Spline jig #1: First attempt

The shims will give you a repeat cut and help save your jig….. Do you have a good metal detector for those skids? A hidden nail and a new set of knives for my planer cured me of used lumber.

-- My mind is like lighting, one brilliant flash, then its gone.....

I use a stop on my jig to keep the box in place. I agree on moving the box to save from cutting up the jig.
On yours you could easily c-clamp a stop. I set it, cut all 4 corners, then reset the stop and cut 4 more corners, until I have done all the splines.

-- She thought I hung the moon--now she just thinks I did it wrong

I make quite a few boxes with splines. I usually shim the box in the jig to move the placement of the splines. I cut up a lot of jigs, but they are so easy to make I just toss em when they get ratty and build a new one. Oh I leave the fence in the same place always.

-- Made in America, with American made tools....Shopsmith

I’ll try to post a pic of my spline jig as it solves most of your concerns but a description will have to do for tonight: the cradle portion of my jig is open at the bottom so it never gets cut. The jig also rides the tablesaw fence so I don’t have to worry about it wandering. I clamp the boxes to the jig and this stops movement from wallowing out the splines. In use I never pull the box back through the blade and this results in very consistent splines. I’ll try to do pics this weekend.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

I built my 2 spline jigs for 1/8 and 1/4 inch thick splines and slotted them in 4 places with the slots being 1/2 inch apart. I use my router table to cut the slots and move the jig and fence until the bit moves freely through the slot then lock the fence down. My next project is to build 2 more jigs in the same way to cut dovetail splines in both 1/4 and 1/2 inch sizes.

-- If it won't fit get a BIGGER hammer.