On 15.10.16 22:44, Leonardo Marsaglia wrote: > 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.
<2c> If joining by solvent is too weak or unsightly, have you considered "pvc welding"?. I haven't used the process, but google offers myriad hits. I've seen ΒΌ" thick PVC with a rippled joint looking much like a weld in steel. It may have been done on both sides, though, for complete penetration. (I don't recall.) OK, if molten plastic injection into the joint were a viable option, then the mould restraining force would be _much_ less than if moulding a large flat object from scratch, but just clamping four sheets for welding is orders of magnitude simpler & cheaper. I can't imagine that plastic welding gear is in the same ballpark as injection moulding, either. I suspect that molten filler material would need to be run straight from nozzle to every point of joining, i.e. run a nozzle along the joint. If injected at a central sprue, it would be too cold to melt the PVC strips for adequate fusing. (But that is speculation.) </2c> Erik ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
