Trouble setting the end stops on my Rostock MAX v2

[wcogen]

Everything was going fine until this step, Adjusting the End-Stops.

G0 Z0 X77.94 Y-45 F3500 puts in the nozzle into the bed.
G0 Z0 X-77.94 Y-45 F3500 leaves the nozzle about 1/2 inch above the bed.
As someone else said in the forum, turning the end stop screws don't seem to make much difference.
G0 Z0 X0 Y0 F3500 leaves the nozzle X 20.00 and Y -13.00 from the actual center of the bed.

I then started over. Cleared the eeprom, reloaded the firmware and repeated the calibration steps. Same thing.

Doing some experiments it seems that the Y-tower stepper is faster? than X and Z steppers. In doing the Z-Position this second time I checked that the skates were all at the same height from the top. They were within 1 mm of each other at the top after a home all command. As I spun the dial to lower the extruder to the bed, the Y skate was traveling faster per turn than the X and Z skates. The result is a nozzle offset from the center of the bed.

Here are some photos to help explain the problem.

https://drive.google.com/folderview?id= ... sp=sharing

Thanks for listening
Bill

[DavidF]

Try running your g code scripts thru repetier and see what happens......

[Kevinvandeusen]

Try swapping wires on rambo. See if problem follows
Make sure all motors are same part number

[wcogen]

That is what I'm using to send the G code. I carefully followed the directions in the manual twice. The nozzle is centered at the top. As I move in only the Z direction, using the manual mode in repetier or the front panel to zero the Z axis, the Y axis 'seems' to move faster and when the nozzle is at 0, it is no longer centered. And, adjusting the end stop screws has little or no effect.

[wcogen]

I'll check the motors and switch wires. I'll report back. Thanks.

[DavidF]

What happens when you just send G0 Z10 F3500, instead of G0 z0 x0 y0 F3500??

[wcogen]

I checked that the motors are all the same. They are the same.
When I send G0 Z10 F3500, the same result, when it gets to the bed, the nozzle is not in the center.
I switched wires between X and Y. Wasn't I surprised when I clicked on the HOME button!

I figured I'd change the Inverting axis direction from:
#define INVERT_X_DIR true
#define INVERT_Y_DIR false
#define INVERT_Z_DIR true
To:
#define INVERT_X_DIR false
#define INVERT_Y_DIR true
#define INVERT_Z_DIR true
to fix this.
Well, all the skates move in the right direction. I'm able to use manual controls and move the nozzle left and right and up and down. However, when I click on home, it reaches the top and IGNORES THE END STOPS! Just crashes there until I power it off.

I'm confused.

I returned to the original Inverting axis direction defines. Now the end stops work.

What am I missing?

Thanks again.
Bill

[DavidF]

your missing that the end stop swith is not on the same tower as the stepper motor......???

[wcogen]

Oh. Of course. I'll switch motors, switches and motor direction in the firmware and try that.

This begs the question, if all three end stop switches are pressed, why would all the motors keep running? Even if they weren't connected to the correct motor, shouldn't they stop? I quickly powered the unit off. I then looked at the end stop switches and they were all pressed.

This problem, being unable to set the heights of the skates with the end switches is just so puzzling. I feel it is something right in front of me. I took great care in building the v2. I've followed the excellent assemble manual very carefully. From the images I've included in the post you can see that the Y axis skate moves further than the X and Z skates. This gives the offset at the bottom. And, again, adjusting the end stops didn't seem to make a difference.

I'm going to do the XY switcharoo test (pun intended) now. I'll post the results here.

