So, back to the original question about what MOD means. Well MOD is the ratio of the pitch circle diameter (PCD) to the number of teeth. DP for imperial gears is the number of teeth per one inch of pitch circle diameter. So whilst that may well answer the question, it doesn't really help appreciate the size of a gear.
doer. n. 1. a person or thing that does something or acts in a specified manner: a doer of good. 2. an active or energetic person. 3. a thriving animal, esp a horse. (Ëdu Ér). n.
Save the planet! The proud and noble English surname of Doe originates with the Norman French Castle of O, and means from O. Some of the Doe family held a family seat at Lancashire from very early times, and were granted lands by Duke William of Normandy for their activities at the Battle of Hastings in 1066 A.D. 1 person found this useful.