09-26-2013, 10:23 AM
moisture content in greensand was a battle that I don't want to have to deal with again, here just a while back when I moved my muller I mixed up some and with the heat of and Oklahoma summer I was fighting the moisture in it, so I went back to using oil bonded sand.
with your muller that you say your going to build you shouldn't have too much trouble with moisture in the sand your biggest hurdle will be to understand when you have enough water in it and then quit putting any more in. if you see dark spots in the sand after squeezing some in your hand or clumps in the tub you have too much moisture in it.
as far as control goes you will probably have to adjust everytime you go to mold up a pattern. the plastic is find but don't DUMP HOT sand into it, the concrete laundry tubs a lot of people use them if they can find them cheap, heck if I could find an old cast iron bath tub I'd use it cause of the amount of sand that it can hold. My problem is I don't (too lazy to build one)have a molding bench I mold on top of my muller.
anyway build your bench strong, if it wiggles when you try to shake it, ramming molds on top of it will tear it apart.
DA
with your muller that you say your going to build you shouldn't have too much trouble with moisture in the sand your biggest hurdle will be to understand when you have enough water in it and then quit putting any more in. if you see dark spots in the sand after squeezing some in your hand or clumps in the tub you have too much moisture in it.
as far as control goes you will probably have to adjust everytime you go to mold up a pattern. the plastic is find but don't DUMP HOT sand into it, the concrete laundry tubs a lot of people use them if they can find them cheap, heck if I could find an old cast iron bath tub I'd use it cause of the amount of sand that it can hold. My problem is I don't (too lazy to build one)have a molding bench I mold on top of my muller.
anyway build your bench strong, if it wiggles when you try to shake it, ramming molds on top of it will tear it apart.
DA
dallen, proud to be a member of MetalworkingFun Forum since Apr 2012.
If life seems normal, your not going fast enough!
If life seems normal, your not going fast enough!