Good measurements to know

 Ok, I just wanted to try sounding smart so I found some lego measurements that real pros use 

The following pics are the best summary of Ldraw and mm measurements 

Above 2 pics from Robert Cailliau.eu

Image from brickgun.com (posted on Pinterest)

L Draw units are 1.6mm each

These measurements are what are needed to make Bitbeam, a form of custom made technic beam

Now I need to learn 3d printing!!!!

Slight variations in 3/16 =4.78 but below=5mm

3/32=2.38mm but below 2.5mm

1/8"=3.18mm or 3mm below

7/32"=5.56mm or 5.7 below

Now I see why the pics from my 9/7/21 blog entry makes sense

1/8" = 3.18mm= hand grip=that's why the hand felt so tight, it could be 3mm to 3.18mm

7/32=5.7mm to 5.6mm around a 4.8mm stud that dropped to 3.0mm in the tube

3/16 =4.78 but below=5mm

4.8 is the size of the hole so 3/16 went in perfectly

So hopefully I sound smart ha ha! Or confusing as heck

But now I see why there are both metrics and non metric displays at hardware and hobby stores.

For more detailed articles see

1) LEGO 3.18 mm connection analysis by New Elementary [Guest Post] - The Brothers Brick | The Brothers Brick

2) the rambling brick blog has info on 3.18 measurements