Re: [CAD_CAM_EDM_DRO] Re: tach output

jakefife wrote:

> --- In CAD_CAM_EDM_DRO@y..., "jakefife" <jakefife@h...> wrote:
> > Hi all,
> > Can you use servo motors without the tach drive hooked up.
>
> Thanks for answering one question, but have another
>
> The reason i ask about the tach drive is that i have a tree mill
> 2 axis. I have the power supples ,servo motors and encoders and only
> on of the axis drivers. I'm looking at emc with gecko drives , but
> really not sure what direction I should take. any ideas? thanks Jake

Well, I have a strong preference for real servos. The difference with the
Gecko drives is that the CPU has no position feedback. It sends step
pulses to the Gecko, and hopes it got there. If you have a crash,
axis fault, emergency stop or whatever, you have to re-home the system
so the CPU knows where the machine is. You can't use the CNC program
as a DRO and move the machine manually. Also, at extremely slow speeds,
the gecko drives move in a step-step fashion. I can get smooth motion
down to about .01 IPM with my tach-servo system.

Servo amps are available on eBay, sometimes for quite reasonable prices.
In this case, it sounds like you only need one.

Jon