A quick and easy to build fixture from Classic Joints With Power Tools by Yeung Chan, ISBN 1-57990-279-0.
I started modifying the router mounting board to attach it to the fixture body with threaded rod for height adjustments, but found that Yeungs method of clamping it in the vice works just fine. Raising or lowering one end is easier than trying to raise the whole 'fence'.
This is just a sandwich of ply with dovetailed runners, allowing X and Y slide adjustments. Adjusting the fence provides the Z. The angles are 20 degree. I made pivoting handles to control the feed of the X and Y sliders, but again found that moving them by hand, as Yeung suggest, worked best. Stop blocks can be clamped to the fence to control width of the mortise. I have to get another clamp to hold the stock,, one isn't making it!
The half inch by 3 inch thru mortise in the pic below in 1 1/2" stock was done in about 3 minutes. (feeding at about 1/8" increments)Rounding the tenon sides to match the mortise took longer, tho![!]
Ken
I started modifying the router mounting board to attach it to the fixture body with threaded rod for height adjustments, but found that Yeungs method of clamping it in the vice works just fine. Raising or lowering one end is easier than trying to raise the whole 'fence'.
This is just a sandwich of ply with dovetailed runners, allowing X and Y slide adjustments. Adjusting the fence provides the Z. The angles are 20 degree. I made pivoting handles to control the feed of the X and Y sliders, but again found that moving them by hand, as Yeung suggest, worked best. Stop blocks can be clamped to the fence to control width of the mortise. I have to get another clamp to hold the stock,, one isn't making it!
The half inch by 3 inch thru mortise in the pic below in 1 1/2" stock was done in about 3 minutes. (feeding at about 1/8" increments)Rounding the tenon sides to match the mortise took longer, tho![!]
Ken