Archive for the ‘General’ Category

Tips for Customers and Engineers Who Want Vapor Polished Plastic Parts

Thursday, October 29th, 2009

Here is set of photos showing the progression of vapor polishing a plastic part.  The first shot is of the part before polishing.  The second is during vapor polishing.  We only polished half of it to show the difference in finish that vaporing can offer.  The final photo is of the part fully vapored.  Many potential customers ask about having us vapor parts that they machined.  Normally, we do the machining in house but we also offer vaporing as a service.  The thing about vapor polishing though, is that any surface imperfections can be magnified.  For example, if you give us a piece of machined acrylic, ultem, or polycarbonate that has heavy feed lines or chatter, the vaporing will bring out the poor finish.  The truth is, poor finish in = shiny poor finish out.  If your machining is fundamentally good and your surface finish is smooth, vapor polishing can brilliantly polish your plastic parts.  Engineers and Machinists should also know that overly aggressive machining can impart stress in the finished parts.  This can be problematic during the vapor polishing process because the parts may end up with crazing visible inside the material or on the surface.  Ultimately, we like to do our machining in-house so we can be sure the parts our customers receive will be as good as possible.  However, If your in-house machining work is strong, you will be very satisfied with East Coast Precision Manufacturing’s vapor polishing service.  Can’t wait to hear from you!

Polycarbonate Handle 01

Polycarbonate Handle 02

Polycarbonate Handle 03

East Coast Precision Manufacturing

Plastic Polishing

Secondary Plastic Machining

About Machine Screw Diameters

Wednesday, September 23rd, 2009

I recently read a good post about nominal screw diameters and hole clearances over at Toolmonger, a blog I personally read. Give it a look if you’re interested. They regularly feature interesting tools, projects, and ideas that engineers would enjoy reading. From Scissors to Shop Class History to Gauge Blocks, they have some great stuff!

Happy 4th of July!

Thursday, July 2nd, 2009

09-06-17-4th-of-july-acrylic

Happy 4th of July from East Coast Precision Manufacturing!

Plastic Machining – Art or Science?

Monday, June 22nd, 2009

Plastic machining is both an art and a science. Plastics can change dimensionally due to humidity, temperature and machining process and there is an “art” to keeping machined components within stated tolerances. All polymers and copolymers react differently to coolant and machining technique- the science required to properly machine plastic.

Plastic can be machined or molded to create plastic components. Plastic machining is typically used for low volume components or components that may have a short life span. While creating a mold is costly up front, each individual component created from the mold is a cost effective way to produce high volume, long life span components.

Machining a plastic component can allow an OEM to test certain materials for reactivity as well as tolerance to stresses. Parts can be turned or milled or both turned and milled. In selecting a shop for plastic machining, it is important that the shop have experience in both the science and art of plastic machining. Plastic only shops in particular will help to avoid contamination with coolants and metal fragments usually found in a metal shop. They are also familiar with both annealing and polishing of your plastic component.

In selecting a shop for your plastic machining, three criteria are important:

  • Does the shop have the expertise and experience to produce your component within your stated tolerances?
  • Does the shop use up-to-date equipment and machining techniques?
  • Does the shop care about quality and producing quality parts 100% of the time?
  • In order to find the answers to these questions, review the company’s web site and talk to their salesperson.
  • Additionally, ask for a sample lot before full production in order to review your component.

Hello World!

Thursday, May 28th, 2009

In the coming days, we at East Coast Precision Manufacturing will begin blogging.  This will function as an online portfolio of work we found both interesting and challenging.  We will also give updates of ways we have found to better serve our current and future customers.  Please feel free to comment on any posts and let us know what you think.

For now, take a look at our website at www.eastcoastmfg.com !