[DavidF]

check over this post
http://forum.seemecnc.com/viewtopic.php ... 527#p48527

[wcogen]

I may have been misleading you all a bit. I should have stuck to the facts and left my noob opinions to myself.
The build went well. Power up went well. Everything worked as it should. This is what I found when I adjusted the End-Stops.
I followed the directions and after setting the Z-height, tried to adjust the end stops. The nozzle crashed heavily into the bed.
I cycled power and turned the Y Skate end stop screw to the right 2 turns. The nozzle crashed heavily into the bed.
I cycled power and turned the Y Skate end stop screw to the right 2 turns. The nozzle crashed heavily into the bed.
I wasn't seeing much of a difference at all. I moved the Z height up, to avoid the nozzle crashing into the bed, and found the distance
from the nozzle tip from one side of the bed to the other was large. Easily more than a half inch. I thought that was a lot.
I removed the Y Skate end-stop screw entirely. That brought the nozzle up some, but not enough.

I put eight new photos here, https://drive.google.com/folderview?id= ... sp=sharing
They are:
1-Y Skate with end-stop screw 0296.jpg - Shows the Y Skate with the end-stop screw installed.
2-All End-Stop screws even 0295.jpg - With all end-stop screws even, the nozzle is off center by a lot. The little tee is centered on the bed.
3-Y Skate without end-stop screw 0302.jpg - Shows the Y Skate with the end-stop screw missing. This goes beyond screwing the end-stop screw in, to the right, all the way. The is the highest the Y Skate will go.
4-Y Skate end-stop screw out 0298.jpg - With the Y Skate end-stop screw out, this is the offset.
It is closer to the center now. The X and Z end-stop screws were in place.

As an experiment I backed out, turned to the left, the X and Z end-stop screws many turns, and the nozzle moved even further to the center. That was the end of the adjustment. I guess as a last resort I could get extra long end-stop screws for the X and Z Skates?

There are four more photos to look at:
X tower end, high block 0304.jpg and Z tower end, high block 0305.jpg
X tower end, low block 0307.jpg and Z tower end, low block 0306.jpg

These pairs clearly show the difference in nozzle height from one side of the bed to the other.

Note, my v2 is still in switcharoo mode.

Again, thanks for listening.

Bill

[DavidF]

How about a screen shot of your eprom settings?? Thinking the x y z max length values might not all be set the same as they should be...

[RegB]

Kinda/almost seems like the end stop screws aren't on the same side of the skate(s) as the micro-switch(es) ...???

[Russ]

Also might want to check that the zstop connectors are plugged into the MAX sockets, and not the MIN sockets on the Rambo. This is what I did and the end stops didn't seem to work when I did the zstop test with my finger and repetier-host.

[wcogen]

Thanks for the suggestions.

I checked the endstops and they are plugged into the Max sockets.

I checked the XYZ max lengths. X and Y are set to 250. Z max length was changed and set to 373.960 when the Z height was set. I tried setting them all to 250 and found no change.

I noticed that Tower XYZ offset [steps] were 0, 61, 140. Subscribing to the 'poke and pray' method of troubleshooting (only sometimes, really), I set them all to zero. No change.

I noticed that when I check the Firmware EEPROM settings, they appear in the log. Here is a copy of the log. Easier than a screen capture. Let me know if this is OK. Also, after changing values in the Firmware EEPROM settings, the changes are with immediate effect, yes?

Again, thanks for listening. Today is the day the solution to my problem will be found.

