Splines.....how to?

One of the best ways is a jig for the table saw, either riding on the fence or in the miter slot. By adjusting the blade high you will be sizes the length of the spline. The piece of wood with the pencil lines is a story stick to set the stop block on the jig. Next place your box to fit snug against the stop block and cut the spline. Here a pic’s of my jig hope this help understanding spline made on the table saw…BC

You can use the same type of jig on a router table if you have one.

-- Larry "Work like a Captain but Play like a Pirate!"

He said he doesn’t have a table saw or a band saw BC.

You can do them on a router table Johnnie with a sled set up similar to that used on the table saw.
I bet you’ll be able to find a ton of examples if you do a search on this site.
Good Luck.

Aren’t the above suggestions for KEYS (perpendicular to the box sides joints)? If that is what the OP is asking about then a jig for the router table, or an inverted version for use with handsaws wold be a good method. If the question thought is about SPLINES that bind together things like miter joints and go parallel to the joint then routing then I would either create a router sled that holds the parts at 45, or use a router plane with an edge guide.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

OPS my bad…

Thanks for the advice so far.
@ BC + Toolz That sled looks like a good option for me as i have a router table.

-- crumbs make bread--

Hand saw for thin ones using a guide made for a couple of pieces of scrap. if not, then a sled on the router table – I have done both often and both work well

Dumb question alert!!! I am trying to get info on using splines as part of building boxes. Is the use of splines more of just a decorative feature or do the serve a structural component? Also, I have seen several videos on building a spline jig so I am ok with that part but have not been able to find anything on creating the keys. Are these something that you can buy at a store like biscuits?

-- Cassady in Denver, CO