Paper on Roll Grinding and Measuring
The following paper was given by Juhani Jaske in São Paulo, Brazil October 18, 2007:
ABTCP-ZELLCHEMING 2007 40th Pulp and Paper International Congress
AXIAL AND CIRCUMFERENTIAL ROLL MEASUREMENT – ONE KEY TO PROPER ROLL MAINTENANCE
E. Juhani Jaske, FMT Equipment Corporation, Hamden, CT, USA
Dominic A. D’Amato, Engineering Consultant, Cheshire, CT, USA
ABSTRACT: This paper describes a roll measurement system designed to measure the axial and circumferential surface profiles of rolls used in paper machines and metals rolling mills. It includes a brief description of roll grinding problems, measuring techniques, data analysis and mathematical procedures. This new, low cost system is unique in that it measures and mathematically separates: Roll Motion, Eccentricity (Run-out), and Roundness The paper also presents sample measurement results to confirm this system’s technical approach. Note that even though the information in this technical paper has been published a while ago, some competitors still make incorrect claims that, e.g., Roundness cannot be measured using a two-probe measuring principle. This paper explains how it is done with one probe if there is no motion in a work piece (roll), and with two probes if there is motion present, e.g., from bearings. Those who claim otherwise either mislead customers on purpose or just simply do not know better.
Click here for a copy of the paper.
Paper on Roll Grinding and Measuring
November 4, 2015The following paper was given by Juhani Jaske in São Paulo, Brazil October 18, 2007:
ABTCP-ZELLCHEMING 2007 40th Pulp and Paper International Congress
AXIAL AND CIRCUMFERENTIAL ROLL MEASUREMENT – ONE KEY TO PROPER ROLL MAINTENANCE
E. Juhani Jaske, FMT Equipment Corporation, Hamden, CT, USA
Dominic A. D’Amato, Engineering Consultant, Cheshire, CT, USA
ABSTRACT: This paper describes a roll measurement system designed to measure the axial and circumferential surface profiles of rolls used in paper machines and metals rolling mills. It includes a brief description of roll grinding problems, measuring techniques, data analysis and mathematical procedures. This new, low cost system is unique in that it measures and mathematically separates: Roll Motion, Eccentricity (Run-out), and Roundness The paper also presents sample measurement results to confirm this system’s technical approach. Note that even though the information in this technical paper has been published a while ago, some competitors still make incorrect claims that, e.g., Roundness cannot be measured using a two-probe measuring principle. This paper explains how it is done with one probe if there is no motion in a work piece (roll), and with two probes if there is motion present, e.g., from bearings. Those who claim otherwise either mislead customers on purpose or just simply do not know better.
Click here for a copy of the paper.
Paper on Trisecting an Angle
October 21, 2016Dom D’Amato, a good, long time friend of mine, wrote a thesis after being challenged by “unsolvable” comments in Wikipedia and other publications about Squaring the Circle using only a straight edge and a compass. He “began a journey toward the exact solutions to four 2500-year-old Greek graphical puzzles:” Trisecting an Angle, Constructing a Nonagon, Squaring the Circle, and Doubling the Cube. Solving trisecting an angle was the key in solving three other drafting puzzles, too!
Click here for a copy of the paper.
Note that Dom has used similar principles in developing the algorithms for many RollTrack® measuring software features such as separating roll motion, eccentricity (run-out) and roundness using two probes on a rotating, cylindrical roll.
Juhani Jaske