2016-10-15 22:33 GMT-03:00 John Kasunich <jmkasun...@fastmail.fm>:

> Injection pressure will be trying to force the two sides of your mold
> apart.
> That's why injection molds are made of tool steel, and injection machines
> have VERY sturdy construction to hold the mold closed.  I saw a machine
> that might be big enough to make your parts - the mold closing cylinder was
> about 2 feet (0.6m) in diameter, and the four steel tie-rods that held the
> machine together against the clamp force were about 100mm diameter.
> Could you make it out of four strips with some kind of joining at the
> corners?

Hello John.

Yes the idea is to machine the four strips and then joing them strongly. To
clamp the mold I was thinking about mechanical ways like eccentrics or may
be screw clamps. That way I can hold the mold together when the injection
takes place. I really don't worry about the time consumption on open the
mold and close it again.

The concerning part I have is if It's a good idea to move the pistons for
the injection with a screw and a common 3 phase AC motor. My idea is to
load the piston, wait for the plastic to reach the temperature and then
inject no less than 30 seconds. I probably have to preheat the mold too.

*Leonardo Marsaglia*.
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