Re: [CAD_CAM_EDM_DRO] EPCOT CNC

That's a good reason to have a forth (rotary) axis CNC machine. Out here
they get mugs laser etched for bowling trophies. Anyone with a GOOD 4 axis
CNC machine could get into that business without have to buy an extra
(probably very expensive) laser etching machine!

By the way...I use a small air powered rotary grinder for hand carving glass
with carbide cutters. If you get into this, just remember, those minute
glass particles CANNOT be removed if they get in your lungs. Ingesting
those particles can cause silicosis of the lungs. Be sure to always wear a
mask when operating near that equipment and don't rely on the vacumn pickup
(or Murphy's Law will get you) and DON'T allow your customers to stand near
the machine while it's operating (unless you LIKE lawyers?).

Smoke

-----Original Message-----
From: daveland@... <daveland@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Tuesday, November 07, 2000 11:44 AM
Subject: [CAD_CAM_EDM_DRO] EPCOT CNC

>Well I went on vacation at disney world in Florida for 10 days
>and I just couldn't escape CNC. I found a jewelry booth in EPCOT
>with a neat cnc engraving machine made by a jewelry company in
>Orlando.
>
>I posted pics in the files area of egroups. look under the
>EPCOTCNC folder. read the readme.txt file for more info.
>
>interesting features: ( can be seen in the pics)
>
>Acrylic plaques are made 12" square 1/2" thick . engraved from the
>back with high speed
>carbide cutter surrounded by a circular brush. The brush does not
>rotate. It just scrubs the chips as X and y motions occur. A vacume
>cleaner sucks up the swarf into the center of the brush.
>
>Workpiece is held upright in a "window frame" that can translate
>left/right, up /down. Milling head plunges (Z) from the rear of
>the work to engrave it.
>
>Stock linear V ways are used with some SKF # on the guides. The
>X way has 2 ways, one in front (say 2ft long) and a split rear
>way that is 6-8" long. This limits X trave to 6" or so. The ways
>are bolted to the 1-1/2 thick aluminum base via stand offs. It looks
>a bit precarious, but it seems to work. The y axis uses a similar
>set of ways to translate the "frame" up and down.
>
>
>Ball screw on X and Y (1/2" diameter??) . Z is hidden. Probably
> servo driven since
>I see and encoder on the motor which has fins like some servos I
>have seen in books. They use the bearings in the servo to support
>one end of the lead screw. The other is running in a bronze bushing
>pressed into the machine frame. A flex coupler is used as well. very
>simple!!!
>
>A tool changer is mounted on the window frame. It holds 6 or eight
>carbide cutters. .125" shaft on the cutters I think. The mill head
>must have a collet release mechanism.
>
>It takes 11 hours to finish one plaque. feed rate apears to be 1-2
>inches per second. Fast feed might be 3 or 4 times faster. Lots
>of detail in the workipiece.
>
>The machine is very "pretty" having a high tech brushed finish look
>and lots of rounded corners. All wiring is hidden. This is a
>machine designed for public viewing. It was behind a plexiglas
>kiosk so some photos have reflections etc. The whole machine base
>rotates 180 deg slowly while milling so the "audience" can all get a
>good look!!!
>
>
>The pics might inspire someone to design something like it.
>
>have fun
>dave
>
>
>
>
>
>
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