One Sided Molding
Posted: Thu Sep 29, 2011 7:02 pm
Been thinking about this for awhile and I think I am going to give it a try on one of my smaller flasks and if it works well scale up.
What my idea is is to make a molding board of sorts from dense castable, maybe an inch and a half thick and the size of the perimeter of the flask. I would fire this brick then use it as the drag with the part in the cope. Thinking it might work out well for a few parts and save a drag on every one cast. Two concerns are the aluminum eating up the refractory making it rough an just cracking it when pouring the aluminum onto it while cold.
Along these same lines I have also been thinking about getting some thick steel plate cut for the various flask sizes and using that. Of course the refractory would be cheaper and I have some on hand so I will try it first.
What my idea is is to make a molding board of sorts from dense castable, maybe an inch and a half thick and the size of the perimeter of the flask. I would fire this brick then use it as the drag with the part in the cope. Thinking it might work out well for a few parts and save a drag on every one cast. Two concerns are the aluminum eating up the refractory making it rough an just cracking it when pouring the aluminum onto it while cold.
Along these same lines I have also been thinking about getting some thick steel plate cut for the various flask sizes and using that. Of course the refractory would be cheaper and I have some on hand so I will try it first.