Rubert 100 Series Heavy Duty Surface Roughness Comparator

Rubert 100 Series Heavy Duty Surface Roughness Comparator

Product Description

These comparators are intended for heavy duty use in workshop or shop floor environments. Each one consists of between 5 and 8 specimens mounted in a tough nylon frame and protected by a leather wallet. The specimens in each comparator are metal surfaces produced by the same machining process, but with roughness values ranging from the roughest to the smoothest normally obtained by that process. The nominal values are the ones specified in the various standards that describe roughness comparison specimens: BS 2634, ISO 2632, and ASME (formerly ANSI) B46.1

The actual average values of the roughness are well within the tolerances – usually +12%, -17% of the nominal value. The label on the front of the scale states the nominal Ra value in both Microns and Micro Inches. Full details on roughness values are shown below

Applications

Use the comparison specimens to estimate the roughness of a machined surface, in order to select a cutoff value prior to accurate measurement by a stylus instrument (as specified in BS EN ISO 4288). Besides that they also provide valuable guidelines and references which can be consulted during the machining of a part whose roughness has been specified on the drawing.

Method of Use

Comparison specimens are easy to use. Just run a fingernail over your work piece, and then over the specimens. Estimate its roughness by comparing with the scale of specimens.

The Rubert 100 Series Heavy Duty Surface Roughness Comparator can be used in accordance with:

• BS 2634
• ISO 2632
• SME (formerly ANSI) B46.1

Specifications

Specifications

     

Range of Roughness Values

Item No Machining Method No of Patches Ra (µm) N-Groups
115 Surface Grinding 8 0.025 to 3.2 1 to 8
116 Cylindrical grinding 8 0.025 to 3.2 1 to 8
117 Flat Lapping 4 0.025 to 0.2 1 to 4
Criss-cross / parallel 4 0.025 to 0.2 1 to 4
118 Cylindrical lapping + superfinishing 8 (4+4) 0.025 to 0.2 1 to 4
119 Face turning 8 0.4 to 50.0 5 to 12
120 Cylindrical turning 8 0.4 to 50.0 5 to 12
121 End Milling 8 0.4 to 50.0 5 to 12
122 Reaming and drilling 8 (4+4) 0.4 to 3.2

1.6 to 12.5

5 to 8

7 to 10

123 Horizontal Milling 7 0.8 to 50.0 6 to 12
125 Shaping (planning) 7 0.8 to 50.0 6 to 12
126 linishing (belt sanding) 6 0.1 to 3.2 3 to 8
128 Vertical grinding 6 0.2 to 6.4 4 to 9
129 Grit blasting (angular particles) 6 0.4 to 12.5 5 to 10
58 Shot blasting (spherical particles) 6 0.4 to 12.5 5 to 10
131 Spark erosion (EDM) 7 0.4 to 25.0 5 to 11
133 Hand filing 5 0.4 to 6.4 5 to 9
134 Castings 7 0.8 to 50.0 6 to 12
135 Honing 6 0.05 to 1.6 2 to 7
136 Polishing 5 0.0125 to 0.2 0 to 4

 

Data Sheet

Standards

Standards

The Rubert 100 Series Heavy Duty Surface Roughness Comparator can be used in accordance with:

• BS 2634
• ISO 2632
• SME (formerly ANSI) B46.1