Re: Moog: Servo for Z?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:

>
>
> blown_mgb_v8 wrote:
>
> >I've torn down the head and have the lower casting in the truck

for

> >clean up and trimming. Anyone have a suggestion as to a good

servo

> >to use here or how to best set it up? My thoughts are to cut away
> >the side housings which contained the hydraulic actuators,

eliminate

> >the manual feed handle and shaft altogether, cut the heavy side

off

> >the quill coupling yoke and mount a ballscrew and servo on the

left

> >side.
> >
> Well, I'm not familiar with the Moog head, but that generally

sounds OK.

> You want to
> keep the ballscrew as close to the center of mass of the head, and

as

> close a possible
> to between the dovetail (or other) ways, to prevent a rocking

force on

> the head.
>
> > Anyone think this is good/bad? I haven't got the ballscrew for
> >it yet. This machine has a 2 hp head and will occasionally be

used

> >for drilling large holes so the servo package will need to be

able

> >to generate quite a bit of downforce.
> >
> >
> The Bridgeport power quill feed has an overload clutch set for 200

Lbs

> of linear
> force. You may want to set it up for a bit more than that,

depending on

> the size
> tooling you plan to use. You may need a quite massive ballscrew

for this.

>
> Jon

Wasn't there a setup where the ballscrew was attached in place of
the stop nut? Seems like I've seen that. My quill coupling yoke has
a good sized lug on the front of it so that might be worth looking
at too, although I don't know how it would be possible to get the
parts in there close. The other thing is, although I don't really
think it would take that large of a ballscrew to generate a 200 lb
load, especially since it only has to travel about 5 inches, still
there have been plenty of times when I've used the manual lever on a
mill just because the feed clutch would kick out, so it might take
as much as 500 lbs to give a good safety margin. But with that sort
of a loading requirement, what sort of a servo would be needed?

Jim