Contact US

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!

*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

Glare Reduction

Glare Reduction

Glare Reduction

Does anyone have any experience with glare reduction inside a bore? Specifically we are looking to machine internal threads into an aluminum bore (black anodized finish)and plan to machine AR threads. Can anyone suggest a thread form to use, thread angle, pitch??

RE: Glare Reduction


   I specify a surface finish of 500/250 microinches (12/6 microns).  Who cares what the thread profile is.  

   If you do not have a surface roughness gauge, get one.  Maybe, you want to go rougher.



RE: Glare Reduction

I typically use a pitch of 0.5mm.

I've also played with some different profiles but once you go away from a standard shape you might as well make them circular grooves instead of a helical. In that particular case it worked really well but if you want to go this route you'll need a non-sequential optics program to play with the shapes and see the effectiveness.

Bead blasting the surface has worked in the past but you need to be careful because that may create a lot of 'glare spots'. I normally try to avoid that but it's worked before.


RE: Glare Reduction

Thank you for the feedback. For the first article I've specified a .5mm pitch and we'll see how it turns out. The optical black finish looks very interesting and I'll keep it in mind for future applciations. This one, however, is medical, and if we change any materials we will have to do disinfection and sterilization validations.  

RE: Glare Reduction

Update: Prototype units with a 0.5mm thread pitch and sharp pointed thread crests came out very well. Significant glare reduction from the non-threaded model.  

RE: Glare Reduction

Glare reduction from edges is actually quite non-trivial.  If you are particularly sensitive to it, you might need to do some thorough testing by varying the angle of the detector and source relative to the threads.  With high-intensity source at low grazing angles relative to the threads, you might still get glints from the edges of the threads.


FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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