Diadur process

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The Diadur process is used to produce extremely resistant precision graduations (for length and angle measuring devices ) on different surfaces.

The graduation lines are copied using a photolithographic method onto a surface that will later bear the graduation and then permanently etched there.

This reproduction process was developed around 1950 by Dr. Johannes Heidenhain GmbH developed and replaced the previous lead sulfide copying process ( METALLUR ), which made it possible for the first time to reproduce an original graduation exactly on metal from 1928 .

See also: glass scale , pitch circle