What is Surface Roughness Comparator
Surface roughness comparator is uses within industry to measure or verify the as-manufactured surface finish (roughness) of a part or assembly. Comparator are selected and used based on the manufacturing process use to create a particular surface finish. Industries standard manufacturing specific roughness comparators are available for the following process:
- Conventional machining
- Surface Turned
- Shot Blast and Grit Blast
Typical of surface roughness comparators:
TQC Sheen Steel Surface Roughness Comparators.
TQC Comparison standard according to ISO 8503-1 part 1 made of quality steel. Indicates the surface condition of blasted steel according to ISO 8503 in grades of fine, medium, and coarse. Can be use in accordance with ASTM D4417 Method A, ISO 8503-1, ISO 8503-2. Comparison standard according to ISO 8503 part 1 made of quality steel. Indicates the surface condition of blasted steel according to ISO 8503 in grades of fine, medium, and coarse. The Surface Roughness Comparator for grit-blast and shot-blast surface profile comparison measurement of blast-cleaned steel. The Surface Roughness Comparator is supplies in a protective Wallet.
When steel has been blast-cleaned, the surface consists of random irregularities with peaks and valleys that are not easily characterize. Because of this random nature, it is recommend that the profile should be identify as either angular (where grit abrasives have been used) or dimpled (where shot abrasives have been used) and that they should be graded as fine, medium or coarse using the four segments on the Comparator. Fine-grade profiles equal to segment 1 and up to but excluding segment 2. Medium-grade profiles equal to segment 2 and up to but excluding segment 3. Coarse-grade profiles equal to segment 3 and up to but excluding segment 4.
TQC Comparator Disc Feature:
- High purity nickel reference plates
- Electro formed profile
- Each profile copied from a certified mild steel master
- Sturdy leather wallet to protect the test surfaces when not in use
- Available for shot- and also grit blasting
Rugotest No. 3 is Comparison standard for blasted surfaces, consisting of both 6 examples of grit-blasting and also shot-blasting. The method complies with ASTM D 4417/A, and also supplied with a case. Surface finish specimens for testing surface roughness by the sight and touch method.
Rugotest kit is come with:
The Sight and Touch method
The assembled specimens is to represent, for the most commonly-used machining methods. The limiting values of surface finish quality arranged in a geometrical progression in accordance with factor 2.
These among chosen value recommended for the criterion “Ra” in the both ISO standards 2632/I-1975 and 2632/II-1977.
Experience shows that the method of comparing a machined surface with a known sample, by sight and touch. Enables the quality of the finish of this surface to be estimated with remarkable accuracy.
The remotest method is particularly convenient when specifying surface finish for components which feature in sub-contracting arrangements, sales contracts, etc.
The samples supplied are for use only in sight and touch comparisons, not as references for calibrating surface finish measuring instruments of any type.
Although the Rugotest is a simple and inexpensive tool, the reliability of the results it provides makes it highly useful at the levels of any manufacturing industry.
When opened, the left-hand page gives the most important information for the design office, the workshop and the classroom, as well as a summary of the relevant ISO standards for surface finish and the graph showing the relationship between production cost and surface finish.
Surface roughness comparison standard, model RUG 3 for shot- and grit blasting.
Material : High-nickel test plate
Width : 90mm
Length : 118mm
Standard :Complies with standards NF/E05-051, ASTM D 4417/A, ISO 2632 / I 1975, ISO 2632/II 1977. Look up the appropriate standard for a correct execution of the test.
KTA Surface Profile Comparators.
Comparators for determining surface roughness by both touch and sight. Conforms to ASTM D4417. The KTA standard not only has 5 different grades of roughness but also three different versions. Its also available in Imperial units. The Keane-Tator Surface Profile Comparator assess surface profile depth (generated by abrasive blast cleaning) not only quickly and also easily with these durable 3″ reference discs.
Through the hand held illuminated magnifier on the five segments comparator reference discs for view the blast cleaned surface. Three reference discs are available; the disc selected is based on the abrasive used to prepare the steel surfaces. Reference disc choices include first for surfaces prepare with sand, secondly for surfaces prepared with steel shot and the last for surfaces blast cleaned with a grit or slag abrasive. Each disc is a high purity nickel electro-formed copy of a master disc duplicated to within +/- 50 micro inches. The standard kit includes a choice of one reference disc (choose upon ordering) in a vinyl pouch and an illuminated magnifier equipped with a magnet to hold the reference disc in place during inspections. Conforms to ASTM D4417, Method A.
Comparators allow the estimation of surface roughness by both touch and sight. Surface Profile: The proper and effective preparation of a surface prior to coating is essential. The correct roughness or profile has been generate is essential, if the profile is too low, the adhesion of the coating to the surface will be reduce. Too high and there is the danger that the profile peaks will remain uncoated – allowing rust spots to occur.
KTA Surface Roughness Comparators Specification
- Firstly is the three version : sand, grit and shot
- Secondly is Five different grades of roughness in each comparator
- Thirdly is Design to be use with the illuminated magnifier.
- Finally is vailable in Imperial units only.
For more detail and information please contact us.