Ra Mean Roughness
Din 4768, ISo/DIS 4287/1
The Average Roughness Ra is the arithmetic average of all departures of the roughness profile from the centre line within the evaluation length.
The Average Roughness Rq (DIN 4762/1 E) is the geometric average of all departures of the roughness profile from the centre line within the evaluation length.
PRECISION DEVICES, INC. Analog Surfometer System
System Components - System 3
● PDA analog amplifier
● PDP motor drive
● PDR reference standard
● PDG skidless tracer
● PDS stylus assembly
The system is designed to check the roughness average for small, difficult-to-reach surfaces. The motor drive is mounted on a granite base to minimize vibration and to provide level, stable surface for locating the work piece.
● PDA analog amplifier
● PDD motor drive
● PDL lite-touch linkarm
● PDR reference standard
● PDK tracer with SMT skidmount (for checking I.D.s & O.D.s from 1/8" (3.2mm) to flat)
or
● PDM tracer with SMA skidmount (for checking O.D.s & I.D.s from 3/4" (19mm) to flat - Min. I.D. 1 13/16" (46mm).
Skid-Referenced Tracers
PDK. The versatile PDK tracer, with the single SMT skidmount, can measure a 1/8" I.D. and O.D. to flat surfaces. The PDK has a series of standard, interchangeable double skidmounts available for most surface texture requirements.
PDM. Rugged and durable, the PDM style tracer provides accurate reading throughout the surface texture measurement range. From super-fine to high micro finished, the PDM tracer offers the reliability for critical surface evaluation. Standard skidmounts permit measurements on outside diameters as small as 1/8" to inside diameters from 1-13/16" to flat surfaces.
Skidless Tracers
PDG. The PDG tracer does not use skids, but has various standard stylus assemblies that mount onto the tracer beam.
Other standard tracers and accessories are available based upon specific applications. If a standard products does not meet your exact need, Precision Devices, Inc. will design and build a tracer or stylus assembly that will satisfy your requirements.
| SMT | 3.2mm (1/8") I.D. and O.D. to flat | ||||||||||||||||||||||||
| SML | 12.7mm (1/2") I.D. to flat | ||||||||||||||||||||||||
| SMM | 9.5mm (3/8") O.D. to flat | ||||||||||||||||||||||||
| SMV | 12.7mm (1/2") I.D. to flat for 2.54mm (0.100") cutoff | ||||||||||||||||||||||||
| SMW | 9.5mm (1/2") O.D. to flat for 2.54mm (0.100") cutoff | ||||||||||||||||||||||||
| SMQ Adapter | Required for SML, SMM, SMV, and SMW Skidmounts | ||||||||||||||||||||||||
| SML-1 | 12.7mm (1/2") I.D. to flat* | ||||||||||||||||||||||||
| SMM-1 | 9.5mm (3/8") O.D. to flat* | ||||||||||||||||||||||||
| SMV-1 | 12.7mm (1/2") I.D. to flat for 2.54mm (0.100") cutoff* | ||||||||||||||||||||||||
| SMW-1 | 9.5mm (3/8") O.D. to flat for 2.54mm (0.100") cutoff* | ||||||||||||||||||||||||
| * No adapter required Standard Skidmounts for PDM Tracers
|
Rapp Industrial Sales * 127 Main Street * Connoquenessing, Pa 16027
Phone 888-789-7277 * 724-789-7853 * Fax 724-789-7288 Email: sales @rappindustrialsales.com
