Answer
The distances of the horizontal lines and the distances of the vertical lines must both be multiples of the sum of the lengths given in the dash-gap list. Otherwise it will look irregular.
Give as many dash and gap lengths. Zero is acceptable. You didn’t insert the second gap length, Illustrator sets it as it wants.
An example: dash-gap list 0,5mm/1mm/0,5mm/0mm has sum = 2 millimeters. It allows line spacings 2,4,6,8,10…(etc) millimeters. Here’s an image where both horizontal and vertical line spacings are 20 mm:
Scaling the grid is possible if you set in Illustrator preferences “Scale strokes and effects” ON at least when you scale. Line width can be changed with no harm.
You are not limited to preset dot shapes. Use your own shape as Scatter Brush
Here a 0,5 millimeters wide square is dragged to the Brushes collection and defined to be scatter brush with 400% (=2mm) repeating period. It’s applied to lines which have spacing = 12 millimeters.
Attribution
Source : Link , Question Author : tukang donlod , Answer Author : user287001