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]