Re: [CAD_CAM_EDM_DRO] Re: replacing feed screw with a hydraulic cylinder

Well, you could gear it way down with timing chains/cog wheels, put encoders on
the shafts, and use them to drive _hydraulic_motors_ with some solenoid valves
set up H-bridge style. There'd definitely be enough oomph to drive those ball
screws.....:-)

Bill

On Sun Dec 1 14:06:04 2002, blown_mgb_v8, <jblackwood5@...> wrote:

>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
>> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>> > Post Messages: CAD_CAM_EDM_DRO@y...
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>> >
>> > OFF Topic POSTS: General Machining
>> > If you wish to post on unlimited OT subjects goto:
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>> reach it if
>> > you have trouble.
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>> >
>> > http://groups.yahoo.com/group/jobshophomeshop I consider this
>to
>> be a
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>> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
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>> THEM.
>> > DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>> > bill
>> > List Mom
>> > List Owner
>> >
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>
>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
>Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
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>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
>Moderator: jmelson@... timg@... [Moderator]
>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>bill
>List Mom
>List Owner
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

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