Hello all,
I’ve had my Form2 for a little over a hear now and have been working almost exclusively with the Castable Resin and Castable Wax resins. I am teaching myself jewelry casting as I go, so please keep that in mind as you look at my issue.
I’ve been getting pretty consistent porosity on my sterling silver casts lately using Castable Wax. I’ve included links to a couple of pictures showing my most recent casts. After reading through a lot of similar posts here and elsewhere I’ve come to the conclusion that the results I’m seeing are due to an incomplete burnout.
Cast 1: https://drive.google.com/file/d/12jE3iN6HVZJ7sCjDcOGPx77vdD-JnKq2/view?usp=sharing
Cast 2: https://drive.google.com/file/d/12jwhas80yHE8_YZ44mP7nPNInwKXhSD4/view?usp=sharing
For the record, I’m using R&R Plasticast as the investment, and following the FormLabs recommended burnout schedule. Two modifications I made for this burnout was to extend the peak hold to 4 hours and raised the peak temperature to 1380 F. Final flask temperature was at 954 F.
The kiln I use for the burnout is a Paragon SC2, with a single vent hole at the top. Before this run I created three vent air channels at the bottom of the kiln door to improve air circulation.
Casting was via a home-made vacuum table, using an acetylene torch for heating the silver. Silver was a 50/50 ratio of new casting grain and previously cast silver. Any feedback would be greatly appreciated.