Scara Setup
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You can use M581 commands to disable the trigger at the start of the homing files and re-enable it at the end.
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I thought the group would like to know my experience setting up my Duet wifi board with my scara. I've previously had a smoothieware and decided to try the Duet and there is no comparison.
The Duet has fantastic GUI interface, and the help and setup files that David (dc42 ) has created is extremely helpful. Talking about David, he gives excellent support and helped me work through my small issues. If anyone was considering trying this board I would give it a super thumbs up.
I haven't had much time to fine tune the machine and it's going to be used for ceramics only.scara ceramic printer
[[url]https://www.dropbox.com/s/vsklk2lhr2dk4qy/20180205_111555.jpg?dl=0] -
Thanks for your kind words!
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David
I would like the ability to do 360 degree continuous prints. This means I'm printing continuously Non-Stop around the perimeter of the Scara.Because of this request, I also have proximity sensor on the prox arm. This sensor requires 5v, so what's the best way to wire this?
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What type of output does the prox sensor have?
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So what's the answer can we run 360 continuous?
LJ8A3-2-Z BX
Voltage: DC 5V
Theory: Inductance Sensor
Detection distance: 4mm
Output current: 200mA
Polarity: NPN
Ouput Status: Normally Open
Detect Object : Iron 15151mm
Response frequency: DC:0.5kHz AC:25Hz
Wire type: 3 wire type (Brown, Blue, Black -
You can connect that sensor directly to the Gnd and Stp pins of the endstop input, and power it from 5V.
I can't think if any reason why you can't configure the proximal arm to have a range of -180 to +180 degrees.
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David I don't think you understand my request.
I have a big scara , and I'm printing a large object with the machine in the center. Therefore I need to have the ability to go continuously in rotation as I built the object around the machine. -
I see what you mean. That isn't currently supported, but I will give i some thought.
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David I'm currently running smoothie with working continuous revolving future and in order for me to switch over this is necessary. I would appreciate if you could stick this into the firmware code.
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I'll add it to the list, but I have a deadline for the 1.21 release and I may not have time it implement it by then.
How do you propose to home the proximal arm? Or do you not bother?
Do you have some sort of slip ring arrangement to allow the proximal arm to rotate continuously without the hot end wires getting twisted?
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I have a standard homing sequence for the prox, and after homing this switch is ignored.
And yes I have continuous slip ring .
What's the deadline to finish 1.21? -
Prox switch
[[url]https://www.dropbox.com/s/pd58x96vdv9nci7/20180213_101118.jpg?dl=0]
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The deadline for the 1.21 release it the end of this month. I will try to include provisional support in the next RC, but I will need you to test it because I don't have a continuous-rotation SCARA arm.
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No problem with testing, we just installed Duets on the large scara.
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My first problem is that I have 2 WiFi networks within range. They both show up as available but I would like to only connect to the new router I purchased which is in close proximity of the Duets. How do I get rid of the first router I entered? Because sometimes it can't make up its mind and it gets confusing.
I have strong WiFi signal - 36 DB (M122)with the new router I purchase purposely to be close to the unit. But even with that strong signal I get a (Ajax error, reason time out)
The Duets will connect up with no problem and the connection is fine until I start to enter commands. So if I ask it to print it doesn't get through the entire homing sequence and the connection is dropped. Then I get the Ajax error message.It reconnects fine and stays connected but if I ask it to even home 1 axis it will disconnect???
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1. See the M588 command for how to forget the other WiFi network.
2. Check the MaxReps figure in the M122 report after homing and running other commands. A combination of high microstepping and a high homing speed can starve the processor of course cycles, causing WiFi disconnections.
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Micro stepping is set at 1 and the Homing speed is relatively slow.
M92 is 23563.7373. Steps / degree -
That's a very high steps/degree! I suggest you position the arm so that it executes a long homing move for both arms, then home the printer, then run M122 (reconnect if necessary first) and read off MaxReps from the report. Note that MaxReps gets reset after you run M122, so only the value in the first M122 after homing is significant.
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No problem with testing, we just installed Duets on the large scara.
I have implemented continuous rotation and my simulations on a bench set up (not an actual printer) seem to indicate it is working. So please try the 1.21RC2 release when it is available a few minutes from now. To enable continuous rotation of a joint, set the min and max angle ranges for that joint in the M669 command such that max - min > 360. Then the min and max values won't be used to limit the travel, however one of them will still be used to determine the position when homed.
