Dimpler

The VCR Dimpler is used to mechanically pre-thin TEM specimens prepared by the precision core drill or other sampling methods. Dimpling produces an ultra thin (~20 micrometers) region necessary for further thinning by non-mechanical means (ion milling) while maintaining a sturdy peripheral thickness for specimen handling. This is accomplished by a wheel rotating on a rotating specimen (held parallel to the wheel's edge) [see diagram below], slowly eroding a depression, or dimple, in the specimen surface.

• Assorted tools for flattening, flat polishing, dimpling, and dimple polishing
  • Diamond impregnated wheels for rough dimpling
  • Soft metal wheels for use with abrasive dimpling media for medium dimpling
  • Cloth covered wheels for use with abrasive dimpling media for fine dimpling
• Magnetically coupled damping
• Variable force set point
• Variable speed and damping control
• Smooth and continuous rotation motion for the tools and specimen
• Non-contact position sensor
• In-situ specimen thickness measurement
• Thinning termination accurate to within 1 micrometer