Re: 3D printing, powder spreading

Ted,

Wow! It just keeps getting better and better...

Thank you for this AND your previous posts!

Boy, in one day; a way to 3d model ANd a way to print pcbs with
soldermask and component ID...

Life is good. What a GREAT time to be alive!

B

P.S. Do you think the plastic sides of the tank will create problems
with the build "block" of powder NOT moving downwards? Due to
friction, static, etc.?

I could fab the tanks in stainless mirror plate if that's the
case... But plexiglas/perspex will be MUCH easier for most hobbyists
(With Graham's "pumps" version easier still.)



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "laserted007" <thyde@...>
wrote:

>
> Ballendo -
> The commercial unit has the single pillar screws; they are bulky
> enough and quite solid; almost a 1" screw, IIRC. I would have
> simulated that design, as it was quite compact, but a 1/2" all-

thread

> (that which I had on hand) wouldn't have been stable enough, at

least

> without additional support, plus, I just wanted something quick,

hence

> my 4 springs. I left a LOT of border space around it (about 2mm

OVL)

> but that means the powder drops through and makes it messy....I do

get

> that on the commercial unit too, so maybe it isn't all that bad!
>
> Personally, I lean towards anything that isn't a single point of
> contact - tri or box structures have always performed well in the
> past, however synchronizing them could be a challenge. 4 solid

guide

> rods perma-mounted to the bottom of the build plate, that slide
> through bushings in a reference plate at the bottom of the bin,

then a

> single or double screw in the middle may work. The thicker the
> reference plate, or more accurately, the longer the distance

between

> eh entry and exit points (so it could be two separate reference
> plates, separated by, say, 2") would ensure very little

slop....hmmm..

>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@>

wrote:

> >
> > Ted,
> >
> > Thank you for sharing this. Helps immensely.
> >
> > Ballendo
> >
> > P.S. You mention having single raising/lowering screws. And than
> > follow that up with a comment about them being problematic.

Would my

> > idea (tubed double screws) help in this area, based on your
> > experience?
> >
> >
>