Answer: He grinds out graduates who are similar to each other as if he were running a factory.
Step-by-step explanation:
Mr. Thomas Gradgrind is the notorious school board Superintendent in Dickens's novel Hard Times. He is committed to the pursuit of a profitable business. The use of Gradgrind as a surname follows Dickens' habit of representing people from the merchant class as grasping and selfish, dedicated to grinding down workers without fair compensation or any clemency.
His name is used commonly to describe people who are hard and exclusive concerned with facts and numbers.