Re: [CAD_CAM_EDM_DRO] stepper vs servo

> In a message dated 07-Aug-01 19:17:45 Central Daylight Time,
> cadcamcenter@... writes:
>
> > Hope this is incorrect, otherwise the servo may be not that much more
> > better at avoiding spoilt parts than steppers.
> >
> >
>
> The X- and Y- steppers are independent, so, if the controller sends
> move-commands (some number of steps) to both nearly-simultaneously, and one
> stalls against some mechanical obstacle, the other "never knows this
> happened", so, you have a serious snafu! In the servo system, the "computer"
> knows what BOTH are doing (assuming you have shaft-encoders on both X- and Y-
> servos), so, if one gets hung-up, the computer just waits, and/or shuts-down.
> If you are modifying an extant lathe to attach lead-screw drives yourself,
> you will have vastly less grief and expense if you "start out" with steppers,
> at least until you teach yourself what it's all about!
>
> I do not use nor "read" G-code. I only know kinda what it is, and what a
> "block number" is, and that a "G number" tells the machine something like,
> "Hey, this will be a linear move to X and Y..." or whatever. X,Y, and
> Feedrate. I do all MY programming in GWBASIC, using a self-written ASM-86
> patch to "step" the two motors and turn the spindle-motor on/off via the
> printer-port. Simple stuff. FOR-NEXT loops.
>
> [Non-text portions of this message have been removed]
>
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