Surface Roughness Testing - tesatool.com

1 Surface Roughness Testing Surface Roughness Testing J-1. Surface Roughness Testing Summary of Roughness Application of Roughness Parameters Commonly Used Comparison Specimens Arithmetical mean deviation of the For a long time, these specimens for Testing the profile Ra Surface finish quality have proven their value in (ISO 4287, DIN 4768) practical use. The arithmetical mean deviation of the profile They serve for touch and/or sight comparisons Ra is the mean value of the absolute value of with the Surface of the workpieces that are the profile departure y within the reference manufactured using the same method. length l. Condition is that materials have to be compa- rable. Max. profile valley depth Rmax The comparison of the Roughness of the work- (DIN 4768). piece Surface is not quantitatively expressed. The max.

2 Profile valley depth Rmax is the largest The extent to which the surfaces of both the of the existing single Roughness depths Zi in the specimen and the workpiece are matched is total measuring length lm. appreciated subjectively only. According to ISO 4288 and DIN 4287 - Part 1, Sight comparison requires optimum light source this parameter is also called Ry max. angle. For small surfaces , the use of a magni- Mean Roughness depth Rz DIN fying glass with up to 8x magnification is recom- (DIN 4768) mended. The mean Roughness depth Rz is the arithmeti- Touch comparison is made using the finger nail cal mean of the single Roughness depths of or a small cooper piece like a coin, for instance. successive sampling lengths le. According to ISO 4287 and DIN 4762, the para- meter Rz DIN is also called Ry5. Because Rz is named differently in DIN 4768.

3 And ISO 4287, this paramater is also called Rz DIN and Rz ISO. When the parameter Rz is measured according to DIN, it is generally admitted that the extrem value ISO is also matched providing that Rz DIN. is not exceeding Rz ISO. lt R max Z3. Z1. Z2. Z4. Z5. y m Ra 0. x Ie 5 x le = lm l Pre-travel length Post-travel length J-2. Surface Roughness Testing RUGOTEST Roughness Comparison Specimens For touch and/or sight comparisons with the Surface of workpieces Sets of Roughness comparison specimens DIN 4769 part 1 for individual machining methods according and part 2. to ISO Roughness parameters Rust-resistant, Nickel Specimens RUGO- Number ISO. for Roughness TEST of single Roughness comparison are no No. specimens parameters reference specimens. They are not suitable RUGOTEST A4. for calibrating Surface consisting of the following single specimens : Roughness testers.

4 Metal working 1 27 N2 to N10. Hand grinding 2 6 N6 to N11. Leather case Shot blasting 3 18 N6 to N11. Hand filing 4 6 N6 to N8. RUGOTEST A6. consisting of the following single specimens : Planing 101 6 N6 to N11. Turning 102 6 N5 to N10. Face milling 103 6 N5 to N10. Surface grinding 104 8 N1 to N8. Cylindrical grinding 105 8 N1 to N8. Spark erosion 107 6 N5 to N10. RUGOTEST. No. mm g 1 135 x 105 160. 2 120 x 90 160. 3 120 x 90 190. 4 120 x 90 160. 5 120 x 90 200. 101 110 x 50 110. 102 110 x 50 105. 103 110 x 50 110. 104 130 x 50 125. 105 130 x 50 130. 107 110 x 50 110. 12 127 x 27 60. A4 330 x 250 710. A6 330 x 250 780. J-3. Surface Roughness Testing Executions for individual machining methods according to ISO Roughness parameters ISO Roughness parameters N0 N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11. Arithmetical mean deviation of profile Ra m 0,0125 0,025 0,05 0,1 0,2 0,4 0,8 1,6 3,2 6,3 12,5 25.

5 In 1 2 4 8 16 32 63 125 250 500 1000. Ten point height of irregularities Rz ISO m / in Characteristic related data may differ depending on the machining method applied RUGO- Number TEST of single No. specimens Metal working 1 27. Side milling 3 . Face milling 5 . Turning/Planing 5 . Grinding 6 . Lapping 4 . Finish grinding/Honing 4 . Hand grinding 2 6 . Shot blasting 3 18. Shot-blasting mean spherical coarse 3 . fine 6 . angular coarse 3 . fine 6 . Hand filing 4 6. straight 3 . crossed 3 . Hand polishing 5 10. Surface form cylindrical 5 . plane 5 . Planing 101 6 . Turning 102 6 . Face milling 103 6 . Plane grinding 104 8 . Circular grinding 105 8 . Spark erosion 107 6 . Execution according to Charmille Roughness parameters (VDI 3400). Charmille Roughness parameters 12 15 18 21 24 27 30 33 36 39 42 45. Arithmetical mean deviation of profile Ra m 0,40 0,56 0,80 1,12 1,60 2,24 3,15 4,5 6,3 9,0 12,5 18,0.

