Multiframe has a built-in facility to allow you to have your drawing automatically align with an evenly spaced grid.  You can control the spacing, display and use of this grid with the Grid…  command from the View Menu.

§    Choose Grid… from the View Menu

§    Enter values for the x, y and z spacing of the grid

§    Click on the Visible checkbox if you want the grid to be displayed in the Frame Window.

§    Click on the Snap checkbox if you want drawing to align to the grid.

§    Click the OK button

If you want to have the joints automatically align with the grid, but do not want to see the grid, simply unselect the Visible checkbox button before clicking OK.  Similarly you can select the Visible checkbox to have the grid displayed as a visual guide, but unselect the Snap checkbox to disable the automatic alignment with the grid.