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Cutting edge motion control solutions for science & technology applications

29 May 2018

LG Motion works closely with the National Physics Laboratory on a number of diverse projects where very often customised motion control solutions are required.

Typical rotary table design from LG Motion

Recently the NPL approached LG Motion with a requirement for an upgrade to the National Reference Reflectometer (NRR). There is an internationally agreed method for describing colour which mathematically combines the spectral reflectance, transmittance or emission data for the material or light source with the spectral visual efficiency of the human eye.

The NPL measures reflected colour using a calibrated spectrophotometer which compares the results with an NPL master white standard calibrated on the National Reference Reflectometer (NRR).

Rotary table application

The spectrophotometer evaluates the spectral reflectance of the measured surface, a process which is controlled by a motorised table designed and supplied by LG Motion.

The rotary table has 360° rotation capability and a stepper motor and the assembly is fitted with an incremental angle encoder, mounted on the moving top. A display for encoder readout from Heidenhain completes the system.

Rotary stage features

The rotary table delivers precise positioning via a 90:1 ratio worm wheel. A central aperture of 110mm allows for services and other connections to be made through the centre of the table giving added flexibility when designing experiments or processing with external services.

• Usable travel - 360°
• Positional repeatability - <0,02°
• Maximum load - 500kg, centrally mounted
• Rotary encoder - Type: ERO 785 – Inc’ 36000ppr / min.
• Home datum sensor - PNP normally open
Motors - Stepper

One-stop shop for motion control with global partners

LG Motion rotary and linear stages can be combined with servo and stepper drives and motion control components and systems supplied by a number of key global partners including Polaris, Steinmeyer, Baumeister & Schack, Empire Magnetics, Arcus, Schneeberger and Heidenhain.

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