Erhart has been a family run sand cast iron foundry since its conception and is now currently headed by Zach Erhart, the sixth generation owner.
The sand cast iron process is a tedious one. It requires attention to detail, especially at Erhart, where almost everything is done manually.
Erhart outlived other foundries to be the oldest foundry still in business, because they analyze how their products are made and take into account extra vents, additional geometry and casting concerns upfront and charge accordingly. They think about the job in advance and plan well.
Sand casting iron involves many different tasks and each of those is integral to achieving a good cast. The tasks are divided into pre-process, the pour, and the post processing. Pre-process tasks include pattern making, sand mold generation, venting and pattern removal. Post process tasks include breaking the mold, shot blasting, grinding and finishing.