Firmware EEPROM Settings:
10:41:45.026 : EPR:2 75 250000 Baudrate
10:41:45.057 : EPR:3 129 0.000 Filament printed [m]
10:41:45.088 : EPR:2 125 0 Printer active
10:41:45.119 : EPR:2 79 1800000 Max. inactive time [ms,0=off]
10:41:45.150 : EPR:2 83 0 Stop stepper after inactivity [ms,0=off]
10:41:45.197 : EPR:3 11 80.0000 Steps per mm
10:41:45.260 : EPR:3 23 300.000 Max. feedrate [mm/s]
10:41:45.260 : EPR:3 35 120.000 Homing feedrate [mm/s]
10:41:45.306 : EPR:3 39 35.000 Max. jerk [mm/s]
10:41:45.369 : EPR:3 133 0.000 X home pos [mm]
10:41:45.416 : EPR:3 137 0.000 Y home pos [mm]
10:41:45.478 : EPR:3 141 0.000 Z home pos [mm]
10:41:45.540 : EPR:3 145 250.000 X max length [mm]
10:41:45.540 : EPR:3 149 250.000 Y max length [mm]
10:41:45.540 : EPR:3 153 370.000 Z max length [mm]
10:41:45.540 : EPR:3 59 1850.000 Acceleration [mm/s^2]
10:41:45.540 : EPR:3 71 3000.000 Travel acceleration [mm/s^2]
10:41:45.618 : EPR:3 881 269.000 Diagonal rod length [mm]
10:41:45.712 : EPR:3 885 126.850 Horizontal radius [mm]
10:41:45.806 : EPR:1 891 80 Segments/s for travel
10:41:45.915 : EPR:1 889 225 Segments/s for printing
10:41:45.915 : EPR:1 893 0 Tower X endstop offset [steps]
10:41:45.915 : EPR:1 895 61 Tower Y endstop offset [steps]
10:41:45.915 : EPR:1 897 140 Tower Z endstop offset [steps]
10:41:46.024 : EPR:3 901 210.000 Alpha A(210):
10:41:46.024 : EPR:3 905 330.000 Alpha B(330):
10:41:46.024 : EPR:3 909 90.000 Alpha C(90):
10:41:46.024 : EPR:3 913 0.000 Delta Radius A(0):
10:41:46.024 : EPR:3 917 0.000 Delta Radius B(0):
10:41:46.024 : EPR:3 921 0.000 Delta Radius C(0):
10:41:46.024 : EPR:3 808 39.910 Z-probe height
10:41:46.024 : EPR:3 812 2.000 Z-probe speed
10:41:46.024 : EPR:3 840 150.000 Z-probe x-y-speed
10:41:46.024 : EPR:3 800 0.000 Z-probe offset x
10:41:46.024 : EPR:3 804 0.000 Z-probe offset y
10:41:46.024 : EPR:3 816 100.000 Z-probe X1
10:41:46.024 : EPR:3 820 20.000 Z-probe Y1
10:41:46.024 : EPR:3 824 160.000 Z-probe X2
10:41:46.040 : EPR:3 828 170.000 Z-probe Y2
10:41:46.040 : EPR:3 832 20.000 Z-probe X3
10:41:46.040 : EPR:3 836 170.000 Z-probe Y3
10:41:46.040 : EPR:0 880 0 Autolevel active (1/0)
10:41:46.040 : EPR:0 106 1 Bed Heat Manager [0-3]
10:41:46.040 : EPR:0 107 255 Bed PID drive max
10:41:46.040 : EPR:0 124 80 Bed PID drive min
10:41:46.040 : EPR:3 108 87.860 Bed PID P-gain
10:41:46.040 : EPR:3 112 3.010 Bed PID I-gain
10:41:46.040 : EPR:3 116 641.820 Bed PID D-gain
10:41:46.040 : EPR:0 120 255 Bed PID max value [0-255]
10:41:46.040 : EPR:3 200 92.400 Extr.1 steps per mm
10:41:46.040 : EPR:3 204 100.000 Extr.1 max. feedrate [mm/s]
10:41:46.040 : EPR:3 208 45.000 Extr.1 start feedrate [mm/s]
10:41:46.040 : EPR:3 212 6500.000 Extr.1 acceleration [mm/s^2]
10:41:46.040 : EPR:0 216 1 Extr.1 heat manager [0-3]
10:41:46.040 : EPR:0 217 205 Extr.1 PID drive max
10:41:46.040 : EPR:0 245 60 Extr.1 PID drive min
10:41:46.040 : EPR:3 218 31.3600 Extr.1 PID P-gain/dead-time
10:41:46.055 : EPR:3 222 2.1800 Extr.1 PID I-gain
10:41:46.055 : EPR:3 226 112.9000 Extr.1 PID D-gain
10:41:46.055 : EPR:0 230 255 Extr.1 PID max value [0-255]
10:41:46.055 : EPR:2 231 0 Extr.1 X-offset [steps]
10:41:46.055 : EPR:2 235 0 Extr.1 Y-offset [steps]
10:41:46.055 : EPR:1 239 3 Extr.1 temp. stabilize time
10:41:46.055 : EPR:1 250 150 Extr.1 temp. for retraction when heating [C]
10:41:46.118 : EPR:1 252 0 Extr.1 distance to retract when heating [mm]
10:41:46.180 : EPR:0 254 255 Extr.1 extruder cooler speed [0-255]
10:41:46.180 : EPR:3 246 0.000 Extr.1 advance L [0=off]

