Abstract
A new stylus-type electrical roughness measuring instrument has been developed by the authors. The instrument was designed in conformity with the definition of center line average height prescribed in ASA, B. S and JIS (Japanese Industrial Standard). Before its development electrical and mechanical problems of the instrument were discussed, that is, dynamic characteristics of a mechanical system of a stylus, frequency characteristics of electrical circuits, cutoff method of waviness and stylus driving systems. As a ceramic transducer is used for the roughness pick-up and all the recording circuits are transisterized, the instruments is designed very compact.
Main specification of the instrument are as follows :
1. Pick-up
Stylus……diamond, 5 μ (or 12.5 μ) tip radius.
Stylus pressure……1 gram (approx.)
2. Amplifier
Range……0.075, 0.25, 0.75, 2.5 and 7. 5 μ.
Roughness width cutoffs……0.075, 0.25, 0.75 mm
Outputs……profile, average.
3. Motor Driver
Traverse speeds
(for continuously-averaging) ……3mm/s
(for recording) ……0.3 mm/s
Reversing time……0.01 second (approx.)
Length of stroke adjustable from 75 mm to less than 1.5 mm.
