Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's, 3D surface modeling for EGG-BOT

----- Original Message -----
From: "Alan Marconett" <KM6VV@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, October 20, 2005 12:33 PM
Subject: RE: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's, 3D surface modeling
for EGG-BOT


> Hi Victor,
>
> To bad you're not in the area, I'd love to take a look. I never did find
> my
> plotter manual, so it's in one of the 12 or so shipping boxes in the
> garage.
> ;>)
>
> If the blinking error light never goes off, even with power down/up, then
> it's an internal problem. The baud rate switches could be dirty, and not
> reading correct? Maybe exercise them, or try 1200 baud vs. the 9600 you
> are
> using?
>
> I was hot to build an egg-bot a few years ago, almost made it, but I
> started
> to over-engineer it, and got side tracked after that. It's pretty easy to
> drive small steppers (NEMA #17) with nothing more then a ULN2003 for the
> unipolar motors, and an H-bridge package (forgot #) for the bipolar ones.
> Easy to steal stepper motors and driver parts off old 5" floppy disk
> drives.
>
> I believe TurboCNC can run 4-phase (unipolar) stepper drivers. I've seen
> some little boards with similar drivers to the ones mentioned above for
> about $20.
>
> It would be interesting to "project" an image onto the eggs surface. I
> think one would have to do a NURBS surface (egg might be a little
> tougher),
> and then project the drawing on it. I know, overkill for an egg-bot! ;>)
>
> Vector CAD/CAM with the 3D surface modeling addition can no doubt do an
> egg,
> although I'm not there yet in my continuing education! Then the drawing
> would have to be translated to an 'A' (rotary) axis, I think. The egg-bot
> would have an A, X, and either Y or Z axis. I'm guessing that the Z (or
> Y?)
> could be reduced to a pen up/down solenoid. Interesting CAD/CAM/HARDWARE
> project!
>
> I'm interested in trying some "organic" shapes; I guess an egg would fit
> that! So far, I only machine "regular" shapes (?), like flywheels and
> steam
> engine cylinder blocks. My next goal: buy the "3D surfaces" upgrade, and
> learn the surface modeling!
>
> I do need a way to "clamp" the egg. I know they showed some real simple
> holding devices on the website, but I found it a little tricky! Their pix
> shows an 'A' axis and a 'B' axis (?) that acts like an X axis and
> transverses top to bottom of the egg. (MILL axis convention) The pen is
> loosely held, manual pen up/down here!
>
> http://www.taomc.com/bits2bots/
>
> And you've probably seen them, but there are some references here:
>
> http://www.taomc.com/bits2bots/reference1.htm
>
> Cheers!
>
> Alan KM6VV
>
>
>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
> timg@...
> Moderator: pentam@... indigo_red@... davemucha@...
> [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> 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 to be 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.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>