Cathode Flatness Fixture Using a Gimbal Datum Plane
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Solution Overview
Problem
Conventional methods for measuring cathode flatness in triodes for radio transmitters are inaccurate and non-reproducible, leading to low production yields.
Innovation Solution
An apparatus and method for direct, precise flatness testing of cathodes using a main fixture with a gimbal, rotating arms, and a micrometer to establish a datum plane, allowing for direct measurement of critical dimensions before and after coating application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional indirect measurement techniques are used for cathode flatness testing, then the testing process is simple, but the measurement accuracy and repeatability are poor
Solution Approach 1:
The testing apparatus is segmented into distinct functional modules: a main fixture for positioning, a gimbal mechanism for alignment, three rotating arms with micrometers for measurement, and a biasing member for applying controlled force. Each module performs a specific function, allowing the complex measurement task to be divided into manageable components that collectively achieve high measurement precision.
Solution Approach 2:
The patent replaces conventional indirect mechanical measurement techniques with a direct mechanical measurement system using three rotating arms equipped with micrometers. This substitution eliminates the inaccuracies of indirect methods by directly contacting and measuring the cathode surface at multiple points, providing precise flatness data through mechanical means.
2Productivity
If conventional testing methods are used, then the equipment is simple, but the production yield is low due to measurement errors
Solution Approach 1:
The apparatus incorporates feedback through the biasing member that applies controlled force to the cathode during measurement. This feedback mechanism ensures consistent contact pressure between the rotating arms and the cathode surface, improving measurement repeatability. The system continuously adjusts and maintains optimal measurement conditions, reducing errors and increasing production yield.
Solution Approach 2:
The gimbal mechanism performs preliminary alignment of the testing apparatus before the actual measurement takes place. By pre-aligning the rotating arms and establishing proper positioning, the system eliminates the need for repeated adjustments during measurement, thereby improving both measurement precision and production efficiency.
3Manufacturing precision
If indirect measurement methods are used, then the testing process is quick, but the dimensional accuracy of cathode measurements is poor
Solution Approach 1:
The patent measures flatness in multiple dimensions by using three rotating arms positioned at different angular locations around the cathode. Instead of a single-point measurement, the system captures dimensional data across multiple points and dimensions, providing comprehensive flatness assessment and ensuring manufacturing precision through multi-dimensional measurement.
Solution Approach 2:
The main fixture serves multiple functions: it provides structural support, positions the cathode, houses the biasing member, and accommodates the gimbal mechanism. This multi-functionality reduces the need for separate components, managing device complexity while achieving high manufacturing precision through an integrated measurement system.
Data Source
AI summary
An apparatus for testing flatness includes a main fixture defining a longitudinal axis along a direction between a base of the main fixture and a testing end of the main fixture. A gimbal is slidingly engaged to the main fixture to slide in a direction along the longitudinal axis. A biasing member is axially between the base and the gimbal. Three rotating arms are mounted to the testing end of the main fixture. The rotating arms and gimbal are configured to affix a test article in the testing end of the main fixture flat with respect to the three rotating arms to establish a datum plane for flatness testing of the test article.