Gas pressure effect on lens to affect focus
Gas pressure effect on lens to affect focus
(OP)
Just food for thought -
Has anyone tested or run the numbers to see how far a lens might deflect under high gas pressure?
And, how far would that deflection move the focus point?
I wonder if that would help explain some of the rules of thumb regarding focus height when cutting various materials.
Seems like most materials that 'want' a low focus are also being cut at high pressure.
Obviously, lens diameter and thickness would affect the focus change at a given pressure.
Regards
Jay
Has anyone tested or run the numbers to see how far a lens might deflect under high gas pressure?
And, how far would that deflection move the focus point?
I wonder if that would help explain some of the rules of thumb regarding focus height when cutting various materials.
Seems like most materials that 'want' a low focus are also being cut at high pressure.
Obviously, lens diameter and thickness would affect the focus change at a given pressure.
Regards
Jay
Jay Maechtlen
http://www.laserpubs.com/techcomm





RE: Gas pressure effect on lens to affect focus
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RE: Gas pressure effect on lens to affect focus
When using Nitrogen, you're typically cutting at 2-6 bar, maybe more.
That's the static pressure in that chamber while cutting, and that's what the lens sees.
The other side of the lens is at atmospheric.
Ok, I know some systems use a window to protect the lens - depending on the design the window may or may not seal the pressure and protect the lens from it too?
Jay Maechtlen
http://www.laserpubs.com/techcomm
RE: Gas pressure effect on lens to affect focus
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
RE: Gas pressure effect on lens to affect focus
I hope this helps.
RE: Gas pressure effect on lens to affect focus