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Strange behaviour with HOME_SEARCH_VEL direction #23

Open ArcEye opened 6 years ago

ArcEye commented 6 years ago

Issue by gorf25 Thu Apr 30 00:46:35 2015 Originally opened as https://github.com/machinekit/machinekit/issues/601

Bas De Bruijn asked me to open a new issue and to refer to this google groups posting

lineardetla calibration i have not been able to calibrate the printer

the link to group

https://groups.google.com/forum/#!topic/machinekit/MRTmRa3saX0

thanks gary

ArcEye commented 6 years ago

Comment by luminize Sat May 2 08:58:34 2015

I experienced the following. While the SEARCH_HOME_VEL was positive, while homing the direction was negative.

Negating the HOME_SEARCH_VEL and HOME_LATCH_VEL to a - and a + which should be incorrect, but results in the right homing direction (up)

Then the next day, when I started up the config, the homing still went down. But now that the HOME_SEARCH_VEL in the ini file is negative, this is to be expected. So setting these to the correct values again + search_vel and - latch_vel gives the correct behaviour.

My system consists of a BBB rev C, BeBoPr-Bridge, recent build with commit 6ca42cfeb3de5c770041eb0c53a0fc931d7a3313

ArcEye commented 6 years ago

Comment by luminize Sat May 2 08:58:59 2015

pressed wrong button

ArcEye commented 6 years ago

Comment by machinekoder Sat May 2 11:27:16 2015

Does the build-plate move or the printing head? Sometimes the direction just looks wrong.

ArcEye commented 6 years ago

Comment by gorf25 Sat May 2 13:55:55 2015

the print head its a kossel delta printer

ArcEye commented 6 years ago

Comment by luminize Sun May 3 11:00:44 2015

@gorf25 can you verify (and only this, don't look at scale and direction) that:

screen shot 2015-05-03 at 12 30 37

ArcEye commented 6 years ago

Comment by gorf25 Sun May 3 18:24:50 2015

HOME_SEARCH_VEL in your ini file is positive, like +10 HOME_LATCH_VEL in your ini file is negative, like -1 while homing the joints shows the negative pos and moves towards the bed numbers decreasing,

HOME_SEARCH_VEL in your ini file is positive, like -10 HOME_LATCH_VEL in your ini file is negative, like +1 while homing the joints shows the positive pos and moves towards home joints being positive and increasing like your picture

ArcEye commented 6 years ago

Comment by luminize Sun May 3 21:12:59 2015

well, that's obviously wrong behaviour IMO

ArcEye commented 6 years ago

Comment by luminize Sun Jun 7 18:44:01 2015

I captured a situation where the search velocity is plain wrong. This time in 2 of the 3 joints. All should go up as per the INI file.

screen shot 2015-06-07 at 20 31 44

for all joints I have these ini values.

HOME_SEARCH_VEL = 30
HOME_LATCH_VEL = -1
ArcEye commented 6 years ago

Comment by luminize Sun Jun 7 18:58:18 2015

next step I did: changed the for the joints 0 and 2 the following:

HOME_SEARCH_VEL = -30
HOME_LATCH_VEL = 1
HOME_SEARCH_VEL = 30
HOME_LATCH_VEL = -1

I'm flabbergasted.

Will report back if I see something which triggers this.

ArcEye commented 6 years ago

Comment by darenschwenke Mon Jun 8 00:27:43 2015

verified your end stop signals are good before you started homing? Noticing you have ~30:1 difference there.

On Sun, Jun 7, 2015 at 2:58 PM, Bas de Bruijn notifications@github.com wrote:

next step I did: changed the for the joints 0 and 2 the following:

HOME_SEARCH_VEL = -30HOME_LATCH_VEL = 1

  • pressing the home button moves all the joints up, with positive numbers in the preview window
  • then homing didn't stop at the endswitch
  • power down
  • e-stop

  • e-stop clear

    power up

    and then the joints 0 and 2 start moving down when I re-home.

    exit Machinekit

  • change the ini values again to the correct ones

HOME_SEARCH_VEL = 30HOME_LATCH_VEL = -1

  • start Machinekit
  • homing works as it should

I'm flabbergasted.

Will report back if I see something which triggers this.

— Reply to this email directly or view it on GitHub https://github.com/machinekit/machinekit/issues/601#issuecomment-109788461 .

ArcEye commented 6 years ago

Comment by luminize Mon Jun 8 05:13:25 2015

good observation! If that were the problem it would be an embarrassing one :) I moved my board, and come to think of it, these exact joints were disconnected. I'll have to do some more rewiring so I'll be extra careful to check the endstops.

ArcEye commented 6 years ago

Comment by gorf25 Wed Jun 10 00:48:56 2015

I tried to duplicate what you have done to fix but haven't been successful still have to have set HOME_SEARCH_VEL = -30