Post by francis on Aug 6, 2018 10:18:24 GMT
Sometime ago I built a jig to aid in the cutting of dovetail socket and pins for set neck-body joints. I tend now to use bolt-on neck-body constructions using mortice and tenons.
The original jig was based loosely on one half of the LMI/O'Brien jig but it needed a little modification to allow me to cut the body mortice's having in the mean time changed from ¼-inch to ½-inch routers. This simply needed a new sliding top plate with a recess to allow the 30mm guide bush / 19mm cutter combo to give me a 30mm wide x 19mm deep mortice.
The guitar body sits on the blue pad at the bottom of the jig - this is adjustable and the body is pushed up inside the jig against the bottom of the top plate. There are then three adjustable plates that allow the body to be centred laterally and also held firmly against the front rail.
Underside of the jig showing the adjustable pads allowing sideways centring and pressure pad to push the body into the front rail.
The second jig relates to the tenon and shoulders of the neck joint. Specifically to make the compound angle shoulder cuts.
This I wanted to carry out on a table saw and be able to quickly a) adjust the angle(s) for the compound cut then b) flip things to make the reversed compound cut to the other edge of the neck:
Neck on the jig after all cuts completed
Angled fence 'flip-able' using register pins to either side of a fixed central fence
Adjustment screw
The table in the foreground gives the angle/mm spacing data between the two inside faces of the fences. So the adjustment is made according to the table and the wood shims added to lock the fence angle (a proper adjustment lock to be added)
Hope these are of interest
The original jig was based loosely on one half of the LMI/O'Brien jig but it needed a little modification to allow me to cut the body mortice's having in the mean time changed from ¼-inch to ½-inch routers. This simply needed a new sliding top plate with a recess to allow the 30mm guide bush / 19mm cutter combo to give me a 30mm wide x 19mm deep mortice.
The guitar body sits on the blue pad at the bottom of the jig - this is adjustable and the body is pushed up inside the jig against the bottom of the top plate. There are then three adjustable plates that allow the body to be centred laterally and also held firmly against the front rail.
Underside of the jig showing the adjustable pads allowing sideways centring and pressure pad to push the body into the front rail.
The second jig relates to the tenon and shoulders of the neck joint. Specifically to make the compound angle shoulder cuts.
This I wanted to carry out on a table saw and be able to quickly a) adjust the angle(s) for the compound cut then b) flip things to make the reversed compound cut to the other edge of the neck:
Neck on the jig after all cuts completed
Angled fence 'flip-able' using register pins to either side of a fixed central fence
Adjustment screw
The table in the foreground gives the angle/mm spacing data between the two inside faces of the fences. So the adjustment is made according to the table and the wood shims added to lock the fence angle (a proper adjustment lock to be added)
Hope these are of interest
Jo whoever he is.
