11-11-2012, 05:32 PM
I'm still playing around with these grips. and since its to wet and not that cold but anyway me and the little dog are hold up in the house so I thought I would post up a couple pictures of some of the problems that something simple like this can cause a person.
This first photo shows a spot on the what is the bottom back of the grip that is really rough, this was caused by the part moving in the flask when I rammed it up. that corner ended up almost touching the flask with only a few grains of sand to seperate the flask from the part.
The spot up at the top that is really rough was caused by the metal going cold, not sure but thats what it looks like cause the part was poured with that side up so I don't think its from loose sand but it may be.
![[Image: grips002.jpg]](http://i1222.photobucket.com/albums/dd484/Superdave257/grips002.jpg)
This second picture shows where I had what is termed the gate or where the metal flows into the mold. I had it at what is the bottom of the grip but am thinking that I may need to move it up so that its in the middle of the part, reason for moving it is that I have had parts that were poured closer to the middle that didn't have the rough area what is showed in the first photo.
![[Image: grips001.jpg]](http://i1222.photobucket.com/albums/dd484/Superdave257/grips001.jpg)
Oh yea almost forgot these were molded in silica sand and sodium silicate and hardened with CO2 gas I used 5% SS, this gave a very good mold and the part wasn't all that hard to remove, texture of the checkered part on the grip was pretty good, its a little messed up around the two recesses where the bolts go but most of that gets machined out anyway. I filled those two spots with wax so I could have a tapered slope in them so the sand would pull out.
anyone with any idea throw em out, it'll give me another reason to fire up the furnace
DA
This first photo shows a spot on the what is the bottom back of the grip that is really rough, this was caused by the part moving in the flask when I rammed it up. that corner ended up almost touching the flask with only a few grains of sand to seperate the flask from the part.
The spot up at the top that is really rough was caused by the metal going cold, not sure but thats what it looks like cause the part was poured with that side up so I don't think its from loose sand but it may be.
This second picture shows where I had what is termed the gate or where the metal flows into the mold. I had it at what is the bottom of the grip but am thinking that I may need to move it up so that its in the middle of the part, reason for moving it is that I have had parts that were poured closer to the middle that didn't have the rough area what is showed in the first photo.
Oh yea almost forgot these were molded in silica sand and sodium silicate and hardened with CO2 gas I used 5% SS, this gave a very good mold and the part wasn't all that hard to remove, texture of the checkered part on the grip was pretty good, its a little messed up around the two recesses where the bolts go but most of that gets machined out anyway. I filled those two spots with wax so I could have a tapered slope in them so the sand would pull out.
anyone with any idea throw em out, it'll give me another reason to fire up the furnace
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!