G28 z-axis on RAMBo not responding?

[bubbasnow]

First off i did a search on "G28" and i couldn't find anyone with my exact problem I'm experiencing.

Just got the Rostock Max assembled and starting doing ch 17 in the ver2 pdf

I configured my Repetier as closely to the books as possible, I am running ver 0.90c and the "connection" tab under printer settings is a little bit different

I get to the part where you enter g28, the x and y started going down and the z remained still.

I found and made true the inverse parts in "configuration.h", ran g28 again the x and y are now going up but the z still remains still

I swap x and z connection on the board, run g28 again and z and y go up and x remains still

Although my servos shipped with the connectors installed a checked, and with that switch test i performed it proves that the connectors themselves aren't the problem

I return the connectors back to the correct location on the board, and try to move z in "manual control" tab, i just get a bunch of humming and no motion.

I imagine i could test the second z motor port on the board but i am unsure where to configure that.

Thanks for the input in advance

[bubbasnow]

after talking to support today, they suggested that i swap z pin assignment with e1 pin assignment in "pins.h"

so i went down to the mega2560 and changed the following:
#define Z_STEP_PIN 33//35
#define Z_DIR_PIN 42//47
#define Z_MIN_PIN 10
#define Z_MAX_PIN 30
#define Z_ENABLE_PIN 25//27
#define Z_MS1_PIN 63//68
#define Z_MS2_PIN 64//67

#define E1_STEP_PIN 35//33
#define E1_DIR_PIN 47//42
#define E1_ENABLE_PIN 27//25
#define E1_MS1_PIN 68//63
#define E1_MS2_PIN 67//64

then I compiled and uploaded it, but it still doesn't work. do i need to change anything else where?

[bubbasnow]

When I mapped the z pins to e0 it worked.. Looks like something fishy is up with my Rambo.

[jmick]

Most problems with the stepper motors are a result of crimping improperly, unless you have a rachet type crimping tool you are
not going to get good tight crimps.


http://www.amazon.com/HT-225D-Cycle-Rat ... 3KK758WMXQ

[foshon]

Did you check the state of the z-axis limit switch? If it is showing made the axis will think it is home and not move.

[bubbasnow]

John tested my rambo, z was having issues. replacement board has been shipped to me.

Thanks All!

[m4r1n5]

Am I in the same boat? even when I switched with another motor, that motor did the same thing when I ran g28:

[youtube]http://www.youtube.com/watch?v=9PFLt1DlOd8[/youtube]

[bubbasnow]

when you connect to your rambo and repetier host software, are you able to run the extruded stepper motor back and forth to feed line?

I found that the e0 slot is a perfect way to test to see if your stepper motors for x,y,z are wired properly and have good connection.

In my case, just the z drive was not approaching the limit when i ran the g28 code, the x, y hit the limit and stopped like they were supposed to.

when i watch your video it doesn't even look like they make it all the way up.