Ok if DC42 says so I will start to reconsider my usb interface
I will not be able to use the web interface as the process is automated, is there a way to use this file transfer to the SD card without the web interface ?
with HTML requests I suppose ?
Also, the ethernet port of the RPI is already used for internet connexion, is it possible to use a dual ethernet port extension such as the ethernetberry to connect the Duet ?
It can be done (with the Duet supporting both a Laser and CNC mode). You will just have to write both configurations (with the new firmware in Beta, it is possible to easily load different configurations). Also have a way to accurately position the laser/cnc bit is a must.
For a setup like this, I would recommend using a laser module (not the Co2 laser tubes), the ones that can more easily be attached to a head. I have actually looked at them and found that some places have them in 15W modules (greater than that was no where to be found when I looked). These modules simply laser out their bottom, and have a cooling fan at the top (so no mirrors to arrange) - attach them to your machine head and you are mostly good to go.
As with any dangerous operation (like both CNC and Lasers), care should be taken as it can easily become deadly. It is a good idea to make sure that the laser can't accidentally turn on (there is a module that one will need to make that will correct this - details are on the Duet Wiki). The reflection of a laser is very dangerous to eyes, ensure you either have a safety cover or filtering glasses (for the exact frequency of the laser).
Note that CNC creates dust and chips, lasers want a very clean environment (with gas extraction to get rid of the vaporized material - you should not breath in that vaporized material).
Typically Laser machines need less strong motors, while a CNC needs strong motors - if the motors are not strong enough it can get dangerous (cutting too slow can cause the dust to start catching fire - I have personal experience on this, it only started to create embers when I stopped it). Lasers don't mind strong motors.
Well, it looks like I'll have to wait for the firmware update. I posted the last reply too soon, and should have run the test first. The changes to Fusion's post worked fine, and the beginning of the output is as follows:
;T1 D=6.35 CR=0 - ZMIN=0.501 - FLAT END MILL
M291 P"Insert Tool 1, D=6.35" R"Tool Change" S2
Same problem. I also changed it to put the M291 command directly in the GCode file instead of calling a macro. Same problem. Bummer!
The crinkly effect where ridges parallel to the X axis at one end of Y turn into valleys at the other end indicates that you still have some backlash. Some possible causes:
Lack of lubrication on the ball joints. I use a little silicone grease.
Carriages too tight on the linear rails so that they stick when the belt reverses direction.
Carriages too loose on the linear rails, so that they rotate a little when the belt reverses direction.
Belts too loose.
Loose pulleys (but that would probably cause a bigger problem then your height map shows).
You can measure the backlash of the system excluding the joints. Put a piece of paper under the nozzle and jog the effector down in units of 1 microstep until the nozzle just grips the paper. Then measure how many units you need to jog up again to release the paper.
You can also look at the carriage position under magnification, and use G1 S2 commands to see what is the smallest movement that you can command in the opposite direction to the previous motion that actually causes a movement.
@bearer,that's a good point, but I just tested without ground connection and the test button does shut the power.
Possibly it simulates unbalance by sending current from L after the current transformer back to N before the current transformer, but I don't know for sure.
To summarize things up:
In the end, the all-integrated-closed-loop JMC-stepper where the bottle neck because instead of T2.5 what was printed in their datasheet they had to be minimum T3.2, slowing things down...
See thread here:
I can see now the benefit of an all integrated solution Cannot wait to see what the duet3 will be capable off!
Looks like the main reason to use multiple inputs to a trigger is to have all the endstops trigger an emergency stop. Maybe we should use a separate GCode command for that.
And then there's this idea ... Sounds like the real solution, then you can rework M581 to your heart's content.
@rod-todkill said in Duet for 350 Degrees Celsius Printer:
Im a little confused as to which one I would need or both ?
I'm a little confused about what you're asking. Are you referring to the PT100 and thermocouple mentioned in the linked thread?
Have you read the documentation for each?
Or the comparison of thermal sensors?
If you've read those and still have some confusion, come back and ask a more specific question.
In general though there isn't anything about the Duet that would stop you from printing high temperatures. It's capable of controlling all the hardware needed to achieve high temp prints.
E3D is now selling hotends and print beds suitable for high temperature applications, including water cooled options for use inside a heated enclosure. They would work very well with the Duet.
Taking a 10mm cube as an example, using a 20 tooth pulley would mean either 50 or 100 full steps per side. Using a 16 tooth pulley would mean either 62.5 of 125 full steps per side. So in that example, the 16 tooth pulley with a 1.8 degree motor would rely on microstepping for positional accuracy (because 10mm equates to 62.5 full steps).
@deckingman, I think that even in the first example it relies on microstepping because the corner ends are not necessarily on full step boundary. This also applies to the Z axis, even if you use 'magic numbers' your layers can be on a fraction on a full step.
(would be nice if the Duet would be full step aware, e.g. round to full step on idling, allowing to round to full step on homing, etc. This has several advantages such as less stepper noise on idling, less chance of step mismatch between two Z motors, etc).
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