Re: Electronic Lead Screw Drive Article ?

>
> turbulatordude wrote:
>
> >--- In CAD_CAM_EDM_DRO@yahoogroups.com, juan gelt <juangelt@y...>

> >
> >
> >>i believe the system will work with some limits of
> >>accuracy. however, i also have a question on the
> >>actual utility of it. if you are already CNC and have
> >>a spindle encoder, you have a much more elegant route
> >>to all the control, no?
> >>
> >>
> >>
> >>
> >
> >Congratulations on being the first to accress this for it's technical
> >merits ! (I was geting to cut this thread.)
> >
> >
> >I have an old SB lathe with manual change gears.
> >
> >I was thinking something like this would be a way to just add variable
> >speed to the spindle and also add electronic thread cutting.
> >
> >
> I don;t think this device, as it stands, would be useful for Imperial
> threading.
> It was aimed at standard metric threads, where a very limited number
> of ratios will suffice. It could probably be expanded on to give most
> of the standard
> imperial threads. But, 11, 13 and 27 would be a problem, for sure. I'm
> not sure it actually has a limitation to even ratios, but I thought it
> might.
>
> Also, I'm not sure what happens if you stop the spindle, or open the
> halfnuts and have to move the carriage. I guess that would be the same
> problem as with standard threading gear systems, you have to sync the
> carriage to the leadscrew with the threading dial, and the thread pitch
> determines which marks you can use.
>
> Jon