In my last post I mentioned some guitar tech work I have planned. Here's a glimpse into what exactly I'll be doing.

My acoustic bass guitar, focused on the rough draft of the new nut I'm carving.
I've been using the Dremel rotary tool I got for christmas to grind a replacement nut for my acoustic bass guitar. The canonical way to grind a nut is to sand it into shape and then file the notches using special "nut files" that come in specific gauges to match the gauge of the strings intended to be used.

The Dremel rotary tool I got for Christmas. It does everything.

The old broken nut for my ABG.
The old nut was made of a cheap plastic and broke after I dropped the guitar once. The new one is made of a higher quality plastic designed to mimic the sonic qualities of ivory called TUSQ. Anyway, I'm trying my hand at using the Dremel for both steps. I used a cutting wheel to set the width, then 120 grit sanding bands to form the shape and get the depth just right. Then I used a 180 grit abrasive buff to make it smooth as a baby's butt!

It's much more obvious how rough mine is when they're side by side. Look how much more like real bone the TUSQ looks though.
For cutting the notches all I had was a 3/32" spherical engraving cutter and a 1/32" cylindrical cutter. This is a bit of a problem because only the spherical ones can round out the bottom of the notch into the shape of a guitar string, yet 3/32" isn't small enough, even for bass strings.

Engraving cutters are small. The one on the left is 1/32".
I couldn't find the smaller spherical cutters alone so I had to buy a kit with a whole bunch of them. Some of the extra pieces are diamond tipped--there's got to be something awesome I can end up using them for.
Anyway, I've only done the work with the larger cutter so far, and I haven't set the precise depth of each slot (the "nut action") yet. I need to set the neck curvature properly before setting the nut and bridge actions. I got a set of automotive feeler gauges to check the required measurements for these. It astounds me that a measurement tool capable of 0.01" precision can be found on ebay for five bucks!

Feeler gauges, usually used for measuring spark plug spark gaps.
Once I finish the ABG's nut, I'm going to make a new one for my dobro. That's the guitar I really care about. It has a nut I made about two years ago from the high quality cow bone that bluegrass players require. I didn't have ANY proper tools. I used nothing but sandpaper and then slotted it using a $5 hobby saw. It's about 1/8" too skinny to fit snugly into the neck anyway. So yeah I got a new blank slab of graphite-impregnated self-lubricating TUSQ for it.

The least interesting picture in this post.
I also got bridge saddles for my Stratocaster made of the same material. Fortunately those require no tooling but I still need to make the measurements to set the action and intonation.

The old bridge saddles. Metal strings sliding along metal bridge pieces? Sounds like a disaster waiting to happen.

That's more like it! Self-lubricating artificial ivory to the rescue!
So yeah anyway that's what I do in my spare time. More to come.