Self made delta printer homing problem

Hey everyone,

I made my own 3D printer a few weeks ago.
I used a Ramps 1.4 Board with an Arduino mega.
I uploaded marlin to it and I can control the motors.
For explaining the problem I'm going to call the axis A,B and C.
But when I press home, all 3 axis move up. But when A hits his endstop, A and B stop moving and C moves to its endstop. When C hits his endstop its start moving down and A and B stay on the place where they stopped. C keeps moving until I hit the emergency stop
When I start homing and axis C hits his endstop first A and B stop moving and C starts moving down until I hit the emergency stop because otherwise it will break my printer.
The Axis A and B are connected to Y and Z, The axis C is connected to the X on the ramps 1.4 board

Does anyone know what I did wrong?
I looked through the firmware configuration files and can't fine anything strange.

Thank you in advance

Edited 2 time(s). Last edit at 09/26/2016 08:07AM by MisterCrazyBoy21.

you may defined z height to high. C probably trying to go home position.

thank you for your response.
but it happens when I want to home for the first time.
I set my home position to 500 mm, I don't know if there is any max for the z home in the software.

Edited 1 time(s). Last edit at 10/02/2016 09:07AM by MisterCrazyBoy21.

i got it. it happened to me also. the line is this one:

#define MANUAL_Z_HOME_POS

i was messing a lot that time but i believe this is the one which solve that problem.

thank you for your response
what did you change to that line to fix it?

mine should be something around 275. try some lower and higher values. if it wont work, i might be remembering wrong. i can send my configuration settings tho, so you can compare with yours.

I tried different values but it didn't change anything.
if you could send your configurations, that would be great.
thanks a lot!

i attached it, but dont use it as it. i am not using it as 3d printer, heaters and extruders may cancelled or wrong configured.

Thank you very much, I don't have time to look at it the upcoming days.
But I ll let you know if I find anything.
Thank you very much

Greetings

I took a look in the file but didn't find anything strange.

The problem is fixed!!
What happend was that I forgot to set the jumpers underneath the motor drivers.
Because of this the motor steps where way to big.
In the homing sequence the motor move up until they hit the end switch.
When they hit the end switch they stop moving and move down a bit.
Because my steps where way to big, the first axis to move down, moved down way to much.
When the axis moved down that much I had to push the emergency stop.

In short,
I forgot the jumper underneath the motor driver and because of that my steps where way to big.

Thank you for your help!

Good you made a FIX...
Could I please have a copy of your configuration.h ?

I am working on my own 3D-printer: [www.planker.dk]
Thanks...

Sure you can, but i haven't finetuned my printer yet.
I used this instructable to make my printer: [www.instructables.com]
so all credits to him, i only adjusted his configuration file a bit.