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Abstract:
This video features Nai presenting a vintage Zeiss Universal Measuring Microscope from the 1930s, a significant piece of metrology history acquired from the University of Ghent. The massive instrument (450-500 kg) rests on its original oak table and functions as a 2D measuring machine. It utilizes a main microscope for viewing the part and separate microscopes to read high-precision glass scales for X and Y measurements, capable of resolving microns. Nai demonstrates its functionality by manually measuring a 20mm ring gauge, detailing the meticulous process of finding edges, taking readings, and calculating the diameter, achieving a result close to nominal. The video highlights the microscope's advanced (for its time) design featuring separated X and Y axes to minimize error propagation, a principle revisited in modern Zeiss O-Inspect machines. Its original capabilities included measuring complex features like screw threads using a tilting head. The segment contrasts the historical manual measurement techniques with the speed of modern CMMs.
Exploring a 1930s Zeiss Universal Measuring Microscope
0:00:05 Introduction: Jay visits Nai in the Netherlands to see a special piece of equipment.
0:00:28 The Machine: Nai introduces a Zeiss Universal Measuring Microscope dating back to the 1930s.
0:00:39 Acquisition Story: Nai acquired the microscope from the University of Ghent in Belgium seven years after initially seeing it and expressing interest.
0:01:43 Physical Characteristics: The main unit weighs 450-500 kg (approx. 1000 lbs) and comes with its original, heavy-duty oak table.
0:02:13 Basic Function: It's described as a measuring machine with a microscope, featuring three underside lights for part illumination.
0:02:51 Measurement Principle: It operates as a 2D measuring machine with X and Y slides. Measurements are taken by viewing glass scales through dedicated X and Y microscopes.
0:03:18 High Precision: The scales allow measurements down to thousandths of a millimeter (microns) and even subdivisions of microns.
0:03:51 Operational Status: The nearly century-old machine is still functional and is powered up for a demonstration.
0:04:02 Measurement Demonstration: Nai demonstrates measuring the diameter of a 20mm ring gauge, starting by finding the Y-axis center line (measuring 12 o'clock and 6 o'clock positions).
0:04:48 Advanced Design Principle: The microscope features separated X and Y axes, meaning the guideways are independent, preventing errors from one axis propagating to the next. This contrasts with common stacked-axis CMM designs but is similar to the modern Zeiss O-Inspect.
0:06:03 Manual Reading Process: The process involves focusing the main microscope on the part feature, then moving to the scale microscopes to read the numerical position, requiring manual recording.
0:07:23 Calculation & Result: After taking readings for the 12, 6, 9, and 3 o'clock positions and performing calculations, the measured diameter is determined to be 20.003 mm (3 microns over nominal).
0:08:26 Original Capabilities: The machine was designed with accessories to measure complex geometries like screw threads, including pitch and flank angle, facilitated by a tilting head mechanism.
0:09:13 Historical Context: The demonstration highlights the time-consuming nature of manual precision measurement in the past compared to modern CMMs (which might take ~30 seconds for a similar task).