Laser Electronics: Difference between revisions
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== Laser Cutter Electronics == | == Laser Cutter Electronics V2 (not complete) == | ||
===Leadshine DM442 stepper drivers=== | |||
Requires program: [http://www.leadshine.com/UploadFile/Down/ProTuner_DM_Setup_2013-11-06.zip ProTuner DM] | |||
Requires FTDI USB to RS232 cable, plus DIY adapter: [[File:DM442_cable.jpg|100px]] | |||
Knockoff RS232 converters don't provide full RS232 voltage levels, and the DM442 drivers won't respond. | |||
Alternatively you can use an old laptop with a hardware RS232 port. | |||
After installing the software, in C:\windows\sysWOW64, in an elevated prompt, run: | |||
* regsvr32 mscomm32.ocx | |||
* regsvr32 mscommctl.ocx | |||
* regsvr32 COMDLG32.OCX | |||
* regsvr32 MSHFLXGD.OCX | |||
Note that this program writes to the DM442 immediately after making changes, so BE CAREFUL. | |||
===Internals=== | |||
[[File:LaserInternalsV2-Front.jpg]] | |||
[[File:LaserInternalsV2-Back.jpg]] | |||
The X, Y, W stepper drivers (Leadshine DM442) drive the three stepper motors, and are powered with 27V. | |||
They are constant-current drivers, and are limited in software to an appropriate current for the three axes. | |||
The software configuration means that they are NOT interchangeable. Replacement units MUST be programmed (see above). | |||
The PIC board receives 12V and provides 5V for the rest of the electronics. | |||
===FPGA=== | |||
The FPGA driver is a [http://store.mesanet.com/index.php?route=product/product&product_id=55 MESA 5i25] | |||
The LinuxCNC driver is [http://www.linuxcnc.org/docs/devel/html/man/man9/hostmot2.9.html HOSTMOT2] | |||
===LinuxCNC changes=== | |||
We added custom components binaryscaler.comp and laserpwmcalc.comp | |||
binaryscaler produces a floating point [0-1] value based on the front panel switches. | |||
laswerpwmcalc handles several inputs and produces a PWM output to drive the laser tube: | |||
*graster | |||
*binaryscaler [0-1] | |||
*M3/M4 S[0-1] | |||
*actual velocity | |||
<pre>sudo halcompile --install laserpwmcalc.comp</pre> | |||
M3 is the conventional 'spindle activate' command used to turn the laser on/off. Historically it was either on or off, but now accepts fractional power. | |||
Features described below should not work in M3, otherwise referred to as 'compatibility mode'. | |||
M4 is the new 'spindle activate' command which uses the concept of severance energy. | |||
The movement speed of the laser (feed rate) is automatically coordinated with the cutting power. | |||
Corner compensation is always enabled in M4, so as the feed rate decreases the cutting power decreases to match. | |||
It is also possible (and recommended with M4) to enable adaptive feed by setting M52. | |||
E.g. for a low energy cut, the laser will operate at maximum speed, and a low power. Increasing the energy increases the cutting power to maximum. Further energy increases instead will decrease the cutting speed. | |||
Note that M4 speed changes will only *decrease* the feed rate. You should set the feed rate to the highest acceptable value. | |||
===Recommended Gcode=== | |||
<pre> | |||
G20 (Inches) | |||
M52 (Adaptive feed enable) | |||
G64 P0.001 (Path blending enable; tolerance at machine resolution, 0.001") | |||
M4 S0.5 (S value [0, 1] for severance energy) | |||
</pre> | |||
or | |||
<pre> | |||
G21 (Millimeters) | |||
M52 (Adaptive feed enable) | |||
G64 P0.0254 (Path blending enable; tolerance at machine resolution, 0.001") | |||
M4 S0.5 (S value [0, 1] for severance energy) | |||
</pre> | |||
== Laser Cutter Electronics V1 (out of date)== | |||
[[File:Laser-control_board.pdf]] | [[File:Laser-control_board.pdf]] | ||