Some pictures of some stuff that I have done that may be interesting
if you like machining.
A) Metal molds that run in single semi automatic cycles. The cycle
when activated will close the mold, inject the part, dwell for
cooling, open the mold and automatically eject the parts. This
particular mold has 14 ejection pins and one sprue puller which makes
sure that the sprue, the runners and the parts are captured in the B
mold ready for ejection. As the B mold (which is the bottom one and
static) moves up, it will capture the sliding A mold and continue up
until it clamps closed with up to 20 tons of toggled clamping force.
The A mold slides loosely on shoulder bolts. As it clamps, the nozel
is activated and a preset amount of wax/plastic in injected. Pressure
valves allow for a timely dwell time to be set until it releases
pressure and everything starts to open. On the up stroke, the
ejecting pins will slide down into the mold and will be flush to the
surfce during injecting. When it opens and the B mold comes to the
home position, the ejector plate is activated and the spring loaded
pins will push clear of the surface and therefore eject the part.
Sometimes the pins will become part of the design and may protrude
above the mold surface, therefore creating shapes on the back of the
piece, and not necessarily round in section.
B) This following example is a vacuum fixture for making plastic
packing sheets for hypordermic needles with syringes The slight gap
between the fingers and the plate is where 98% of the air is
exhausted thus creating the suction and vacuum pull. It looks big,
but it is only.5mm (.02"). The other 2% is pulled through the 2 small
holes in the slot that creates some ribbing in the final product
As it stands today, I am unable to offer these services, as we are
beyond capacity on other projects.