Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Visual Go/No Go Gages

Visual Go/No Go Gages

Visual Go/No Go Gages

Does anyone know of a standard or a best practice for tolerancing a visual gage.  The gage is used in conjuction with an individuals sight to determine pass or fail condition.  Even assuming perfect eyesight can you actually differentiate between 0.1mm, 0.01mm, 0.001mm, and 0.0001mm.

What can the human eye actually see accurately?

We would like to correctly tolerance these sight gages on their prints, keeping a accuracy ratio of 10:1.  We don't want to over tolerance the gage and add additional cost to our process.

There has to be some type of standard or best practice for this type of measurement.

RE: Visual Go/No Go Gages

I assume you are using an optical reticle for inspection of the part.  Obviously the higher the magnification the higher the accuracy of the measurement.  You want to invest in a calibration block to verify your measuring accuracy.

Northern Gauge Sherwood Park Ab

RE: Visual Go/No Go Gages

I am using a visual gage.  We hold it up to the part and it either passes or fails this gage.  Totally visual.  No dimensions taken.

My question is how do I determine the accuracy of the eye.  What error am I introducing into my measurement using these devices.  They are adequate, but adequate is the question.

RE: Visual Go/No Go Gages

This is the job of the calibration.  You should get some samples with known dimensions and run a multiple trial, multiple person test and see where they fall.

Hypothetically, the accuracy of the gage is essentially the line width of the reticle marking, but eye-relief and other factors could change that.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - The Criticality of the E/E Architecture
Modern vehicles are highly sophisticated systems incorporating electrical, electronic, software and mechanical components. Mechanical systems are giving way to advanced software and electronic devices, driving automakers to innovate and differentiate their vehicles via the electric and electronic (E/E) architecture. As the pace of change accelerates, automotive companies need to evolve their development processes to deliver and maximize the value of these architectures. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
Modern cars, trucks, and other vehicles feature an ever-increasing number of sophisticated electrical and electronic features, placing a larger burden on the wiring harness that enables these new features. As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - Modeling and Optimizing Wire Harness Costs for Variation Complexity
This paper will focus on the quantification of the complexity related costs in harness variations in order to model them, allowing automated algorithms to optimize for these costs. A number of real world examples will be provided as well. Since no two businesses are alike, it is the aim of this paper to provide the foundational knowledge and methodology so the reader can assess their own business to model how variation complexity costs affect their business. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close