Bullet Comparator V-Groove Floating Chamber Alignment
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Solution Overview
Problem
Current methods for determining the overall length of small-arms bullets are imprecise and variable due to reliance on user skill and the use of ring-contact fixtures, which can misalign bullets, leading to inconsistent measurements.
Innovation Solution
A bullet comparator with a V-shaped groove and a floating bullet chamber that uses multiple point contact geometry to ensure consistent alignment, combined with a dial indicator for precise measurements, reducing variability and improving repeatability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a ring-contact fixture is used to hold the bullet, then the bullet can be positioned for measurement, but the bullet alignment becomes imprecise and variable
Solution Approach 1:
The fixture is segmented into multiple contact points (first ring-contact line and second ring-contact line) that separately constrain different aspects of bullet positioning. The first ring-contact line constrains radial position while the second ring-contact line constrains axial position, dividing the alignment function into independent segments that collectively achieve precise positioning.
Solution Approach 2:
A floating bullet chamber is introduced as an intermediary component between the bullet and the fixed fixture. The chamber floats on the V-shaped groove, allowing it to self-align with the bullet while providing stable reference surfaces. This intermediary absorbs alignment errors and provides a consistent measurement reference frame.
2Device complexity
If a fixed ring-contact fixture is used, then the measurement setup is simple, but repeatable measurements become difficult due to off-center placement
Solution Approach 1:
The bullet chamber transitions from a fixed position to a floating position that can dynamically adjust to the bullet's actual location. The chamber floats on the V-shaped groove and can shift position along the groove while maintaining contact with both ring-contact lines, allowing it to adapt to variations in bullet placement and ensure consistent measurement geometry.
Solution Approach 2:
The system changes the positional parameter of the bullet chamber from fixed to variable. By allowing the chamber to float and move along the V-shaped groove, the system accommodates different bullet positions while maintaining the same measurement reference, thereby improving repeatability without increasing structural complexity.
3Productivity
If manual alignment techniques are used to square the bullet, then measurement can be obtained, but user skill and dexterity are heavily required
Solution Approach 1:
The measurement system performs self-alignment through the floating chamber mechanism. When the bullet is inserted, the chamber automatically floats to a position where both ring-contact lines engage the bullet, squaring the bullet to the measurement axis without user intervention. This eliminates the need for manual alignment skills while maintaining measurement accuracy.
Solution Approach 2:
The floating chamber acts as a mediator that automatically establishes the correct measurement geometry. Instead of requiring the user to manually square the bullet, the chamber's floating mechanism on the V-shaped groove automatically positions itself to provide the proper reference, transferring the alignment function from the user to the device.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides highly accurate and repeatable measurements of bullet length, with a precision of plus or minus 0.0002-0.0003 inches, and accommodates various bullet sizes and shapes, enhancing the speed and efficiency of sorting bullets.
Implementation Method 1
The floating bullet chamber uses a multiple point contact geometry inside the fixture to provide a first ring-contact line about the bullet's circumference and at least one additional (second) ring-contact line
Implementation Method 2
Spring tension caused by the operation of the dial indicator against the bullet, which is supplied by the internal spring of the dial indicator, provides a consistent and uniform compression of the bullet into the floating chamber
Data Source
AI summary
The present invention provides a device and method for improved, repeatable, consistent, rapid, and accurate measurements of a bullet using a dial indicator. The bullet comparator of the present invention consists of a fixture block having a V-shaped groove running along a long axis of the block and a dial indicator coupled to one end of the fixture, configured so its probe operably moves toward the center of the fixture. A stop block adjustably positions in the V-shaped grove of the fixture. And, at least one floating chamber selectively positions in the V-shaped grove of the fixture. The floating chamber is a cylindrical body defining an interior chamber; the interior chamber has a first ring-contact and at least a second ring-contact on an interior portion of the chamber.