Search found 394 matches

by Todd Stock
Sun May 07, 2017 11:09 am
Forum: Glues and Finishes
Topic: using West Systems 105/207, problems with application
Replies: 14
Views: 7387

Re: using West Systems 105/207, problems with application

Scrape off until you can sand, then level. Epoxy is much better applied with a commercial/industrial grade squeegee...credit cards and other work-arounds do not push the epoxy into the pores are effectively as a squeeze and fail to remove enough excess to avoid excessive build-up on the surface. Eto...
by Todd Stock
Sun May 07, 2017 10:58 am
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Rosettes for Newbies
Replies: 36
Views: 21713

Re: Rosettes for Newbies

Do the adjustments on a dummy top - 1/2" mdf or the scrap 12mm marine ply I have left from a recent boatbuilding project are both perfect. Make the adjustment and check on the dummy top, then make the cut on the top. Sounds tedious, but takes just a little extra time and allows momentary instances o...
by Todd Stock
Thu May 04, 2017 3:48 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Rosettes for Newbies
Replies: 36
Views: 21713

Re: Rosettes for Newbies

One thing to add was a mod I did on my jig back in 2006 or so - undersized pivot pins or wear can cause some slop, so adding a small delrin or nylon set screw to bear against the pivot pin becomes a set-and-forget adjustment when the same pivot pin stock is used in the shop.
by Todd Stock
Wed May 03, 2017 11:31 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Rosettes for Newbies
Replies: 36
Views: 21713

Re: Rosettes for Newbies

Delrin works well...after a lot of use, still tight and accurate. Scrap is not tough to find if you have a plastics place nearby.
by Todd Stock
Wed May 03, 2017 6:35 am
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Rosettes for Newbies
Replies: 36
Views: 21713

Re: Rosettes for Newbies

The best of the jigs I've found is the Wells/Karol type, which has a range limited only by the length of the guide rods used...I've used mine on furniture projects as well as instruments. Accuracy in setting is excellent, as the adjustment thread is a 1/4-20 (0.050" for turn). Sylvan Wells has the p...
by Todd Stock
Sat Apr 29, 2017 7:34 am
Forum: Glues and Finishes
Topic: Sign of Hot Hide Glue going bad?
Replies: 11
Views: 7942

Re: Sign of Hot Hide Glue going bad?

My hide glue info to students: - Keep dry hide in sealed containers (a new gallon paint can will hold 5 lbs of dry hide), and stored in a cool, dry location - Use distilled water to make up the glue; pH matters, as does other contaminates, so avoid the issue - Good glue crystals should hydrate quick...
by Todd Stock
Thu Apr 27, 2017 6:56 am
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Grellier OM Bracing Pattern
Replies: 18
Views: 11504

Re: Grellier OM Bracing Pattern

I would consider building one scalloped/tapered and one tapered - getting either right is a challenge, and you'll learn more about the differences firsthand than you'll learn in a hundred online discussions. While the traditional 'Golden Era' OM tone is closely associated with scalloped and tapered ...
by Todd Stock
Wed Apr 26, 2017 7:04 am
Forum: Tools and Jigs
Topic: Plane Tuning
Replies: 21
Views: 12408

Re: Plane Tuning

Fine Woodworking and Popular Woodworking magazines have lots of articles on restoring and tuning planes. Also try Woodcentral's hand Tool Forum...a fractious bunch, but good info available. Finally, consider starting with a vintage prewar Stanley, rather than a new, lower-end tool. The cost will lik...
by Todd Stock
Sat Apr 22, 2017 6:06 am
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Looking at these guitar plans
Replies: 23
Views: 16078

Re: Looking at these guitar plans

If you try the OLF SJ, just keep in mind that the guitar as drawn is heavily braced on the top...reduce the brace depth x width to closer to (in inches) .575 x .250 (X), .550 x .250 (TB), .313 x .250 (F), and .625 x .375(UTB) if going with scalloped/tapered. Top area on the SJ is just a few square i...
by Todd Stock
Thu Apr 13, 2017 7:55 am
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Looking at these guitar plans
Replies: 23
Views: 16078

Re: Looking at these guitar plans

There's a lot of stuff that you cannot figure out without building, so you might consider trying to get a couple mid-sized instruments under your belt before worrying too much about selecting the perfect combination of bracing, woods, etc. One the process is ironed out and you understand the order o...
by Todd Stock
Fri Apr 07, 2017 6:46 am
Forum: Glues and Finishes
Topic: General Finishes Waterbase Topcoat - SM is pushing this - anyone tried it?
Replies: 230
Views: 176002

Re: General Finishes Waterbase Topcoat - SM is pushing this - anyone tried it?

