@sindarius Just tested and working well - many thanks!

PS - I've just discovered that LinuxCNC supports an extended version of G10 in which P0 is allowed and means use the current coordinate system. That's not currently supported by RRF, but I can add it in the next 3.4 beta release.

@dc42 said in Duet 2 vs Duet 3?:

@baird1fa currently the only supported way to run external drivers from Duet 3 is to use the external driver boards. We have some developments under way that may be of interest, if you can wait long enough:

We are also looking and ways to provide a separate 48V motor power input to a future version of the MB6HC

I have seen this pop up on the forums sporadically for a while now. Is there any indicative timeline for the 48V version?

@fcwilt Both off nothing going and both doesent sound good. I don't know what would happen.

@tom33 you can use M500 P10 to save parameters including all tool offsets in config-override.g.

Can you be more specific? Where are you seeing cutting times? What gcode are you executing? Firmware?

I'm also looking for the sources to new CNC reviews and all, Currently I'm using tools like thickness planer and table saw. but I also planning for to add CNC to new production.

@graesand, RepRapFirmware should already support that kinematics. You will need to create the UVAB axes using M584, and use M669 to specify Cartesian (or CoreXY) kinematics, but provide a custom matrix to specify how XYUV map to the corresponding motors.

You will need to do the preview GUI yourself. You may be able to adapt the existing GCode preview plugin in Duet Web Control.

For the hardware, you will need 7 motor drivers assuming a single Z motor. If you want to use Nema23 motors then I suggest you use a Duet 3 MB6HC as the base board. To drive the 7th motor you can use a Tool Board if it is a Nema 17 with modest current requirement; otherwise EXP3HC. If you decide that Nema 17 motors are sufficient, then a Duet 3 Mini with the Mini2+ expansion board should suffice.

@dc42 Is there any way to trigger a macro when M3 / M4 / M5 commands are issued? If not I would like to suggest adding a method of doing so. It would allow me to use execonmcode to send commands to the ODrive and give me extremely precise control over my RPM. It would also allow people who have spindles that require the RPM to be set manually to be prompted with M291 messages to change the RPM appropriately. Many hobby CNCs use off the shelf palm routers for their spindle.

@bitminter the "Mtp9" is a corruption of "M409" with an additional bit converting the "40" to "tp" on each of those two characters. So it looks like the PanelDue cable is picking up interference. Does it run anywhere near a stepper motor cable?

Here is my finished Macro. Hopefully will be helpful for others. I am not entirely sure why certain things behave a certain way though. This Macro does allow me to reliably change tools and still position the base of the tool a the work piece zero position.

; If the printer hasn't been homed, home it if !move.axes[0].homed || !move.axes[1].homed || !move.axes[2].homed G28 ; Clear the tool Z offset G10 P0 L1 Z0 G53 G0 Z0 ; Go to 0 Z in Machine Co-ordanates var ZBeginPos = move.axes[2].userPosition ; Save the Z starting position (might not be 0) G53 G0 X{global.BtStrXLoc} Y{global.BtStrYLoc} ; Move to BitSetter location G91 ; relative positioning ; Adjust probe for high speed probing M558 K0 P8 C"!io3.in" H20 F600 T300 ; Z probe number - Z probe switch type - probe recovery 1s probe speed and travel speed G31 K0 P500 X0 Y0 Z0 ; Set trigger value - set offset and trigger height - Z probe number ; Seak down rapidly till we contact the probe G38.2 Z{move.axes[2].userPosition + global.BtStrZTrig} ; Move up 2mm G0 Z2 ; Adjust probe for low speed probing M558 K0 P8 C"!io3.in" H20 F120 T300 ; Z probe number - Z probe switch type - probe recovery 1s probe speed and travel speed G31 K0 P500 X0 Y0 Z0 ; Set trigger value - set offset and trigger height - Z probe number ; Seak down slowly till we contact the probe G38.2 Z{move.axes[2].userPosition - 3} var ZEndPos = move.axes[2].userPosition ; Save the Z end position ; set the tool offset G10 P0 L1 Z{global.BtStrZTrig - (var.ZEndPos - var.ZBeginPos)} G0 Z5 ; rapid move Z axis up 5mm

@nraynaud

What that needs in the machine is inverse kinematics of the machine to Calculate the positions for a given tool center point position. No open source controller currently does this properly, though linuxcnc has it on experimental basis.

