Giant Delta printer Slow Homing issue.

jay_s_uk

are your steps per mm correct?
does it definitely move the distance requested?
I can tell you have external drivers connected.
What size pulleys/belts have you got installed and what number of steps do you have set on your external drivers?

sozkan

@dc42 Thank you for your prompt reply.
I have tested individually.
first trial: All motors go down -40 mm. But it supose to be -100 it was smooth but wrong indeed.

G1 H2 X-100 Y-100 Z-100 F1000

Second trial: for a single axis which is the main problem. it did not even run 1 mm. it was a kind of noisy move.

G1 H2 X100  F1000

sozkan

@jay_s_uk According to my calculation correct, but seems like some problem.

I set the external driver for 3200 steps/revolution.
Using duet stepper breakout board.
Pulley 14 teeth at 10 mm pitch it should be 140 mm per revolution. -
Step / mm

M92 X22.86 Y22.86 Z22.86 E274.00

As I mentioned above, just tested if all motors run together

G1 H2 X-100 Y-100 Z-100 F1000

40 travel at Z ( As Delta configuration). But it supposes to run 100 mm.

second trial was only "X" axis. It was driven with nosy sound and not even a few mm run.

Can it be a micro-stepping issue? Because since they have their own setup, these motors do not need micro-stepping. But it still does not explains noisy moves when moving single-axis.

jay_s_uk

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

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

what I have just noticed is you are setting the timings for drives 0, 1, 2 and 3 but mapping 5, 6, 7 and 8.

I guess you need to change your M569 commands to use the same drive numbers. i.e.

M569 P5 S1 T3:3:5:0                                        ; physical drive 0 goes Forward
M569 P6 S1 T3:3:5:0                                        ; physical drive 1 goes Forward
M569 P7 S1 T3:3:5:0                                        ; physical drive 2 goes Forward
M569 P8 S1 T3:3:5:0                                        ; physical drive 3 goes Forward

sozkan

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

etting the

Since I am using external driver, the expansion board mapping is 5(Extruder) 6,7,8,(X,Y,Z) so it is running like that. For the Extruder slightly different driver, manufacturer recommends "M569 PXXX SXXX R1 T3:3:5:0"
So I use the similar parameter for all drives. Should I do anything with T parameters?

jay_s_uk

yes, but look at your P values in M569
you're setting those requirements for the built in drives, not the external drives.
change your M569 command as suggested

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.