Search found 1397 matches

by Trevor Gore
Mon Jan 14, 2019 9:34 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: My first frequency spectrum
Replies: 9
Views: 216

Re: My first frequency spectrum

Your density and elastic moduli are OK; your thickness calc is wrong. Should be 0.02857 not 0.2857 as the first constant in the denominator. There may be other errors, but that's the one I can see. Correct answer is 2.71mm (on my workings!) so you will know when you're right. Also use the data in Ta...
by Trevor Gore
Sun Jan 13, 2019 10:41 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: My first frequency spectrum
Replies: 9
Views: 216

Re: My first frequency spectrum

Looks about right, but I don't know the dimensions of the wood.

Regarding the mic etc. issues, what sound card and software are you using?
by Trevor Gore
Sat Jan 12, 2019 11:06 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Bolt on bolt off neck - order of operations
Replies: 36
Views: 3460

Re: Bolt on bolt off neck - order of operations

I can't for the life of me find a reference to the depth of this router cut... Section 20.3.2, penultimate paragraph. So the bridge is currently 10 mm thick and the slot is 8 mm deep. Is that sufficient meat in the bottom? I wouldn't be worrying about it. The other thing is, the low E string is, du...
by Trevor Gore
Sat Jan 12, 2019 10:46 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Steel String Chladni Patterns
Replies: 1
Views: 58

Re: Steel String Chladni Patterns

I can't say I've noticed much difference, though there probably is one. Twice the power would only be another 3dB. I'll have the gear out next w/e, so I'll see if I find any difference.
by Trevor Gore
Sun Jan 06, 2019 10:37 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Bolt on bolt off neck - order of operations
Replies: 36
Views: 3460

Re: Bolt on bolt off neck - order of operations

The simple option is to do nothing. Once strung up the nut will sit there quite happily. A single drop of superglue could be used to prevent it dropping out whilst stringing. If you want to retain a channel, the challenge is keeping the bottom of the slot flat. Whatever you do, don't remove all the ...
by Trevor Gore
Wed Jan 02, 2019 9:58 am
Forum: Instrument Builders Forum
Topic: Some mandolin thoughts
Replies: 3
Views: 392

Re: Some mandolin thoughts

Nice work, Peter. It seems that the principles in the book can be applied across a whole range of stringed instruments comprising a ported box and strings - which isn't surprising, really. All that changes is the scale (as in size).
by Trevor Gore
Sun Dec 23, 2018 9:29 am
Forum: Instrument Builders Forum
Topic: Compensated nut WIP
Replies: 19
Views: 1048

Re: Compensated nut WIP

I run a clearance over the 2nd fret of .006" on the 6th string and .004" on the Ist, with the 3rd fret capo'd, and still get those sharp notes on some open chords. Should I take the clearances even lower before going further with the making of this compensated nut ? I try to run the fret surfaces a...
by Trevor Gore
Sat Dec 22, 2018 4:48 pm
Forum: Instrument Builders Forum
Topic: Compensated nut WIP
Replies: 19
Views: 1048

Re: Compensated nut WIP

Is that reference from one of your books ? Which one ? Yes, the Design book as Col mentioned. Apologies, I jumped to the assumption that as you were messing with nut compensation you would already have them. There's a 25 page chapter on compensation and intonation (Section 4.7, Design) with a few d...
by Trevor Gore
Fri Dec 21, 2018 10:22 am
Forum: Instrument Builders Forum
Topic: Compensated nut WIP
Replies: 19
Views: 1048

Re: Compensated nut WIP

donnyb wrote:
Thu Dec 20, 2018 9:25 pm
First up...re the scale length, where does the number 1.0595 fit with quote "12th root of two and some are real rule of 18" ?
See Section 4.6.6, Design.
by Trevor Gore
Thu Dec 20, 2018 9:26 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: uery for Trevor re Compensation Calculations
Replies: 44
Views: 16509

Re: uery for Trevor re Compensation Calculations

Btw. how would you determine the nut and saddle compensation on an already finished guitar? For input we have now the intonation errors which most probable don´t correspond to the theoretical errors. So how do you start... Add just the measured intonation errors to the theoretical values? Somehow I...
by Trevor Gore
Wed Dec 19, 2018 8:05 pm
Forum: Instrument Builders Forum
Topic: Modal Tuning Course in Melbourne, Jan 2019
Replies: 4
Views: 1110

Re: Modal Tuning Course in Melbourne, Jan 2019

Just had a late cancellation, so one more place is available again. First come, first served!

