Search found 990 matches

by Alan Carruth
Fri Aug 14, 2020 9:15 pm
Forum: Tools and Jigs
Topic: Ideas Wanted for Cross-Notching Aluminum Rod
Replies: 11
Views: 178

Re: Ideas Wanted for Cross-Notching Aluminum Rod

Here's a shot of the tailpiece on the 'Winter' archtop. You can see the top of the ball on it's post, and catch a glimpse of the ebony inlay reinforcing the hole in the top. The tailpiece is Macassar ebony, as is all the dark wood on this one. The black outside of the pearl purfling on the tailpiece...
by Alan Carruth
Thu Aug 13, 2020 9:06 pm
Forum: Tools and Jigs
Topic: Ideas Wanted for Cross-Notching Aluminum Rod
Replies: 11
Views: 178

Re: Ideas Wanted for Cross-Notching Aluminum Rod

I may have to take a couple of new ones: the old ones are buried deep.
by Alan Carruth
Thu Aug 13, 2020 11:34 am
Forum: Tools and Jigs
Topic: Ideas Wanted for Cross-Notching Aluminum Rod
Replies: 11
Views: 178

Re: Ideas Wanted for Cross-Notching Aluminum Rod

I did something like that on my 'Autumn' archtop. I used a 1/2" ebony post, with a piece of brass tube epoxied onto it, and that ran in a piece of stainless tube set into the tail block. The over sized top end of the ebony rod is shaped as a ball. It goes through a hole in the tailpiece which is for...
by Alan Carruth
Mon Aug 10, 2020 1:15 pm
Forum: Wood and Materials Q&A
Topic: Maple log
Replies: 12
Views: 341

Re: Maple log

The discoloration from the spalting is obvious in the end grain shot. Maple is only a little more resistant to this than birch, of which Frost said: "Two good storms and a rainy day will rot the best birch fence a man can build". Spalting is caused by fungus, of which there are a number of sorts. On...
by Alan Carruth
Fri Aug 07, 2020 3:39 pm
Forum: Tools and Jigs
Topic: Ideas Wanted for Cross-Notching Aluminum Rod
Replies: 11
Views: 178

Re: Ideas Wanted for Cross-Notching Aluminum Rod

How accurate do you need this to be? How many do you need to make? Start by drilling a 1/4" hole across the grain of a piece of something hard, like maple, of an appropriate size. Then drill a 3/4" hole along the grain that intersects the 1/4" hole in the right place. Cut down to the top of the 1/4"...
by Alan Carruth
Tue Aug 04, 2020 12:06 pm
Forum: Wood and Materials Q&A
Topic: Maple log
Replies: 12
Views: 341

Re: Maple log

I know some folks who would love that wood; it's highly figured and spalted. It would make some nice turnings, or jewel boxes, and, of course, any number of sound hole rings. I would not even try to make a guitar out of it. It's really too bad that it was not processed right away when it was cut. Th...
by Alan Carruth
Sun Jul 26, 2020 11:41 am
Forum: Archtop Guitars and Bass Guitars
Topic: Archtop side thickness
Replies: 2
Views: 202

Re: Archtop side thickness

I've used 2 mm on mine, and thinner in the cutaway areas.
by Alan Carruth
Thu Jul 23, 2020 1:21 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Maple plate carving
Replies: 14
Views: 1183

Re: Maple plate carving

I make the high point of the arch at the bridge location on the top. As I may have mentioned I only make a pattern for the top, since, in the way I do it, the back is lower. I'm using the 'curtate cycloid' method of laying out the cross arches. Once you have determined the lengthwise arch along the ...
by Alan Carruth
Tue Jul 14, 2020 8:38 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Maple plate carving
Replies: 14
Views: 1183

Re: Maple plate carving

The lip is there to support the router when I make the rabbet for the purfling and binding. It's easy enough to carve it down to fair into the recurve once the binding is on, and I don't think it adds so much stiffness around the edge that it messes up the plate tuning noticeably.
by Alan Carruth
Tue Jul 14, 2020 1:19 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Maple plate carving
Replies: 14
Views: 1183