@sergei There are two different pieces within Duet (RRF). The "firmware" is the code that drives the motors and reads the sensors. The firmware treats CNCs slightly different from 3d printers (e.g. you don't need an extruder) and so my milling machine and CNC router announce to the firmware that they're CNC devices. Mainly the firmware is device-agnostic.

In addition there is a user interface (DWC - Duet Web Control) that talks to the firmware. There is a version of the DWC specific to CNCs (see the post in this section) that you can use that will totally change the dashboard look and feel to be friendlier to a CNC. I use this on a CNC router because it fits the router - it supports selecting a coordinate system and it has a much larger position display. I use the stock DWC on my milling machine because imho it fits my style better.

@cthulhulabs Love your use of variables, didn't know they were operational already, will definitely start using them also ! Thanks and have a nice one !

@droftarts said in DC Spindle from Bed Heater with PWM:

Seems like you may need to ramp up speed to avoid burning out the controller.

Would it be possible to write a Meta Code macro in RRF to do the ramp-up?
How would you set this up?

define a GPIO pin as 'spindle-output' trigger the trigger-macro reads the PWM duty cycle (that's the hard part of the equation) the macro ramps-up the heater output optionally sets another trigger, when motor is ramped up

@krohm-koala - Thank you for your reply. I was just trying to point out that you should value your own time, even a day developing your own and you are basically valuing your time at very little per hour after material costs. Thats why we made them available for others. Take care.

@miss-rebekah I'm a machinist too (30 years in aerospace) . I think it's important to realize the value in the Duet. I dont think it was ever intended to be a full feature cnc controller (although it is quite capable) rather the focus is on 3d printing. For less than $150 it is extremely powerful but it does lack a a tad in the cnc department but continualy improved. I assume if you are going single block you are not doing the programming were here you will program so you already know what the machine is supposed to do next. Although there is no feed hold (before the buffer runs out) that I am aware of you can set up an emergency stop button that will keep you from tearing anything up. If you want your router to act like your machine at work I would suggest looking at Acorn or Oak but be prepared to pay a lot more for those additional features you mentioned. I say give it a try and I'll think those few things will become a non issue. Duet and RRF is very user friendly once you get past the learning curve and it's all g code so I think you'll feel very comfortable with it.

If you use G92 to set Z to zero, make sure that you allow the Z axis to go negative by more than you will need to cut, or set it to the minimum depth. The firmware by default won't allow the axis to go negative, so you will get an error "out of limits" and your gcode will abort when you try to plunge into the work.

You'll also want to allow negative movement in the X and Y axes as well, since most CAM software sets the 0,0 point as the outside of whatever shape you're cutting and will want to go negative by at least 1/2 your tool diameter at some point.

join the EAA for40$ a year get maker/student version of solidworks 2019 mine will make toolpath. with cam option installed

fyi i love solidworks for cad, for cam its a turd with a rough learning curve,, but 40$ a year cant beat it.

disclaimer: im not gettng a kick back from eaa i dont own a plane or building one.. and i use old versions of mastercam and featurecam for CAM, if i didnt i would use it for my hobby ventures. ive been a cnc machinist/programmer for 25 years

Thanks @dc42. The laser is connected directly to heater 3 (pin 8 ) and that inversion does appear to be all that was required.

So, just to clarify in case anyone else is reading this:

M452 C"!exp.heater3" R1000 F5000

Will work on the toolpath post processor now.

Thanks again.

E