Taper, Trim, and Neckdown
After head turning, the case is slightly longer than the finished product and is a near-perfect cylinder. Most cases are ultimately tapered to some degree. The case is run into a die. If a small taper is needed, one die can suffice; for more pronounced tapers, the taper is produced progressively to reduce stresses.
Many rifle cartridges have a distinct bottlenecked shape. The neck and shoulder that create the bottleneck shape are also produced in a die or in a series of dies (if the neck diameter is much smaller than the case body).
Once the final profile is formed, the case is trimmed to the specified length. Trimming can be performed on a machine with a cutter that is moved to work the open end of the case (similar to the head-turning machine). Trimming can also be performed in a machine with a rotating cutter; the cutter axis aligns with the case axis. It moves down onto the case mouth, and a preset stop halts the cutter when the correct length is reached.
Additional Online Courses
- What Every First Responding Officer Should Know About DNA Evidence
- Collecting DNA Evidence at Property Crime Scenes
- DNA – A Prosecutor’s Practice Notebook
- Crime Scene and DNA Basics
- Laboratory Safety Programs
- DNA Amplification
- Population Genetics and Statistics
- Non-STR DNA Markers: SNPs, Y-STRs, LCN and mtDNA
- Firearms Examiner Training
- Forensic DNA Education for Law Enforcement Decisionmakers
- What Every Investigator and Evidence Technician Should Know About DNA Evidence
- Principles of Forensic DNA for Officers of the Court
- Law 101: Legal Guide for the Forensic Expert
- Laboratory Orientation and Testing of Body Fluids and Tissues
- DNA Extraction and Quantitation
- STR Data Analysis and Interpretation
- Communication Skills, Report Writing, and Courtroom Testimony
- Español for Law Enforcement
- Amplified DNA Product Separation for Forensic Analysts