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11-23-2008, 06:10 AM
|  | Supporting Member
Luthier: Bresque Basses, rep: Paulin EUB | | Join Date: Aug 2002 Location: Sydney, Australia | | | Fun in the workshop
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11-23-2008, 08:43 AM
| | Registered User | | Join Date: Feb 2004 Location: Upstate, SC | | | Nice work... what praytell might you be doing in the bass?
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Brian Gencarelli
Double Bassist
Instructor/Performer |
11-23-2008, 09:02 AM
| | AES Fine Instruments | | Join Date: Feb 2002 Location: Brewster, NY, USA | | That's some chunk left on the tailblock!  |
11-23-2008, 10:21 AM
| | Registered User | | Join Date: Oct 2005 Location: Germany | | ok, what about this: http://au.youtube.com/watch?v=r5oJk3Q-lr8
is this a common repair technic?
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‘To get ze good tone you must grip bass hard’. (S.Koussevitzky)
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11-23-2008, 01:13 PM
|  | 'Woodworker - Witch Doctor - Luthier'
Owner/The Bass Spa, String Repairman/L & M Vancouver | | Join Date: May 2006 Location: Crescent Beach, BC | | Geez Matthew, now you've wrecked it!  |
11-23-2008, 01:44 PM
| | Supporting Member
Luthier: Bresque Basses, rep: Paulin EUB | | Join Date: Aug 2002 Location: Sydney, Australia | | Quote:
Originally Posted by arnoldschnitzer  That's some chunk left on the tailblock! | yeeearrr it is isn't it? I was going OK until I got there. Well it's a nice clean chunk, will glue OK, and there's plenty of wood left on the plate ...
What am I doing to it? Well, the bass is just too bright, so I'm regraduating the top.
And this tells me something:  |
11-23-2008, 04:14 PM
| | Registered User | | Join Date: Aug 2007 Location: emmitsburg, maryland | | ran it backwards so it had a happy ending +1 on the aklop music
Last edited by forester : 11-23-2008 at 06:23 PM.
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11-23-2008, 05:43 PM
| | Registered User | | Join Date: Dec 2007 Location: Winnipeg | | | were you in a hurry?
Were you in a hurry because of the camera running? Or maybe that restless music?? |
11-23-2008, 07:29 PM
| | Registered User | | Join Date: Feb 2004 Location: Upstate, SC | | Quote:
Originally Posted by arnoldschnitzer That's some chunk left on the tailblock! | Wow. I didn't see that earlier... 
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Brian Gencarelli
Double Bassist
Instructor/Performer |
11-23-2008, 07:50 PM
| | 'Woodworker - Witch Doctor - Luthier'
Owner/The Bass Spa, String Repairman/L & M Vancouver | | Join Date: May 2006 Location: Crescent Beach, BC | | When I was looking at the video my wife said 'That sounds like your working music!'
I listen to the local French FM station 'Radio L'Espace' and they play a lot of of French/African jazz. Nylon guitar, accordion, double bass and percussion, all with killer groove - now you're working......  |
11-23-2008, 08:08 PM
|  | Registered User
Maker of HPF-Pre upright bass preamp | | Join Date: Mar 2004 Location: Madison WI | | Quote:
Originally Posted by Matthew Tucker yeeearrr it is isn't it? I was going OK until I got there. Well it's a nice clean chunk, will glue OK, and there's plenty of wood left on the plate ...
What am I doing to it? Well, the bass is just too bright, so I'm regraduating the top.
And this tells me something: | I am curious, what am I looking at here? It almost looks like a sand pattern from testing for the vibrational anti-nodes. |
11-23-2008, 08:38 PM
| | Registered User | | Join Date: Nov 2007 Location: NorCal | | Quote:
Originally Posted by Matthew Tucker |
Excuse my ignorance, but is that the "right" way to remove a double bass top??
I would like to know how to do it some day, and I have heard of using moist heat, white vinegar, etc to help loosen the seams first.
That just looks a little rough. |
11-23-2008, 09:12 PM
| | Supporting Member
Luthier: Bresque Basses, rep: Paulin EUB | | Join Date: Aug 2002 Location: Sydney, Australia | | Quote:
Originally Posted by fdeck I am curious, what am I looking at here? It almost looks like a sand pattern from testing for the vibrational anti-nodes. | yes almost. Except it's tea leaves. What does the pattern tell you about the lower bout?
