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2-Axis Digital Position Readout (DRO) – BAUSCH & LOMB ACU-RITE IIA
The ACU-RITE IIA is a 2-axis digital position readout display (“Two-Axis Digital Readout Display”) manufactured by Bausch & Lomb under the ACU-RITE brand, documented as a position display unit for conventional machine tools (milling machines, lathes, surface grinders). The system acquires signals from optical or magnetic linear scales mounted on the machine axes and displays the position on 7-segment LED digit readouts. The unit supports display in both millimetres and inches and includes preset, incremental zero, and — in certain variants — bolt-hole circle calculator functions. The ACU-RITE Series II is available in several variants (including the IIA) differing in axis configuration and additional features.
The digital position readout is the device that allows the operator to know the precise position of the machine tool axes during manual machining. Without this unit the operator must rely solely on mechanical vernier dials and micrometers, dramatically reducing both accuracy and machining speed. A failure of the display or the acquisition circuitry makes it impossible to perform dimensionally accurate operations, increasing the risk of scrap parts and extending cycle time.
Bausch & Lomb is a historic American company founded in 1853, best known in the scientific and ophthalmic optics sector (lenses, microscopes, military telescopes). Its Scientific Instruments Division developed the ACU-RITE line of digital position readouts from the 1960s, becoming a benchmark for precision conventional machine tools. The division was divested and changed ownership several times before being acquired by Heidenhain in 1999. All products in the ACU-RITE IIA family are legacy / discontinued: available only as used, surplus, or through specialist repair services.
Main Technical Specifications
| Type | 2-axis digital position readout (DRO – Digital Readout) |
| Part number | ACU-RITE IIA (ACURITEIIA) |
| Brand | Bausch & Lomb – ACU-RITE (now Heidenhain, legacy) |
| Known application | Precision conventional milling machines, lathes, and surface grinders |
| Function | Digital display of X and Y axis positions; preset, incremental zero, mm / inch switching |
| Number of axes | 2 (X, Y) |
| Display | 7-segment LED digits, 6–7 digits per axis (typical) |
| Resolution | 0.001 mm / 0.0001 inch (typical for Series IIA) |
| Scale input | ACU-RITE optical or magnetic linear scales (TTL or sinusoidal 1 Vpp signal) |
| Power supply | 110 V AC or 220 V AC, 50–60 Hz (typical; selectable) |
| Interfaces / connectors | Multi-pin connectors for linear scales; power terminal strip |
| Weight | ~2.5–5 kg |
| Dimensions | ~280–380 mm × 150–220 mm × 100–160 mm |
| Production status | Legacy / discontinued — used / surplus / repair only |