O'Brien neck joint routing jig, choose dovetail or straight mortise and tenon
Robbie O'Brien came up with this clever neck alignment/routing jig. The jig is simple but elegant as it helps you determine your correct neck angle and then gives you an easy way to transfer the angle to your neck. It enables you to rout the mortise and tenon accurately. Only a small amount of fitting is necessary after routing. The jig comes in an unassembled flatpack, but it is relatively easy to assemble with a minimum of tools and glue. The video/article links (below) fully illustrate how to assemble/use the jig and have many helpful hints for making easy work of this often difficult task.
**Router bits/template guides are not included with this tool. One set of templates is included at no additional cost.
Choose templates below.
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This jig is produced from cabinet-grade medium-density fiberboard (MDF). It is sized for Parlor guitars and larger.
Always test this jig on a mock neck block before using it on your neck!
Straight Mortise and Tenon:
The dimensions of the mortise and tenon prior to fitting them are:
• Mortise - .858"
• Tenon - .955" The tenon is slightly oversized so you can remove just a bit of material and get a perfect fit. See the video included here that addresses this.
Dovetail mortise and tenon:
Our 3/8" bit SPRB38 works well for hogging out the material on a dovetail–then follow with the 7-degree dovetail bit SP7DTL. A small amount of fitting will be necessary after routing to get a perfect fit.
PLEASE NOTE: The dovetail mortise and tenon templates are different lengths to accommodate the offset created by the template guide when routing the dovetail mortise.
You need to use a 5/8 inch OD router guide bushing (SPGB58) (not included) when using these templates. If you don't already own this item, see below to purchase one from LMI.
**Router bits/template guides are not included with this tool.
Video: LMI O'Brien Neck Angle Jig Assembly Instructions
Video: LMI Neck Angle Jig In Use
Video: NJRJ - Tenon Doesn't Fit the Mortise
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