Re: [CAD_CAM_EDM_DRO] Re: rant

Could I suggest 508nm? That is a multiple of 2.54 and
would allow for easy imperial to metric conversion.

I wanted to get that in before we were banned!
Pete.

----- Original Message -----
From: turbulatordude
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Sunday, April 06, 2008 2:09 PM
Subject: [CAD_CAM_EDM_DRO] Re: rant


I fear this thread will be banned sooner than later, but I think that
using the yellow band has inherent difficulties. one is that the
blueprint would not reflect the color properly,
second, since low presure sodium lamps are between 570 and 589 nm,
there is no good reference standard.

I propose using a blue-green wavelength as it will copy on a copy
machine (yellow will not) and it is near the 500mn or rounded number
that makes measuring easier.

I also propose not going with the longer orange side of the spectrum
as that is getting further away from the problem.

If we use SI and inch, why not just change the mm to be 0.040 inches ?
and be done with it ?

Dave