The 12-inch DJ-30 jointer is fitted with a three-phase, 3-horsepower motor. Delta's 8-inch DJ-20 features a single-phase, 1.5-horsepower motor. The 6-inch professional includes a single-phase, 1-horsepower motor.
As its name implies, the 12-inch DJ-30 offers a 12-inch cutting width. This model also offers a 3/4-inch cut depth capacity. Cut capacity width on the DJ-20 is 8 inches, while cut depth is 5/8 of an inch. The 6-inch professional offers a 6-inch cut capacity width and a 1/8-inch cut depth.
The 12-inch DJ-30 jointer is 84 inches long, 40 inches wide, 43 inches tall and weighs 706 pounds. The 8-inch DJ-20 model is 76.5 inches long, 26 inches wide, 32 inches tall and weighs 394 pounds. Delta designed its 6-inch professional jointer to a length of 28.5 inches, a width of 46 inches a height of 48.5 inches and a weight of 225 pounds.