The Hub

Doug Proper designed a sanding jig that supports variable concave and convex curves, described in the following Loothgroup article: https://loothgroup.com/post-imgcap/the-variable-radius-sander/ I built one and am impressed with how it facilitates preparing bridges, braces and also allows tracing any radius using the chord formula. I made a rough measured drawing and assembly guide to share, with Doug's blessing. First step, ma…

Dear looth community/colleagues around the world, During 2023/24 I have developed a digital gauge to measure so-called longitudinal twist of (bass) guitar necks: the LTwist® gauge. Just to be clear, this is about the "cork screw" type of deviation along the length of a neck, not the bow of a neck. I think there is no need to explain how a too severe neck twist can make it difficult or even impossible to set up a stringed instrument (guita…

I've seen the Elevate Luthierie jig, and it seems simple enough. One thing I don't like about their explanation video is the handwaving around "set the joint length where you want it"...feels like even with the jig, you have to do too much measuring to make it fit exactly (or within the tolerance you want) Given I can model well enough in Fusion and have a 3D printer, feels like a challenge to take on! As far as I can see, the jig is just…

I'm fairly new to CNC and am attempting to set up for a fretboard carve. I'm using a one year old ShopBot Desktop Max. This is the first I've found a problem like this. I made some practice blanks and thought I had everything the way I wanted it until I measured me fret distances. Using calipers from the nut to the center for the first fret slot I get 1.399" and I'm expecting 1.4346. I brought up the file and used the measuring too…

I just opened a repair shop and the first repair was to remove a broken 1/8" hex wrench ball end from the truss rod nut of a Turner RB4 Renaissance Bass. I read of all sorts of theories on how to extract/remove. None of them had recorded actual attempts of the theories. There's probably others on here but I haven't found them. The ball end was loose and mangled at the rear of the nut sleeve. I tried fairly benign methods first. Heat…

For folks familiar with the Gore / Gilet books and the top thickness calculations in section 4.5. I made a web based calculator to do the nasty spreadsheet math... So this is for once you've weighed and measured your top plates and then found the long, cross and transverse resonances it gives you the target thickness to hit a particular frequency for the long resonance of the plate. Just sharing so folks don't have to do the math for bu…

Not sure if this is the best place for this, but whatever. I need somebody to check my logic here--I could be completely wrong in my thinking. I'm about to start up my new shop in Ireland, and the humidity/temperature situation is VERY different than the Greater Washington DC region. I will also be unlikely to have as complete control over temperature and humidity as I did in our extremely tight, air-conditioned house in the US. I also k…