RE: [diy_3d_printing_and_fabrication] Re: ultrasound mixer
I will add that machines like traditional sla’s simply use the build plate to mix the material by lowering it and raising it in between builds.
Magnetic stirrer "fleas" might be a neat way to do it.
On Mon, Feb 18, 2013 at 2:59 PM, afogassa <afogassa@...> wrote:
maybe you are right, i´ve being thinking about and i think a vibration system might work better then pumps. i just need to shake things up.
A pump would still have the pigment setting down at corner of the vat unless i´ve a tube running along the vat´s edge with lots of holes on it but then i mould need a powerfull pump and need extra resin to fill it up.
i don´t want to remove the resin from vat when i´m not using it becouse i lose some resin everytime i clean the vat and it can damage the silicon on a short time.
So, I think of having four motors with impellers or a single motor with a mixing arm (rc servo motor) to keep things moving when i´m not using it.my vat has a air tight top lid on it adding motors with impellers on the lid to keep it moving when i´m not using looks like a better idea.It would turn on and of maybe every 15 min. in stand by.
if i increase the vat return speed when printing would also keep the resin moving around and keep it well mixed during the build process.
--- In firstname.lastname@example.org, Graham Stabler wrote:
> Or vibrate some paddles suspended in the resin. Or what about a frame
> (square with square cut out) sitting in the tank at the bottom around the
> build area, lifting this up and down would cause resin to be sucked under
> and then pushed out disturbing it?
> One general issue with using pumps to mix might be that you end up with
> areas with less flow and therefore a build up, like silt in a river. An
> ultrasonic mixer may be just the thing, no where for the resin to hide?
> On Mon, Feb 18, 2013 at 12:35 AM, afogassa wrote:
> > **
> > it would be off when projecting. don´t know how the resin would react to
> > it thou.
> > I´ve seeing some water oil blending being done with ultrasound maybe it
> > can keep the pigment well mixed in the resin.
> > there are some cheap facial cleaning ultrasound stuff on ebay.
> > another idea is to use a couple pager motors to vibrate the glass.
- --- In email@example.com, "afogassa" <afogassa@...> wrote:
>It's called a sonicator. Chemists that make inks, photopolymers, etc, etc, routinely use them to mix components.
> maybe you are right, i´ve being thinking about and i think a vibration system might work better then pumps. i just need to shake things up.
http://www.youtube.com/watch?v=ONFk6PZ2nNY is an example of dispersing carbon black in water with the aid of a sonicator. The carbon black won't be stable in the water (stay in suspension for several weeks/months) without additional processing steps.