Diamond Doorknob on an Outhouse Door

Most of us have heard this expression; in manufacturing it typically relates to using a very high-quality component in producing a very low-quality product. Strain-gage-based transducers can face the same fate. You can use the best quality strain gages, but if you install them on poor-quality spring element material you will get a transducer with bad performance. Selection of material for the transducer spring element is paramount to good performance. Typical “good” spring materials in use are:

Low Modulus
2024-T4, T81 or T-351 aluminum alloy
BeCu 25
6 Al/4 Va titanium

High Modulus
4140 alloy steel
4340 alloy steel
17-4ph stainless steel (must be vacuum furnace grade)
15-5ph stainless steel

All but the aluminum alloys will require heat treatment to achieve the desired spring properties. Contact MM Applications Engineering for recommendations.

jweidner's picture

Jim Weidner

Chief Applications Engineer