so hereś an odd one

switched over my ramp board as i blew a mosfet and melted the connection beyond repair, once i got everything hooked up my y-axis and z-axis steppers were running backwards. Fixed that by switching leads on the motors and everything seems fine except the y-axis will not complete its move.

I have a 200 by 200mm build area and here is my issue:

i home y-axis and it does what its supposed to

I move the bed forward by 50 mm no problem

the bed will move up to 150mm then stop

the computer will register that it has moved the complete 200mm when in actual fact the bed has only advanced 150mm

I have tried changing the steps per mm as well as my acceleration limit but the bed will not advance the last 50mm, there is no skipping or binding, the motor just doesn register the last quarter move

any ideas?

Sounds like you havent defined the print bed size in the firmware perhaps? Or in the host software (Pronterface?)

Look for the following line in marlins configuration.h file (assuming use of marlin)

#define Y_MAX_POS 150

that might be it, ill have to check at lunch, i defined it in my host (repetier) but have not gone through my firmware (marlin) thanks for the quick reply

also just realised its just repetier, so i can not in fact edit my firmware

Just download the latest Marlin firmware and start fresh!

update
just uninstalled repetier and downloaded the latest version, also downloaded the latest v of marlin, got both up and running, designated y-axis as 200mm in both, and still having the same issue.

I am at a loss as to why this problem persists and for now have resigned to deal with a 150mm build area

What happen when you rerun the Y axis to zero?

the bed returns to zero as it should, it doesnt over shoot, I even manually brought the bed to the 200mm mark and it does the full return, it just wont come forward past the 150 mark

It's not a EEPROM setting that you have forgotten...?

I had the same issue with my printer using Repetier. I had to manually figure out how much my movement was coming up short and add the additional to the printer's config for bed size. Once I added the appropriate amount of distance, the software would allow me to go past it's theoretical limit and use the full amount. When I send G-code to the printer for printing, it recognizes where it's supposed to go, but the manual controls are still off. Hope this helps at all if you haven't figured it out yet.

Marlin
define Y_MAX_POS 200
define Y_MIN_POS -50
I don't know about Repetier.