Indicator Inspection Machine Oscillation Control
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Solution Overview
Problem
Indicator inspection machines with linear drive mechanisms face limitations in measuring repeatability due to constant contact status between the spindle and the inspection machine, which restricts accuracy and require high-cost drive mechanisms to simulate free fall conditions for backlash detection.
Innovation Solution
An indicator inspection machine with a measurement spindle that can be freely raised and lowered, featuring a drive mechanism controlled to change speed periodically and oscillate at the natural frequency, incorporating a controller with feedback mechanisms to adjust the spindle's position and speed, and optionally using a stepping motor or oscillating mechanism to vary contact conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the spindle of the indicator inspection machine is raised and lowered without rotation using a linear drive mechanism, then the inspection efficiency is improved and indication error measurement is accurate, but the contact status between the contact point of the indicator and the contact point of the indicator inspection machine remains mostly constant, limiting the accuracy of repeatability measurements
Solution Approach 1:
The invention applies the dynamics principle by enabling the measurement spindle to rotate in addition to being raised and lowered. This rotational movement dynamically changes the contact status between the contact point of the indicator and the contact point of the indicator inspection machine during each measurement cycle, allowing the system to capture variation due to the contact point while maintaining high inspection efficiency through automated operation.
2Measurement precision
If the spindle of the indicator inspection machine is driven at an acceleration greater than free fall to detect variation due to backlash, then the measurement capability is improved, but a high-cost drive mechanism (motor or the like) is necessary and achieving such operation is difficult
Solution Approach 1:
The invention applies mechanical vibration by causing the measurement spindle to oscillate at its natural frequency during the measurement process. This oscillation creates the necessary dynamic contact conditions to detect backlash variation without requiring complex high-cost drive mechanisms capable of exceeding gravitational acceleration. The natural frequency oscillation is achieved through the interaction between the indicator and inspection machine components themselves.
Solution Approach 2:
The invention applies self-service by utilizing the natural frequency of the indicator inspection machine system itself to generate the oscillation needed for backlash detection. Rather than requiring an external high-cost drive mechanism to impose oscillation, the system uses its own inherent dynamic characteristics, eliminating the need for expensive additional components while maintaining the capability to detect backlash variation.
3Ease of operation
If the contact point of the indicator and the contact point of the indicator inspection machine maintain constant contact status, then the device operation is simple, but the accuracy of repeated measurements is limited due to inability to detect variation due to the contact point
Solution Approach 1:
The invention resolves this contradiction by introducing rotational movement of the measurement spindle, which dynamically varies the contact status between the two contact points during each measurement cycle. This dynamic approach maintains operational simplicity through automated control while enabling the detection of contact point variation, thereby improving repeatability measurement accuracy without complicating the operation.
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
This approach allows for accurate inspection of variations influenced by contact status fluctuations, enhancing repeatability measurement accuracy without the need for high-cost drive mechanisms and preventing damage from constant contact, while maintaining reliability and efficiency.
Implementation Method 1
the controller controls the drive mechanism such that the measurement spindle is raised and lowered while oscillating at the natural frequency of the indicator inspection machine
Implementation Method 2
based on the speed of the measurement spindle and the detected position of the measurement spindle, the controller provides feedback control of operation of the measurement spindle
Implementation Method 3
having a detection mechanism detecting a position of the measurement spindle
Implementation Method 4
a speed detector detecting a rotation speed of the motor
Data Source
AI summary
An indicator inspection machine inspects the accuracy of an indicator based on a value displayed by the indicator when a spindle changes position. The indicator inspection machine includes a measurement spindle provided so as to be freely raised and lowered in order to displace the spindle of the indicator; a contact point provided to a distalmost end of the measurement spindle, the contact point making contact with an indicator contact point provided to a distalmost end of the spindle of the indicator; a drive mechanism driving the measurement spindle; and a controller controlling the drive mechanism so as to bring the contact point into contact with the indicator contact point while changing a speed of the measurement spindle at a predetermined periodicity.