Brian, et al,
Lots of good discussion already. Purportedly, the standards contain
the needed technical requirements to demonstrate that the construction is
adequate. The printable material must be controlled in the usual way to
ensure an adequate basis for the needed final properties - mechanical,
electrical, etc.
My project experience with printed parts led to lots of discussion
with the test house engineer who needed to be convinced that the proto parts
would be replaced with molded parts in the next build. Led to some
interesting conversation and consternation for the company team but all was
worked out in the end.
Else I agree with John's initial point, remove '3d printing' and it
reads like the list of risks that any manufacturer deals with.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety & Regulatory Affairs Consultant
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201
p.perk...@ieee.org
-----Original Message-----
From: Brian O'Connell [mailto:oconne...@tamuracorp.com]
Sent: Monday, March 27, 2017 9:57 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] 3D Printed Parts
"...how the part is made?" -> the manufacturing process and technique? Stuff
from the ASTM has a little of this, but are typically materials test methods
used to verify the result of the manufacturing process. Otherwise
'manufacturing' standards seem to be for the assembly of equipment. For
example, ASTM F2946 does not talk about how to make a pipe seal, but does
cover materials selection and assembly requirements for some types of seals
for plastic pipe joins.
There are common tests like melt-flow index that can be done pre and post
injection to verify the chemical changes of thermoplastic polymers resulting
from the molding process. These test methods, and the myriad stuff in the
UL746 series, could be indicative of the effectiveness of the manufacturing
process, whether injection molding or AM.
Some of the environmental standards indirectly effect the manufacturing
process by eliminating or encouraging a process due to chemical restrictions
of resultant by-products.
Then there is UL, which seems to have dived into AM during past several
years; they have AM manufacturing process and technique audits as part of
their FUS. They seem to be running the ASTM F42 committee. Do not know what
TC261 has done lately, but both have been active for 5 to 15 years.
Travelers' Insurance is not saying anything new, they are just now realizing
the size and breadth of the AM market and want a piece of the pie of
something that has been growing for about 20 years.
Brian
From: Richard Nute [mailto:ri...@ieee.org]
Sent: Sunday, March 26, 2017 1:56 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] 3D Printed Parts
Hi John A:
Still looking for opinions on the question though - do our Standards
consider how the part is made?
Consider the Y capacitor. It must comply with the requirements in IEC
60384-1. Type and routine tests. Same as for a finished product.
Supposedly, routine tests address the consistency of how the part or product
is made.
Best regards,
Rich
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