[Noisebridge-discuss] Lost PLA casting
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:
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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