How to Make a Slip Joint Pocket KnifeThis tutorial was drafted by Chris Crawford and is reprinted here with his permission. Be sure to check out his website and custom knife gallery at http://www.chriscrawfordknives.com/. [link will open new window]
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On a side note, I revisited Chris and his techniques after purchasing his knife making DVD, "How to Build a Scale Release Automatic". [link will open new window] I highly recommend this DVD to beginning knife makers interested in building your first folder. It gives a great overview of the mechanics behind this kind of knife construction. Thanks Chris!
This tutorial will show you how I make a slip joint pocketknife step by step. I dont have any special equipment such as milling machines or surface grinders, so the knife in this tutorial should be able to be made in any standard knife shop. If you dont have some of the tools that Im using, be creative. Almost every step could be done in a way other than the way I do it. The methods that I use here have come form a combination of other makers, books, discussion forums, and trial and error.
A Note About Safety: The primary purpose of this tutorial is to demonstrate how I go about making a slip joint pocketknife. It is NOT a lesson on shop safety. It is assumed that the reader already knows basic knife shop safety. If not, please do not attempt this project.
Click on any of the images for a larger view.
OK, Lets get started. I will be using the following material: a 1/32 inch brass sheet, a 1/8 inch nickel silver sheet, a 3/32 inch brass rod, a 1/16 inch brass rod, a 3/32 inch nickel silver rod, a cow shinbone, and a 3/32 inch precision ground bar of 01 tool steel. If you dont have access to a surface grinder, it becomes very important to start off with flat steel for making the blade and spring. Also, great care should be taken to keep the spring and blade perfectly flat during the making of the knife. To do this, I will do very little grinding on the sides of the steel. All scale and scratches will be cleaned up with sandpaper. Its slower working with sandpaper and files than grinding, but the slower work allows me to achieve better accuracy and a better fit when the knife is completed. If you are wondering where you are going to get a shin bone, just go down to your local pet store and pick one up in the dog treat section. Make sure that the bone is labeled as a bleached shinbone.
Its a pretty difficult task to explain the geometry involved in making a slip joint pocketknife. The relationship between the spring and the tang of the knife is very important. So rather than getting into all of that, I will use an old knife that Ive taken apart as a pattern for the project.
Take a black magic marker and color in enough of the 01 to allow the outline of the blade and spring to be scribed onto the steel. Using the old blade and spring as a pattern, scribe around each.
Use a metal cutting band saw to roughly cut the blade and spring out of the 01. If you do not have a band saw, a hacksaw will do the trick also. (It just takes longer.) Be sure to use a push block if you are cutting through pieces. It will be nice to finish the project with all ten fingers.
Now that I have the blade and spring roughly cut out, its time to grind them down to their correct shape. I start off using a 36 grit belt on my 2x72. I grind the pieces down to just outside of the scribed lines. Be sure to keep the dunking water nearby because the small pieces heat up pretty quick. You will notice in the second picture that Im using a push block to support the piece while grinding it. I use a push block a lot, so I will not comment on it each time.
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