Re: [CAD_CAM_EDM_DRO] Re: Z axis conversion

Hi list
my bridgeport z axis as I said earlier is almost a copy of Jon's but with the difference
that it uses a triangular plate and is bolted to the quill by the 10 mm screw that
is used on the machine stop and also another 1/4 screw on the bottom of the triangle
the triangle base sits against the quill an is 2" long the total travel of the quill from
home position to the bottom limit switch is 92 mm
regards
mariano


Wally K wrote:

> Hugh, I have had the same idea about the clamp on the quill. I
> finaly decided it would have problems because of the clearance you
> would loose. The clamp would be on the bottom of the quill and go
> down with the quill. So if you are machining something that has to
> get close to the quill there would be an interference problem. I do
> think it would work most of the time though.
>
> On the other methode of using a bolt in the front of the quill to
> move the quill up and down. The bolt loosens up because it was never
> designed to transfer power to the quill. I think the loosening is
> because of the rocking motion on 1 little bolt causing it to stretch.
>
> Wally K.
>
> Hugh Currin wrote:
> >
> > I don't see how the screw could come loose from the quill? Any
> scheme
> > I think of restricts it from rotating, thus unscrewing.
> >
> > I've alternately thought of putting a split collar clamp around the
> bottom of
> > the quill. A ballscrew mechanism can then be attached to this
> collar/plate.
> >
> > The ball screw itself could be attached to this collar/plate. It
> couldn't
> > extend below the quill though, so the ballscrew must move up and
> down with
> > the quill. If the motor is also mounted on this collar/plate (i.e.
> > moves with the quill) a timing belt could drive the ballscrew. But
> if
> > the motor is mounted on the head, driving the ballscrew gets more
> complex
> > as the screw moves axially relative to the motor. One could drive
> > the ballnut, but the bearings to mount the ballnut would get big.
> >
> > Alternately, a tube could be mounted to the split collar clamp/plate
> > extending up alongside the head. The ballnut would be at the top
> of this
> > tube and the ballscrew extends down inside it. This moves the
> ballscrew
> > mechanism up so it doesn't extend below the quill. The ballscrew
> is then
> > mounted with bearings at its top to the head. It would be fixed on
> only
> > one end, similar to a bridgeport Y axis. Rotating the screw would
> drive
> > the quill up and down. The motor is fixed to the head. However,
> it may
> > be difficult to align and maintain alignment of the tube and
> ballscrew.
> >
> > You'd only loose half to 3/4 of an inch in quill travel, the
> thickness of
> > the collar/plate.
> >
> > I hope this makes a little sense, I have trouble describing things
> without
> > sketches. You can see I also do not have a good solution for
> this. :-(
> > Be sure to let me know what you come up with. Thanks.
> >
> > Hugh Currin
> > Klamath Falls, OR
>
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