Re: [CAD_CAM_EDM_DRO] Re: 3D Printer

I was thinking of polyester resin, with is thixotropic. The hardener is hydrogen peroxide @ about 1%, this stuff is like water and should go through a print-head like ink. Provided the quantities were right you would get a gel and therefore a cure.

Regards

Terry

----- Original Message -----
From: hugo_cnc <Hwatering@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Tuesday, December 10, 2002 3:33 PM
Subject: [CAD_CAM_EDM_DRO] Re: 3D Printer


A 2 pack resin is that the same as 2-component glue? One of the first
idea was two use a two colour mode with two components, but you could
perhaps also mix one component with the powder and then "print" one
component (i.e. the harder).
The tricky part is that the curing time must be very quick, a couple
seconds max.

Hugo


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "James Owens"
<wotisname@l...> wrote:
> What if a 2 pack resin was used with the hardener sprayed on with a
print-head? The harder is usually hydrogen peroxide ( suspect
spelling). If the gel time was worked out and the resin was thick
there would be little bleed over.
>
> Regards,
>
> Terry
>
> This is a fascinating subject - especially as I'm just playing
around with
> the Gingery design for an injection moulding machine which is,
itself,
> basically a big glue gun for plastic! The biggest problem would
seem to be
> the regulation of droplet size but perhaps you could use a kind
of cylinder
> and plunger but with some form of solenoid to tap the top of the
plunger and
> make it squirt a 'standard sized' drop of wax out of the nozzle.
It may also
> need some kind of hot scraper bar to pass over the work as each
layer is
> built up so as to level it off to a known level.
>
> I was playing around with a couple of these rapid prototyping
machines a
> couple of months ago but never thought to really look closely at
the way the
> wax machine worked - I was far more interested in the one that
made an epoxy
> model at the time! Unfortunately, I gave up on the idea of making
such a
> machine when I found out the cost of raw material - over
10,000UKP for
> enough of the special epoxy resin to fill the bath of the machine
which was
> just over a foot cube!!! The principle of the machine was simple
enough -
> the model is built as layers and the top of the model is kept
just a
> hairsbreadth below the top of the liquid as a laser beam traces
out the
> design and hardens the epoxy it passes over. As each layer is
complete, the
> model lowers a fraction more to make a new wet layer (this is
scraped over
> by a bar before the laser is used so as to regulate the layer
thickness)
>
> As a matter of interest, when I was there, the wax machine was
making
> prototype cylinder heads for a high performance car engine. These
were in
> 2-cylinder units and had so many convoluted water ports that it
would be
> impossible to cast or machine them by any other means. The waxes
were
> costing around 1000UKP each to make and, as I followed the
process along to
> see one cast by a small company at the other side of town, the
caster
> dropped one and ruined it - I'm glad I wasn't close enough to get
the
> blame!!!
>
> Best wishes,
> Ian
> --
>
> Ian W. Wright
> Sheffield, UK
>
>
> [Non-text portions of this message have been removed]


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