Cheers, Trevor.
by Trevor Gore
Wed Dec 19, 2018 8:02 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Not enough bridge rotation
Replies: 1
Views: 205

Re: Not enough bridge rotation

I finally got around to testing the degree of bridge rotation and it's only .7 degrees, tested with an iPhone clinometer and some adhesive putty. The measurement technique does influence the answer you get. The book techniques notes the use of a neck rest, basically to make sure the guitar remains ...
by Trevor Gore
Wed Dec 19, 2018 7:36 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Bolt on bolt off neck - order of operations
Replies: 36
Views: 3460

Re: Bolt on bolt off neck - order of operations

I still can't say I completely understand the way the geometry is arrived at as the angle of the heel block must change as it is shaped and contoured due to the undercut, as you mention, so the initial adjustment of the heel block will be undone after carving. That's something for me to ponder and ...
by Trevor Gore
Wed Dec 19, 2018 7:18 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: uery for Trevor re Compensation Calculations
Replies: 44
Views: 16509

Re: uery for Trevor re Compensation Calculations

Question 2 concerns the neck modelling: Ok, I can model the action at each fret according to equation 4.7-22. But how relieable are these models? Are you modelling the neck curve for every new guitar again? Or do you just change the values for relief, nut height and action at fret 12 (or fret 18) a...
by Trevor Gore
Wed Dec 19, 2018 7:01 pm
Forum: Instrument Builders Forum
Topic: Warning to be conscious!!!!
Replies: 5
Views: 523

Re: Warning to be conscious!!!!

Cheap insurance:

Image

$8.95, Bunnies.
by Trevor Gore
Wed Dec 19, 2018 6:50 pm
Forum: Instrument Builders Forum
Topic: Increasing Acoustic Guitar Body Depth
Replies: 5
Views: 463

Re: Increasing Acoustic Guitar Body Depth

Hi All I am interested in knowing whether increasing the standard guitar body depth of an acoustic guitar be it for example an 'OM' or 'GS' size model in the range of 2mm to 4mm would have benefits. Keeping in mind that adjustments may be necessary to the size of the sound hole to suit the change i...
by Trevor Gore
Wed Dec 19, 2018 5:41 pm
Forum: Instrument Builders Forum
Topic: Compensated nut WIP
Replies: 19
Views: 1048

Re: Compensated nut WIP

Sorry it's taken me a while to get to this. My first thought when I read this a while back was that you need to figure out what scale length you are working with. Gibson/Epiphone are notorious for using weird scale lengths and fretboard divisions; some are 12th root of two and some are real rule of ...
by Trevor Gore
Wed Dec 12, 2018 8:00 pm
Forum: Instrument Builders Forum
Topic: Modal Tuning Course in Melbourne, Jan 2019
Replies: 4
Views: 1110

Re: Modal Tuning Course in Melbourne, Jan 2019: fully subscribed

The Melbourne course is now fully subscribed. Thank you to all for the interest shown.

Have a great Christmas and New Year,

Trevor.
by Trevor Gore
Mon Dec 10, 2018 10:57 pm
Forum: Instrument Builders Forum
Topic: Modal Tuning Course in Melbourne, Jan 2019
Replies: 4
Views: 1110

Re: Modal Tuning Course in Melbourne, Jan 2019

As I write, there have been nearly 500 views of the message above, so plenty of interest and as of now, there is just one place left on the January course. So if you were hesitating, now is the time to jump! There is no perfect time for everyone and I know many people have family commitments in Janu...
by Trevor Gore
Sun Dec 09, 2018 11:44 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Bolt on bolt off neck - order of operations
Replies: 36
Views: 3460

Re: Bolt on bolt off neck - order of operations

Hi Trevor Thanks for the reply. Yes, I misinterpreted the paragraph about yaw and pitch adjustment. I fixed the yaw only. I guess the plan indicates that the neck is completely square and it shows the position of the mortise relative tho the square tenon The plan is a single generic drawing coverin...
by Trevor Gore
Sun Dec 09, 2018 4:18 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Bolt on bolt off neck - order of operations
Replies: 36
Views: 3460

Re: Bolt on bolt off neck - order of operations

Before any holes are drilled, the neck pitch angle has to be correct (and also the yaw and roll). From what I can make out from the pics (the wide angle distorts things a lot) you didn't have the neck fully fitted before you started drilling holes (both the mortise and the bolt holes). It seems tha...
by Trevor Gore
Mon Dec 03, 2018 7:35 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Predicted Panel Thickness
Replies: 7
Views: 2443

Re: Predicted Panel Thickness

RonRapp wrote:
Fri Nov 30, 2018 10:45 am
BTW, I am very happy with the final sound!
Ah, there's the answer to my question in another thread!

Excellent!
by Trevor Gore
Mon Dec 03, 2018 7:32 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Starting out on J45
Replies: 29
Views: 3579

Re: Starting out on J45

That's good to hear. I don't think I've ever come across a piece of stationary manufacturing equipment that would function better for being lighter!
by Trevor Gore
Mon Dec 03, 2018 7:29 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Prototype Gore Guitar Freq Request
Replies: 21
Views: 2803

Re: Prototype Gore Guitar Freq Request

Looks great, Ron!

Do you like how it sounds?

BTW, anything you do to the fretboard will increase the T(1,1) frequency. Whilst not a regular solution, it is OK to leave the fretboard end as it is. It would be far from the first with that treatment.
by Trevor Gore
Mon Dec 03, 2018 4:11 pm
Forum: Instrument Builders Forum
Topic: Modal Tuning Course in Melbourne, Jan 2019
Replies: 4
Views: 1110

Modal Tuning Course in Melbourne, Jan 2019

Attention those who live south of the border: I will be running one of my 3 day Modal Tuning courses in Melbourne early next year. I’ve lost count of how many times I’ve run this course now, but probably close to 20 times, including 6 times in the USA. It has proved to be very popular. Here are a fe...