Need Help with BL Touch Set up

massynrt · 13 Apr 2020, 06:45

You need to configure the Z Endstop to use the Z-probe. You only configured the Probe.

Add this to your endstop section.

M574 Z1 S2 ; configure Z-probe endstop for low end on Z

Shamusseven · 13 Apr 2020, 12:49

@massynrt said in Need Help with BL Touch Set up:

M574 Z1 S2 ; configure Z-probe endstop for low end on Z

That made some change when I hit Home Z but my probe still is not deploying plus it looked like the z motor was going down (meaning the bed was lowering and not raising as it should) and not up to probe. Sending codes M401 and M402 do nothing.
For the z motor it as if I have it reversed BUT when I manually click a negative number (Z -5) to move the bed, it raises as I thought it should. Positive number (Z +5) it goes down. If that is wrong then I know the fix. But if that movement is correct then I do not know why homing is reversed. .

DIY-O-Sphere · 13 Apr 2020, 13:22

@Shamusseven
Remove "M307 H3 A-1 C-1 D-1" from config.g
Also the "^" from zprobe.in

DIY-O-Sphere · 13 Apr 2020, 13:28

@Shamusseven said in Need Help with BL Touch Set up:

if that movement is correct then

The movement is correct...That is the dive height to get clearance for the X and Y move.

DIY-O-Sphere · 13 Apr 2020, 13:35

@Shamusseven said in Need Help with BL Touch Set up:

config.g deployprobe.g homey.g retractprobe.g homeall.g

retractprobe.g
M280 P0 S90

depoyprobe.g
M280 P0 S10

In the home.g G30 is missing please generate this file new with the config tool....

Shamusseven · 13 Apr 2020, 15:32

@DIY-O-Sphere thank you for the help. I removed the items on your first reply. The m307 I thought was needed to free up my heater 3 pin. The ^ I got from another post. Ran it with and without and did not seem to make any difference.
I am not sure I follow how I am to make the home.g file. (G30). And yes I get that the bed lowers at the start of a homing action. And it does. But then it lowers again when it should to be moving up and looking for the probe (which is still not deployed). Plus the z movement sounds horrible. Not sure how to upload a video but I have one to share of what home z does.

DIY-O-Sphere · 13 Apr 2020, 15:47

@Shamusseven
You can create the files here.
https://configtool.reprapfirmware.org/Start

Shamusseven · 13 Apr 2020, 15:51

I guess my concern is I created all the files using the configurator tool to begin with. So what do I do differently to get the home.g file created.

DIY-O-Sphere · 13 Apr 2020, 16:20

@Shamusseven
I am not shure what was going wrong. Some of the attached files are from the RRF2 version.

You homeall.g should look like this:

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Sat Apr 11 2020 15:51:05 GMT-0500 (Central Daylight Time)
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G1 H1 X-335 Y-335 F3000 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 H2 X5 Y5 F6000 ; go back a few mm
G1 H1 X-335 Y-335 F300 ; move slowly to X and Y axis endstops once more (second pass)
G90 ; absolute positioning
G1 X150 Y150 F6000 ; go to first bed probe point and home Z
G30

; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning

DIY-O-Sphere · 13 Apr 2020, 16:38

@Shamusseven
Please check the offset of the probe...
G31 P500 X170 Y180 Z2.5
Isn't it mounted in the near of the nozzle?

Shamusseven · 13 Apr 2020, 16:48

so is that to be the placement where the BL touch physically is compared to the Nozzel? because yes it is just a few mm to the rear of the nozzel and about 37mm to the left of the nozzel.
by the way, After making thos changes, I still do not seem to get my probe to deploy excet at power on.

here are my configs after changes. homeall (1).g config (1).g

Shamusseven · 13 Apr 2020, 16:55

Plus another thing I noticed is my z motors do not seem to be fully synced. The 2 motors go the same direction But the left side starts just a fraction sooner than the right side. What is causing that?

DIY-O-Sphere · 13 Apr 2020, 17:21

@Shamusseven said in Need Help with BL Touch Set up:

Plus another thing I noticed is my z motors do not seem to be fully synced. The 2 motors go the same direction But the left side starts just a fraction sooner than the right side. What is causing that?

Check if the wiring is that way. Especially if you are using extension cables.

Shamusseven · 13 Apr 2020, 18:01

I can look in a bit but it’s wired using the same cables as the original board. And it’s not that they are moving in an opposite way than the other. Just a delay.

DIY-O-Sphere · 13 Apr 2020, 18:06

@Shamusseven

@Shamusseven said in Need Help with BL Touch Set up:

here are my configs after changes. homeall (1).g config (1).g

https://forum.duet3d.com/topic/14183/help-with-new-config-g?_=1586795305711
Try to put "^" back. I will never get it....

Shamusseven · 13 Apr 2020, 18:20

No change. But yeah. That is where I saw where I needed that. This is so difficult because the process from different versions are different. Frustrating.

But I still do not have my probe deploying

radekzl · 13 Apr 2020, 18:30

Hello,
I have same problem two days ago:

https://forum.duet3d.com/topic/15549/bl-touch-setting-on-reprap-firmware-3-0

In this topic is part of my config.g which is OK.

And check sd card if you do not have on sd card file iap4e.bin and delete it.

Shamusseven · 13 Apr 2020, 18:30

And I guess the difference in the z motors is just in the transition from the first probe test (which still goes the opposite way) to the second, slower or I assume more accurate measurement. Just at that moment when the bed goes back down for the slower measurement, the left side start sooner. It appears the equal back up so not sure it’s an issue or not.

Phaedrux · 13 Apr 2020, 18:48

sorry you're having a bit of trouble. I think part of the problem is that you're using RRF3 but you've either gotten config files for using 2.x version or used some documentation for 2.x version.

First

@Shamusseven said in Need Help with BL Touch Set up:

because yes it is just a few mm to the rear of the nozzel and about 37mm to the left of the nozzel.

G31 P500 X170 Y180 Z2.5

You must change the X and Y values to match the distance between the nozzle and the BLtouch. Also change from P500 to P25.

Here's an example of how to measure it: https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+5:+Upgrades/54#s230

Once you have the probe working, you will need to calibrate the Z trigger height, also described in that link.

You must change your deploy and retract macros to use P0 instead of P3. P0 reserves to servo index 0, which you created with the M950 command in config.g. In 2.x versions the P3 would have referred to the heater 3 pin directly.

M280 P0 S90 I1; retract BLTouch

M280 P0 S10 I1; deploy BLTouch

Since you are using the BLtouch with a DuetWifi, you will also need the I1 to invert the signal.

Your homeall looks fine.

AS for the Z axis direction, 0 is where the nozzle is touching the bed. 400 is when the bed is farthest away from the nozzle. Negative Z movement moves the nozzle and bed closer together, positive Z movement moves them farther apart. If that's not what's happening now, you'll need to change the direction of rotation for the motors on the Z axis.

Shamusseven · 13 Apr 2020, 18:57

@radekzl I removed this file and now I can’t get anything to work.