[Miron.Costin]

Dear Madam/Sir

My name is Miron Costin from Romania , the reason I post this threat is maybe you can give me an advice in my problem .

I will try to describe you my problem :

I build a 3 axis CNC ( 2700 x 1700 x 200 mm working size ) Mach3 control
1 servo motor on Z axis
1 servo motor on y axis
2 servo motors on X axis


When functioning one motor from the 2 of the X axis loses steps and remain behind
From all my research I think the only problem is that the electric signal from the encoder
interfere with voltage of the motor , I use shielded cable but do not know how to link it to the ground of the machine , I heard once upon I time that I need transistor but I don ;t know the values .

Please corect me if I mistake and maybe give me some advice in solving my problem .

Here is the some info about the components used :

drivers : Gecko Drive 320 X
G320X Digital Servo Drive


Encoder : E5-500-250-I-S-D-G-B

US Digital | Products » E5 Optical Kit Encoder

Motor : Servomotors

http://www.motiontek.ca/pdf/SM341100.pdf


P.S. The reason for why I think is the signal is that when I put a direct cable from the driver to the motor it is not noisy , but when I put it back through the portcable with all the wires it becomes noisy again and start trambaling .

Best regards ,

Miron Costin

[Al_The_Man]

I could be wrong, but the only method I have heard of so far using Mach with two motors on one axis is using steppers, Usually to use servo's, you would require a system that is capable of electronic gearing, A Slave axis encoder geared from a master encoder.
Systems such as Galil Motion cards will do this.
With Mach, each axis loop is closed separately and independently?
Al.

[danyyell]

hi
i am Daniel also from Romania
An axis with 2 motors on a single axis and 2 encoder is called GANTRY nut i think that your is not because this option is very expensive.
There are 2 possibilities:
1. Noise and you can resolve using an outside shield from an electric cable connected just to one end to the groung.
2. your cable are to long and you need a amplifier.

If you need more help contact me on email

[awerby]

I think it's possible to use Mach3 to control two "slaved" servo drives. Each one would need its own drive, but they can share a signal. Since Mach3 doesn't really close the loop (the loop is closed at each individual drive) it works the same way with servos as with steppers - the program sends out step/direction signals; what the drives do with the signals is up to them.

But it does sound like Miron's problem has to do with RF noise from the router interfering with the low-voltage signals from the encoders, and that shielding and grounding could help.

Andrew Werby
www.computersculpture.com