How to connect a two driver on same axis

Hello.

First of all, I want to thank you in advance for your collaboration and for everything that I have learned here.

I'm currently building a portico type milling machine with X-Y-Z axes, and plans to expand it in the future. I'm using a mesa 5i25 + 7i76 combination with HBS86h closed loop drivers.

For the Y axis I've installed two spindles with one motor and one driver each, so two of each device in total. What would be the best way to connect them?

At first I thought that the same 'step' and 'dir' signals of the Y axis would be enough for two drivers connected in parallel, since I've read that the the inputs of the drivers only consume 25mA and the 7i76 is capable of outputting 350 mA. I suppose this spec also refers to the current it supplies in the 'step' and 'dir' outputs. Will I encounter any problems, or is this configuration correct?

Mods feel free to reassign my post to a different category. And excuse me if my English is not correct.

I look forward to hearing from you, cheers!

Hello ......

I think the keyword for your question is "gantry".
one stepper at X
two steppers at YY
one stepper at Z

Maybe this article will help
forum.linuxcnc.org/49-basic-configuratio...ry-with-linuxcnc-2-9

Thank you mgm.
"I think the keyword for your question is "gantry"." 
sorry, my english is not good ...

one stepper at X
two steppers at YY
one stepper at Z
that's what I want to do

I read that : The easy way is to output same signals on two pins on parallel port for both drives, the harder but much more useful way is to configure it as a gantry with two Y axis.

But I wonder if instead of changing things in settings, what if I connect two controllers in parallel?
The step and dir signals would go to the inputs of the two controllers.

Thanks

Ok. I'll do it then, so I'll have two free channels to "play around a bit" (after it works fine with 3 axes) ...

Thank you