I can't share images of the parts unfortunately but there is a picture of the cracks up above (I think). It is pulled down over a plug, over some epoxy tooling and the cracks started near the surface that touched the plug. We discussed with the vendor about this and they do agree the tooling...
I guess in all fairness, the PC did not do well in the molding process, had a lot of crazing occur, but in contrast to the actual cracks seen in the ABS, I would have to call it an improvement. We are open mold vacuum casting a PU mix. It is not a RIM urethane process, but the mix is somewhat...
btrueblood, thank you! That is the kind of insight I was hoping to get from the vendor as I am typically far removed from the polymer game. I will check the mold release as well for those types of compatibility issues. The other molds were done on the same tooling but with different materials. I...
That's what I suspect, but can't seem to get the vendor to agree to the issue(CYA issues likely). The part has roughly a 5in depth over a 10in width. Running sheets at 0.25in stock thickness. We have measured the thinning down to only 0.2in at the deepest regions. It is performed on male...
Yeah I guess that's the underlying question, whether or not its a process or material issue. The vendor says it can be "mitigated with proper tooling" but its difficult to justify that type of investment if we can't get it to work at the current level.
Our crew recently ordered some thermoformed ABS two-part, open cast molds for some rough prototyping with a urethane material but ran into some strange issues. It appears that the ABS has small hairline cracks running up and down the part in corners and radii of the geometry. This is usually...
