correct as the log is being turned. USNR is also developing a turn detector using image processing technology to measure the final turn accuracy of the log as it enters the cutting tools. The turn detector can report the accuracy on every log, as well as a running average and end- of shift-reports. “As these tools become available the typical
accuracy for a log turner is becoming more widely understood. USNR’s PGLR system is unique in that diagnostics show plots of the turn measurements throughout the turn and reports on-going turn accuracy over the previous 1,000 logs.”
Eye-opening results USNR’s experience with testing turn error/accuracy has yielded eye-opening results. The cutting devices on any log breakdown system are set assuming an almost perfect turn in the log turner. However, in practical terms the turn is seldom perfect, resulting in lost recovery. Testing has shown that by rescanning to determine the exact position of the log, and the ability to reset the cutting tools accordingly, results in significant improvement in recovery. Turn error can typically improve from an
average absolute turn error of over 8° to an average absolute turn error of less than 4° with turn correction. This can yield recovery improvements from 91-96%. Many variables come into play when measuring turn accuracy; with larger logs high turn accuracy is typically much easier to achieve.
Final acceptance tests for the PGLR systems on both the large log line and the VSS line, achieved standard deviations a great deal better than promised and required by contract. USNR was recently awarded patents covering the concept.
Controls, Scanning & Optimisation
MPM Engineering is a global supplier of Controls, Scanning and Optimization Systems for the wood processing industry including:
● Log merchandising ● Log sorting ● Auto-rotation ● Primary breakdown ● Curve Sawing ● Cant Optimisation
● Edger and trimmer ● HMI systems ● PLC Control Systems ● SCADA systems ● Lumber sorter systems
Panel Fabrication Shop
Our 5000 sq ft panel fabrication shop is fully equipped to provide the
following services: ● Engineering, Drawings and Documentation
● PLC programming ● Operator cab design, wiring and testing
● Operator Console design, wiring and testing
● Control Panel assembly and testing
● MCC assembly and testing ● VFD panel assembly and testing ● Machine wiring ● Various Container mounted machinery wiring
We have experience with all major brands of PLCs.
The USNR quad roll log turner with PGLR system installed
Unique large log line Bill Kordyban, son of Carrier’s founder, serves as President and General Manager for the company’s operations. In 2009, he decided a new large log line for Tabor was the next step in modernising the breakdown process, and again selected USNR to supply the equipment. The
FEBRUARY/MARCH 2012 | IFI 23
The shop has 3 phase power available to facilitate testing of MCCs and VFDs, is CSA and UL certified and currently certified for systems up to a 2000 Amp service at 600 volts.
For further information contact us at:
MPM Engineering Ltd. #200 – 5465 – 192 Street, Surrey, BC V3S 8E5, Canada Tel: (604) 574 – 1397 Fax: (604) 574-0627 email:
mpm@mpmeng.com
www.mpmeng.com
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