I made it at Techshop. http://www.techshop.ws/
This is my version of an Equal-Arm Beam Balance Micro Scale. It is 24 inches long, 2 ¾ inches wide and 8¼ high.
Step 1: Aluminum I-beam Level
I wanted a stable foundation to use and mount the hardware to. I looked at several materials and came upon this aluminum I-beam level.
I removed the center bubble holder and tube.
Then I flipped (reversed direction) one of the bubble mounts to use as the Y axis leveling, leaving the other end for the X axis leveling.
Step 2: Creating the legs
I am using threaded furniture glides for legs. I followed the drilling instructions for hardwood installation. I used a 3/8 diameter drill to create the holes.
Remembering some old milking stool logic my grandfather told me, I am using only 3 legs. I put 2 for the x axis end and 1 for the y axis.
I hammered in the treaded inserts in reverse of the traditional application. I wanted the inserts to protrude down from the I-Beam to provide strength and stability. This also gives a cleaner appearance to the table of the I-beam.
Step 3: Center Support Rod Mount
I wanted to thicken the center support rod mount cross section. I used ¼ inch Delrin plastic for the top plate cut to 2 X 3 inches. I used sheet aluminum for the bottom plate cut to 2 X 3 inches
The bottom item shown is my index card template. I transferred the razor blade hole spacing on to the template. 2 blades will run on the y axis and 1 on the X axis.
Planning on using 1/8 diameter thread rod, I drill oversized holes by using a 5/32 drill. The removed bubble mounting hole in the I-Beam posed a issue for the support rod hole positioning. I ended up just filing some of the I-beam hole edges for the thru passage of the rods.