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Best Tower Rotation Setting Yet
Posted: Tue Jul 26, 2016 3:08 pm
by Rolffeof6
Tried some additional tower rotations [Alpha A(210)] today centering around the previous best Alpha A of 210.4
The new champion on my machine is 210.425.
See the attached.
Re: Best Tower Rotation Setting Yet
Posted: Wed Jul 27, 2016 12:58 am
by Tincho85
Excuse my silly question, but what is this that you are sharing?
Could you elaborate for us mortal souls
Re: Best Tower Rotation Setting Yet
Posted: Wed Jul 27, 2016 1:07 am
by IMBoring25
He's measuring heights with a dial indicator every 15 degrees on a 100-mm circle to experimentally glean the changes in Z that result from changing the tower rotations in the firmware (the numbers after "Rostock 100 Alpha" in the first row of text).
I think you can probably get there from perturbing the kinematic equations (and calculate the error in X and Y as well) but I haven't gotten a chance to dig into those.
Re: Best Tower Rotation Setting Yet
Posted: Wed Jul 27, 2016 1:11 am
by Tincho85
IMBoring25 wrote:He's measuring heights with a dial indicator every 15 degrees on a 100-mm circle to experimentally glean the changes in Z that result from changing the tower rotations in the firmware (the numbers after "Rostock 100 Alpha" in the first row of text).
I think you can probably get there from perturbing the kinematic equations (and calculate the error in X and Y as well) but I haven't gotten a chance to dig into those.
That's cool, thank you.
Re: Best Tower Rotation Setting Yet
Posted: Wed Jul 27, 2016 1:55 pm
by Rolffeof6
Tincho85- I have 2 previous posts that provide detail and how I generate the charts. Both post titles begin with "Tower Rotation Study".
Re: Best Tower Rotation Setting Yet
Posted: Fri Jul 29, 2016 5:37 pm
by dc42
Have you tried plugging the height errors into my delta calibration calculator at
http://www.escher3d.com and letting it work out the tower angles that give you the least sum of the squares of the height errors?
Re: Best Tower Rotation Setting Yet
Posted: Tue Aug 02, 2016 7:57 pm
by Rolffeof6
dc42- Thanks for your post. I have not tried, but I certainly will.
Re: Best Tower Rotation Setting Yet
Posted: Fri Aug 05, 2016 10:30 am
by Rolffeof6
dc42- Tried your calibration calculator. Nozzle height/leveling problems are gone! Never printed as good as it is printing now.
I ran your calculator several times and each time made the suggested corrections. Since my dial indicator tilts the effector, I can't use it to make absolute adjustments- only relative measurements. After I entered the last set of parameter changes from our calculator, I then set all tower endstop offsets to zero and screwed the tower enstop screws in a full turn to prevent a possible bed crash. I then performed the paper tower endstop screw (height) adjustment per the owners manual. Voila.
Thank you for making your calculator available! It is a world saver! Anyone who has leveling issues should give your tool a try.
THANKS AGAIN!