@dc42 After wiring one backwards and blowing a capacitor and ordering another one I finally got spindle speed control. Thanks everyone.

If its help to anyone in the future here is my config for the spindle.

; Attemping to setup spindle

; CNC Mode (NB for Firmware 3.3+)
M453 ; CNC Mode

; Configure Tool 0 as the CNC Spindle
M950 R0 C"e0heat" Q2000 L12000 ; Create spindle index 0 with
; inverted PWM output on E0 heater pin
; and spindle speed of 12000 rpm at maximum PWM

M563 P0 R0 S"Spindle" ; Create Tool 0 with Spindle 0 and call it Spindle
G10 P0 X0 Y0 Z0 ; Set Tool 0 axis offsets
M568 P0 F0 ; Set Tool 0 to default RPM of 0
T0 ; Select Tool 0

My work donated a Benchman xt cnc mill to me but the control system is garbage. I am 90% sure that the mill has servo motors instead of steppers. Is it possible/practical to control 4 servo motors with any duet board or is there any other options out there.

I have experience putting together an MPCNC with a duet 2 wifi.

Re: The ULTIMATE RepRap Post-Processor for Fusion 360

I attempted to use this post processor to do my CAM, and am having trouble. At the beginning of the g code the spindle speed is displayed correctly, turning on at 11999 RPM. But later in the code it puts in random S11999's without the M3. Does anyone have a post that works with the duet?

Beginning of code

Randomly at different operations

@dc42 After wiring one backwards and blowing a capacitor and ordering another one I finally got spindle speed control. Thanks everyone.

If its help to anyone in the future here is my config for the spindle.

; Attemping to setup spindle

; CNC Mode (NB for Firmware 3.3+)
M453 ; CNC Mode

; Configure Tool 0 as the CNC Spindle
M950 R0 C"e0heat" Q2000 L12000 ; Create spindle index 0 with
; inverted PWM output on E0 heater pin
; and spindle speed of 12000 rpm at maximum PWM

M563 P0 R0 S"Spindle" ; Create Tool 0 with Spindle 0 and call it Spindle
G10 P0 X0 Y0 Z0 ; Set Tool 0 axis offsets
M568 P0 F0 ; Set Tool 0 to default RPM of 0
T0 ; Select Tool 0

@dc42
I have one of those coming today, it has a 3.3V PWM input so it should be much more simple to setup. Ill update when I give it a shot. Thanks for the help everyone.

https://www.amazon.com/dp/B079B5MRQC?psc=1&ref=ppx_yo2_dt_b_product_details

@cjm Still only getting around 5V no matter is I run an M5 or M3 at full speed. Tried jumper cap at both locations. The only other thing i forgot to test was taking out the ! that you didnt seem sure needed to be there.

Color code
Orange- E0-
Yellow at breadboard-Vin E0
Red to PWM on converter
Yellow 24V
Black Ground
Maybe the pwm to analog converter is fried?

@cjm I have read through that thread and still dont quite understand where to put the resistor. Is there a schematic or a picture of where it should be anywhere?

@t3p3tony The converter cannot take a 3.3V signal, is there an option for a 5V pwm on these boards?

@t3p3tony Thanks for your help, Ill give that a shot tonight.

@t3p3tony Thanks for your help, I wasn't sure if I should have put it in there.

I am also using this cnc to expand my skills so at the moment I am not very competent with electronics. Do i need to plug into the duet in another place? I tried the jumper in both settings and they both produced the same result of a constant 5V

Hi,
I am building an MPCNC and am trying to control spindle speed through software. I have a pwm to analog converter hooked up to e0 heat and it only outputs 5V. Can anyone show the config I should use?

Duet2 WIFI, most recent firmware 3.3 I believe.

https://www.amazon.com/gp/product/B085CCYW6L/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://www.amazon.com/dp/B08JTDJXLY?psc=1&ref=ppx_yo2_dt_b_product_details