[Noisebridge-discuss] Lost PLA casting

Torrie Fischer tdfischer at hackerbots.net
Sat Aug 9 01:34:06 UTC 2014


Heya, noisebridge :)

For the Noisebridge indiegogo campaign, we're supposed to be making a big 
bundle of noisebridge keys on the CNC mill.

To make sure its an easily repeatable task, I'm producing a lost PLA mold for 
a jig that will hold keys in a uniform position on the mill.

I'm looking for a small furnace for PLA burning and aluminum melting if 
someone might have one pre-built and available for me to use sometime next 
weekend, along with a ladle and heat protection. I'm creating the plaster 
molds myself this weekend from some models I printed earlier today.

Here's a quick picture of the prototype with a previously milled key:

https://pbs.twimg.com/media/Buju3kZCQAE4xmw.jpg

The next iteration will include registration marks for mill alignment, tweaks 
to to counteract dimensional changes due to thermal expansion/contraction in 
the final casting, a vapor bath, and other bug fixes.


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