to do with parts that fail.

Why does positioning decide small-part yield?

Because a small part leaves little room for error.

On a blank of a few centimetres, a placement offset invisible on a large panel pushes the artwork off the face or onto a rim, so positioning is the first production limit.

The published qualification route for medals, coins and buttons names the blank as the first thing to freeze: supplier, product code, material description, coating, dimensions, face profile and production lot, all recorded before sample work begins. That list is a positioning list. A blank whose diameter, rim or face profile varies between lots cannot be held in a fixed position, and a job that cannot be positioned cannot be inspected against an approved sample.

The second published point is that platform size proves nothing on its own. Raised rims, recessed faces, domed parts, holes, assembled hardware, surface condition, fixture height and inspection requirements can each change the result, and the published guidance is to test the exact blank and record the approved setup. A small part that fits the bed easily can still fail on the geometry of its own face.

What can a fixture do that free loading cannot?

A fixture repeats a position.

Pockets, datum edges and part clearance hold every blank in the same place across a batch, which is what turns a good sample into a repeatable result and allows the printed position to be inspected.

The published positioning route for small flat parts asks for the fixture drawing or sample tray, the pocket pitch, the part orientation, the datum and the loading pattern, and it asks for all of them to be approved before the job runs. Each element answers a specific failure. The pocket controls the position; the pitch controls the spacing and the number of parts per load; the datum gives the machine a fixed origin; the orientation keeps the artwork on the correct face; and the loading pattern decides how many units are produced between stops.

A fixture also makes the job inspectable. Where every part sits in the same place, a deviation is a defect rather than normal variation, and the published acceptance check for a small-part batch is placement against an approved sample. Without a fixture, the placement moves between units and the inspection has no stable reference to compare against.

When does the optional CCD camera help?

When a fixed fixture cannot hold the part reliably.

The published wide-beam CCD option can assist positioning on suitable pre-cut components, and it is reviewed against the real tray layout rather than assumed to replace a well-made fixture.

The AJ1206 compact platform is published with an optional wide-beam CCD scan camera alongside its CMYK plus white plus varnish configuration, and the published route treats the decision between fixture and vision as a real choice rather than a hierarchy. The question is not which is more advanced but which suits the part. A rigid blank with a stable outline and a high tray count is usually a fixture job. A pre-cut component whose outline varies, or a run with many artwork versions where repositioning by pocket cannot keep up, is where the vision route earns its place.

Both routes depend on the same upstream decision. The published guidance is to define whether the optional vision route is part of the reviewed setup before sample work begins, because a process that is half fixture and half vision has neither the repeatability of a pocket nor the flexibility of a scan.

How should part geometry be mapped before artwork?

Measure the blank before writing the artwork.

The published qualification route freezes the blank SKU, coating, dimensions and face profile first, then maps the printable face and the clearance before any artwork is approved.

The sequence matters because the artwork is built to the printable face, not to the outline of the part. A raised rim reduces the usable face, a recess changes the head clearance, a domed centre changes the focus condition, and a hole or an assembled fitting creates a no-print zone. The published artwork guidance for this range asks for cutouts, openings, fasteners, vents and raised rims to be treated as controlled no-print zones taken from the current drawing, and for orientation and datum to be confirmed on the real part.

Two consequences follow. First, the printable face should be measured on representative blanks from more than one lot, because a face profile that varies between lots is a positioning problem waiting to appear mid-batch. Second, the no-print zones belong in the artwork file rather than in the operator’s judgement, so that a repeat order produces an identical result. The revised file system is described in the companion guide to preparing artwork files for UV printing.

How do you control many designs on one tray?

From a position-to-file matrix.

Map each loaded pocket or detected part to the correct artwork, colour reference and order identifier, so a tray can carry many designs without a restarted setup and every unit stays traceable.

The published small-part workflow asks for a file matrix, a quantity by design, a loading sequence and an inspection reference for every version, and for each loaded position to be connected to the correct artwork and customer order identifier. That is the same discipline that makes a mixed schedule work, applied at the scale of a single tray. Where a tray carries a dozen designs, the tray rather than the machine becomes the unit of control.

The traceability element is not optional. The published guidance for personalised work states that the current file source, part mapping, verification and traceability process must be reviewed before production. On a medal or a button, the printed identity may carry a name, a date or a serial, and the connection between that printed identity and the order it belongs to has to be recorded rather than reconstructed.

What should be tested before a small-part order is released?

The real blank, loaded, in a timed batch.

Approve placement, colour, opacity, varnish location, surface condition and handling checks on the real blank, then run a timed representative batch and retain the sample with its process record.

The test that matters is a representative batch rather than a single perfect sample, because placement, colour and adhesion can all vary across the tray and across the run. The published guidance for compact flat parts asks for representative parts to be printed across the intended bed positions and for the loading and printing cycle to be repeated, since a batch reveals variation that one sample hides.

How do you estimate realistic small-part output?

By timing the whole batch, not the print.

Finished output depends on blank inspection, tray loading, positioning, artwork changes, curing, unloading, inspection and changeovers, so a headline hourly figure is not a capacity plan.

The published coin figure for this range, up to 2,000 coins per hour, is explicitly described as belonging to one specific coin workflow rather than to the platform in general, and the published guidance is to time the complete representative batch before making capacity or delivery commitments. That instruction is the honest version of the capacity question, because the print is rarely the slowest part of a small-part job. Loading a tray by hand, checking blanks and inspecting finished parts often take longer than the pass itself.

The practical method is to time a real batch from the first blank inspection to the last inspected piece, including one changeover, and then divide the usable shift time by that figure. A capacity estimate built from the pass time alone will overstate what the shop can ship, which is exactly the gap that turns a profitable line into a late one.

What happens to rejected and reworked parts?

Inspect, mark and re-enter them deliberately.

Reworked and re-inspected parts should be distinguishable from first-pass parts, with the defect, cause and disposition recorded, so an intermittent fault becomes a pattern.

Small parts are cheap individually and expensive in aggregate, which is why a rejection decision made casually in the tray is a real cost. The published process record for this range keeps the inspection result alongside the artwork version, the settings and the environment, which is what allows a placement or adhesion fault to be traced to a cause. On a small-part job the likely causes are few and specific: a worn pocket, a blank from a different lot, a face profile that has moved, or a curing or adhesion condition that changed with the room.

The commercial case for recording disposition is straightforward. Where reworked and scrapped parts are separated in the record, the reject rate is a number the shop can act on; where they are mixed together in the tray, the rate is invisible until a customer complains. For a repeat job, the record is the only thing that shows whether the process improved.

What the decision comes down to

Small-part UV printing is a positioning problem before it is a printing problem. Freeze the blank, map the printable face, choose between a controlled fixture and the reviewed optional vision route, and connect every tray position to the artwork and order it belongs to.

Then test on the real part and time the whole batch rather than the pass. The published qualification route for medals, coins and buttons sits with the medals and buttons collection and the AJ1206 compact platform page, the same discipline for rigid parts is described in the industrial nameplate collection, and the controlled no-print-zone and datum requirements are described in the industrial panel guide.

The supporting references for a qualified process sit outside the catalogue: colour management guidance from the International Color Consortium, process standards from Fogra and PRINTING United Alliance, adhesion testing under ASTM D3359, occupational exposure guidance from HSE printing, and export requirements summarised by trade.gov.