I'm not sure whether there's a "right" way to remove a top. I wasn't rushing; in my other life I was a film editor, so i know how to compress time. I only filmed certain bits, and edited them together so it looks like one quick jobbie. The different music tracks will give you an indication of the amount of time I spent on it. And I knew this one was glued on thinly, so knives and wedges were adequate can-openers. It sounds rough, yes, but I was only using gentle finger pressure on the knives. Hide glue makes a frighteningly loud crack when it pops!
Perhaps I could have spend some more time on the lower block with a hot palette knife, but I didn't, and the chunk is clean and (I hope) will easily glue back!
Last edited by Matthew Tucker : 11-23-2008 at 09:18 PM.
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11-23-2008, 09:21 PM
| | 'Woodworker - Witch Doctor - Luthier'
Owner/The Bass Spa, String Repairman/L & M Vancouver | | Join Date: May 2006 Location: Crescent Beach, BC | | Matthew knows what he's doing - that chunk will glue back in there just fine.
Watch Rene Morel pop the top off a beautiful 1853 Vuillaume cello exactly how Matthew did it, here: http://ca.youtube.com/watch?v=zDGphZaQoSw&fmt=18
Last edited by Jake deVilliers : 11-23-2008 at 09:27 PM.
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11-23-2008, 09:54 PM
| | Registered User
Maker of HPF-Pre upright bass preamp | | Join Date: Mar 2004 Location: Madison WI | | Quote:
Originally Posted by Matthew Tucker yes almost. Except it's tea leaves. What does the pattern tell you about the lower bout? | That is an interesting quiz question. I can only speculate. It seems that the upper portion of the plate is divided into one wide area, and the lower bouts into two independent areas. Their relatively small area suggests to me that they are not doing much sonically.
So, do you want that lower pattern to look more like a horizontal line than a vee?
What's the next step? How do you come up with a strategy for correcting something like that? |
11-23-2008, 11:02 PM
| | Registered User | | Join Date: Apr 2004 Location: Traverse City, Michigan | | | I know but I am not telling ...yet...and so does Matthew.
Matthew did get some fft's on that one before and after and a weight for the record?
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Ken McKay - Michigan - USA
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11-23-2008, 11:10 PM
| | Supporting Member
Luthier: Bresque Basses, rep: Paulin EUB | | Join Date: Aug 2002 Location: Sydney, Australia | | Yes I got a weight but no FFT plot. That's YOUR thing! I find it less telling than the Chladni patterns.
The Strategy comes from a whole lot of things; the weight, the stiffness, the bass bar, the shape, the arching, the current graduation pattern, the chladni patterns, the frequencies of the first five modes, the coriolis effect ... and whether to use darjeeling or lapsang souchong.
Some luthiers consult the warts on a FU QUA and take their lead from that.
But I'm leaning towards lapsang souchong for now ... 
Last edited by Matthew Tucker : 11-23-2008 at 11:14 PM.
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11-23-2008, 11:25 PM
| | Registered User | | Join Date: Apr 2004 Location: Traverse City, Michigan | | Quote:
Originally Posted by Matthew Tucker Yes I got a weight but no FFT plot. That's YOUR thing! I find it less telling than the Chladni patterns.
The Strategy comes from a whole lot of things; the weight, the stiffness, the bass bar, the shape, the arching, the current graduation pattern, the chladni patterns, the frequencies of the first five modes, the coriolis effect ... and whether to use darjeeling or lapsang souchong.
Some luthiers consult the warts on a FU QUA and take their lead from that.
But I'm leaning towards lapsang souchong for now ... |
...you are giving it all away, what if the Chinese get this information.
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Ken McKay - Michigan - USA
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11-23-2008, 11:31 PM
| | Registered User
Maker of HPF-Pre upright bass preamp | | Join Date: Mar 2004 Location: Madison WI | | Quote:
Originally Posted by Ken McKay ...you are giving it all away, what if the Chinese get this information. | It won't help. China is in the northern hemisphere, so the Coriolis effect is of the opposite polarity. |
11-23-2008, 11:45 PM
| | Registered User | | Join Date: Apr 2004 Location: Traverse City, Michigan | | | ...and who has the most tea? Huh?
Keep us posted on your progress. Looks like a worthy project.
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Ken McKay - Michigan - USA
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