Bonjour
Si 7/5 de tour est égal à 2/3 mm
3 tours = (3 x 2/3) : 7/5
= 6/3 : 7/5
= 6/3 x 5/7
= 30/21
= (3 x 10) / (3 x 7)
= 10/7 mm.
