It could be there is an excess of draft on those cores, so much so, that in usage, the fitting is loose on the pipe at the mouth end.
Unless the pipe is sized to just fit into the open end of the fitting. Then, solvent plus a whack with a hammer will ensure a tight seal.
Doo you think the glue line is in the face of the counterbore ? Many times the pipe cut is not square.
Buy all the cheap Pakistani fittings you want, I'll stick with proper expensive fittings.
Oh, and make sure the cheap Pakistani pipe too....it comes with a little hammer...
I'm sure that at some point in our country's history we had similarly "informal" production methods. Except that here the work was done by people we kidnapped from Africa, packed into boats like sardines, and enslaved. Great way to keep costs down.
I will make a prediction now, call it scientific.
IMHO you're about 10-15 years late on this prediction, this has been happening for a while now. ..................
As for the greater machine theory, the machines themselves are just one tiny part of a rich tapestry of fields, industries, services, people, etc. that comprise a modern industrialized nation. For the most part there's no such thing as just dropping an advanced machine, or production facility, or power plant, or whatever, into a destitute country with a largely uneducated populace, and thinking it's going to solve anything. You need people who know how to run the machine, you need people who can run mold flow simulations to take full advantage of its capabilities. You need other machines to create the molds. You need experienced tooling engineers who know how to do that. They need to run CAD. They need modern computers. The machines require tooling, maintenance, lubricants, spare parts, clean stable power, nice sturdy flat floors to sit on, etc. It goes on and on as most of you know better than I do.
I disagree with "no pressure" look at a 2 story house, and that drops down to the basement, makes that 90, thru a trap, and thence out to the sewer.
And then it gets plugged.....24'-30' of head pressure.
As for the greater machine theory, the machines themselves are just one tiny part of a rich tapestry of fields, industries, services, people, etc. that comprise a modern industrialized nation. For the most part there's no such thing as just dropping an advanced machine, or production facility, or power plant, or whatever, into a destitute country with a largely uneducated populace, and thinking it's going to solve anything. You need people who know how to run the machine,
Here's a link to a Youtube video I just watched, that is a nice reminder just how crude a plastic injection mold and plastic injection molding can be and still make some sort of usable part.
Production of Pipe Elbow || Incredible Technique of Making Elbow || Pipe Fitting - YouTube
For all of us who've been moldmakers it's pretty cringe worthy because it's incredibly rough and violates most of the rules we learned about our trade.
For those who are Prima Donnas about how special they are, it's a nice reminder to the rest of us that the tenths they pretend to split are not always necessary tenths.
For those who really do build high end tooling, it's a nice affirmation of the vast gap between a "mold" and a mold.
I especially liked the process control around deflashing the parts and trimming the sprues...high end and OSHA approved if I do say so myself!
Implant Mechanix • Design & Innovation > HOME
Vancouver Wire EDM -- Wire EDM Machining
Do you happen to have a procedure or process for for machining molds? Is there step by step guide reference book somewhere one can use? I have a mold trying to machine. I have CAD done now trying to generate tool paths and wanted to get input from experts here. I know detail is last thing that’s all.