Category Archives: Measurements and Controls

Vision Gauge Digital Optical Comparator | Optical Comparator Measurement | Digital Optical Comparator Machine

01-horizontal vision gauge digital optical comparator-horizontal standard type-optical measuring system-DC 3000 data processing system

The Vision Gauge Digital Optical Comparator is "The Fastest, Easiest, Most Accurate Way to Compare a Part to a CAD File. Vision Gauge Digital Optical Comparators are very robust. They are perfect for both the shop floor and the Quality Control lab. Standard 12" travel X-axis stage with 0.5 micron resolution encoder and protective bellows around the 6" travel Y-axis column. All 3 axes (X, Y and Z) have high-accuracy crossed roller movements for optimal linearity and positional repeatability and high load carrying capability. Hard chrome plated X-axis stage, made of hardened tooling steel and with dual industry-standard dovetail grooves for easy part fixturing.

02-vertical vision gauge digital optical comparator-vertical standard type-optical measuring machine-optical comparator

Vision Gauge Digital Optical Comparators are complete, ready-to-run Windows-based solutions and  are  delivered network-ready. They are available in both horizontal and vertical configurations. They have industry standard dovetail mounting grooves for easy part fixturing.

Vision Gauge Digital Optical  Comparators are available  with transmitted (i.e. back) and / or reflected (i.e. front) illumination.  All  illumination  is  LED-based for very stable and repeatable illumination  conditions  over  a  very  long  life  (no  more  bulbs  to replace!). Furthermore, the illumination is programmable and computer-controlled. Everything is done through a single simple an d intuitive software interface.

01-vice with angle-accessories for digital optical comparator

Vision Gauge Digital Optical  Comparators have power focus. They are available in industry standard 5X, 10X, 20X,  50X  and 100X  optical configurations.  They are available in both single and multi-mag configurations.

01-rotary table-accessories for digital optical comparator

Vision Gauge Digital Optical Comparators and extremely easy to use. They are a "drop in" replacement for traditional optical comparators. An optional high-resolution LASER module is also available for depth & height measurements. Motorized fixtures and extended travels are also available.

Benefits:

  • Produce a very high contrast image with very sharp edge profiles so that there is no problem viewing it in full daylight.
  • Are much more accurate
  • Allow the user to be much more productive and get more work done with a single machine
  • Have "Auto Pass / Fail"
  • Can compute and display the part’s deviation from nominal and compare it to bi-directional tolerances
  • Work directly with the CAD data so that no overlays / templates / Mylars are required
  • Can be used to collect images (either with or without the CAD data overlay and with or without annotations), measurements and data .
  • Can also carry out fully automated measurements (like a video CMM)
  • Have a smaller footprint and use less floor space
  • Can be moved much more easily and without requiring re-calibration (i.e. “rolling cart” configuration is standard)
  • Have a much greater optical depth of field, i.e. “everything is in focus all at once”
  • Have a longer optical working distance ( i.e. more clearance between the part and the lens)
  • Allow you to compare a part to its CAD data beyond the optical field-of-view ! (because the CAD data tracks the part and follows the stage motion )
  • Have LED illumination for very stable illumination over a 10 year life. No more bulbs to change

01-vertical beam optical comparator-vertical vision gauge digital optical comparator-horizontal standard type-optical measuring system-DC 3000 data processing system

Originally posted 2011-04-21 23:20:59.

Terms in Engineering Measurements

Calibration:

01-the weighing scale-weighing machines-balance-calibration example

If a known input is given to the measurement system the output deviates from the given input, the corrections are made in the instrument and then the output is measured. This process is called “Calibration”.

Sensitivity:

Sensitivity is the ratio of change in the output signal to the change in the input signal.

Readability:

01-electroniccaliper-VERNIER CALIPER-DIGITAL VERNIER CALIPER-DIRECT MEASUREMENTS-ACCURATE-PRECISION MEASUREMENTS-CALIBRATED INSTRUMENTS-readability

Refers to the ease with which the readings of a measuring instrument can be read.

True size:

Theoretical size of a dimension which is free from errors.

Actual size:

Size obtained through measurement with permissible error.

01-true size-actual size-feet size-example-shoe-footwear

Hysteresis:

All the energy put into the stressed component when loaded is not recovered upon unloading. so the output of measurement partially depends on input called Hysteresis.

01-tachometer-digital tachometer-hysteresis due to pressure of force

Range:

The physical variables that are measured between two values. One is the higher calibration value Hc and the other is Lower value Lc.

01-range - read values from 0 to 11000 rpm - bezel meter - tachometer

Span:

The algebraic difference between higher calibration values to lower calibration values.

Resolution:

The minimum value of the input signal is required to cause an appreciable change in the output known as resolution.

Dead Zone:

It is the largest change in the physical variable to which the measuring instrument does not respond.

Threshold:

The minimum value of input signal that is required to make a change or start from zero.

01-threshold-minimum input given to start the engine-bike kick start action

Backlash:

The maximum distance through which one part of the instrument is moved without disturbing the other part.

01-backlash - continuous rotation possible without applying brake-SINGLE 3-PHASE AC ASYNCHRONOUS ELECTRIC MOTOR

Response Time:

The time at which the instrument begins its response for a change in the measured quantity.

Repeatability:

The ability of the measuring instrument to repeat the same results during the act measurements for the same quantity is known as repeatability.

Bias:

It is a characteristic of a measure or measuring instruments to give indications of the value of a measured quantity for which the average value differs from true value.

Magnification:

It means the magnitude of output signal of measuring instrument many times increases to make it more readable.

01-magnification-objective lens-magnify-loupe-ring

Drift:

If an instrument does not reproduce the same reading at different times of measurement for the same input signal, it is said to be measurement drift.

Reproducibility:

It is the consistency of pattern of variation in measurement. When individual measurements are carried out the closeness of the agreement between the results of measurements of the same quantity.

Uncertainty:

The range about the measured value within the true value of the measured quantity is likely to lie at the stated level of confidence.

Traceability:

It is nothing establishing a calibration by step by step comparison with better standards.

01-traceability-calibration step by step-vacuum calibration

Parallax:

An apparent change in the position of the index relative is to the scale marks.

01-parallax-error-measurement of length-eye view

Originally posted 2011-02-05 00:03:29.