Modulus 3, tooth number 45, what is the diameter of gear bore?
That is to say, the distance from the inner keyway to the root circle is more than 14.125mm.Can satisfy the demand of modulus and 3 force. This shows that, the key hole, the hole diameter is below 80 for the selection of good.I think 60mm-80mm is ok.
If the hole has a keyway (and modulus 3 matching, in the dia 80 diameter, generally also need to key width of about 12, from the hole to the depth of the key, the farthest point is generally 7mm, for safety sake, according to 10mm count. [128.25- (80+10 * 2)], 2=14.125)
Root circle diameter = modulus * (tooth number -2.25)Root circle diameter =128.25
