Giant Delta printer Slow Homing issue.

sozkan

I have changed as you suggested it did not work!
working one as previous :

; Drives
M569 P0 S1 R1 T3:3:5:0                                        ; physical drive 0 goes Forward
M569 P1 S1 R1 T3:3:5:0                                      ; physical drive 1 goes Forward
M569 P2 S1 R1 T3:3:5:0                                       ; physical drive 2 goes Forward
M569 P3 S1 R1 T3:3:5:0                                        ; physical drive 3 goes Forward
M584 X6 Y7 Z8 E5                                   ; set drive mapping

By the way, I was played a bit on/off side on dip Switches on the stepper driver like on and off.
Thankfully one of the issues is working correctly on only for :

G91                         ; relative positioning
G1 H2 X-100 Y-100 Z-100 F1000      ; go down a few mm

with this code going -100 mm exactly as per steps /mm

But if ;

G91                         ; relative positioning
G1 H2 X100 F1000      ; go Up 100 mm back

it is 12 mm only IT seems to me during the calibration considering delta kinematic. but not running other axes.

I am uploading a youtube video on how it behaves. I will share it as soon as upload finalize.

As a conclusion, if one or two of the axis motors hit limit switches, third axis motor slow down some reason, try to reach some level and board limit switch signals all of them get on and off for a second. I have noticed during the capture.

dc42

@sozkan said in Giant Delta printer Slow Homing issue.:

Pulley 14 teeth at 10 mm pitch it should be 140 mm per revolution.

Are you really using belts with 10mm tooth pitch?

sozkan

@dc42 Hi
Yes, it is 10 mm pitch and revolution 140 mm I have just confirmed steps/mm was correct. During the homing, as soon as the first or second limit switch engaged, the last motor slow down almost 8 times. and homing failed. One or a few pass then homing success.

This is the video about the issue.
Link: Youtube video of Giant Delta Testing and issues.

dc42

Looking at your video, there is no way that the belts you are using have 10mm pitch (distance between teeth). They look like 2mm or 3mm to me.

Veti

@sozkan said in Giant Delta printer Slow Homing issue.:

External 12NM Large Stepper driver and motors used with Stepper Breakout Board v1.1

if you are investing that much into the printer, why not get a duet 3 and drive those motors directly?

Phaedrux

@sozkan said in Giant Delta printer Slow Homing issue.:

Yes, it is 10 mm pitch

10mm wide belts maybe?

sozkan

@dc42 it is actually 10 mm. Because it is 3 meter high that's looks small.

sozkan

@Veti Actually We have purchased the electronic hardware last year. We had some problem to fin suitable place with in the university. Finally started. But we may upgrade. if really makes difference.

sozkan

@Phaedrux width of the belt 25 mm.

Phaedrux

Well if you're certain that tooth to tooth distance is 10mm then I guess that's that.

sozkan

@Phaedrux said in Giant Delta printer Slow Homing issue.:

Well if you're certain that tooth to tooth distance is 10mm then I guess that's that.

I have confirmed twice also in the video once, step/mm calculation is right according to the 10 mm pitch.
The Actual problem is on the last axis homing.
I will try to setup like a cartesian machine and try homing again.

dc42

Please can you show in a video how you measured the tooth pitch to be 10mm.

Dougal1957

@sozkan said in Giant Delta printer Slow Homing issue.:

@Phaedrux said in Giant Delta printer Slow Homing issue.:

Well if you're certain that tooth to tooth distance is 10mm then I guess that's that.

I have confirmed twice also in the video once, step/mm calculation is right according to the 10 mm pitch.
The Actual problem is on the last axis homing.
I will try to setup like a cartesian machine and try homing again.

can you also move the 50mm like you did set your callipers to that and then show us the callipers against the belt teeth if you move 50 mm then we should only see 5 teeth if the belts are truly 10 mm pitch (Which I doubt)

Veti

as you can see we are all very interested, as we have not seen a belt like that

the white belts tend to have steel cores. they tend to break especially with 180 degree turns.
can you please post a link to the belts used.

sozkan

@Dougal1957
Hi, here is the link of the video of breef info about components and measurement proof of belt teeth .
Youtube Link: for the homing calibration and teeth

sozkan

This post is deleted!

sozkan

@Veti said in Giant Delta printer Slow Homing issue.:

as you can see we are all very interested, as we have not seen a belt like that

the white belts tend to have steel cores. they tend to break especially with 180 degree turns.
can you please post a link to the belts used.

First of all thanks for the concern. There is steel fiber, the Smaller the pulley, the lesser the life span. But 14 teeth hopefully not a big problem.
Here is the link information about belt : Belt info: https://www.maedler.de/Article/16470000

dc42

Thanks for confirming the belt pitch; I am sorry that I doubted you.

@sozkan said in Giant Delta printer Slow Homing issue.:

I have changed as you suggested it did not work!
working one as previous :

; Drives
M569 P0 S1 R1 T3:3:5:0                                        ; physical drive 0 goes Forward
M569 P1 S1 R1 T3:3:5:0                                      ; physical drive 1 goes Forward
M569 P2 S1 R1 T3:3:5:0                                       ; physical drive 2 goes Forward
M569 P3 S1 R1 T3:3:5:0                                        ; physical drive 3 goes Forward
M584 X6 Y7 Z8 E5                                   ; set drive mapping

Those M569 commands are definitely wrong. Your external drivers are P5 P6 P7 P8 as @jay_s_uk said. This is probably why the motors move the correct amount when all 3 are moving, but not when just one is moving. That in turn explains the slow down when one carriage reaches the endstop, and the failure to complete homing (because the other carriages are not travelling as far as they should).

sozkan

@dc42 said in Giant Delta printer Slow Homing issue.:

P5 P6 P7 P8

Hi, Thank you for concerning and valuable input.
I have changed again M569 values as you mentioned. Motor did not moved. But they became motors off stage. I mean motor enable signal reversed, So motors free while homing but none of them moving.
here is the current code : Do I need to change any other code relative to the Drive P values?

; Drives
M569 P5 S1 R1 T3:3:5:0                                       ; Extruder drive 0 goes Forward
M569 P6 S1 R1 T3:3:5:0                                     	 ; X:A drive 1 goes Forward
M569 P7 S1 R1 T3:3:5:0                                       ; Y:B drive 2 goes Forward
M569 P8 S1 R1 T3:3:5:0                                       ; Z:C physical drive 3 goes Forward
M584 X6 Y7 Z8 E5                                  			 ; set drive mapping

Did I miss anything ? I am going to reverse Drivers Enable signal input right now for try. I wonder if that one is the problem.
Thanks.

jay_s_uk

That's a good sign as it means your drivers are actually being set by the firmware now.
You can change whether the motors are active high or active low using the R value. So it seems you need them all on active low. Change R1 to R0 on each driver