Thickness is the issue - keep it under 5 mil and it's going to be a challenge to find any differences...FP is preferred in some communities because it's a couple mil, despite issues with durability, application labor, etc.
by Todd Stock
Thu Mar 30, 2017 6:02 am
Forum: Tools and Jigs
Topic: Holding device for an OM sound box for cleanup
Replies: 14
Views: 7669

Re: Holding device for an OM sound box for cleanup

A guitar trojy...pretty much purpose-designed for the job and standard in our shop for this work. Rod True put together plans for a version of this that used to be hosted elsewhere on the web, but are now in the archives on another builder site (OLF). Because the current MIMF SW does not allow PDF f...
by Todd Stock
Tue Mar 28, 2017 7:59 am
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: attaching bolt on neck- OM
Replies: 9
Views: 5410

Re: attaching bolt on neck- OM

I should mention that the correction above is as a result of body distortion due to string tension, or what some call 'top rise', because the net result is what appears to be a rise in the top and less distance between the top and string line plane, with the result being being an underset neck.
by Todd Stock
Tue Mar 28, 2017 4:50 am
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: attaching bolt on neck- OM
Replies: 9
Views: 5410

Re: attaching bolt on neck- OM

Start from where you want the string height to be and work down: Desired string height over top at saddle (string plane-to-top) distance = .500" String plane to fret-top plane distance at saddle = ~ .165" (scale length and action dependencies) Fret-top plane to fretboard-top plane distance at saddle...
by Todd Stock
Sun Mar 26, 2017 5:04 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: attaching bolt on neck- OM
Replies: 9
Views: 5410

Re: attaching bolt on neck- OM

For a 1/2" string height at the saddle, the projected neck line from bare neck (no fretboard) should show about .085" clearance at the saddle location. The neck should be flush with the top, so if the curvature of the top interferes with use of a straight edge, use a couple offset blocks of equal th...
by Todd Stock
Thu Mar 23, 2017 7:41 am
Forum: Glues and Finishes
Topic: Gluing top/back with Hot Hide Glue
Replies: 12
Views: 6290

Re: Gluing top/back with Hot Hide Glue

We glue up in a go-bar deck using a perimeter caul (1/8" temper board with texture on one side, trimmed to guitar shape and center removed to within 1" of rim. We use a 1" Taklon artist's brush or a linden bast to apply a coat of HHG on the linings, blocks, etc., then a second coat to get a slightly...
by Todd Stock
Thu Mar 09, 2017 7:42 am
Forum: Tools and Jigs
Topic: 8020 source
Replies: 3
Views: 2801

Re: 8020 source

Excellent tip, Steve - there are 20 or so scrap dealers in a 50 mile radius of my shop...scrap 1/4" aluminum plate is another thing that comes in handy!
by Todd Stock
Mon Mar 06, 2017 1:01 am
Forum: Glues and Finishes
Topic: General Finishes Waterbase Topcoat - SM is pushing this - anyone tried it?
Replies: 230
Views: 176002

Re: General Finishes Waterbase Topcoat - SM is pushing this - anyone tried it?

Noticeable settling of first coat, less noticeable on second, and pretty much gone after 3-4 coats.
by Todd Stock
Sun Mar 05, 2017 9:18 am
Forum: Glues and Finishes
Topic: General Finishes Waterbase Topcoat - SM is pushing this - anyone tried it?
Replies: 230
Views: 176002

Re: General Finishes Waterbase Topcoat - SM is pushing this - anyone tried it?

There is a bit of settling over fish, but I have not seen it over hide or Titebond lines, but I've only done Enduro-Var and Pro topcoats in WB. In 12 years using Mohawk, I've seen changes to the formulation such that today's lacquer appears to be more prone to checking and separation with sealers th...
by Todd Stock
Fri Mar 03, 2017 5:51 pm
Forum: String Instrument Repair: Practical and Political Issues
Topic: Hairline Cracks in Macassar Ebony Back
Replies: 25
Views: 20976

Re: Hairline Cracks in Macassar Ebony Back

This is a stability issue with flat sawn wood - it'd going to crack, and you should get used to repairing these cracks. Avoid poorly selected, seasoned wood in the future. I humidify to close up the crack as much as possible, then medium and thin to get a penetrating, crack-filling mix tailored to t...