Linear and rotary movement of a shaft

AI Thread Summary
To design a parallel plate rheometer, the top plate must rotate and move vertically to accommodate fluid placement and removal. A suggested solution for precise vertical movement is using an optical stage with a screw-jack mechanism, known for its accuracy. Maintaining a gap of 0.8mm to 0.9mm and ensuring parallelism within microns are critical challenges. Additional input from experts in the forum may provide further insights and solutions. Precision in movement and alignment is essential for the successful operation of the rheometer.
harshith
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hi
i am going to design a parallel plate rheometer as a part of my project.in parallel plate rheometer, the fluid is sandwitched between the plates and rotation is given to the top plate.top plate is made with shaft, rotation is provided to the shaft by servomotor and for placing the fluid and removing the fluid,the top plate has to move up and down.here my problem is how to move the plate up and down , how to maintain the gap (0.8mm ,0.9mm)precisely and how to maintain parallelism of two plates with in microns.
please help me in this.very urgent.
 
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Welcome to PF, Hargarbageh.
My first thought in this matter would be an optical stage as used in holography. The drive is usually by a screw-jack mechanism, and can be incredibly precise. I'm afraid that I don't know enough to give you more information. I'm sure that others here can, though.
 

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