Re: Maple plate carving

I have a few photos of that stage on the most recent archtop: I hope these are not too big. Here is the layout for the pattern I use to transfer the contour lines to the plates. Since I generally make the back arch lower than the top I only make a 'top' pattern. The manila pattern on the top is one ...
by Alan Carruth
Sat Jul 11, 2020 12:15 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Maple plate carving
Replies: 14
Views: 1183

Re: Maple plate carving

Making the contour maps is mostly a drafting problem. You start with the outline, and lay out the lengthwise and crosswise arches on it. Start from the low point of the arch as being at some reasonable level above the bottom of the plate. Measure up from the base line of each arch to where the heigh...
by Alan Carruth
Fri Jul 10, 2020 12:31 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Maple plate carving
Replies: 14
Views: 1183

Re: Maple plate carving

I've been using a Wagner Safety Planer in the drill press for the outside of the plates. I use the lengthwise and crosswise arch templates (or make up your own) to develop a set of contour maps at 2 mm intervals. These are marked out on the wood, starting from the top, and the DPP used to hog off ma...
by Alan Carruth
Fri Jul 03, 2020 12:15 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: falcate bracing
Replies: 19
Views: 823

Re: falcate bracing

Barry Daniels wrote: "I have been here for over 20 years and have been trying really hard to be helpful all this time (especially to newbies). I feel like I have paid my dues, so to speak." I've been here about as long. Back when, iirc, you were not even allowed to mention a commercial web site, eve...
by Alan Carruth
Fri Jul 03, 2020 12:04 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Pecan for acoustic guitar
Replies: 7
Views: 400

Re: Pecan for acoustic guitar

Brazilian rosewood is pretty unstable, too, but that doesn't stop us.
by Alan Carruth
Tue Jun 30, 2020 12:44 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: falcate bracing
Replies: 19
Views: 823

Re: falcate bracing

"I bet ol' Antonio was a real grumpus."

Assuming you mean Tony Strad; by all accounts he was a workaholic who never took his shop apron off.
by Alan Carruth
Sat Jun 27, 2020 2:08 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: falcate bracing
Replies: 19
Views: 823

Re: falcate bracing

Well,now we know where your 'main air' and 'main top' resonances are....

The 'falcate' bracing should give larger vibrating areas for the lower 'signature' resonances, much like an archtop. I've only seen a few of these, and never made one myself, but it's interesting.
by Alan Carruth
Tue Jun 23, 2020 9:19 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Practice Wood - Archtop Tops and Backs
Replies: 4
Views: 595

Re: Practice Wood - Archtop Tops and Backs

If there's a hardwood place nearby you might be able to get a wide board of poplar or birch for a back. If you have a bandsaw you can re-saw a 6/4 board 8" or 10" wide and get a book match. These, and especially the poplar, would be fairly easy to carve, and can actually make a nice instrument if th...
by Alan Carruth
Mon Jun 22, 2020 1:41 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Bridges - Materials and energy losses
Replies: 6
Views: 731

Re: Bridges - Materials and energy losses

"... to enhance the long dipole movements." The problem is that bridge rocking of that sort is, at best, unimportant on an arch top. There are two string 'signals' that can drive the top through that sort of bridge rocking. The main one is a product of the twice-per-cycle tension change of the strin...
by Alan Carruth
Sun Jun 21, 2020 12:13 pm
Forum: Glues and Finishes
Topic: waxed vs de-waxed shellac for FP?
Replies: 2
Views: 483

Re: waxed vs de-waxed shellac for FP?

Some folks say that the wax tends to make the pad stick more. With some of the less refined types of shellac, particularly seedlac, the wax particles seem to be larger and easier to filter out. I find with the 'teabag method' particularly useful there. you tie up the shellac that you are going to di...
by Alan Carruth
Sun Jun 21, 2020 12:11 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Bridges - Materials and energy losses
Replies: 6
Views: 731

Re: Bridges - Materials and energy losses

Brian Evans wrote: " I find that the lighter the bridge, the better it seems to transfer energy. " I would say that the lighter the bridge the less it loads the top, so it's easier for the top to move. Added mass on the top cuts down on the output more in the treble than the bass, and that might ten...