Fwd: [CAD_CAM_EDM_DRO] Surface profilometry was Re: Open (i think) design for a parallel robot (reprap ma
Posted by
jesse Brennan
on 2006-09-06 19:05:36 UTC
see:
http://www.tdx.cesca.es/TESIS_UPC/AVAILABLE/
TDX-1117103-094015//03CHAPTER2.pdf#search=%22surface%20%20profilometry
%22
This will give you state of the art techniques. Traditionally this
was a purely mechanical process but has been augmented by
developments in optical intereometry . I first saw these and used
some about 15 years ago. I have been retired long enough to be really
out of touch with all the new stuff since the original patents will
have expired.
jesse
Begin forwarded message:
From: "gran3d" <lwgran@...>
Date: September 6, 2006 5:30:04 PM CDT
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Open (i think) design for a parallel
robot (reprap ma
Reply-To: CAD_CAM_EDM_DRO@yahoogroups.com
--- In CAD_CAM_EDM_DRO@yahoogroups.com, Carl Mikkelsen
<c.mikkelsen@...> wrote:
small angle, say 5 to 10 degrees. Then take a digital picture. Then
measure the amount of high frequency component in the photograph
(using a 2-d fast fourier transform). It requires some complex
software, but the gadgets are pretty cheap.
The notion is that the rougher the surface, the more dark-light
jitter, so the more high-frequency components.
[Non-text portions of this message have been removed]
http://www.tdx.cesca.es/TESIS_UPC/AVAILABLE/
TDX-1117103-094015//03CHAPTER2.pdf#search=%22surface%20%20profilometry
%22
This will give you state of the art techniques. Traditionally this
was a purely mechanical process but has been augmented by
developments in optical intereometry . I first saw these and used
some about 15 years ago. I have been retired long enough to be really
out of touch with all the new stuff since the original patents will
have expired.
jesse
Begin forwarded message:
From: "gran3d" <lwgran@...>
Date: September 6, 2006 5:30:04 PM CDT
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Open (i think) design for a parallel
robot (reprap ma
Reply-To: CAD_CAM_EDM_DRO@yahoogroups.com
--- In CAD_CAM_EDM_DRO@yahoogroups.com, Carl Mikkelsen
<c.mikkelsen@...> wrote:
>deviations from
>...
> What I was curious about is how to measure the small-scale
> the desired shape. Isn't this property called surface roughness?What is
> a simple way to measure surface roughness?A weird thought, entirely unproven, is to light the surface from a
>
small angle, say 5 to 10 degrees. Then take a digital picture. Then
measure the amount of high frequency component in the photograph
(using a 2-d fast fourier transform). It requires some complex
software, but the gadgets are pretty cheap.
The notion is that the rougher the surface, the more dark-light
jitter, so the more high-frequency components.
[Non-text portions of this message have been removed]