Re: replacing feed screw with a hydraulic cylinder

OOps, didn't mean to split the thread... Actually, I've been really
wondering if it would make sense to try to keep the hydraulic system
intact. I guess much depends on how well it works and what can be
done to interface a PC with the air logic system. From past
experience with air logic though I'm pretty doubtful.

Jim

--- In CAD_CAM_EDM_DRO@y..., "Sven Peter" <peteryco@r...> wrote:
> Hello Friends,
> I had in mind to change my hydraulic copy lathe to CNC. But
everybody
> I consulted said: Better not because its way it becomes more
expensive
> than servomotors and damn inacurate.
> I didn´t believe until I made a test with a clients proportional
servo
> valves.
> Now I second the warning:
> Too inacurate!
> Too Slow!
> Pretty expensive!
> Oscilation (0.02mm on radius!!!!)!
> Trouble with dirt!
>
> The day I may convert my lathe You can be sure I will kick out the
> pistons for ball screws and servos.
> Good luck
> Sven Peter
>
> --- In CAD_CAM_EDM_DRO@y..., Marv Frankel <dcdziner@p...> wrote:
> > Guys,
> > I've been following this thread, and although I've never
done
> it, I
> > wonder if the coefficient of expansion of the hydraulic fluid,
would
> cause
> > some accuracy problems? On a cold day, it would cut differently
than
> on a
> > warm day, and would you have to reset your Z axis every time the
> temperature
> > changed?
> >
> > Marv Frankel
> > Los Angeles
> >
> > ----- Original Message -----
> > From: "Ray Henry" <rehenry@u...>
> > To: <CAD_CAM_EDM_DRO@y...>
> > Sent: Saturday, November 30, 2002 6:28 AM
> > Subject: [CAD_CAM_EDM_DRO] Re: Re: replacing feed screw with a
> hydraulic
> > cylinder
> >
> >
> >
> > > From: "blown_mgb_v8" <jblackwood5@i...>
> > > Subject: Re: replacing feed screw with a hydraulic cylinder
> > <s>
> > > So here's the question(s), What would be suitable for
retrofitting
> > > the z axis (quill), what is needed to drive the steppers, can
an
> old
> > > P-90 IBM clone PC be used to run it, and what software is
> available?
> >
> > Hi Jim
> >
> > Yes the quill can easily be fitted with ball screws because
there is
> a
> > yolk that extends parallel to the x axis from each side of the
> quill.
> > That's where the air-over-hydraulic cylinder for z is attached.
> >
> > Ray
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
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