19 Nov
1997
19 Nov
'97
8:11 a.m.
> Also, the
really cheap PeeCees use screws that are stamped, and not
> turned. This is one of the reasons that fine threads are still used.
Uh huh... not true.
Ummm...yes true. It is really obvious when the dies get worn and a
flashing start to show up, like on a cheap plastic model.
Actual production of screws comes in gress what?
Roll of wire!
Snipped to short lengths by shear action then fed to 2 or 3 machines
then in the end is screws.
Well, yes, I assumed that everyone knew that. Screws have basically always
been made like this. These "ultra-cheap" screws start out the
same, with a head formed exactly
the same way, but then the blank is fed into a two part die that cuts the
thread by "smashing".
Eeww.. Lucky me, I did not find 'em. I
would spot "seam" in a
instant. And toss box of it into grabage. When you talk of cutting
thread it's would be CUTTING. Better to say forming?
They have 2 ways depending on needs and by design: to form threads:
roll blanks between 2 molds, one fixed, one moving in linear motion
under pressure (low quanitity) or constant feed through a circular
mold about 1/4 of the way around with outer mold. (High quanitity)
Rather like children clay being rolled on table and your hands to
makes "sausages" and put impressions in it from both your
fingerprints and the defects in the table.
Troll
William Donzelli
william(a)ans.net