See pick the casting is 25...lb the shrinkage is at the top ...welding rod stuck in a blow hole or where it feed for needed material ? So do I need a bigger riser or a feeder?or better venting Thanks Todd
If I was casting that, I would pour the metal directly onto the top of the cylinder that has shrunk. Or better still, if the cylinder is to have a hole machined in it later, I would place a core in the mould to form a hollow cylinder, Cheers Charlie
Your better off just adding a riser right to the top of that thick section. Blind riser would be best imho..
I'm assuming that is cast Fe ??? if there is going to be a hole there, you definitely want to use a core more for the improvement of the grain structure then for feeding , otherwise you will need more riser then you can get in that flask .if the piec is 7 inches tall, you need 4 inches of riser, looks like you only have a couple of inches of cope to spare any reason your sprue is so dern big??? definitely do not try to pour directly down the center of that casting with cast Fe you will get erosion, but if you use an open riser, you can top the riser with hot metal to help it feed once you know you are filling the riser, and not the casting V/r HT1
Sprue is so darn big cause I was hoping it would feed from it ..lol no no it won't If I core it it would be difficult to re assemble the box as I have only 2inches of depth in the bottom and would be blind putting on the top box ...there is 3 The split is where the large piece comes out approx 1/2 way up . ......but if I taper bore the top half I might get away with a green sand core ...... I like the topping off the riser to ..... Thanks HT1
I don't have a problem with wash on my castings, but that could be because I don't pour iron. Interesting thought! Cheers Charlie
How in the heck did I end up with a blow hole here This is my 4 one poured all the same no trouble with them Thanks Todd
