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Offline ben24  
#1 Posted : Monday, June 17, 2024 7:34:06 AM(UTC)

Rank: Newbie

Groups: Registered
Joined: 6/17/2024(UTC)
Posts: 1


I've been building a Shapeoko 2 CNC gantry milling machine since last week.

My control system runs with LinuxCNC on an old laptop with a proper parallel port and on the "milling side" a Chinese card with a parallel port interface and optocouplers is to be used.

My problem now is the wiring of the thing:
The travel paths of the milling machine are Y-axis 1000 mm, X-axis 800 mm and Z-axis 250 mm.

Nema 23 stepper motor with a phase current of 2 amps are installed to start with. Maybe even stronger ones will be added or I'll convert to a trapezoidal spindle drive. But first 2 steppers Y-axis and one for the X-axis.

The drivers for the stepper motors are equipped with TB6560.

The connection between the parallel port interface and the driver boards runs via 4-pin JST-XH jumpers.

After a long introduction, now to the topic:
In extreme cases, there is a cable length of around 2 meters between the driver board and the motor. (Z-axis motor).

Is it better to extend the 4 cables from the motor to the driver board and twist A and /A and B and /B together? (Of course with a cross-section of at least 1.5 mm² or better.)

Or does it make sense to only lay the supply cables to the driver modules that are installed near the motors and then extend the control cables accordingly?

In the second variation, of course with an additional 4700 µF / 35V electrolytic capacitor on the driver board to compensate for the losses in the cable length.
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