Search found 1092 matches
- Sun Sep 23, 2012 1:15 pm
- Forum: Instrument Builders Forum
- Topic: Brushing epoxy
- Replies: 11
- Views: 9961
Brushing epoxy
Hey, I have usually used a old credit card to spread epoxy and then sand it back to wood. But I end up with some sinking of the finish into grain lines after about 6 months. So reading the Gore/Gilet book Trevor suggests brushing the epoxy and leveling it so I thought I'd give this a try. My first o...
- Sun Sep 23, 2012 1:06 pm
- Forum: Instrument Builders Forum
- Topic: Help with Plane Selection
- Replies: 5
- Views: 5701
Re: Help with Plane Selection
http://www.leevalley.com/US/wood/page.a ... 1182,52515
I recently got one of these and its lovely. I see they are now selling with the new super duper blade. I think it is still cheaper to get them from LeeValley than CT.
Dom
I recently got one of these and its lovely. I see they are now selling with the new super duper blade. I think it is still cheaper to get them from LeeValley than CT.
Dom
- Sun Sep 23, 2012 10:02 am
- Forum: Instrument Builders Forum
- Topic: Australia Handmade Guitar - Trying to locate the Maker!!!
- Replies: 6
- Views: 6714
Re: Australia Handmade Guitar - Trying to locate the Maker!!
Or a Scottish thistleJ.F. Custom wrote:
As a side, I see the headstock inlay as a Ginko Branch... Clue perhaps??
Jeremy.
- Sat Sep 22, 2012 2:44 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 4 DOF Model
- Replies: 109
- Views: 196483
Re: 4 DOF Model
Hi Trevor, I suspect it is something to do with the rules and how we apply them to Dbar. I am still trying different things. I've got your 100Hz numbers to work at.
Thanks for your help so far. I'll crack this eventually.
Cheers
Dom
Thanks for your help so far. I'll crack this eventually.
Cheers
Dom
- Fri Sep 21, 2012 8:09 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 4 DOF Model
- Replies: 109
- Views: 196483
Re: 4 DOF Model
Well I have spent days and nights on this and it does not seem to matter which way we calculate Dbar it comes out the same and Os and I are getting the same results. I built the calculations from scratch using the equations in the book as a guide. So we have arrived at this outcome independently. Bu...
- Fri Sep 21, 2012 11:49 am
- Forum: Jigs & Fixtures
- Topic: Correcting/stopping Neck warp?
- Replies: 4
- Views: 8311
- Tue Sep 18, 2012 10:12 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: What would you call these modes
- Replies: 12
- Views: 13364
Re: What would you call these modes
Nice set up to get such clean lines at those high frequencies Marty. I wonder if there is a frequency that would outline all the braces?. You got a ubeaut analogue one from that guy didn't you? My sig gen works great but I only have a shitty little component amp and need something cleaner and more p...
- Tue Sep 18, 2012 9:46 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 4 DOF Model
- Replies: 109
- Views: 196483
Re: 4 DOF Model
Don't worry Os, I'll track down the problem. I think of it this way, once I have got equations working for all the models in the book there are none left to do and its a real buzz getting it to work. I've finished to intonation spreadsheet and just need to load a set of strings and run it. So this m...
- Tue Sep 18, 2012 1:26 pm
- Forum: Instrument Builders Forum
- Topic: Another Newbie - Newcastle
- Replies: 25
- Views: 22319
Re: Another Newbie - Newcastle
Yeah, I found the Kinkead book really useful for my first guitar. He steers a nice line through the subject and does not digress too much so you get just what you need and nothing else. The only thing you would do differently is use radius dishes for the top and back. But he steps through the proces...
- Mon Sep 17, 2012 8:00 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 4 DOF Model
- Replies: 109
- Views: 196483
Re: 4 DOF Model
Hey Os, I'm about half way through recalculating everything. I've written out the equations in mathtype directly from the book then create new formulas based on those specifications for each variable then checking against your workbook. Once I have equations for one frequency I'm happy with I'll cop...
- Mon Sep 17, 2012 7:40 am
- Forum: Instrument Builders Forum
- Topic: Exporting a guitar, safest option.
- Replies: 22
- Views: 16881
Re: Exporting a guitar, safest option.
I've travelled twice OS with a guitar in baggage not in overhead. Hard shell case made of fibre glass not abs. Once to Washington in the US and once to Warsaw in Poland So 2 pretty long flights with serveral domestic changes to link up with other planes. Its the domestic legs I had trouble with but ...
- Mon Sep 17, 2012 7:01 am
- Forum: Instrument Builders Forum
- Topic: Acoustic bass specs
- Replies: 16
- Views: 15034
Re: Acoustic bass specs
So while everyone seems to agree that a large air cavity is good for a bass, can anyone explain why? What are the attributes of a large air cavity that helps support the lower notes and that can not be gained by reducing the relative sound hole radius. Using the Gore framework I can't see how this c...
- Sun Sep 16, 2012 6:35 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 4 DOF Model
- Replies: 109
- Views: 196483
Re: 4 DOF Model
Cool thanks Trevor. I did read through all your posts again carefully after I had asked the question and I found those two quotes but I am not allowed to edit my own posts ...for it is written. Too many late nights playing with excel and my brain needed a break to gain some perspective. Now I can vi...
