Measuring Laser Drilled Hole Diameter in Ceramic Specimens

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Discussion Overview

The discussion centers around methods for measuring the diameter of laser-drilled holes in ceramic specimens, focusing on the challenges posed by irregular hole shapes and the required measurement accuracy. Participants explore various techniques and instruments suitable for this task.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant suggests using metrology equipment from Lenox Laser for analysis, while also mentioning that some scopes can measure with a precision of +/- 5 millionths of an inch.
  • Another participant inquires about the specific diameter and accuracy required for measurement, offering their experience in selling Metrology Instruments since 1980.
  • A method involving shining light through the hole and measuring the radius of its shadow is proposed as a potential measurement technique.
  • One participant notes that measuring an irregular hole's diameter is challenging and outlines four common methods: Maximum Inscribe Circle (MIS), Minimum Circumscribed Circle (MCC), Least Squares method (LS), and Zone or Minimal Radial Separation (MRS).
  • Another participant expresses interest in the types of instruments that can be used for measurement.
  • Recommendations for using measuring microscopes or optical comparators are provided, along with links to specific models.
  • A participant mentions using a toolmaker's microscope and seeks advice on how many measurements would be sufficient for an irregular hole.
  • It is noted that the number and type of measurements depend on the specifications or functions of the hole.
  • A separate inquiry about measuring the heat-affected zone of laser-drilled specimens is raised, indicating a related but distinct concern.

Areas of Agreement / Disagreement

Participants express various methods and instruments for measuring the hole diameter, but there is no consensus on a single best approach, particularly due to the irregularity of the holes and differing accuracy requirements.

Contextual Notes

Participants have not fully defined the assumptions regarding measurement accuracy or the specific characteristics of the irregular holes, which may affect the choice of measurement method.

Who May Find This Useful

This discussion may be useful for professionals and researchers involved in materials science, metrology, and engineering applications where precise measurements of small, irregular features are required.

bhartish
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I have laser drilled hole thin ceramic specimens and I am required to measure the diameter of the holes. Suggest me some methods.
 
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Lenox Laser does this kind of work. You may wish to have them perform an analysis using their metrology equipment. Otherwise, some scopes with precision stages will tell you down to about +/- 5 millionths of an inch.
 
what diameter hole and to what accuracy do you wish to measure?
i have been selling Metrology Instruments since 1980 and can provide some small input to your requirement
 
shine a light through it, measure the radius of its shadow, and correct for the distance?
 
"what diameter hole and to what accuracy do you wish to measure?
i have been selling Metrology Instruments since 1980 and can provide some small input to your requirement"

its approximately 2mm. I am checking for the repeatability of the experiment. But the shape is irregular.
 
"Lenox Laser does this kind of work. You may wish to have them perform an analysis using their metrology equipment. Otherwise, some scopes with precision stages will tell you down to about +/- 5 millionths of an inch."


Can I get some elaboration on this ?
 
if the diameter is not round then a diametric measurement is not easy.

there are four most common methods to calculate a diameter.

Maximum Inscribe circle (MIS), Minimum circumscribed circle (MCC), Least Squares method (LS)
and Zone or Minimal Radial Separation (MRS) which uses the MIS and MCC method
to what tolerance do you need to measure?

your desired measurement accuracy will determine the measurement method
 
I am actually looking into the instruments which I can use.
 
Any type of decent measuring microscope or optical comparator should work fine, something like these : http://www.mitutoyo.com/TerminalMerchandisingGroup.aspx?group=1410 or http://www.mitutoyo.com/TerminalMerchandisingGroup.aspx?group=1620
 
Last edited by a moderator:
  • #10
Yes fine I am using Tool makers microscope. But I want to know , for an irregular hole , how many measurements would be appreciable?.
 
  • #11
The number/type of measurments depends on the specification or function of the hole.
 
  • #12


I have laser hole (1mm-2mm dia) drilled specimens . How to measure heat affected zone ?
 

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