educa wrote:Hi. I was wondering. If I want to make my own electronics to control the lasercutter, then how is the engraving done?
I mean. When you rasterengrave, you move x axis and let laser shoot points. But does that mean that the x axis continues to move while the laser goes on and off or is it more like the laser head stops, shoots a dot and only after shooting is finished it continues to move a little, stops again and shoots another dot? I think if the x axis continues to move then you don't shoot dots but stripes and on the other hand if the head has to stop for each dot then you cannot reach very high speeds.
So does somebody know (maybe ever checked this with a logic analyzer) how this is done?
Thanks for any hints
Bart
educa wrote:Did you also test this out on a real laser?
Its hard to understand for me that this would actually work out well.
as far as I know you really pulse every individual pixel, but the question was more like: Is the head moving while burning that pixel or not) ?
With your solution I guess you'll get banding in the picture and certainly not a very smooth running stepper motor. Thats of course the biggest problem, dus know if the stepper is going to have problems with this....
educa wrote:Well I didn't mean how to do it in gcode actually.
I meant to ask how controllers like dsp do it?
There are obviously 2 ways of doing it.
1) is to burn a dot while head is not moving and then move and burn another dot. In this technique yur dots are perfect but you will not reach high speed
2) somehow the x axis continues to move, and the laser shoots on and off rapidly. It is not such a big problem to do this in software but I was just wondering how long a laser is then ON (0.2ms or so) to shoot 1 single dot and if the steppers are really moving during that shooting.
educa wrote:Well I didn't mean how to do it in gcode actually.
I meant to ask how controllers like dsp do it?
There are obviously 2 ways of doing it.
1) is to burn a dot while head is not moving and then move and burn another dot. In this technique yur dots are perfect but you will not reach high speed
2) somehow the x axis continues to move, and the laser shoots on and off rapidly. It is not such a big problem to do this in software but I was just wondering how long a laser is then ON (0.2ms or so) to shoot 1 single dot and if the steppers are really moving during that shooting.
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