Re: Z axis on the knee, how practical????

Not Tim, but on series II BP's the knee screw is also an air cylinder
to counterbalance and assist moving the knee.

--- In CAD_CAM_EDM_DRO@y..., aaalfano <aaalfano@o...> wrote:
> Tim,
> Ok I give up. What the heck is "AIR ASSIST" on the knee?
> I'm still testing Z-AXIS on the knee on my bridgeport.
> I'm using 600 oz. in. servo & G340 drivers with Master5.
> With stepper motors on my Jet Mill/Drill, I can go to one location
& go back
> to X0.00.
> I can not get this to work with Servo motors. Also I hooked up a
Shooting
> Star scale on the
> knee & (I remove the wires from the encoder on the Servo) & when
it stops
> moves
> at a test setting, the Servo motors are hunting.
> Thank you,
> Al Alfano
> ----- Original Message -----
> From: "Tim Goldstein" <timg@k...>
> To: <CAD_CAM_EDM_DRO@y...>
> Sent: Tuesday, May 14, 2002 9:39 PM
> Subject: RE: [CAD_CAM_EDM_DRO] Z axis on the knee, how
practical????
>
>
> > Bridgett does not care if I lean on the table while she works.
For that
> > matter she doesn't care if I jump up and dance on the table as
long as I
> > have the air assist on. Just moves to where she is suppose to
go. My
> > Shoptask is a driven quill so I have experience with both. The
knee
> > moves plenty fast, but it is not a problem, but something
different to
> > get used to.
> >
> > Tim
> > [Denver, CO]
> > Close out stepper drives, encoder, stepper motors
> > http://www.KTMarkting.com/CNC.html
> >
> > > -----Original Message-----
> > >
> > >
> > > Group,
> > >
> > > I've been following the discussion of Z-knee conversions. I
> > > understand why this is done...because it's easier than fitting
a ball
> > > screw to the quill.
> > >
> > > My question involves what it's like to machine parts on a
B'port or
> > > larger machine with the Z on the knee. Personally, I can't
imagine
> > > it would be a desirable situation. First off, sometimes I
lean on
> > > the table as a part is being cut, that wouldn't be possible
with the
> > > table moving up and down. How about part visibility, isn't it
hard
> > > to closely watch the cutting action if the part is moving up
and down?
> > >
> > > So, tell me what it's like. Are you guys who are doing this
type of
> > > conversion experienced with more conventional Z axis (quill)
machines
> > > or don't you have any basis for comparison? Maybe the Z-knees
move
> > > so slowly there isn't a problem?
> > >
> > > just curious,
> > >
> > > Doug
> > >
> > >
> > > Addresses:
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> > >
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> > >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this
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> > 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
as 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.
> >
> >
> >
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