Optical Comparator measuring of Position of a Threaded Hole

T

tonya07

#1
I would be interested in getting your advice on how to explain to our customer the proper way to measure the position of the threaded hole on the Optical Comparator. We currently use the Go end of the threaded plug gage. Zero on the gage, move to the top of the part and take dimension, move to the bottom of the part and take dimension. Find the difference in both dimensions and divide by 2. I understand that if you do not divide by 2 you get the total deviation across the diameter but we really want to know the deviation (offset) from center on the radius.
Is this correct?? If so, can you help me better explain to my customer why we divide by 2? They are not understanding our reasoning.
Our customer only finds the difference between both dimensions (they do not divide by 2).


Thank you for your assistance!
 
Elsmar Forum Sponsor

Michael_M

Trusted Information Resource
#2
Re: Optical Comparator measuring of Position

If you are looking for true position the formula is actually:

(A squared) + (B squared) = (C squared) as an example:

deviation of "X" dimension is .0025 and after squaring it you get .00000625

Deviation of "Y" dimension is .0012 and after squaring it you get .00000144

Adding the two dimensions together you get .00000769 which you then take the square root of and get .002773085.

This number is doubled as the calculation gives you radius and we need diameter. So the final true position is .00554617.


The optical competitor can give you the deviation of X and Y which you look like you got.

[Added in Edit] If you are only looking for a single direction check, you do not divide by 2 as you are looking for the diameter of the deviation, not the radius. The description you are showing would be correct without the dividing by 2.
 
Last edited:
Thread starter Similar threads Forum Replies Date
Q NADCAP NDT (specifically RT) - Calibration of eye loupe reticle & optical comparator AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 1
J TOPCON PP-70 Optical Comparator - User Manual Needed General Measurement Device and Calibration Topics 0
G Optical Comparator Light Bulb Wear question General Measurement Device and Calibration Topics 1
D Using a "broken" measurement device in a TS 16949 company - Optical comparator IATF 16949 - Automotive Quality Systems Standard 4
C Optical Comparator Uncertainty Budget Measurement Uncertainty (MU) 2
A Best Way for SPC via Optical Comparator with output to Computer for Data Analysis Statistical Analysis Tools, Techniques and SPC 4
S Calculating an Uncertainty Budget for an Optical Comparator General Measurement Device and Calibration Topics 4
J How to measure the True Position on an Optical Comparator Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
J Checking the Theoretical Sharp of a Flush Head Bolt on an Optical Comparator Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
S GR&R (Gage R&R) for an Optical Comparator or Vision System Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
F How to inspect the 5 different dimensions using an optical comparator Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
ScottK Moving an optical comparator - recalibration needed? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
Q What is the best optical comparator? General Measurement Device and Calibration Topics 14
D Calibration of Optical Comparator Overlays - Radius, Thread and Angle General Measurement Device and Calibration Topics 11
M How can I evaluate/measure backlash on an optical comparator General Measurement Device and Calibration Topics 1
M Measurement Uncertainty in Optical Microscopy Measurement Uncertainty (MU) 1
optomist1 Best Optical Comparators General Measurement Device and Calibration Topics 9
P Need a programmer for QVI's VMS software for optical inspection machine Inspection, Prints (Drawings), Testing, Sampling and Related Topics 0
S Is Optical Parallel Set required calibration? ISO 17025 related Discussions 1
S Optical coherence tomography (OCT) device - Do we need to apply IDE? Other US Medical Device Regulations 0
G How to compute or estimate a micrometer or caliper flatness using optical flat General Measurement Device and Calibration Topics 2
rob73 Advice/recommendations for equipment to measure a soft pvc tube - Optical Measuring? General Measurement Device and Calibration Topics 4
C Uncertainty Estimation for Spark Optical Emission Device Measurement Uncertainty (MU) 1
Marc Mind-bending optical illusion paintings Coffee Break and Water Cooler Discussions 3
M Basic International Standards required for a Manufacturing Industry (Optical Media) Other ISO and International Standards and European Regulations 4
S How to calibrate AOI (Automated Optical Inspection) for IOPQ Qualification and Validation (including 21 CFR Part 11) 3
M Typical values of MTBF for Optical Avionic Networks Reliability Analysis - Predictions, Testing and Standards 1
F Optical Gaging Systems - Shadows, debris, etc. cause parts to measure out of spec Measurement Uncertainty (MU) 7
R Optical Emission Spectrometer Calibration General Measurement Device and Calibration Topics 0
3 Vision System Optical Calibration Standard General Measurement Device and Calibration Topics 6
B Optical Steel Surface Inspection System (best hardware to recommend) Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
T Optical Emission Spectrometer Calibration to a National or International Standard Various Other Specifications, Standards, and related Requirements 4
J Uncertainty Budget for the Optical Microscope - Deriving Linearity Uncertainty Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
J MU (Measurement Uncertainty) for an Optical Microscope Measurement Uncertainty (MU) 7
M Methods for Verification/Calibration of Video (Optical) Extensometer General Measurement Device and Calibration Topics 2
A Optical Magnification Checking Graticule - Starrett 400-360 (P-10089) General Measurement Device and Calibration Topics 2
somashekar Optical epoxy for LED having good thermal shock resistance. Manufacturing and Related Processes 2
Q Validating the AOI process (Automated Optical Inspection) Reliability Analysis - Predictions, Testing and Standards 9
Q PCBA Visual Inspection Tools & Methods - discounting Optical Tools Manufacturing and Related Processes 11
M Serial Numbers for Product - Common sense? Optical Components for Telecommunications Manufacturing and Related Processes 9
Marc Email in the 18th Century - The Optical Telegraph After Work and Weekend Discussion Topics 0
K GR&R for an Automatic Optical Inspection Machine (AOI) Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
Jim Wynne Checker Square Optical Illusion Coffee Break and Water Cooler Discussions 14
samer Some Optical Illusion Examples Coffee Break and Water Cooler Discussions 6
B Can I calibrate Optical Comparators internally? General Measurement Device and Calibration Topics 24
ScottK Automating variable inspection - Calipers, micrometers, and optical comparators Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
H Attribute Gage R&R for Repair Station Operators - AOI (Automated Optical Inspection) Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
M How to use FC-30 optical compartor? General Measurement Device and Calibration Topics 6
N Ocr (OPTICAL CHARACTER RECOGNITION) Scanners Quality Assurance and Compliance Software Tools and Solutions 4
D Optical flats - "FLATNESS INTERPRETATION CHART, Light Wave Band Pattern Guide" General Measurement Device and Calibration Topics 4

Similar threads

Top Bottom