[wcogen]

Also, I put the v2 back the way it should be, XYZ steppers and endstops all plugged into their respective sockets. No longer in switcharoo mode.

[DavidF]

the x y z length should be set the same at the 373.92. set them to that then give G28. Then go G0 Z5 F3500. and see if your straightened out. Use the max lengthe to set the Z height for te printer. I think the end stop off sets should be set to 000 also?? Dunno dont have that on my settings....

[guanu]

if you can do me a favor.. this isnt the easiest, but it can be done without taking the belt off, just loosen the idler and give the belt slack... take the Y motor off, then take the pulley off... use a sharpie to mark one tooth.. then count the number of teeth around till you get back to the sharpie mark.. if you get 18, let us know and we can get you a new pulley... they should be 20 tooth pulleys (and it will still be marked 20t on the pulley)... we came across some that were 18 tooth and marked 20, and that is usually the cause... check that for us and get back with us if that is the case... but it looks like thats the problem.

Guanu

[wcogen]

18 teeth. I count 18 teeth. And it is marked 20t.
Relieved. I'm relieved. If you follow this thread you'll see that I've been struggling with this for days. I have mixed emotions about this. You know what mixed emotions are? Watching your mother-in-law drive your new Mercedes off a cliff! I'm relieved that my problem is solved. I'm relieved it wasn't something really dumb that I did. I'm looking forward to getting the new pulley overnighted to me and having a selection of gifts in the box with it as a way for SeeMeCNC to get back in my good graces.

What's next? Do you contact me for shipping info?

And, a big thank you to all who took the time to help me try and find this problem. Remember, no good deed goes unpunished.

[wcogen]

Also, I don't understand what I saw. If the X and Z motors have 20 teeth pulleys, doesn't mean that those Skates would move further than than the Y Skate per motor revolution? What I saw was the Y Skate moving further than the X and Z Skates. Looking at the Z tower, the nozzle was too far to the left?

[wcogen]

Last night I printed my PEEK Fan Shroud. Changing the Y tower stepper pulley wasn't too bad really. I did have to modify a screw driver with a long thin shaft to fit the stepper motor mounting screw that was 'almost' unreachable. Once replaced, my MAX v2 worked as expected. After calibration, my first print went well.

And, I figured out why the Y Skate was traveling further than the X and Z Skates with a smaller pulley. The 18 tooth pulley has a different pitch than the 20 tooth pulley. The belt fits nicely into the 20 tooth pulley but rides above the teeth on the 18 tooth pulley. That changes the effective diameter of the 18 tooth pulley to be larger than the 20 tooth pulley and, therefore, the belt travels further per each revolution of the motor(s). I discovered this while explaining the issue with my wife, a math major.

So far, other than the mis-marked pulley, my experience with the Rostock MAX v2 has been good. And, my SeeMeCNC dealer, Kevin at Computer Source in Inman, SC, has gone above and beyond supporting me. Kudos to him.

I'll close this thread by saying thank you to all who helped me during my build and first print.

Happy printing. See you around the forum.
Bill

[Kevinvandeusen]

glad you got her going! looking forward to seeing some awesome prints!!