The basic elements of a ZOLLER tool presetter and measuring machine are made of a specially-hardened light alloy, which offers higher tensile strength and better temperature conductivity than cast iron or granite. The base frame is braced by a large number of precisely calculated supporting struts that stabilize the structure and minimize distortion.
Benefits of Light Alloy

One of the biggest benefits of the alloy is its ability to diffuse the temperature differences and therefore prevent distortion.
 
Its thermal conductivity makes it the perfect substance for a production area that undergoes rapid environmental changes.
 
 
Cut to the chase, the ZOLLER presetter made out of light alloy can be placed on the shop floor and it will show repeatability with every measurement. ZOLLER machines achieve an accuracy of +/- 2 microns. Cast iron, and especially granite, show poor quality compared to the light alloy in this regard if not installed in a not climate controlled environment.
 
Frequent Arguments for Cast Iron and Granite
 
The supporters of cast iron and granite highlight features like solidity, coefficient of expansion, and the metal’s vibration-reducing capability. Cast iron, by evidence, is no more solid than light alloy due to its low tensile strength. The coefficient of expansion is of no relevance because we do not measure at the base but at the glass scales. The ZOLLER presetter and measuring machines use superior quality Heidenhain glass scales, covered by light cast alloy shells.
The vibration-reducing feature of the cast iron holds true, but the presetter is not used to mill anything, hence the feature has no value for machines used for tool measuring and presetting.
 

The advantages of the light alloy have been appreciated by all leading manufacturers of industrial machines, the automotive industry, the aviation and space industry, the medical and laboratory industry. Not surprisingly, all these industries have started using more and more light alloy for the products in their field of operation.