Do anybody tell me what is the definition of micro part? Is it
classified by size or by weight? E.g. A product of 1mm in size can be
called micro part. Compare to it, a product of just 0.1mm is also
called micro part. The processing method, however, may be totally
different. So I think classification is necessary. But how to
classify? Any website has such information? Thanks
I agree, it would be nice to have a definition. But because the term is
rather new, I have a feeling that a precise definition has not been
established. Sure, everyone is talking and writing about it, but I
haven't seen a definition yet. They are even going further and
discussing "nano molding", which I guess is smaller than "micro
molding". I recently read an article where micro machining involved the
use of cutters small than 1/4 inch in diameter. That's not very
descriptive. There are a couple of links below you might explore, and I
hope you will post any info you gather on the subject.
We have a micro molding process that yields about 7 parts per pellet of PET.
It has a .007" dia x .020 deep blind hole in a .020" overall diameter.
Couldn't use hot runners, as the parts needed to be removed with the sprue
or else we would lose them......
Sounds fascinating. Have you got pictures? And do you offer a definition for a
part? In an article by another molder, "Nanotechnology is 10 to the-9,
but micromolding is serving the 10 to the -5 or -6 market at this time."
I don't quite understand as there were no units of measurement
That would be great. A point of reference is always nice but as long as some
are given, it's not all that necessary. How about that definition? Care
to take a stab at it? I know it's probably not that important, but an
interesting challenge, especially for those of you who are actually
producing "micro parts". I guess the rest of us are making "macro
parts"? And how about those "nano parts"?
I actually sent a cut out home from work, but it only came through as an OLE
Well, any way... let me use my crude ansi drawing skills (almost as good as
-----------| --------| ----------
| | | | .007" x .012" deep
------------| --------| ----------
Major OD is .0125", minor OD is .008"
Close enough! But if you do get a pic, send it on.
I found one molder who provides a definition of micro molding, sort of:
"Although much debated, most define micro as less than 1/8 inch."
The quote is from: http://www.miniaturetool.com
They claim to have the "Smallest Micro Molded Component in the World!"
"520 parts per plastic pellet!" They show it next to a penny but it is
By the way, I have a cheap microscope which connects to the computer so
you can produce pictures (jpegs). If you have an extra micro part laying
around send it to me and I'd be happy to get you photo if you care to
sf email@example.com (Chris) wrote in message
We (the ones that you call "they") are working on that classification
scheme, but we are still struggling with the nomenclature scheme
first. After all, poly vinyl alcohol implies that it is made by
polymerizing vinyl alcohol (just try buying a 55 gallon drum of vinyl
alcohol from Aldrich!) We still can't decide if we want to go with a
final struture based system or a monomer system, even if the end
points are the same (hydrogenated polyisoprene is the same as
After that's all worked out, then we have to work on polyesters,
polyamides and all the other condensation polymers that are only named
by the linkages with no regard at all to what's in between. (That's
why a polyurethane can be a bowling ball, a soft foam and anything
between the two.)
So please be patient. It's taken us nearly 100 years to get this far,
but we are making progress.
I have got some information about the definition. Hope it will be
helpful. Basically, the size of a part can be defined by its dimension
or weight. If defined by its dimension, then a micro part should be
at least one dimensional feature of less than 1mm. However, it does
not make sense because many plastic part (e.g. plastic toys) have such
dimensionl feature. So, it should be better to define a micro part by
According to Battenfeld, a part can be called micro part if its weight
is less than 0.1 gram. I think this definition is clear and make
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