Taupe <
jona...@yopmail.com> wrote:
> I have a auto. coffee machine with a busted Gear & was wondering if it was
> possible to replace the gear by 3D printing it.
>
> It is a significant piece as it compresses the ground coffee with plunger
> before hot water forced through.
>
> with age/ over-use/misalignment? the teeth on the gears have broken off (as
> it
> is made of plastic )
>
> Is it possible to make a solid gear able to withstand the above forces or is
> the method of 3D printing (i.e built up droplets at a time) make it
> structurally week, not as strong as "injection moulding"?
Hmm, lots of answers here from people who have obviously never had
anything to do with a 3D printer.
Keeping it short:
3D printers can print gears well. There are two key types for home
use. One sucks up plastic "filament", melts it, then squirts it onto
a build platform in a pattern that, layer-by-layer, builds up a 3D
shape. Another shines light onto a vat of light-curable resin (the
light can be from a laser beam directed by a mirror, a projector, or
most recently an LED display panel (possibly still attached to a
smart phone)). The former is what ALDI are selling, and is also
better suited to printing gears and other strong objects than the
latter. I think OfficeWorks have Makerbot ones, which are also of
that type, but I haven't actually seen them in the branch that I
go to.
Ideally use ABS instead of PLA because it is less brittle. ABS is
slightly more difficult to print with and requires a slightly higher
temperature to print with, so some models, I think including the ALDI
ones, don't support its use.
The issue of layer separation, which I think you're getting at, is
only significant where force is in the opposite plane to that where
the layers were built up. That is to say horizontal with the object
in the same orientation that it was in when it was printed on the
3D printer's build platform. For a gear, this would be as you would
normally print such an object. So it will be as strong as a solid
object, as long as the infill setting is set to "solid" or "100%",
otherwise gaps are left inside the object to save time and plastic.
There are countless examples of gears on
thingiverse.com, including
software to automatically generate gears to particular
specifications. Sorry, I don't have time to find links. I don't
actually remember printing gears with mine, I have a whole bunch
from old printers and toner cartridges used for DIY projects. I have
printed pulleys, which worked well. Though last time I decided it was
quicker to just make some small ones out of wood with a round file
and hole saw.
--
__ __
#_ < |\| |< _#