Grinder Polisher Microprocessor Control Specimen Positioning
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Solution Overview
Problem
Existing grinder/polishers lack precise positioning control of the specimen holder relative to the platen, leading to inadequate debris removal and potential overheating during aggressive grinding, which affects specimen preparation quality.
Innovation Solution
The improved grinder/polisher incorporates a microprocessor-controlled system with a load cell and lead screw drive for precise vertical positioning of the specimen holder, along with a replaceable bowl liner and LED illumination for enhanced visibility and debris management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the holder is moved toward and away from the platen using a drive motor, then the grinding and polishing operation can be performed, but there is no positive positioning control to precisely control the position of the holder relative to the platen
Solution Approach 1:
The patent replaces the purely mechanical drive motor positioning system with an automated control system that uses a microprocessor, load cell sensor, and lead screw mechanism. This substitution enables precise positioning control through electronic feedback from the load cell, which detects when the holder contacts the platen, eliminating the need for complex mechanical positioning adjustments while achieving superior positioning precision.
2Productivity
If water or fluid is used to rinse the bowl to clear debris, then the grinding and polishing operation can continue, but debris can still collect in the bowl and cause accumulation
Solution Approach 1:
The patent extracts the debris removal function from the bowl by introducing a separate suction system with a vacuum source that directly removes debris from the bowl area. This extraction mechanism operates independently from the rinsing system, allowing continuous operation while effectively preventing debris accumulation through active removal rather than passive rinsing.
Solution Approach 2:
The patent introduces a suction system as an intermediary mechanism between the debris generation point and the removal process. The suction system acts as a mediator that actively transports debris away from the bowl, preventing accumulation while allowing the bowl to remain functional for continuous grinding and polishing operations.
3Productivity
If aggressive grinding is performed to prepare the specimen, then the grinding and polishing action is effective, but the platen can heat up which adversely affects specimen preparation
Solution Approach 1:
The patent introduces a fluid delivery system as an intermediary cooling mechanism that supplies water or other cooling fluids to the platen during aggressive grinding operations. This intermediary system absorbs heat from the platen through the flowing fluid, maintaining platen temperature within acceptable ranges while allowing high-efficiency grinding to proceed without thermal damage to the specimen.
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 solution enables precise control of the grinding and polishing process, reduces debris accumulation, and maintains optimal platen temperature, resulting in improved specimen preparation quality and operational efficiency.
Implementation Method 1
The load cell is adapted to sense contact between the specimen holder and the platen when the second drive is operating in a forward direction
Implementation Method 2
a lead screw drive for precise vertical positioning of the specimen holder
Implementation Method 3
A slurry, generally abrasive, is injected onto the platen to provide an abrasive medium for grinding and polishing the specimen
Implementation Method 4
the platen can heat up which, it is believed, can adversely effect specimen preparation
Data Source
AI summary
An improved grinder/polisher includes a base having a bowl, a rotating drive plate and a drive plate drive that is adapted to support a platen. The grinder/polisher includes a head configured to support a specimen holder. The head has a first drive for rotational drive of the specimen holder and a second drive for moving the specimen holder toward and away from the drive plate. The head includes a load cell operably connected to the first drive and a counter operably connected to the second drive. The counter is configured to determine movement and the extent of movement of the head toward and away from the drive plate. The grinder/polisher includes a control panel mounted within a housing and including a microprocessor controlled control system having a touch panel or screen.