I discovered PCB etching is as good as the mask and an ordinary laser printer is not very good.
As I understand it a DLP with UV light is very good and could "print" the pattern with UV light directly onto the PCB. > The typical photoresists used for PCB's are sensitive from UV up to > ~400nm. A bit too low for an LCD since most of the light used behind the > LCD mask will be absorbed by the LCD. > > You can use a DLP projector with those photoresists. They work even > better with the color wheels removed, but it does shorten the life of > the DLP. > > Another option is using photoresists that cure in the visible spectrum > >400nm with an LCD or DLP projector. > > DLP projectors are even used with inverse microscopes for lithography > down to ~1um features. > https://gmwgroup.harvard.edu/pubs/pdf/757.pdf > > -Bari > > On 07/24/2018 09:25 PM, Przemek Klosowski wrote: > > I always wondered if a small LCD projector would be enough to expose a > > typical photosensitive PCB--they can be had for not much more than $100, > > and are surprisingly bright at small distance (of course they aren't worth > > much for what they are solf for, displaying onto large walls:) > > If that worked, it would be easy and fast (no scanning, just project your > > gerbers) > > > > On Tue, Jul 24, 2018 at 10:07 PM John Dammeyer <[email protected]> > > wrote: > > > >> I like the idea of using a small laser for exposing the PCB. I already > >> have > >> a CNC router with roller skate bearings (it doesn't yet use the linear > >> bearings and rails I bought to upgrade it). Might be nicer than milling > >> the > >> PCB although still need to drill holes too. > >> > >> John > >> > >> > >>> -----Original Message----- > >>> From: Dan Bloomquist [mailto:[email protected]] > >>> Sent: July-24-18 6:53 PM > >>> To: Enhanced Machine Controller (EMC) > >>> Subject: [Emc-users] Fwd: Re: CAD for LinuxCNC > >>> > >>> > >>> > >>> John Dammeyer wrote: > >>>>> I've been using Fusion 360 for a few years now. The license is > >>>>> $300/year. They have a post processor for linuxcnc so the CAM directly > >>>>> generates g-code that I can take out to the machine. As an example, I > >>>>> had to cut a couple of these from 303: > >>>>> <http://lakeweb.net/CNC/images/200-024.png> > >>>> Hi Dan, > >>>> Sweet. Are you running a MAC or PC with windows for Fusion? > >>>> John > >>> Hi John, > >>> Thanks. This is my wife's and my business. > >>> <https://reserveanalyst.com/> > >>> > >>> My desk machine, where Fusion lives, is windows 7. Linux is on my mill > >>> and I have a couple of beaglebone blacks. > >>> > >>> But I have to use windows as it is my day job. As far as Apple goes, I > >>> was all about it back in the Apple I and II days. But they prioritized > >>> when they went to Mac, so I lost interest in Apple. Now that there is > >>> Linux, who needs apple :) > >>> > >>> Best, Dan. > >>> > >>> P.S. I like this: > >>> <https://github.com/hzeller/ldgraphy> > >>> I would build the machine differently. But great thing is, you can use > >>> the same machine to do a photo sensitive solder mask as a next step! > >>> > >>> > >>> > >> ---------------------------------------------------------------------------- > >> -- > >>> Check out the vibrant tech community on one of the world's most > >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot > >>> _______________________________________________ > >>> Emc-users mailing list > >>> [email protected] > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> > >> ------------------------------------------------------------------------------ > >> Check out the vibrant tech community on one of the world's most > >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > > ------------------------------------------------------------------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
