gearguru,
Thank you firs of all.I found late but there is no problem.I divide 25,4/m and then divide it by 25,4 to inch and i get what i need called DP :)
Dp*m=25,4,you are correct.
dinjin,
? just understood as i told gearguru above.Now,i can draw with using module or either D.P.The problem...