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

You are a genious, man!!

afogassa <afogassa@...> escribió: YOU can seeit here http://www.youtube.com/watch?v=ApVmWkH2tuw

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Maxi Bertotto
<tiwanacote@...> wrote:

>
> Wouuu!!!! Do you have any kind of video of your machine working???
> Tiwanacote
>
> afogassa <afogassa@...> escribió:

This is what I came up with, maltodextrin 25% and 75% regular

> plaster. It holds the plaster particles realy well, I've got the
> first part out of the machine with that mix printing on high

setting

> (1200 dpi) and a 0.1mm slice.
> It looks very nice.
> Just don't add too much dextrin, or the parts starts to curl

while

> printing.
> Dextrin works like glue when it gets wet, I do print and then

put

> the part on the owen (60 degrees centigrade) for about 30 min

then

> seal it with cianoacrylate(super bond).
> If you don't seal it , it keeps absorving humidity and never

gets

> hard enough to handle it, it's rainning a lot down here.
> The plaster powder sample I've got from zcorp had some kind of
> glue mixed with it, probably PVA, so I tough about adding the
> dextrin to the plaster and guess what.., it work.
> I've to do a little work on the sliding shafts before atempting

to

> get another part printed out.
> Don't know if the parts will come up dimension stable but it

was

> nice to see it printing ( about 233 layers).
> The finish line is not there anymore!!
>
> Fogassa.
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, H & J Johnson
> <hjjohnson@> wrote:
> >
> > 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/
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to

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> > >
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this

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