do you mind sharing the CNC program for the lenses? Id like to try it...
Semper Fidelis
I didn't do it in CNC (G-code).
I did the 3D renderings in DesignSpark Mechanical because I wanted to do this on the 3D printer. DesignSpark generates STL (3D), PDF, and Autocad DRW files. But the laser doesn't read 3D files. So, I select a 2D view and output a drawing file of that profile and save it.
The laser runs raster-based and vector-based programs. But all cutting requires vector-based programs. For example, you can do a graphic, but not cut using Photoshop, which is raster-based. So I have to import the drawing file into a program (Inkscape), often cleaning up superflous lines, and save the file as a SVG (vector) file.
The Corel Draw program drives the laser and can read the SVG file to cut the pattern once I import it, scale it, and position it.
Hmm... That doesn't look -at all- like my kenrick lenses. I'll check when I get home re thickness. Perhaps there was a redesign after the initial run. Not that it matters much, just curious.
So... different mfg runs on a design iteration, perhaps.
I know the reject rate on the initial run (warped plates) was high... (years ago!)
thicker plates may have been their solution.
Or..., maybe these aren't Kendrick, even those that's what the post said they were.
Ah. Those were the Image Communications product... Model L-10 or 11. Makes more sense now
On Kenrick's web page and on Ebay theirs have 11 plates:
". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers
Hi toddalin,
Yes, but not to forget that , the angle of ABOUT 38 deg has to be included, as 1/cos(38) = 1.269,
so if can be said that (1/16+4/16)*10*1.269 = 3.96", may be 1/16" thickness or 1/4 spacing is not
absolute precise but it is very near the JBL 2308 lenses size.
If You want to be more precise, may be the thickness can be reduced from 1/16" to 1/20"
then it can be get:
(11* 1/20 + 10* 1/4)*1.269 = 3.87"
regards
ivica
Makes sense.
I guess when one consideres the angle, that my spacing is actually closer together than I thought it was. I figured at ~0.35" vertical spacing (with 1/16" plates) it is good to beyond 19kHz but tighter spacing takes it out past 20kHZ, as if an 075 could go that high.
Those came from the Sign-Shop on Ebay. Expensive but the only source I know of.
There is a pair of originals for $250 on the bay.
There are currently 1 users browsing this thread. (0 members and 1 guests)