Shims Ensure Axial Compensation

By using laminated metal shims, tolerances can be adjusted accurately up to 25 micrometers without grinding.

One of the leading manufacturers of shims of this kind is Georg Martin. The company produces three different types of shim: laminated shims of the type M-Tech L consist in the standard range of up to 64 laminated metal films with thicknesses ranging from 50 to 75 μ which are "peeled off ” individually with a hand-held knife until the desired thickness is achieved. M- Tech S consists of solid shims which are available in polished, self- adhesive or assorted versions. To round it all off, M-Tech P shims are thin metal sheets of different thicknesses which are glued at the edges, packaged and used like a tear- off calendar. The geometry of the shims is in line with construction specifications.

Martin supplies ready-for-use spacer rings and ring segments of the type M-Tech L with drill holes for the work rolls of a large mill train manufacturer, for example. Their thickness can be adjusted from 0.5 to 3.2mm, depending on requirements. The shims are required because a combination of different fits has to be taken into account due to the complexity of the work roll bearings.