RRF 3 Z home not triggering.

[joehsmash]

@fcwilt @dc42 has chimed in before to help.

i do not have levelling screws on my bed. its actually held to the y gantry with magnets that are epoxied to the bottom of the glass bed.

one of the future upgrades i have planned is to re design the y gantry supports to allow me to delete the magnets and add in a screw type adjustment.

but with that said, i have manually leveled and used metal shims that tto get all of the magnets to within 0.01 so the bed it self is level, just the zmotors arent and im not sure how to get the one driver for E0motor to come up or down.

i also just ordered a BLtouch, how ever with the design of my xcarriage its going to be a challenge getting that set up. but again i will likely need to reprint the carriage to get it to work as i want.

[jay_s_uk]

This applies to you
https://forum.duet3d.com/topic/16766/offset-for-dual-y-endstop/3
obviously you apply it to Z rather than Y. But you can adjust one of them (probably the one that reads 1.45) down by ~-0.65 so they are both at the same height.

[fcwilt]

For now can you couple the Z motors with a belt and use just one Z end stop switch?

With that you could manually adjust the relationship of the two Z lead screws using one of the motor pulleys but one adjusted they would stay in sync.

Frederick

[joehsmash]

@jay_s_uk thats great, i will most certainly try that out.

all though im not sure why the second motor is losing distance.

as i said before when i shoot the zheight up 50mm than back down the right one is off. so all though this would temporarily fix the problem (and i appreciate it) its not an ideal solution.

but it is a solution to one of my problems none the less

[joehsmash]

@fcwilt said in RRF 3 Z home not triggering.:

adjusted they would stay in sync.

i most certainly could rewire my printer to have both of the z axis work off the same stepper, i though it was ideal in RRF3 to have each z as an individual motor, (its easier on the board as well as easier on the parts)

[jay_s_uk]

@joehsmash It could be that your endstops aren't at exactly the same height. I know that doesn't explain the difference of 0.15 when backing off 50mm but it would explain the difference between 1.45mm and 0.95mm

[JoergS5]

@joehsmash To use one Z stepper only is a good idea. Additionally you may have a mechanical problem with one side. It is easier to discuss this by seeing images from your construction, especially the connection between stepper and spindle/belt/whatever and how the bed/gantry is moved.

[joehsmash]

@jay_s_uk this is a certain possibility. the way my gantry works is the lead screws are embeded into the x gantry, there is a clamp that holds the switches onto the underside of the gantry which is clamped onto the lead screws.

so to adjust them would put the entire weight of the gantry on one little screw which would move in the long run

[joehsmash]

@JoergS5

this is the construction of my printer

[JoergS5]

First I wonder why you have three cables at your endstops, because my are looking the same and two cables are sufficient: using left and right means closed when not active and they open when endstop is triggered.

I would expect some pressure between left and right, so if you change direction of one Z side, it will stuck at the trapezoid spindle. First test would be to let fixed the spindle and the linear guide on one side (let's say it is left), but loose the other (right) side a bit (trapezoid screw and linear guide) (like a fixed bearing and a loose bearing at CNC machines for installing ball bearings). So the right side can move a bit horizontally if necessary.

[joehsmash]

@JoergS5 i just soldered on ones for the no, nc and common because i didnt want to have to dissasemble them to solder them if i ever needed to in the future, both of the NO contacts are disconnected underneith

[JoergS5]

@joehsmash ok I understand and it's ok of course.

[joehsmash]

@JoergS5 the construction of the lead screws are integrated into the stepper, so theres no adjustments that can be made.

i can how ever manually adjust where the screw lays on the endstop clamp but for reasons i have posted before i wouldnt put all that pressure onto the one little tiny screw.

[JoergS5]

And I cannot see exactly that this green connector is and how it is connected to the stepper, can you make a close picture of it please?

[joehsmash]

@JoergS5 the green your looking at it just tape, so i can visualize if each of the stepper is moving.

i use it to verify if the mesh is working or not.

[joehsmash]

[JoergS5]

So the trapezoid spindle is directly inside the stepper? Or is there a coupler between?

[joehsmash]

@JoergS5 these are integrated lead screws. there are no couplers.

[JoergS5]

Ok I understand now.

Now what do you mean by weak screw where you don't want the whole load on. Which "tiny little screw"?

[joehsmash]

@JoergS5