I have a dual y axis drive both motors are running at 3A so I can't parallel the motors. My gantry is heavy maybe 80 kg.
I want to add a rotational axis.
The way I see it is I can add 2 external drivers(sharing the step and direction outputs from tinyg) which allows me more current and voltage for my y drives and frees up one on board driver for the rotational axis. Hopefully
I won't need level shifting or buffers to drive the drives.
Only other way I can think of is to get a second tinyg and try to get them working in sync.
I have a v8 tiny g, How do you network 2 together?
The first way seams like a bit of a hack but I think it'll work best, more power for my y, less heat in tinyg.
For using tinyG, I would suggest your 2 external driver method. Not many folks have experimented with the networked tinyGs approach and there is not much development on that path.
TinyG outputs 3.3 volt logic, so the need to buffer the Step and Dir leads will depend on the input requirements of your chosen drivers.
Make sure you consider how to reverse the direction of one of the two Y motors, as the polarity setting in tinyG won't do it for you.
And, be sure to set the microsteps on the external drivers consistently with what tinyG is set for as well
If you want to pursue a more bleeding edge approach, you could try tinyG2, running on a DUE, with 5 external drivers. There is a lot of active development on that path. TinyG2 has the performance and connectivity for up to 6 motors.
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