Type 140 Knee Feeds (SERVO) With the Type 140 knee feed, you eliminate tedious hand cranking. This feed offers variable speed with a range of 3/8 inch to 15 inches per minute and 140 inch-pounds of torque. Helical gearing, an internal clutch and improved universal motor make this the standard for Class I mills up to 2-1/2 horsepower. Made in USA.