Connect a AMB Kress or Mafell spindle with digital control

AMB Kress or Mafell spindle with digital control

PWM to voltage 0-10V converter (see links)

Small wiring cables suitable for 24V

'Disconnect the power supply of the duet controller first!'

PWM converter has 4 inputs (2 power + 2 pwm input signals) and 2 outputs (0-10V voltage). Make sure the yellow jumper is on the 24V pins as we are using the duet pwm signal output which is 12/24V.

Power wiring to the PWM converter

Connect the “VIN” power pin on the duet board (see image) to port 3 on the pwm converter “power supply + (12-30V)”

Connect the “GND” power pin on the duet board to port 4 on the pwm converter “power supply – (GND)”

Pwm signal wiring to the pwm converter using HEATER E0 of the duet board

Connect “VIN” from heater E0 to port 2 “PWM input + (din+)” on the pwm converter

Connect “E0-” from heater E0 to port 1 “PWM input – (DIN-)” on the pwm converter

Other than the power supply cable 110V/220V, the spindle has 3 small cables:

BROWN 10-26V DC (for power supply)

GREEN 0-10V DC (for speed control)

WHITE 0 V (for ground/GND)

Brown to “VIN” connector of the duet power supply pin

Green to port 6 “voltage output + (AO)” of the pwm converter

White to port 5 “ voltage output – (GND)” of the pwm converter

Connect port 5 “ voltage output – (GND)” of the pwm converter to the “GND” pin of the power supply on the duet board

THE LAST STEP (port 5 to GND pin duet) IS REALLY IMPORTANT! You create a common ground between the spindle and pwm converter/power supply

Under File Management > System click on 'config-spindle.g'. Then add the following lines

M950 R0 C"e0heat" L0:25000 Q100

L is the minimum and maximum RPM of your Spindle. Adjust accordingly.

Q is the frequency. If your spindle keeps fluctuating at lower rpms, change the frequency to 300. If it still keeps fluctuating, change it to 320 or 350 and so on.

M563 P1 S"Spindle" R0

Press the software emergency stop in the top right corner to restart the controller.

You can control the spindle manually using G-Code.

For example M3 S25000, turns the spindle on clockwise and sets the spindle speed at 25000rpm

M5 Stops the Spindle.

You can also control it in the 'Spindles' panel.

Press 'Turn On' will turn the spindle on clockwise at the RPM set.

You can change the preset RPMs under Settings > Machine Specific > Spindle RPM Presets.

If you have a multimeter, try to read the output voltage of the pwm converter (port 5 and 6). If it says 10V, you are on the maximum spindle speed.

You can also add a digital led voltmeter on port 5 and 6 of the pwm controller (see image 2)

Under File Management > System click on 'pause.g'.

Add the command M5 in the header, so the spindle stops when you pause a job while running

Open the resume.g file and add the following lines

M3

The Spindle RPM is not needed. It will go back to the RPM when the M5 command was sent.

G4 S10

Dwell for 10 seconds to let the Spindle get up to speed.

Modify the vectric's post processor to autmatically use spindle speed.

Go to the installation directory of the Vectric software, search for “grbl_mm.pp” and make a copy in the same directory and open the copy

Change the POST_NAME to something else, I did “GRBL (mm) (SPEED)

In the header, change “M3” to “M3[S]” to add speed to the M3 command

After your "M3[S]" line, add a new line "G4S15". This code tells the machine to wait 15 seconds to achieve full spindle speed before starting a job

Save your file in the post processor directory, make sure it ends with .pp or Vectric does not recognise it!

Next time you open the Vectric software, your new post processor will be added to the PP list