Big Delta, Marlin or Arduino percision limitation? September 30, 2017 06:20PM |
Registered: 9 years ago Posts: 17 |
Re: Big Delta, Marlin or Arduino percision limitation? October 01, 2017 01:57PM |
Registered: 8 years ago Posts: 165 |
Re: Big Delta, Marlin or Arduino percision limitation? October 01, 2017 05:01PM |
Registered: 9 years ago Posts: 17 |
Quote
LVD
Did you calibrate the tower angle corrections?
Re: Big Delta, Marlin or Arduino percision limitation? October 01, 2017 07:01PM |
Registered: 10 years ago Posts: 14,672 |
Re: Big Delta, Marlin or Arduino percision limitation? October 01, 2017 11:39PM |
Registered: 9 years ago Posts: 483 |
Re: Big Delta, Marlin or Arduino percision limitation? October 02, 2017 10:37AM |
Registered: 9 years ago Posts: 17 |
Quote
dc42
The people I know of who have built large deltas have all used 32-bit electronics. This isn't surprising, because large deltas are not cheap to build accurately, and it hardly makes sense to spoil an expensive machine by using budget electronics.
Many of the experts on delta printers hang out at [groups.google.com].
Re: Big Delta, Marlin or Arduino percision limitation? October 02, 2017 10:39AM |
Registered: 9 years ago Posts: 17 |
Quote
etfrench
What results do you get manually moving the arms to the max position?
Did you calibrate it at the maximum distance from each tower?
Are the arms less than 20 degrees from parallel when they are at maximum distance? The carriage for arms 355mm long should be about 120mm above the effector for a 20 degree angle. Longer arms may solve your problem.
Re: Big Delta, Marlin or Arduino percision limitation? October 02, 2017 01:03PM |
Registered: 10 years ago Posts: 732 |
Re: Big Delta, Marlin or Arduino percision limitation? October 03, 2017 04:36AM |
Registered: 9 years ago Posts: 17 |
Quote
hercek
You have probably slightly wrong delta radius and probably also diagonal rod length. Errors in these two can partially compensate each other and the imprecision can appear only at your purple places: [forums.reprap.org]
If you do not want to buy 32-bit electronics just yet then you can try to get/make a Z-probe a calibrate using this: [github.com]
Edit: By the way. The core problem of your machine is definitely not your 8-bit electronics. Your problem is most likely only a wrong calibration. You can run even a huge delta with it with 8-bit electronics. The problem will be that you will not be able o run it quickly. Big delta means your firmware cannot work with integers (in steps) but it must use float data types (in mm). That slows things down (in addition to square roots which are slow without FPU). The primary thing which comes with 32-bit electronics is calibration directly in the firmware. Well and a bigger speed of course.
Re: Big Delta, Marlin or Arduino percision limitation? October 03, 2017 07:22AM |
Registered: 10 years ago Posts: 732 |
Re: Big Delta, Marlin or Arduino percision limitation? October 03, 2017 09:03AM |
Registered: 9 years ago Posts: 17 |
Re: Big Delta, Marlin or Arduino percision limitation? October 03, 2017 03:31PM |
Registered: 10 years ago Posts: 732 |