Datasheet

Document Number: 11304 [e-mail] www.vishaymg.com
Revision: 05-Sep-06 61
RS-200
Vishay Micro-Measurements
Milling Guide
for Residual Stress Measurements
After alignment, the microscope is removed from the guide,
and the milling bar or high-speed air turbine is inserted in its
place. The milling bar is used for slow-speed drilling of the
hole. Two standard milling cutters are supplied: 0.062 and
0.125in (1.6 and 3.2mm) diameter. The milling bar is
equipped with a universal joint for flexible connection to a drill
motor.
Conventional slow-speed milling may be satisfactory on
some mild steels and aluminum alloys. But high-speed
drilling is generally the most convenient and practical method
for introducing the hole in all test materials. (When residual
stresses are to be measured on materials such as stainless
steels, nickel-based alloys, etc., ultrahigh-speed drilling
techniques are preferred.) For this purpose, a high-speed
air-turbine assembly, along with a supply of tungsten
carbide-tipped cutters [ten each 0.031in (0.8mm) diameter
and 0.062in (1.6mm) diameter], is supplied with the milling
guide. A foot pedal control is included for operating the air
turbine.
A micrometer depth set attachment, available in English or
metric units, is provided with each milling guide assembly.
This device is used for incremental drilling when information
on the variation of residual-stress-with-depth is desired.
Other items supplied include a plastic template for the proper
location of the milling guide foot pads on the test part and a
special break-off tool used to remove the foot pads from the
part after the test is completed. All components are housed
in a sturdy carrying case. The guide is approximately 9in
(230mm) high, and 4.5in (114mm) wide at the base.
A fast-setting-cement kit, used to firmly attach the guide to
the test part, is available as an accessory item.