rail core 2 300zl clone
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@kraegar is the person to ask as he designed the beast!
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im hoping he dose.
i should also state we are useing a precision peizo -
Interesting changes to the design there, will be interested to see how it does for you. Especially without the side panels, which give the machine its rigidity.
To answer your question on the steppers - the duet doesn't care what side they're on, as long as you follow the guide here: https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCoreXYPrinter
Specifically, this bit is key: For a CoreXY or H-Bot machine, RepRapFirmware assumes that the motor connected to the X motor output moves the head in the +X and +Y directions when it runs forwards, and that the Y motor moves the head in +X and -Y directions when it runs forwards.
As long as you get that correct, it'll be fine for the motion.
Co-Creator of the RailcoreII CoreXY printer
https://www.thingiverse.com/thing:2407174 -
@T3P3Tony - is there a typo in that page? lol. Someone just pointed out it says +X twice there (I copied and pasted)
Co-Creator of the RailcoreII CoreXY printer
https://www.thingiverse.com/thing:2407174 -
@kraegar said in rail core 2 300zl clone:
@T3P3Tony - is there a typo in that page? lol. Someone just pointed out it says +X twice there (I copied and pasted)
No, I'd say that's correct. To save confusion, call the two motors A and B. So A running forward gives +X and +Y. Therefore it follows that A running backwards gives -X and -Y. B running forward gives +X and -Y so B running backwards gives -X and +Y. Those are all 4 possible move combinations.
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Ah, good call. Wasn't near my printer, just reads a little odd.
Co-Creator of the RailcoreII CoreXY printer
https://www.thingiverse.com/thing:2407174 -
@kraegar Indeed yes. Translating motor movement to axis movement on a CoreXY seems to defy all logic at first glance - it gives me headaches just thinking about it
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@deckingman Yeah, I have to draw it out or see it in person every time I want to think through it.
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@bendiesel
I am a rff noob but I think you always want your xy motor settings the same as they work together. In config they are not.As for 3 Z motors. I only see one Z configuration? Edit i did see some Z motors defined 234.. Way out of my knowledge
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So we got it up and running. Were having a weird increasing z offset each time we probe. Any ideas?
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Firmware version?
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@bendiesel said in rail core 2 300zl clone:
Were having a weird increasing z offset each time we probe. Any ideas?
The changing offset may mean that you are probing too fast. When the Z probe triggers, the firmware commands the Z motion to stop abruptly. If you probe too quickly then inertia may cause the Z motors to keep rotating and skip steps, leaving the nozzle lower or bed higher than the firmware thinks it is. So try reducing the probing speed (F parameter in M558).
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Update. Still having problems with probing with the precision piezo
At first we thought it was the boden tube causing a error so we removed it. Didn't help
Hoping the piezo guy could help with this.
We reduced the probe speed aswell but no avail.
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@bendiesel I may be wrong but I think probing speed needs to be a little high so that a distinct and immediate contact is registered.
Perhaps fire off an email to the precision piezo contact email?
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I suggest getting your wiring bundle some support, btw. I use a small clip on the top rail of my printer, and a 36" zip tie to connect the wiring bundle to. The zip tie is very flexible, so doesn't limit motion, but can't fall over. Works great.
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That is how my corexy is set up in terms of the top motors as well as how the y axis is also set up. My z axis motors are set up 90 degrees clockwise to that. The only major thing I can see compared to mine, and some of the others might be able to help you as I am still a bit of a noob, is that you have not defined the virtual axis for all the other Z motors (U and V). For you motor speed, current, acceleration, jerk etc you need to have it written in their format Mcode X.... y..... z...:....:.... u..... v..... e..... where the three values in the z should be the same as the values in the u and v bits. You also have not defined enough motors. In your config you have said that z is three drivers but you have only defined 5 where you should have 6 defined for the 2 corexy motors, 3 z motors and and extruder.
Also I see you have defined the locations of the lead screws. Make sure that the order that you have defined them in, is the same order that they are writen in terms of the z, u and v coordinates ie if your first x and y coordinates are for the left hand motor, it is the one connected to the z port and so on. I used 0,0 to measure all the lead screw locations and some values are negative which is fine.
Here’s is the first part of my config file.
; Drives
M569 P0 S0 ; Drive 0 goes forwards X Axis
M569 P1 S0 ; Drive 1 goes forwards Y Axis
M569 P2 S0 ; Drive 2 goes forwards Z Axis 1
M569 P3 S1 ; Drive 3 goes forwards Z Axis 2
M569 P4 S0 ; Drive 4 goes forwards Z Axis 3
M569 P5 S1 ; Drive 5 goes forwards Extruder; Motor remapping for dual Z
M584 X0 Y1 Z2:3:4 U3 V4 E5 P6 ; Driver 0 For X, 1 for Y, Z=2:3:4 U3 V4, Extruder 5
M350 X16 Y16 Z16:16:16 U16 V16 E16 I1 ; Configure microstepping with interpolation
M92 X80 Y80 Z400:400:400 U400 V400 E420 ; Set steps per mm
M566 X150 Y150 Z12:12:12 U12 V12 E120 ; Set maximum instantaneous speed changes (mm/min)
M203 X150 Y150 Z180:180:180 U180 V180 E1200 ; Set maximum speeds (mm/min)
M201 X250 Y250 Z250:250:250 U250 V250 E250 ; Set accelerations (mm/s^2)
M906 X850 Y850 Z1850:1850:1850 U1850 V1850 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Axis Limits
M208 X0 Y0 Z0 U0 V0 S1 ; Set axis minima
M208 X400 Y400 Z420 U420 V420 S0 ; Set axis maxima
M671 X256.6:-53.6:100 Y239.10:239.1:65.50 S3 ; Define the X and Y coordinates of the leadscrews. Motor order: FR (1), FL (2), RC (3).Snn Maximum correction in mm to apply to each leadscrew (optional, default 1.0)I hope any of my above ramblings helped.
Kind Regards,
Sam
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@samlogan87 thank you for the reply. We have the bed leveling working. The problem is were getting inconsistent probing. Are you saying that it could be because each motor is out of sync of some sort?
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Maybe. I am still a bit of a noob around here, however my printer basically is built very similar to yours (other than the z motors location, almost the same). I believe you need to add those values in so they can run independently of each other to level correctly as well as for normal operation. I read the how to do it from a guy who’s blog is betrue3d if I recall correctly.
Try changing those values and see what happens.
Regards
Sam -
How long are the wires from the piezo disk to the piezo PCB? I can't see where you have the board mounted.
You also need to include a delay into the probe routine ( include R0.5 in your M558). This makes the printer wait for half a second between XY movements and Z probe movments to allow vibration to die down. Also, you should probably use the P8 mode rather than the P1, the output of the piezo PCB is digital, using P1 (analogue) only increases the chances of false triggers.
Idris
