CR4® - The Engineer's Place for News and Discussion®

Previous in Forum: Concrete for Sidewalks   Next in Forum: How to make Material selection of pipe
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
3 comments
Rate this Comments: Nested
Michel (NPI Engineer)
Participant

Join Date: Mar 2008
Posts: 2

SPI's mold surface call-out equivalent for "Diamond Polished Optical Clear"

03/27/2008 3:52 PM

I'm looking to complete a plastic injection part dwg., and I would like to find an equivalent SPI mold surface finish call-out (i.e. A-1, C-3, etc...) instead of using words such as "Diamond Polished Optical Clear".

Michel
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".
garyceng
Power-User
United States - Member - New Member Popular Science - Weaponology - New Member

Join Date: Apr 2007
Location: North East Pennsylvania
Posts: 331
Good Answers: 7
#1

Re: SPI's mold surface call-out equivalent for "Diamond Polished Optical Clear"

03/28/2008 12:17 AM

A #4 microfinish is considered a mirror polish for molds to obtain an opticaly clear molded part.

__________________
 Men are like steel, if they lose their temper they are worthless.
Register to Reply
2
plaasteek
Associate

Join Date: Feb 2008
Location: Made in USA
Posts: 48
Good Answers: 3
#2

Re: SPI's mold surface call-out equivalent for "Diamond Polished Optical Clear"

03/28/2008 10:20 AM

The best way to define the mold finish would be to specify "SPI A-1, Optically Clear Mold Finish." Now, this could also be specified as "SPI A-3" because it depends upon the material being molded, as with polycarbonate. It is best to check with your material suppier for the finish they recommend for their product to be molded. Too high of a finish can create material sticking and other molding problems.

I included a reference chart where you can visually see the recommended SPI finish for the material being molded.

__________________
 "Imagination is more important than knowledge. Where knowledge is limited, imagination encompasses the Universe"
Register to Reply Good Answer (Score 2)
No more Good Answers.
Michel (NPI Engineer)
Participant

Join Date: Mar 2008
Posts: 2
#3
In reply to #2

Re: SPI's mold surface call-out equivalent for "Diamond Polished Optical Clear"

03/28/2008 1:03 PM

Thank you. The chart was extremely helpful.
Register to Reply
Register to Reply 3 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".
Copy to Clipboard

Users who posted comments:

garyceng (1); Michel (NPI Engineer) (1); plaasteek (1)

Previous in Forum: Concrete for Sidewalks   Next in Forum: How to make Material selection of pipe

Advertisement

"To follow, without halt, one aim: there's the secret of success" -- Anna Pavlova

All times are displayed in US/Eastern (EDT) (Register to change time zone)
© 2018 IEEE GlobalSpec. All rights reserved. Reproduction in whole or in part without permission is prohibited. The information contained on this site is by users for users and is provided for information purposes only and does not constitute advice. Any views or opinions expressed by users are personal to them and do not represent the views or opinions of IEEE GlobalSpec. You should check any information and use your own judgment or seek expert advice before doing or not doing anything on the basis of what you read here. IEEE GlobalSpec does not verify or warrant the accuracy or completeness of any information on this site and, to the extent permitted by law, IEEE GlobalSpec shall not be liable for any loss, damage or expense incurred by reliance on it or for any dealings you have with users or other third parties that take place using or facilitated by this site.

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Mechanical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (85 right now)
Show Members
Advertisement