Archive for the ‘PTFE’ Category

One of the few PTFE applications that brings in the DIY community consistantly to a plastics distributor is the application using sheet material cut into discs as mountings for telescopes. PTFE is the third slickest solid known to man and works well as a sliding surface. It does have very low load-bearing capabilities and is subject to “creep” (dimensional changes at rest) and also cannot handle much wear at all. In short, there are only specific instances the material makes sense – especially due to its high cost compared to most other plastics used in DIY applications.

We recently came across a blog posting from an amateur astronomer (“Chris B.”) chronicling his progress in making telescope mountings from PTFE. He gives some pretty handy tips such as how to cut the material precisely into the desired disc and to keep it from moving around. We don’t really have experience in this area so it’s probably best to let Chris’ work speak for itself. You can find the blog here: https://fullerscopes.blogspot.ca/2016/08/2-shaft-mouting-pt28-ptfe-clutch.html

Machining PTFE

Posted: April 26, 2013 in machining, PTFE
Tags: , , ,

The flouropolymer PTFE (polytetraflouroethylene) AKA “Teflon” is one of the most popular engineering plastics. Considered a bridge plastic to the “High-Performance” plastics it is one of the best plastics readily available for everyday use. PTFE has a number of advantages, including being one of the slickest solids known to us, but it is also very soft and has poor impact resistance. We highly recommend you do your research before selecting it as a material and learn how to work with the material. Mistakes can be costly, as PTFE is one of the most expensive plastics available.

This short video does not provide specific technical assistance but the person hosting the video does a quick rundown on the beneficial properties of the material and he quickly lathes a bearing showing a little of how the material is worked with. We also have a machinist chart which includes PTFE located here.

 

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