Kossel calibration issues... January 17, 2016 06:38AM |
Registered: 8 years ago Posts: 30 |
Re: Kossel calibration issues... January 17, 2016 09:55AM |
Registered: 10 years ago Posts: 14,672 |
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Wiireless
So far I have managed to get the nozzel to move quite parallelly to the plate.
I brought the nozzle down to the lowest position and then moved it in the positive-X, negative-X and positive-Y directions and they all seemed to move rather flatly to me
However, when I try to move it in the Negative-Y direction, the nozzle would move into the printbed after a certain distance.
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Wiireless
Another issue I noticed is that sometimes, if I were to move the nozzle in the negative-X direction, it would move flatly with respect to the bed. But if I were to move it in the positive-X direction, it would start dragging against the bed. At any point if I were to move the nozzle in the negative-X direction again, the nozzle would once again be above the bed, even at points were it was previously dragging against the bed when moving in the positive-X direction.
Re: Kossel calibration issues... January 17, 2016 11:37PM |
Registered: 8 years ago Posts: 30 |
Re: Kossel calibration issues... January 18, 2016 03:46AM |
Registered: 10 years ago Posts: 14,672 |
Re: Kossel calibration issues... January 18, 2016 09:33AM |
Registered: 8 years ago Posts: 30 |
Re: Kossel calibration issues... January 18, 2016 04:43PM |
Registered: 10 years ago Posts: 14,672 |
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Wiireless
Hi David, okay I will try the calibration process again hopefully tomorrow and will update again.
However, I would just like to confirm if what I am doing to adjust the "tower position angle corrections" is correct. A.K.A changing the sin and cos values in Marlin_main
Cheers!
Re: Kossel calibration issues... January 18, 2016 05:37PM |
Registered: 10 years ago Posts: 293 |
Re: Kossel calibration issues... January 19, 2016 01:57AM |
Registered: 8 years ago Posts: 916 |
Re: Kossel calibration issues... March 03, 2016 02:49AM |
Registered: 8 years ago Posts: 30 |
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dc42
Wiireless,
If the problem gets worse with each change then something is clearly wrong. Did you select the correct firmware type in the calculator? Did you enter the correct initial values into the calculator? Are you entering the correct sign of the height error, i.e. positive where the nozzle is too high and negative where it is too low?
If you believe you are doing these things correctly, please try using the calculator in 4-point mode. Take measurements in front of each tower and at the centre, and compare what the calculator suggests with what you would do if following Minow's calibration guide. Post the results of both here.
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nebbian
Wiireless, I can pretty much guarantee that your steps per mm is off.
To measure this, home your machine, then get a set of calipers and place them so that they will measure the carriage movement precisely (one jaw against the frame, another against the carriage). Now move the carriage down by say 50mm using pronterface.
I can guarantee that your carriage won't move down 50mm. Calculate the percentage difference and adjust your firmware to suit.
Now home again, and you'll have to go through the whole calibration process again. But this time when you get it going flat towards the X, Y and Z towers, it will be flat everywhere else.
* I know because I had exactly the same issue
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WZ9V
Are you using Astrosyn dampers? I noticed that on my delta which uses them I had the belts too tight and that caused the X stepper to flex upwards and the belt to ride up on the lip of the pulley as it moved.
I'm hoping that once I fix this my weird calibration issues will be a thing of the past.
Re: Kossel calibration issues... March 20, 2016 12:06AM |
Registered: 8 years ago Posts: 8 |
Re: Kossel calibration issues... March 20, 2016 11:58PM |
Registered: 8 years ago Posts: 30 |
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BlasphemousBits
I personally got nowhere with minows guide. For one thing, there's some stuff in there that seems like it must be realy dated and obsolute. He seriously advises to avoid the EEPROM and instead go through the brain damage of editing configuration.h, recompiling, and re-uploading with each change?!?!! You have to be kidding!!
This video on the other hand really helped me out: [www.youtube.com]