Digital Micrometer Spindle Speed Feedback Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Digital micrometers experience variance in measurement results due to the moving speed of the spindle when it contacts an object, primarily due to the wedge effect between threaded portions, which worsens with increased spindle speed.
Innovation Solution
A digital displacement measuring instrument that includes a spindle, an encoder for displacement detection, a speed information detector to calculate moving speed and acceleration, a judging unit to assess if the spindle has stopped and if its previous speed exceeds a threshold, and a notifying unit to alert the operator, allowing for corrected measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the spindle moving speed is increased to improve measurement efficiency, then productivity is improved, but measurement precision deteriorates due to wedge effect between threaded portions
Solution Approach 1:
The patent employs feedback by detecting the spindle's moving speed during measurement and providing notifications to the operator when the speed exceeds a predetermined threshold. The speed detector continuously monitors spindle speed, and the notifier alerts the operator to slow down, creating a closed-loop feedback system that guides operator behavior to maintain measurement precision while allowing flexible speed management.
Solution Approach 2:
The patent changes the operational parameter of spindle speed dynamically during measurement. By establishing a speed threshold and notifying the operator when this parameter exceeds the threshold, the system enables dynamic adjustment of the spindle speed parameter to optimize both measurement efficiency and precision based on real-time conditions.
2Stability of the object's composition
If a constant pressure mechanism is used to control measuring force, then measurement stability is improved, but measurement precision deteriorates due to spindle speed-dependent wedge effect
Solution Approach 1:
The patent introduces speed feedback to complement the constant pressure mechanism. While the constant pressure mechanism stabilizes the measuring force, the speed feedback system monitors and alerts the operator about excessive spindle speeds that cause wedge effect, creating a dual-control approach that addresses both force stability and speed-related precision issues.
Solution Approach 2:
The notification system acts as an intermediary between the spindle speed and the measurement outcome. It mediates the relationship by alerting the operator to speed conditions that would compromise precision, allowing the operator to adjust speed independently of the constant pressure mechanism's force control.
Data Source
AI summary
A digital displacement measuring instrument includes: a body; a spindle; an encoder; a display; a speed information detector that detects a moving speed of the spindle; a judging unit that judges whether or not the spindle is stopped based on the moving speed detected by the speed information detector and, when the judging unit judges that the spindle is stopped, judges whether or not the moving speed of the spindle just before the spindle is stopped exceeds a predetermined threshold; and a notifying unit that notifies a judgment result provided by the judging unit.