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PostPosted: Thu Mar 27, 2008 9:35 am 
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Cocobolo
Cocobolo
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Joined: Thu Aug 03, 2006 4:48 pm
Posts: 204
Location: Wayne, NJ, United States
First name: Gary
Last Name: Lee
Status: Professional
This method uses a router and several jigs. Although making the jigs is an investment in time, they make bridge construction extremely fast and accurate.

1) The bottom of the blank is arched to fit the dome of the top using a sanding drum that follows the contour at the bottom of the platform.
Attachment:
Arching bottom of blank to match dome of top--wheel follows arc at bottom of jig.jpg

2) The blank is clamped to a stage in a jig that has a system of rails. A router fixed to a base rides above the stage between the adjustable rails to reduce the thickness of the wings and define the region for the saddle and tie block.
Attachment:
Routing wings.jpg

3) The position of the stage holding the blank is adjustable and can slide horizontally beneath the rails, allowing the router (with tracks attached to its base) to ride above the stage to cut: a) the saddle slot, b) 45 degree ramp behind the saddle slot, c) channel between the ramp and tie block, and d) optional ledge behind the tie block.
Attachment:
Routing complete.jpg

4) Wings are rounded over by hand with a rasp and scraper.
Attachment:
Clean up by chisels and rounding of wings by file.jpg

5) Bone strips and overlay are glued to the tieblock, and holes are drilled (in this case 12).
Attachment:
Drilling string holes.jpg

6) Completed bridge.


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PostPosted: Thu Mar 27, 2008 9:39 am 
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Old Growth Brazilian Rosewood
Old Growth Brazilian Rosewood
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Joined: Fri Nov 02, 2007 9:49 am
Posts: 10302
Location: Ann Arbor, Michigan
First name: Hesh
Last Name: Breakstone
Country: United States
Status: Professional
A very well done toot Gary! [:Y:] [clap] [clap] [clap] [clap]


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PostPosted: Thu Mar 27, 2008 9:54 am 
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Koa
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Joined: Wed Apr 18, 2007 6:46 am
Posts: 1012
Location: Issaquah, Washington USA
Gary, thanks - good ideas!

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PostPosted: Thu Mar 27, 2008 10:09 am 
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Koa
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Joined: Thu Aug 25, 2005 4:49 pm
Posts: 1198
Location: Ukiah, CA
Beautiful work as usual, Gary.

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Ken Franklin
clumsy yet persistent
http://www.franklinguitars.com


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PostPosted: Thu Mar 27, 2008 10:26 am 
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Contributing Member
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Joined: Mon Mar 19, 2007 7:05 am
Posts: 9174
Location: United States
First name: Waddy
Last Name: Thomson
City: Charlotte
State: NC
Focus: Build
Status: Semi-pro
Nice. Easy to follow.

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Waddy Thomson Guitars

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