Re: [CAD_CAM_EDM_DRO] steppers or servo?

Hi Terry and List.

I'm not sure that I haven't missed something here, but what I consider as
a servo may not achieve a move for various fault reasons elsewhere in the
system, but surely it will still "know" where it is, and hence not "miss
steps". Iagree with the comment re steppers, but a feedback machine (servo
system) should surely hold the programme until it achieves the requisite
end position for any move sequence, hence if it cannot complete the move
the system will surely throw an alarm and stop?

Jim Gregg

At 01:14 PM 7/8/00 +0000, you wrote:

>Hi,
>Computer printers use stepper motors and they run forever with
>incredible accuracy. A hobby nc machine will also have the same
>repeatability as long the motors are not forced into missed steps,
>right?
>Servos can also be forced into missed steps so the advantage over
>steppers must just be the extra speed to return to the home
>position?
>Terry
>
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