What's a fast tool for polishing cast iron? What is the best machine to use for high volume production? Manual labor is definitely not possible, is there any other better suggestion?

The best way to polish cast iron is on the automatic grinding machine, foolproof operation, as long as the casting to the machine a put, the door closed, it automatically began to grind, grinding the finished product is also automatic material. A person can operate 2-3 machines, a machine can top 3-6 skilled workers. Guiye casting automatic grinding machine can help you, suitable for mass production.