Reasonably Intelligent Maker

While replacing our cabinets in the kitchen when it got around to the sink base I had to measure where to place the holes for the water source lines, the drain and the electrical box. I screwed it up, which you can see from the picture, but you can learn from my mistake and get it 100% dead on correct. When cabinets have face frames, most common style in the US, there is an overhand of 1/4". You can certainly measure this and verify it exactly. But for sake of argument let's say it is exactly 1/4". When you are measuring using one cabinet as the offset to the item you double this amount (once for the cabinet you are measuring from and once for the cabinet you are measuring into. So now we have 1/2". So far this is pretty simple math. So measure from the back of the installed cabinet to the landmark (water pipe) and let's say that is 22-1/4". Here is where I made my mistake. Now subtract (do not ADD like I did) 1/2" from 22-1/4" giving you 21-3/4...

There are many ways to come up with fret spacing. They are all based on a fairly simple calculation. Here is a Google Sheet that will let you calculate it for pretty much any scale length. One of the nice things it does is gives you output in several formats. Closest 1/32" is a good one if you like to use a ruler rather than a micrometer. Although, thousandths of an inch are also available. https://docs.google.com/spreadsheets/d/1f3wNxmkvERDJkktXgPtjiiyyWfVPx9pZYnW6BsMG4f4/edit#gid=0

For those of you wanting the real technical information about how big to make a sound hole, here is a calculator that will let you know the optimal size. https://docs.google.com/spreadsheets/d/162dlTywVmJ3mb6_i5vADdE7M3axWsBavn-7VYklB5z4/edit#gid=0