BenJackson wrote:educa wrote:1) Where do you have home or limit switch on X axis? On the left, the right, both?
2) Is it a homing or a limit switch (or doesn't that matter, because in the end they do about the same) ?
3) Is the machine running into the homing contact and then slowly going away until contact is lost again?
It's on the left, under the gantry, contacted by an extended M5 bolt (covered by a nylon bushing) on the rear V-wheel. I believe it's exactly as depicted in the plans (though I have not looked since the makerslide plans were released).
It's a home switch. You can see in the .hal file that the "home-x" net (arbitrary name) is connected to parport.0.pin-10-in-not (that is pin 10 inverted) and to axis.0.home-sw-in. I'm pretty sure home always defaults to minimum in EMC but you can probably invert the sign of HOME_SEARCH_VEL and set HOME_OFFSET to home elsewhere.
It searches for the switch at HOME_SEARCH_VEL and then backs off and re-homes at some lower speed. I made sure my switch would trigger soon enough that the carriage does not hit the physical endstop at HOME_SEARCH_VEL.educa wrote:4) Where do you have home or limit switches on Y axis? (If you stand in front of the machine, is it close to you or at the farthest distance?
Close (again, minumum Y) and on the right. As in the plans at the time I built.
Imagine the cutting table (and the "axis" display) as a piece of graph paper. 0,0 is in the lower left. X increases to the right, Y increases up (or away from you on the cutting table). Not to be confused with computer graphics where Y increases down.
evokanivo wrote:For raster/engraving, the power level (laser-pwm) is constant (!!??) and the streamer module governs the on/off times for laser-final, which results in beam intensity? This doesn't seem right to me. I would expect power to be set by the laser-pwm pin like in PPI cutting, and for laser-final to be on continuously for each scan-line.
jv4779 wrote:Take a look at my modifications to Ben's linuxcnc configs.
One of the biggest changes is the engraving is done in pure gcode (with a custom component) so that the resulting file can be touched off and combined with any other gcode without issue.
educa wrote:Any idea Ben at what speed you can aproximately switch on and off a co2 laser tube during raster engraving ?
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