Manual Roll Calliper Gauges

Accurate Measurement of Camber and Taper

These roll calliper gauges are based on the "Trotter", or scanning micrometer gauges familiar to the paper, aluminium and steel industries throughout the world for controlling the quality of roll re-grinding. 

They offer a quick, accurate and operator- insensitive means of roll measurement, quantifying both the camber and taper of the roll. The design permits measurements to be made right to the ends of the roll barrel.

A pre-adjustable yoke is carried within a four wheeled carriage which traverses the roll barrel length. The yoke carries the dial indicator to measure changes in roll diameter as the roll is traversed.

Operator Variability

The geometry of roll measurement is such that failing to measure across the maximum chord (diameter) can produce significant errors in the measured variation in roll diameter. It is common for operators using the same micrometer on the same roll to differ in their assessment of absolute diameter by as much as 0.15mm. ( “The metrology of large cylinders – exploiting the geometry” Dr. D. A. Armstrong & Dr. R. H. Thomas, Chartered Mechanical Engineer Sept. 1987 )

These callipers virtually eliminate this variability due to operator technique.

The geometry and sources of error are described in more detail in our Technical Note No. 9801.

Tailored Design

The design of the instrument can be tailored to your particular needs. For example, for customers dealing with mirror finish rolls, we supply the instrument with soft carriage wheel tyres and contact probe tips to avoid marking the roll surface.

Please contact us with your particular requirements at sales@metrologysystems.co.uk

Refurbishment

We offer a full refurbishment service to return callipers to the “as new” condition following prolonged periods of use in the harsh environment of the roll shop. This maintains the optimum measurement performance.