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Glare Reduction

Glare Reduction

Glare Reduction

(OP)
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

alperin,

   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.

    

               JHG

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.

HTH,
Dan

RE: Glare Reduction

(OP)
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

(OP)
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.

TTFN

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