the importance of thermostats

You've proven you don't many times. It's in your language. If you owned and read engineering text books you'd write much more clearly and be able to effectively communicate with degreed engineers. It's simply readily apparent you don't have this sort of background self taught or otherwise.

I find it amusing that he balks at providing bona fides due to a thinly veiled excuse concerning the reliability of credentials on usenet, but is laughably anxious (insultingly so) to offer "proof" here that he has a specific book in his possession.

as opposed to the laughability of two yellow backed clowns that attack strawmen rather than actually take the risk of proving themselves wrong??? you two need to grow a pair.

The projection and irony are stifling.

?????????!!!!!! cojones - you should get some!

Repeated, baseless pretense, not surprisingly, continues to fail.

Mr. Beam, I have no horse in this thread. It simply is a waste of my time to make Beam to engineering translations.

you have no horse in any thread. you never contribute a single damned thing - all you do is wander aimlessly throwing stones at other people's windows rather than doing your homework.

but you can always find time to toss some shit you picked up off the ground. retard idiot.

said the yellow-ass trying to use an electrical analogy for fluid flow. that may "work" in 5th grade, but hardly fits someone pretending to be a "degreed engineer".

While it is a well accepted tenet that there are no perfect analogies, see

to begin to suggest that fluid and electrical flows are not textbook analogous examples is at least as ridiculous as is an offer to prove possession of an article by a statement on a newsgroup. &

And you think that it would include major inaccuracies as a result of that fact?

Brent wrote in news:l1irri$4ll$ snipped-for-privacy@dont-email.me:

Oho, so you had an ulterior motive.

You picked a good one for entertainment: beam is like a foolish fish that just can't leave the bait alone. Plus he HAS to have the last word, so you can keep him going pretty much forever, if you so choose.

That was a very interesting video, so thanks for the link. Now I see exactly what you mean by knit/weld lines. It's obvious that if the lines were in critical areas they would act as built-in stress-risers. and thus as potential fail points. The video is also very illustrative in describing how critical is the placement of the gate(s).

I imagine development of injection-molding must be substantially less expensive and less time-consuming now than it was before Solidworks and related software came out. How'd they do the design before? Educated- guesswork? Tables of some kind?

One thing the narrator didn't address outside of a simple mention was the air-traps detected by the software. How are those dealt with, just by drilling some tiny holes in the mold?

Also, I don't quite understand how /increasing/ wall thickness would /shorten/ cooling times. And I don't understand how shrinkage rates can decline from ~10% to ~1-2% just with a change in the structure. Or was that affected by the change in material from PC to PC/ABS?

Note: My hearing is very poor (I wear two hearing aids). The narrator has an accent, and I am unable to read his lips since he does not appear in the video, so I may have missed a lot of what he was saying.

Tegger wrote in news:XnsA242BAB9EBD23tegger@208.90.168.18:

I just noticed that, after the video played, a bunch of suggested "further reading" links appear to the right of the video screen. My questions are probably answered in those videos. Will watch some later. Apparently there are /home/ injection-molding machines!

It was all experience driven and when things turned out badly the tools had to be changed. Many still do it that way due to the expense of the software. Some places rely on the mold makers to do it. Since I stopped doing thin-walled parts I haven't had to deal with knit lines much. With thicker walls the problem has mostly been warp for what I am working on.

Vents in the mold. Usually thin gaps at the parting line a couple thousandths of an inch. The air gets out but without causing flash. Venting corrections have never been a big deal IME.

Shrink rate is a material property, what he's talking about is how packing pressure and hold time changes the results. The high 10% figure was due to not having the mold packed out properly rather than the material. He does that segment entirely with PC/ABS and the same wall thickness. He's just changing the pressure and the hold time.

Brent wrote in news:l1mhic$bbo$ snipped-for-privacy@dont-email.me:

Thanks. This was quite an education. For me, purely academic, but educational anyway.

It's been amusing watching beam bluster and twist and turn rather than answer questions honestly. I don't know what's happened between 2005 and now, but this jim beam is much more obnoxious than the old one was. The change wasn't sudden, but has been gradual over the years, so I'm convinced this is the same person I used to exchange email with.