This was a real pita to mold. It took several attempts, eventually I added a little more water to the sand, and pushed 3" nails into the centers of the high spots to hold things together.
Here you can see one of the many failures. It was fine until I flipped it over to close the mold. By now I've learned to flip the cope above the sand box, rather than above the drag, a lot less cleaning up to do.
The nails helped a lot, but so did adding just a little more water.
I used steel pins to align the two part of the mold, a bit of trial and error on a small sample helped me to figure out the right sized holes. 3d printed pins are ok, but the tend to catch more on opening the mold.
The pour went well, it was a lot of metal probably the second biggest pour I've done.
It's always fun to see what comes out, this was done the next day when it was cold.
Not a bad result, they will need some cleaning up, and I'll need to drill out the hole for the axle.
You can see how much shrinkage there was in the riser, without such a big riser direct attached to the part, it would have had a similar sized shrinkage defect on the hub.
No comments:
Post a Comment