Used to pack my flask sand with a flat rammer, switched to a curved one after a casting at the Milwaukee shop came out with a weak spot.

3 comments

3 Comments

Curved rammers just make more sense for flask sand. The shape fits the mold better and gets into the corners a flat one can miss. That weak spot was probably from uneven packing pressure. A flat rammer can leave gaps along the edges. It's a small change that fixes a big problem in the final cast. Good call on making the switch.

rowan_wells309d ago

Used to think a flat rammer was fine for most jobs. But seeing how a curved one just follows the flask shape changed my mind. It really does get that even pack you need.

spencer4009d ago

Man, you're totally right. I've seen that exact thing happen. A flat rammer leaves those little pockets of loose sand right against the flask wall. Then when you pour, the metal finds it every single time. It's such a simple fix but it makes the whole mold feel so much more solid when you're packing it.