You might want to look at http://www.buildlog.net/forum/viewtopic.php?f=16&t=557&start=60
it is based on graster http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Rastering_With_A_Laser sam On 11/16/2012 07:59 AM, Eric H. Johnson wrote: > Jeshua, > > There are advantages to using the Z axis for controlling a laser, but they > come with some problems. Among the advantages are coordinating the laser > power with the motion of the other axes, lack of stutter as occurs when > adjusting laser power when it is tied to the spindle, the ability to draw > the desired image in 3D and get a representative, if not strictly accurate > rendering / engraving of that image, particularly in rastering type > applications, etc. > > If you do not need to vary the laser power very often or very quickly, you > might be better off tying it to the spindle. Since it is an axis, kinematics > is still going to apply to that axis, thus to change it as quickly as > possible you will want to use a very small range for the Z value (0.0-0.1 > in/mm or smaller) and then scale up to the values required by the DAC. > > Additionally you need to be very careful with the use of offsets like G92 > commands or you may end up at a different laser power than you thought, or > even have the laser come on when you thought it should be off in the case of > using 0.0 for laser off when toggling the shutter is too slow. > > There are several articles in the Wiki on the use of lasers with lcnc. > > Configuration is pretty straight forward, just tie the Z value to the DAC > using the built in scale parameter if available, or use a scale component if > it is not. > > Regards, > Eric > > > Greetings, > > I was thinking of controlling my CO2 laser intensity using the Z value in > the G-Code. > > Maybe I could use 0-1 for 0% to 100% percent, or perhaps 0-255. > > I have a Pico Systems DAC board that outputs 0-5 volts that in turn will > control the laser power from 0 to 100%. > > Can anyone suggest how I could configure LinuxCNC to control the DAC from Z > values? > > Or can anyone suggest if there might be a better way to do it? > > > ------------------------------------------------------------------------------ > Monitor your physical, virtual and cloud infrastructure from a single > web console. Get in-depth insight into apps, servers, databases, vmware, > SAP, cloud infrastructure, etc. Download 30-day Free Trial. > Pricing starts from $795 for 25 servers or applications! > http://p.sf.net/sfu/zoho_dev2dev_nov > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