- Sun Sep 16, 2012 5:10 pm
- Forum: Instrument Builders Forum
- Topic: Acoustic bass specs
- Replies: 16
- Views: 15034
Re: Acoustic bass specs
Cool thanks Graham. I'd love to see your notes at some stage.
Still a bit cold here in Canberra so I would not be rushing home from Italy just yet.
Cheers
Dom
Still a bit cold here in Canberra so I would not be rushing home from Italy just yet.
Cheers
Dom
- Sun Sep 16, 2012 5:06 pm
- Forum: Instrument Builders Forum
- Topic: Acoustic bass specs
- Replies: 16
- Views: 15034
Re: Acoustic bass specs
Thanks Phil, I am more along for the intellectual stimulation but like everyone, an acoustic bass is on my list somewhere. The article I read about them said basically what you said, most of these basses are not very good. And whoever it was said they were having good results using lighter braced sm...
- Sun Sep 16, 2012 1:11 am
- Forum: Instrument Builders Forum
- Topic: Acoustic bass specs
- Replies: 16
- Views: 15034
Acoustic bass specs
Hey, was talking with craig about an acoustic bass he is planning on building and it got me thinking about the design. conventional 'wisdom' says an acoustic bass should have a large deep body, extra bracing and a thicker top. But more recently I have read that 4 string bass guitars can be built a l...
- Sun Sep 16, 2012 12:00 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 4 DOF Model
- Replies: 109
- Views: 196483
Re: 4 DOF Model
Yes, history has not done us any favours with the nomenclature. Really, the i or j operator (depending on whether you are an electrical engineer or not) should be a sign like "+" or "-", at least for engineering applications. Anybody who teaches that j is the SQRT(-1) has no understanding of the co...
- Sat Sep 15, 2012 9:22 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 4 DOF Model
- Replies: 109
- Views: 196483
Re: 4 DOF Model
Thanks Trevor, along with Os' question of how to turn an imaginary number into something we can use, I just want to clarify the following. When we calculate the Di's for each increment, do we also need to do the same with the Ys or are they in effect, constants associated with the top, back, sides a...
- Sat Sep 15, 2012 3:40 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 4 DOF Model
- Replies: 109
- Views: 196483
Re: 4 DOF Model
There is a permanence about the word doomed that I refuse to concede to so I take it back. I’ll get this worked out one way or another. I was asking about producing columns of real numbers, one for each Da Db Dt Ds at each freq increment. Now I get that this is not what happens. People say economist...
- Sat Sep 15, 2012 3:16 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Test data for intonation spreadsheet
- Replies: 28
- Views: 30763
Re: Test data for intonation spreadsheet
Thanks Trevor, I'm nearly done but a lot of this stuff is new to me, not the math but the terms and how they compare and how this stuff behaves. But I am close
Cheers
Dom.
Cheers
Dom.
- Fri Sep 14, 2012 9:52 pm
- Forum: Instrument Builders Forum
- Topic: Introductions - a polite request
- Replies: 54
- Views: 50127
Re: Introductions - a polite request
Hey you know what, we've got all these new blokes wondering around eating snags and drinking beer and we know who they are but they don't know who we are. Perhaps it would be worth all of us doing a brief who am I and were is my shop. OK, names Dominic, originally from Margaret River in WA where I w...
- Fri Sep 14, 2012 9:30 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 4 DOF Model
- Replies: 109
- Views: 196483
Re: 4 DOF Model
Hi Trevor, I have been chatting with Os about the model this week and I ended up sitting here at 4.00am this morning reading and playing with the spreadsheet. So the sooner I/we get this worked out the soon I will be able to go to bed. Now, previously you mentioned calculating all the Di,s for each ...
- Thu Sep 13, 2012 3:34 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 4 DOF Model
- Replies: 109
- Views: 196483
Re: 4 DOF Model
Hey Os, nice work on getting this far. First one to get the model working that I know of. I have my sights set on getting it up and working but have not read that bit enough yet. But as guide to those of us behind you, could I suggest that when you ask questions, put down the page number or the equa...
- Thu Sep 13, 2012 2:26 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Test data for intonation spreadsheet
- Replies: 28
- Views: 30763
Re: Test data for intonation spreadsheet
Hey Trevor or Martin (munchkin), in calculating the mass per unit length of a string, eq 4.7-34, is the L variable the L derived from eq 4.7-32? Or is it just the length of the rig? Also, what units are all the measurements in? I think I am having issues with putting everything in the right form. I ...
- Wed Sep 12, 2012 6:46 pm
- Forum: Instrument Builders Forum
- Topic: KiwiGeo's Polite Request
- Replies: 3
- Views: 3631
Re: KiwiGeo's Polite Request
Hey Os, welcome, you will find lots of answers here and lots of help. The design and build thread is a beauty. A lot of the easier stuff has been worked out and solutions and tips posted. So have a go at the thickness equation and see how you go. A lot of the questions you may have have probably alr...