Connecting RAMPS to big CNCrouter LPT controller ??

I need fast convertion large CNC router to 3d printer.
CNC is controlled by LPT controller and EMC2 software.
I have an Arduino + ramps1.4 with Marlin and think about to replace 3 stepsticks(x/y/z) with diy adapters wired to LPT to control big drivers.
Also I want to get endstop signals from LPT and connect them to RAMPS.

Will this work?

Extruder driver remains on RAMPS. Wires to head will be long enough - 3-5 meters
Will extruder stepper work?
I expect no problems with termistor and heater wireing.

Edited 2 time(s). Last edit at 07/13/2014 02:59PM by karabas.

Should work. My local hackerspace did the same with a laser cutter after the default hardware bricked itself. It's now running a custom board but it was running RAMPS for a while.

Biggest issues driving external stepper drivers is:
1. Logic level.
2. Signal pulse length out of Marlin (I think it's adjustable - external drivers tend to have optos in them, so you want to have longer pulses to accurately drive them).

Quote
Cefiar
Should work. My local hackerspace did the same with a laser cutter after the default hardware bricked itself. It's now running a custom board but it was running RAMPS for a while.

Biggest issues driving external stepper drivers is:
1. Logic level.

that is why I want to feed DIR ans STEP from RAMPS not direct to drivers but to stock LPT controller. I think logic levels LPT and RAMPS are the same

Quote
Cefiar
2. Signal pulse length out of Marlin (I think it's adjustable - external drivers tend to have optos in them, so you want to have longer pulses to accurately drive them).

That's the question.

you can feed the driver directly
it works

i use ramps with m542