**RESOLVED** :) homing Y errors

[yolk]

hi

when i start the machine and press cycle start:
1: Z axis homes correctly
2: X axis homes correctly

3: Y axis moves slowly making bizarre noise.. then it either
- homes without traveling the whole distance to the limit switch (several inches before it even touches the limit switch)
- or it homes without traveling the whole distance, then stating an error (something like there is a difference in the new home to the old - accept Y/N - contact centroid)

before homing i can move the axis
also i can move the axis after homing (then they run faster - why?)

i bought the motors pre-cabled.
there is no slip on the ballscrew and motor - all tightly screwed.

so what can be the causes?
wrongly tuned motors?
do i have to uncouple the y axis motor and turn the ballscrew a bit so it its in a different position?

thanx for narrowing it down for me

best
david

[yolk]

when i do the homing with the homing function - one axis after the other - it works

so i'm clueless why it does not work at the beginning with cycle start

[CNC-Global]

Can you please confirm you are using mac3 or CNC10

[CNC-Global]

If you are using CNC10 or CNC11 following step should be checked

1) Wiring of the Index pulse i.e Z and /Z go in F1(setup)--->F3(config)---->F4(PID) you see the following screen

Now index pulse should come once in a revolution if it show Z* constantly then you must swap your index pulse wires i.e Z---->/z
and /z--->z

Please Set parameter 148 to 1 will enable fast Jog before homming

[yolk]

dear cnc-global

i'm on a cnc10

you are talking about Z axis, although the homing of my Y axis has quirks..guess it's a mixup



i did go into the PID setup

the axis do NOT show an asterisk * constantly when i move the axis.

if i understand you correctly the asterisk should blink once per revolution.

what i find bizarre is:
when i move my axis, all of them, the asterisk blinks. but not regularly..it seems to skip its beat, although if i move the table at a constant speed it should blink at a constant beat, right?

if you talk about the index pulse wires..are you talking the physical wires on the motor encoder? because i bought the motors new prewired - i'd be shocked if ajax made an error in wiring these.

i'm so close - only the y axis has to home automatically and i'm ready to go, but i'm afraid to do something wrong as i already fried one servo drive once

thank you for additional help

[CNC-Global]

Ya i m sorry by mistake i typed Z-axis
IF Motors are prewired then their is no issue for wiring i m 100% sure

ok Now check the Limit switch page
F1(set)--->F3(config)--->F2(Mach)---->F2(Motor)

Kindly check the Home Limit switch set properly
Also which direction machine will home M92/y or M91/y

It seems to me your home switch set on zero or any other value of the input that is apparently low

Kindly update

[yolk]

i will check again..although i think i had this covered in my last post.
http://www.ajaxcnc.com/ajaxbb/viewtopic.php?f=20&t=299

i mean if it is wrong why would homing via the homing setup (individual axis) work but not after startup?

it's like the motor crawls in the right direction (-Y) but stops after an inch before even touching the limit switch wich is 5 inches away

[yolk]

homing sequence is

1. M92/Z
2. M26/Z
3. M91/X
4. M26/X
5. M92/Y
6. M26/Y

[CNC-Global]

plz send me the picture of the screen of limit switch


F1(set)--->F3(config)--->F2(Mach)---->F2(Motor)

[yolk]

it's still like this: