<img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=345831125832216&amp;ev=PageView&amp;noscript=1">

ISO 17025 accredited

Optical Comparator Calibration

 

 

Request A Quote

Capabilities:

Magnification- 5x to 100x

Linearity- 0 to 6 in

Squareness 0 to 6 in

Standards Followed:

  • GIDEP P108
  • GIDEP T.O. 33K6-4-1392-1
  • Manufacturers Specifications
  • Customer Specifications

Brands we calibrate:

  • Mitutoyo
  • OGP
  • Deltronic
  • Starrett
  • Gagemaster
  • J&L
  • Fowler
  • Suburban Tool
  • SPI
  • Micro-Vu
  • Kodak
  • Nikon
  • Jones & Lambson
  • S-T Industries
  • Certified Comparator Products
  • and more.....

    Check out our Dimensional Calibration Page for more capabilities.

Optical_Comparators_large

The History of The Optical Comparator

"An optical comparator (often called just a comparator in context) is a device that applies the principles of optics to the inspection of manufactured parts. In a comparator, the magnified silhouette of a part is projected upon the screen, and the dimensions and geometry of the part are measured against prescribed limits. The measuring happens in any of several ways. The simplest way is that graduations on the screen, being superimposed over the silhouette, allow the viewer to measure as if a clear ruler were laid over the image. Another way is that various points on the silhouette are lined up with the reticle at the centerpoint of the screen, one after another, by moving the stage on which the part sits, and a digital readout reports how far the stage moved to reach those points. Finally, the most technologically advanced methods involve software that analyzes the image and reports measurements. The first two methods are the most common; the third is newer and not as widespread, but its adoption is ongoing in the digital era.

The first commercial comparator was developed by James Hartness and Russell W. Porter.[2] Hartness' long-continuing work as the Chairman of the U.S.'s National Screw-Thread Commission led him to apply his familiarity with optics (from his avocations of astronomy and telescope-building) to the problem of screw thread inspection. The Hartness Screw-Thread Comparator was for many years a profitable product for the Jones and Lamson Machine Company, of which he was president.

In subsequent decades optical comparators have been made by many companies and have been applied to the inspection of many kinds of parts. Today they may be found in many machine shops.[3]

The idea of mixing optics and measurement, and the use of the term comparator for metrological equipment, had existed in other forms prior to Hartness's work; but they had remained in realms of pure science (such as telescopy and microscopy) and highly specialized applied science (such as comparing master measuring standards). Hartness's comparator, intended for the routine inspection of machined parts, was a natural next step in the era during which applied science became widely integrated into industrial production."

Source: https://en.wikipedia.org/wiki/Optical_comparator

Frequently Asked Questions

Gage ID Number

Description and Size of Gage

Calibration Cycle

Check Points (if not specified, we adhere to our quality policy)

Gage ID is the unique identifier you use to identify the specific piece of equipment.

Calibration Cycle is the interval between calibrations.

 We use this information to provide a sticker for the calibrated instrument to show when it was calibrated and when you want it calibrated again.

 

 

 

 

YES!

Please include power cords, leads, and any accessories necessary for us to perform the calibration.

 

 

All ISO 17025 accredited calibrations are traceable through NIST or another NMI(National Metrology Institute) to the SI Unit. 

Calibration certificates include as-found data, as-left data, and measurement uncertainty.

Alliance Calibration

11402 Reading Road

Cincinnati, OH 45241

We do offer onsite calibration service within a 150-mile radius. Not all calibrations are best suited for onsite calibration.

Please contact Customer Service with your specific question.

The minimum order is $35.

No.

    Still, Have Questions?

        Request A Quote

        You Might Want To Read.......

        Don't clean your measurement & test equipment!

                The COVID-19 pandemic has brought cleaning to the forefront for many manufacturers. Specifically, sanitizing measurement & test equipment.

        April 23, 2020

        NIST Numbers: Your Auditor Is Wrong.

        I thought the topic of NIST numbers had been resolved when we published What you need to know about NIST numbers.

        January 1, 2020

        ISO 9001 or ISO 17025: How to choose a calibration company.

                ISO 17025 or ISO 9001: Which one is better? As a calibration company we are sometimes asked which is better ISO 9001 or ISO 17025 certification. That really is the wrong question.  Both of..

        December 27, 2019

        Out of Tolerance or Meets Specifications?

          When measurement and test equipment are sent out for calibration most customers of calibration want a statement of compliance.

        November 13, 2019