Re: [CAD_CAM_EDM_DRO] Re: lexmark 3d printer is back (binder & build matl)

Have you guys tried looking through USG.com's site? They have several
high performance plasters. One in particular which might work for you
is called Rayite100. It has a flash time of 20-30 minutes and comes
out like plastic [it's a plasticized plaster.. if thats the proper term]
just add water. It's origin is as a castable and machinable plaster.
It is supposed to machine dust free [just soap like chips]. It's also
great for those who want to do test machined parts and patterns
as well. It's not terribly cheap however, a 22kg bag is ~$125usd..

If that doesn't fit the bill, there may be other types on there which
would... they have hundreds of different types of plaster for different
applications..

FWIW
Jarrett Johnson

> Guys - we were going to try dental alginate in our machine, but never
> got around to it - in "cup" tests, however, it seemed to perform just
> as well (time to solid, absorption, heat, etc) as our original
> high-performance build material. We also tried a bit of molder's
> plaster (it does feel finer than wall-patch) with equaled success, so
> spread-ability is the real determining factor here (stabilizers and
> de-cakers really don't apply to our typical storage times!)
>
> I don't know which post it was, but I think I recall one of you
> mentioning that perhaps "adding a glue to the build material"....ZC
> announced on their price list just recently a new premium performance
> build material with binder added for greater green
> strength...small world.
>
> Ted.
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "afogassa" <afogassa@...>
> wrote:>
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler"
> > <grezmos@> wrote:
> > >
> > >
> > > > Santa stop by to help me out :)
> > > > The roler came from a old lexmark laser printer toner
> cartridge.> > > it's aluminum an about 30mm diameter.
> > > >
> > >
> > > I used to have a nice roller like that but thought I would
> never
> > need
> > > it, should be easy to find one though.
> > >
> > > What about the rotation speed, have you synced it to the
> movement
> > of
> > > the gantry or did you just experiment? How well does it work
> and
> > do
> > > you think the plaster used is of great importance, you used zcorp
> > > stuff right?
> > >
> > > Cheers,
> > >
> > > Graham
> > >
> >
> > I'm using just plain plaster, it does not spreads nice.
> > Zcorp plaster is granulated, almost like refined sugar, it
> should
> > spread very nice, I don't have enough zcorp powder to fill the
> > feeding bin with it, so can't tell for shure.
> > i've tried refined sugar and it spreads very nice.
> > The rotation speed was just to get the powder spread,not shure
> at
> > what speed it's rotating, I guess it's about 200rpm.
> > The type of plaster is very important, as it should spread
> without
> > lumps.
> > There is a granulated dental plaster that I've to check it out.
> > I think that the main thing is to get the right binder or glue
> to
> > hold the plaster particles togheter and does not clog the
> printer
> > head, that's a tough one.
> >
>
>
>
>
> 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
>
>
>
>