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K40-III

This is a cheap Chinese built laser that comes with a couple of different control boards, and some proprietary software.

Control board - 6c6879

This board uses a flat ribbon cable for X axis motor and both X and Y limit sensors, a 4 pin JST connector for the Y axis motor, and a 6 pin connector for power and laser control.

Connectors

Y stepper cable

Color Signal Connect to
RED XA+ J18.2 A
BLUE XA- J18.3 A
YELLOW XB+ J18.4 B
WHITE XB- J18.5 B

Flatcable for X stepper and endstops

Pin Signal Connect to
PIN12 XA- J24.1 A
PIN11 XA+ J24.2 A
PIN10 XB- J34.3 B
PIN9 XB+ J34.4 B
PIN6 COMMON J34.4 GND
PIN5 XHOME J34.2 XHOME
PIN4 YHOME J34.3 YHOME
PIN3 +5V J34.1 Vsensor

Power and Laser

Pin Signal Connect to
1 Not Connected
2 Laser
3 5V
4 Not Connected
5 24V
6 GND

PSU

The PSU has 4 connectors.

1. K+/K- - Laser Test button
2. G/IN/5V - Power control potentiometer
3. D+/D- - Laser enable/safety interlock
4. 24V/G/5V/L - Power to controller board

Our K40-III had a completely different power system. Also the Moshidraw board and cabling we replaced didn't use the 5V rail that PSU generated, but you can (if you don't want to add the wire) use the 7805 to drop the 24V line to 5V.

Here are some photos of this PSU

Hooking it up

K40-III 6c6879 Connections to Laos board
K40-III Material Settings
K40-III Improvements

Other Notes

This machine is not what you'd call up to standards. Please bear in mind that there is no:

  • Lid sensor
  • Sensor to see if water is flowing
  • Laser temperature sensor
  • Cutting area temperature sensor to monitor for fire
  • Extractor sensor to make sure fumes are being extracted.

Buy and operate this machine at your own risk. It is cheap, but you get what you pay for. In the K40-III Improvements will be some circuits to overcome some of these issues.

config.txt View (1.2 KB) darrenp, 2012-12-03 15:49

PSU.jpg View (54.3 KB) darrenp, 2012-12-03 15:49

controller.jpg View (126 KB) darrenp, 2012-12-03 15:49

IMG_20121120_224009.jpg View (538 KB) darrenp, 2012-12-03 15:49

IMG_20121120_224207.jpg View (592 KB) darrenp, 2012-12-03 15:49

config-parag0n.txt View - Alternative config used by parag0n on a LAOS v0.2 (1.54 KB) parag0n, 2012-12-17 23:56

flatconn.jpg View (155 KB) oyvind81, 2013-02-22 17:39

laser_psu_largebrd.jpg View (1.52 MB) DeanoC, 2013-03-10 19:35

laser_psu_smallbrd.jpg View (1.36 MB) DeanoC, 2013-03-10 19:35