Re: Moog: update

It's been awhile... But now the mill is mostly back together and with
a fresh coat of paint as well. Photos are at:
http://photos.groups.yahoo.com/group/diy-cnc/lst?.dir=/Moog&.view=t

All the hydraulics except the power unit and a few other components
such as cylinders have found their way to the dump, making plenty of
space for ballscrews and servo drives. I have a pair of servos but
need to buy the screws and all the rest so it'll not be done right
away, and I'll be asking for advice as to what to use. My current
thinking is perhaps something in the range of a 1-1/2" 5 pitch
ballscrew for x and y, and maybe about a 5/8 or 3/4" screw for z but
I've forgotten the discussions that went before and will have to
search back and review. I'd also like to put a drive on the knee at
least for rapid traverse but keep the original screw. I think the two
servos I already have should be usable but I'll also need another one
for the quill and perhaps for the knee as well. Or, I suppose I could
just put one of those add-on power feeds on it, though it'd be good to
interface with the controller for position information.

Anyway, any and all help would be greatly appreciated.

Jim


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Andrew Mawson" <andrew@m...>
wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "blown_mgb_v8"
> <jblackwood5@i...> wrote:
> > I was nosing around in the control cabinet today and after seeing
> > the bank of relays this thing used I expected to see just about as
> > many air logic devices and interfaces between air and electric.
> > Imagine my surprise to find only a few air solenoids in there!
> > That's weird.
> > On another note, the head didn't come equipped with a worm and
> > pinion for sideways tilt, just a eccentric pin for centering and
> not
> > a very good mechanism at that. I've been cheerfully cutting down a
> > worm and pinion out of one of the gear reducers that came on my
> > servos to see if I can fit that to the head and I believe I can
> make
> > it work even though it's a bit big.
> > Other good news, we sold the old house so now I have funding to
> > build my workshop. It'll be a 40'x 60' metal building with 14'
> > rafters. I hope to have it done by fall and have the Moog inside.
> >
> > Jim
>
> Jim,
>
> THe air valve are mainly in the pneumatic / hydraulic servo
> mechanisms for X, Y, & Z. Air passes through holes in the paper tape
> and is lead by thin pipes directly to the actuators. A small air
> cylinder pushes out an 'interposing' pin and thus a binary word
> representing the desired target location is set up on these pins. A
> series of stacked plates engage with these pins. There is a 'set up
> cycle' whereby all the plates withdraw, then try to go forwards -
> some will not due to the pins. The final result is an oil passage way
> through all the plates at a linear position of the target
> destination. The hydraulic servo then homes on this position.
>
> Complicated, but it worked !
>
> Andrew Mawson
> Bromley,
> Kent,
> UK