Printing a Dot in Lasermode

Ikswoknib

Hello,
I modified my Printer with an laser. Normally the Laser is only activated when there is an X or Y Movement.
But I want to laser some Points. Is this possible anyhow? Maybe by telling the printer to activate the laser for a quite short time without movement. Or maybe activating the laser while only Z-Movement? Maybe with an custom G-Code?

RAyWB

simplest way is via ( small ) z-move. from my opinion move should not exceed 0.1 mm to stay focused

just use a low feedrate to get enough power.

Ikswoknib

But when using only z-move the laser is off. Only if x or Y move the laser goes on

RAyWB

which firmware version do you use?

it has to be G1 move

Ikswoknib

Yes I know, with g0 it does only moving, without laser. But even with G1 the laser is only on if moving x or Y.
I use firmware 1.02

RAyWB

As I´m using V2 for my laser now i have to search a little for the V1 behaviour.

what hardware do you use? and how i laser connected?

RAyWB

take a look at motion.cpp

search for

#if defined(SUPPORT_LASER) && SUPPORT_LASER
else if(Printer::mode == PRINTER_MODE_LASER) {
p->secondSpeed = ((p->delta[X_AXIS] != 0 p->delta[Y_AXIS] != 0) && (LaserDriver::laserOn p->delta[E_AXIS] != 0) ? LaserDriver::intensity : 0);
p->delta[E_AXIS] = 0;
}
#endif

as far as i remember this section is there twice.

if you change that sections to

#if defined(SUPPORT_LASER) && SUPPORT_LASER
else if(Printer::mode == PRINTER_MODE_LASER) {
p->secondSpeed = ((p->delta[X_AXIS] != 0 p->delta[Y_AXIS] != 0 p->delta[Z_AXIS] != 0) && (LaserDriver::laserOn || p->delta[E_AXIS] != 0) ? LaserDriver::intensity : 0);
p->delta[E_AXIS] = 0;
}
#endif

the trick with z-move should work. but take care on your eyes ,don´t forget safety googles

Ikswoknib

This works quite good.

Thank you for the help

best regards

Iksi