A low-cost approach to dimple grinding using a rotary tool

Area of Science:

• Materials Science
• Microscopy Techniques

Background:

• Conventional transmission electron microscopy (TEM) specimen preparation often requires expensive commercial dimple grinders.
• High costs limit accessibility to advanced microscopy techniques.

Purpose of the Study:

• To evaluate an affordable alternative for mechanical thinning in TEM specimen preparation.
• To assess the viability of consumer-grade rotary tools for producing high-quality TEM samples.

Main Methods:

• A functional dimple fabrication system was developed using an inexpensive rotary tool.
• TEM specimens were prepared using both a standard commercial dimple grinder and the developed rotary tool system.
• Crystalline quality was quantitatively assessed using convergent-beam electron diffraction (CBED) and symmetry analysis.

Main Results:

• The low-cost rotary tool method produced TEM samples with crystalline quality comparable to conventional approaches.
• An ultra-low-cost variation using steel bits maintained structural integrity without introducing defects.
• The developed method offers a two-orders-of-magnitude cost saving.

Conclusions:

• Inexpensive rotary tools provide a practical and accessible solution for routine, high-quality TEM specimen preparation.
• This approach democratizes access to advanced microscopy for research and education.