Re: Re: Re: Re: Re: Electronic Lead Screw & Power Cross Feed | Poor Man''''s CNC ?

> >>Not necessarily true. We have a Bridgeport/Romi CNC lathe at work that
> >>can be used manually as if it only had a DRO. You might notice a slight
> >>drag on the handwheels, that is about the only sign. I don't see why a
> >>CNC setup that preserved the handwheels couldn't be used manually.
> >>It would need either low-cog stepper motors or servos. If the servos
> >>had feedback to the computer, then it could act as a DRO when not in
> >>CNC mode.
> >>
> >>Jon
> >>
> >>
> >
> >Mach3 does just this. A seamless swap over from manaul to CNC with the displays acting as DRO's
> >
> >
> With a number of limitations. For instance, the encoders can never
> exceed about
> 30,000 counts a second or there is the possibility of lost counts, since
> this is
> a software-only encoder counter. And, of course, you need to have encoders
> and servo motors to read the position at all.
>
> Jon

Jon,
As Mach3 uses a single pulse encoder the 30,000 counts a second don't apply.
True you need an encoder but so will a black box and that will also need the stepper or servo to drive the screw.
I know of one guy using mach3 commercially threading 1/8" BSP [ 28 tpi ] taper thread at 1,000 rpm to a shoulder.
same applies to 1/2" x 20 tpi UNF.

Surely that's proof ?

John S.




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