Long thread but Ben created a Hal component to do rastering with the printer port.
http://www.buildlog.net/forum/viewtopic.php?f=16&t=557 Sam On Sat, 30 Apr 2016 13:39:57 +0100 Sarah Armstrong <sarahj.armstron...@gmail.com> wrote: > Linuxcnc works fine for Laser cutting , > > Laser rasterising is a totally different matter , and needs to be looked at > from a different perspective > it also depends on how your laserbeam is switched , and the modulation type > used . > their is some limited information regarding rasterising on the Wiki Pages . > > > > On 30 April 2016 at 13:22, Nicklas Karlsson <nicklas.karlsso...@gmail.com> > wrote: > > > If you have problem with PWM signal generation there are plenty of cheap > > micro controller development board available although protocols may be > > worse. I guess it could be an idea to search m-codes for "professional" > > laser cutters or maybe reuse codes usually used for spindle. > > > > 2016-04-30 3:48 GMT+02:00 Bruce Layne <linux...@thinkingdevices.com>: > > > > > I still haven't built my 3' X 5' 80W CNC laser, but it'll be controlled > > > by LinuxCNC when I do. I've had a big pile of laser parts for almost > > > three years. Maybe later this summer, if I finally find some mojo. > > > > > > LinuxCNC is better for cutting and embossing/engraving lines. LinuxCNC > > > is not good for raster laser engraving. Most of my laser jobs are > > > cutting and light scoring which are essentially vector jobs, but I do > > > have a few logos that are currently raster engraved on a friend's laser, > > > which is essentially operating as a Windows printer using a proprietary > > > printer driver, under CorelDraw. My logos are simple, made of solid > > > shapes, and I expect to render them as vector engravings by outputting > > > vector image files from Inkscape. That's the plan, anyway. If you want > > > to laser engrave photographs, you will probably need some way to raster > > > engrave. In that case, LinuxCNC may not be a good option for you. > > > > > > I've seen a few CNC lasers that used the -Z hack to turn the laser on, > > > and that does have a certain simplicity, but I think it's too kludgey > > > with too many tradeoffs and undesirable behaviors from the trajectory > > > planner. I plan on using M codes to turn the laser on and off. I also > > > plan on using the Z axis to drive stepper motors to jog the table > > > elevation when setting up a job at the correct height. In theory, I > > > could laser engrave 3D objects by using the Z axis as well, but I don't > > > plan on using any Z motion in my laser G code, other than maybe a fixed > > > Z offset at the beginning from the homed Z position is I decide to have > > > a hardware Z=0 with relative offsets from that for each job. I also > > > plan on a light duty 4th axis for laser cutting round objects. One of > > > my production jobs requires laser cutting and embossing cylindrical > > tubes. > > > > > > For reduced power settings, I'll pulse width modulate a signal to turn > > > the laser on and off fairly quickly. > > > > > > Many people would assume that it'd be easier and faster to draw > > > something in CorelDraw and "print" it on the laser, but I hate it, and > > > would much rather have direct control of the G code. The CorelDraw > > > print driver for the laser may be faster when making one or two of > > > something, but it gives me no control over the order in which features > > > are cut on the laser, which results in clumsy production jobs that are > > > difficult to run because the order of subsequent steps are random, and > > > there is a lot of wasted motion. I want the control that I get writing > > > G code by hand, in a logical progression. To some extent, this is an > > > extension of the lack of control I have in Windows, compared to Linux. > > > I think it's more of a philosophical difference than a technical > > > difference. > > > > > > Sorry, but I haven't implemented any of this LinuxCNC laser stuff yet, > > > so I have only this generic advice and no specific LinuxCNC example code. > > > > > > > > > > > > On 04/29/2016 08:29 PM, Danny Miller wrote: > > > > Having some preliminary thoughts about LinuxCNC's appropriateness to be > > > > a laser cutter, like 120W CO2. The other option is the open-source > > > > Lasersaur or Axecut. Those aren't particularly advanced trajectory > > > > planners or anything. > > > > > > > > Can it be a good tool for lasering? > > > > > > > > I did see where some people had done it with some hacks, but I don't > > > > know how practical they are. There was something about using a > > negative > > > > Z-value to turn on the laser. > > > > > > > > A lot of things come to mind. > > > > > > > > One, often the laser needs to turn on and off quickly, without > > > > stopping. If it's technically implemented as a Z-move, it would slow > > to > > > > move the nonexistent Z-axis. Would that work by just changing the > > > > Z-acceleration to something ridiculously high? > > > > > > > > Two, sometimes we do reduce the cut power, to only mark the surface > > > > instead of cutting it. Initially you reduce the depth of cut by > > > > increasing speed, but if it's paper, you can't increase the speed > > > > enough, you have to cut back on the power. And the required power will > > > > change inside the document. How would that get specified, just with a > > > > differing Z-depth? > > > > > > > > When not at the specified speed due to acceleration limits, the > > software > > > > needs to reduce the power to avoid delivering more energy/mm than the > > > > user specified. Actually this sounds like the easiest part, presuming > > > > we can get an accurate instantaneous speed. > > > > > > > > All power adjustments come via a PWM pin. > > > > > > > > Danny > > > > > > > > > > > > > > > > > > ------------------------------------------------------------------------------ > > > Find and fix application performance issues faster with Applications > > > Manager > > > Applications Manager provides deep performance insights into multiple > > > tiers of > > > your business applications. It resolves application problems quickly and > > > reduces your MTTR. 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