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Creating dimensions across an axis

Question asked by Philip Antoniou on Aug 9, 2017
Latest reply on Aug 9, 2017 by Philip Antoniou

Hi. The sketch below will be used with a revolve to create a hollow tube with 3.5mm internal diameter. To get a 3.5mm internal diameter I need to create a dimension of 1.75mm as shown. I remember once reading a trick which would allow me to show the dimension as 3mm, I think it involved holding some key when creating the dimension. I think it then shows the dimension as being across the x-axis. Does anyone know what I mean? And recall how it's done?