Test & measurement
during the early development stages of this project,” Lei explains. The RESOLUTE RESA system delivers class-leading performance
and features an absolute ring with a fine 30 µm-pitch scale, SDE of just ±40 nm and jitter of less than 10 nm RMS. Two types of RESA ring are available, each with a different method of
installation. One variant features Renishaw's patented taper mount design, which reduces demand for tightly-tolerance machined components and eliminates eccentricity; and the other features a low- profile ring design that offers reduced rotational inertia. Renishaw's non-contact optical encoders eliminate backlash, shaft
wind-up (torsion) and other mechanical hysteresis errors that are inherent in traditional enclosed encoders. RESOLUTE encoders also feature a wide range of industry standard
serial comms protocols to enable direct communications with the customer's controller and provide real-time position data. Lei continues: “In terms of compatibility and the diversity of the product
range — there are definite advantages to Renishaw encoders. Many controller manufacturers out there offer a huge variety of available communications protocols: RESOLUTE absolute optical encoders support most mainstream industrial comms protocols including FANUC, Mitsubishi, Siemens DRIVE-CLiQ and BiSS. Furthermore, the encoder readhead and ring dimensions are always the same irrespective of the serial protocol output option which eliminates the need to modify our structural designs.” Haozhi has also developed linear motors, using Renishaw's traditional
RG2 and RG4 encoder ranges, that are fully capable of meeting the needs of demanding industries including computers, communications and consumer electronics (3C). Lei highlights the role of Renishaw laser calibration products in the
quality control testing of Haozhi's linear and rotary stages: “In order to make a good job of quality control, we use Renishaw XL-80 laser interferometers with XR20-W rotary axis calibrators to test all our linear motors and rotary tables. The accuracy, ease of use and reliability of the testing equipment were decisive factors.”
INS-APR20-NOVATRON.qxp_Layout 1 14/04/2020 10:18 Page 1
Results By integrating Renishaw's RESOLUTE absolute optical encoder system into its CNC rotary tables, Haozhi has further assured the accuracy, reliability and superior motion control performance of its products. Haozhi rotary tables offer positioning accuracy of ±10 arc seconds,
repeatable precision of ±2 arc seconds and a wide range of torques and speeds. While Haozhi linear motors offer a bidirectional positioning accuracy of ±2 µm, a continuous thrust range of 0.2–4.0 kN, and a peak thrust range of 1–12 kN. RESOLUTE encoders also feature a high level of ingress protection which
has enabled Haozhi to build rotary tables with an IP68 rating in some cases. Renishaw's long-term partnership with Haozhi has promoted a more
integrated product development strategy that helps the company to maintain its position at the cutting edge of DD motor technology.
Renishaw
www.renishaw.com
Precision humidity measuring technology
Humidity or dewpoint within high VOC environments Novasina Quantadat humidity transmitter
Supplied with UKAS ISO 17025 calibration at 3 points Accuracy +/- 0.5 % Rh
High resilience against Volatile Organic Compounds
Simple calibration against UKAS traceable humidity salt capsules Easy intuitive menu Fast sensor response
Process control Warehouses Packaging Pharmaceuticals Greenhouses Cheese ripening (high ammonia env)
Novatron House, 46 London Rd, Horsham, West Sussex. RH12 1AY.
Sales@novatron.co.uk www.novatron.co.uk t 01403 754416
UKAS accredited humidity laboratory 0669
Instrumentation Monthly January 2021
53
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