How to Build a Wiremap

Step 10 Prepare your thread

First, we have to find out how long each thread should be. Take the image height at the mapline, and add 8" to it.

The image height of the projection at the mapline is determined by your mapline length and the projector's aspect ratio.

Mapline length / image height = projector aspect ratio.

So, in my case:

32" / image height = 4 / 3
32" * 3 = image height * 4 (cross multiply)
(32" * 3 ) / 4 = image height (divide)
image height = 24"

Once you've found your image height, add 8" to figure out your thread length.

Now, cut as many wires as you need at that length.

• tip - find a plank of wood that is half the length of your thread length & wrap your spool around it a bunch of times. This way you can wrap a bunch of times and cut only once!

Then, pull one end of every thread through a hex nut, and bolt it in place.