6 Number of single specimens Spark erosion 12 . J-4. Surface Roughness Testing TESA RUGOSURF Surface Roughness Gauge Mobile and versatile Roughness gauge that can be used in manufacturing cells, receiving inspection and measurement laboratory Solidly built and easily handle The selected accessories allow to inspect a wide variety of forms and shapes of workpiece surfaces Measurements can be perfor- med in virtually any position Measure small bores as well as grooves. The following Roughness parameters can be measured: Arithmetical mean deviation of the profile Ra ISO 4287, DIN 4762, DIN 4768. Measuring prin- Max. height of the profile Ry ISO 4287, DIN 4762. ciple of the contact Max. profile valley depth Rmax ISO 4287, DIN 4768. system, piezoelectric Mean Roughness depth Rz DIN DIN 4768 also called corresponds to Ry5 ISO 4287.

7 3-digit LC display Integrated drive unit. Interchangeable probes with either a transverse or parallel chisel stylus. 0,01 m Easy-to-use parameter selection switch. 1 in Comfortable, reliable reading of the results on the digital display. See adjoining Digital output for a direct value transmission to TESA PRINTER SPC. table or to a computer unit. Classe 2. ( 10 %). according to DIN 4772. Cut-off: mm /. in (ANSI 2RC filter) 4 possible measuring positions of the stylus The total measuring lenght lm may be set for 1, 3 or 5. cut-off-lenghts Feed rate Vt : 5 mm / s 270 . 15 mN. RS 232. 180 . 9 V alkaline ba- 90 . tery, IEC 6F22. 3000 h Durable cast aluminium housing TESA RUGOSURF Surface Roughness Gauge delivered with the following standard accessories : 1 standard probe with a 90 conical diamond stylus, 10 C to 45 C.

8 5 m in tip radius 1 Roughness standard, nominal value Ra = 3,1 m - 20 C to 65 C 7,9. respectively 122 in Basic instrument 1 bottom plate, associated with the reference without probe: standard 140 x 76 x 25 mm 1 9 V alkaline battery, IEC 6F22. basic instr. without probe: 435 g 3,8. Plastic case Evaluation Total displacement Declaration lenght l / lm length lt Cut-off of conformity. m in mm in mm in mm Available upon request: reference standard Ra 0,03 6,35 1 250 0,8 2,0 1 x 0,8. No. with Ry 0,2 25,3 8 999 2,4 3,5 3 x 0,8. calibration certificate Ra / Rz DIN / Rmax 0,2 25,3 8 999 4,0 5,0 5 x 0,8. J-5. Surface Roughness Testing Special Accessories for TESA RUGOSURF . Surface Roughness Gauge Transport packing 7,9. 7,9 7,1. 2,4. 1,3. 1,8 19,3. 3,8 1,3 3,8 70,6. Transverse chisel probe Parallel chisel probe Small bore probe Sapphire chisel stylus for measuring Diamond chisel stylus for lateral For measuring diameters ranging from small shafts, sharp edges etc.

9 Measurement on small shafts, sharp 3,2 mm respectively 1/8 in, 90 conical 90 chisel stylus,10 m in radius. edges etc. 90 chisel stylus, 10 m in diamond stylus, 10 m in tip radius radius. 73,6 7,9. 14,2. 2. 2,8. Groove bottom probe Measuring stand Universal stand For measuring hard-to-reach recesses, Clamp for vertical and horizontal 250 x 270 mm cast iron bottom plate, 90 conical diamond stylus, 10 m in tip positioning of the instrument. Adjustable with ground measuring face. Vertical radius device for height position. column, 31,7 mm in diameter, 213 mm high. Adjustable swivel clamp. Vee fixture Vee adaptor kit for checking hard-to- Bottom plate with Vees Bottom plate with a Vee for holding reach surfaces on shafts For measuring small parts (min. Surface shafts up to 25 mm or 1 in dia. 3 interchangeable Vees for diameters 19 x 19 mm) and short shafts with diame- Clamp for height adjustment.

10 All parts from 5 to 125 mm respectively from ters from 6,35 mm respectively in, are nickel-plated. to 5 in. and length of 38 mm or in. J-6.