What Products Are Suitable for the Flash VX3000 Tester

• 1
  How the Flash VX3000 tester reads a part
• 2
  Geometry that suits a Flash VX3000 tester products list
• 3
  Materials and surface finishes that change the result
• 4
  Where optical measurement stops working
• 5
  Which parts fit a Flash VX3000 tester products plan

The instrument projects light through a telecentric lens and captures the shadow of the part on a sensor. Because the lens keeps magnification constant across depth, the outline stays true even when the part sits slightly off the focal plane. That is why Flash VX3000 tester products with clean, through-cut edges measure accurately with almost no fixturing.

A ceramic or glass stage holds the part flat. The software finds edges by contrast, converts pixels to millimeters, and fits circles, lines or arcs to the detected points. No probe touches the surface, so soft or polished parts are not scratched and thin foils do not deflect under contact force.

The trade-off is that the system only sees what it can silhouette. A slot narrower than a few tenths of a millimeter, a re-entrant undercut, or an internal bore blocks the light path and cannot be measured in transmission. Those features need a different method, and we will cover that boundary later in this article.

For a typical milled aluminium bracket, the operator can measure overall length, hole pitch and edge-to-hole distance in one pass, often in under a minute. That speed is the main reason vision measurement is used for first-article checks and in-process sampling rather than for a single critical dimension.

Flat parts give the best results. Stamped brackets, shims, gaskets, lead frames and etched plates lie flat on the stage with minimal support. Their edges are usually parallel to the optical axis, so the shadow boundary is sharp and repeatable across the whole field of view.

Parts with a consistent thickness and a low aspect ratio also work well. A 2 mm thick plate with 80 mm length sits stable; a 200 mm long bar of the same thickness can bow and shift the edge, so it needs supports or a different measurement approach.

Turned and milled parts can qualify if the measured features lie on the top face or on edges visible from above. A bearing housing with a top boss, a bolt circle and a counterbore edge is a good candidate. Deep side walls and vertical surfaces that face away from the lens are not.

Avoid parts whose critical feature is hidden from view. A cross-drilled shaft measured only from above gives you hole position in X and Y but not in Z. Be honest about which dimensions the optical path can actually see before you commit the part to this method.

Opaque materials with a matte or satin finish are ideal. Anodized aluminium, black oxide steel and bead-blasted stainless absorb stray light and produce strong edge contrast. Titanium and Inconel behave the same way once the surface is not mirror-polished.

Shiny surfaces are the common failure mode. A mirror-polished stainless steel or hard-chromed part reflects the backlight and can create a bright halo near the edge, which the software may read as part of the silhouette. Diffuse lighting or a matte coating fixes most of these cases, but the measurement plan must account for it.

Translucent and transparent materials are a poor fit for transmission mode. Acrylic, polycarbonate and clear PMMA let light pass through, so the shadow is weak. Colored or filled plastics, such as black POM or glass-filled PA, behave much more like metals and can be measured normally.

Soft materials are a strength of this method. Silicone gaskets, rubber seals and thin copper foils deform under a contact probe, but they stay flat on the stage and keep their true shape. That is a real advantage when the drawing tolerance is tight and the material is compliant.

The first hard limit is the light path. If a feature does not interrupt the beam between the part and the sensor, the system cannot see it. Internal threads, blind holes, undercuts and side-wall features are invisible in transmission. They need a touch probe, a laser line scanner or a CT scan.

The second limit is depth of field. A part that is not flat will have features at different heights, and only one plane is in sharp focus at a time. The telecentric lens reduces the error from defocus, but it does not remove it. A 5 mm step over a 50 mm part can shift the apparent edge by a few micrometers.

The third limit is edge quality. A burr, a rolled edge or a chamfer changes the silhouette in a way that no software can reverse. For parts where edge condition is the measured feature, prepare the edge first or use a method that reads the surface rather than the shadow.

Finally, remember that a Flash VX3000 tester products list is only as good as the fixturing. A part that rocks, tilts or slides between measurements gives repeatable-looking numbers that are simply wrong. Flatness of the stage and a light hold-down are part of the measurement, not an afterthought.