RS-200 Residual Stress Milling Guide

The most widely used practical technique for measuring residual stresses is the hole-drilling strain gage method described in ASTM Standard E837. With this method, a specially configured electrical resistance strain gage rosette is bonded to the test object's surface, and a small shallow hole is drilled through the center of the rosette. The local changes in strain due to the introduction of the hole are measured, and the relaxed residual stresses are computed from these measurements. The practicality and accuracy of this method are directly related to the precision with which the hole is drilled through the center of the strain gage rosette. The Micro-Measurements RS-200 milling guide provides a practical means to accomplish this task.

Watch a short RS-200 Video here.

Equipment to Support Residual Stress Testing

Special Residual Stress Rosettes in a variety of sizes
Gage Application Kits that contain the adhesive and installation supplies that are necessary for a successful strain gage installation
H-Drill Software for data reduction that is written by an industry-leading expert in the field of residual stress analysis
The Model P3 Strain Indicator and Recorder are used to capture the signal from the rosettes.

You will find that Micro-Measurements offers a complete solution for the measurement of residual stress testing using the hole-drilling technique and see the details below. Please contact our Applications Engineering Department if you would like to find out more about residual stress testing or other products offered by Micro-Measurements.

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RS-200 Milling Guide Equipment

PART NUMBER	DESCRIPTION

MMP920-000265	RS-200 MILLING GUIDE- COMPLETE UNIT
MMF336166	RS-200-CK2 GRIP ADHESIVE (5 PACK)

REPLACEMENT PARTS

MMF336166	RS-200-CK2 GRIP ADHESIVE
MMP920-000193	RS-200-FP REPLACEMENT FOOT PADS QTY 3 WITH TEMPLATE
MMP100-010569	RS-200 END MILL .062
MMP100-010573	RS-200 END MILL .125
MMP20X100033	RS-200-B1 REPLACEMENT BULB FOR LIGHTSOURCE
MMP27X300006	ATC-200-062 CARBIDE-TIPPED CUTTERS (5/PKG)
MMP27X300007	ATC-200-031 CARBIDE-TIPPED CUTTERS (5/PKG)

Residual Stress Strain Gage Rosettes

GAGE PATTERN AND DESIGNATION Insert Desired S-T-C No. in Spaces Marked XX.	RESISTANCE IN OHMS	DIMENSIONS
		GAGE LENGTH	GRID CTR’LINE DIA.	TYPICAL HOLE DIA.		MATRIX
				Min.	Max.	Length	Width

CEA-XX-062UL-120	120 ± 0.4%	0.062	0.202	0.06	0.08	0.50	0.62
		1.57	5.13	1.5	2.0	12.7	15.7
		Fully encapsulated with large copper-coated soldering tabs. Same pattern geometry as 062RE pattern.

CEA-XX-062UM-120	120 ± 0.4%	0.062	0.202	0.06	0.08	0.38	0.48
		1.57	5.13	1.5	2.0	9.6	12.2
		Fully encapsulated with large copper-coated soldering tabs and special trim alignment marks. Trim line spaced 0.068 in (1.73 mm) from hole center. Limitations may exist in data reduction equations.

EA-XX-062RE-120 EA-XX-062RE-120/SE	120 ± 0.2% 120 ± 0.4%	0.062	0.202	0.06	0.08	0.42	0.42
		1.57	5.13	1.5	2.0	10.7	10.7
		Most widely used RE pattern for general-purpose residual stress measurement applications.

EA-XX-031RE-120 EA-XX-031RE-120/SE	120 ± 0.2% 120 ± 0.4%	0.031	0.101	0.03	0.04	0.29	0.29
		0.79	2.56	0.8	1.0	7.4	7.4
		Due to small pattern size, measurement error can be magnified by slight mislocation of drill hole. Pattern not recommended for general-purpose applications.

EA-XX-125RE-120 EA-XX-125RE-120/SE	120 ± 0.2% 120 ± 0.4%	0.125	0.404	0.12	0.16	0.78	0.78
		3.18	10.26	3.0	4.1	19.8	19.8
		Larger version of the 062RE pattern.