Folding Knives

These slip joint knives overcome the mechanical challenges of the style to qualify as works of art.

The slip joint is the most recognized of any folding knife design. Variations on the theme continue to guide the custom knifemaker and the consumer through a journey of creativity and craftsmanship that is indeed endless.

The latest slip joints are true to this standard and don’t disappoint in looks or legs—easy on the eyes while walking and talking at the same time. They complement their makers’ personalities and demonstrate their skill sets in fit and finish, as well as mechanics. They provide pure inspiration for collectors and buyers alike, setting their own standard of excellence.

Standley Caldwell Five-Blade Cattle Knife

 A slip joint maker for 18 years, Stanley Buzek of Caldwell, Texas, brought a beautiful five-blade cattle knife to life recently. Featuring a CPM 154 hollow ground blade with 416 stainless integral bolsters and liner, along with stag handle scales, the knife was a particular challenge.

“The five-blade cattle knife is a very difficult build, getting all the blades timed and working properly with everything flush in all positions,” Stanley explained, “and getting the blades to clear inside the frame in such a small area. The multiple offset grinds and the dagger grind of the awl blade make it especially challenging.”

Tackling the cattleman works right into the increasingly difficult projects Stanley has pitted himself against—even if it was a daunting proposition. “The five-blade was just a natural progression from the single-blade trapper, two-blade, three-bladed Stockman, and so on, to push myself to the next level of knifemaking,” he confided. “Actually, the hardest part was just getting over my fear of screwing it up and getting started on the build. It is an intimidating knife to build, having to pack so much into such a small area that you can paralyze yourself with the fear of getting started.”

Buzek got the pattern for the five-blade from Tim Robertson. He drew inspiration from the work of Tony Bose, whom he credits with bringing the pattern back. He has also seen photos of Reese Bose’s take on the pattern.

“I have received help from many great makers through the years,” Stanley reflected. “Bill Ruple and Rusty Preston were a huge help, and the South Texas Slip Joint School that I went to back in 2011 really increased my knowledge in how slip joints actually work. Right now, a lot of credit goes to Tim Robertson for pushing me and helping me with problems and us bouncing ideas off each other.”

Buzek makes all his slip joints with integral liners and bolsters accompanied by jeweling on the interior. He prefers slanted bolsters while gravitating toward natural handle materials such as jigged bone, mammoth and stag. “I think the single-blade slip joint will be the most popular for a long time for ease of carry and ease of build in the custom world,” he predicted. “Multi-blades, though not as popular, will push makers to step outside their comfort zone and show collectors and the general public alike the technicality and perfection and precision at which some of these pieces are made and will help makers improve their overall methods.”

Ted Friesenhahn Two-Blade Trapper

When Ted Friesenhahn took up the task of making his two-bladed trapper, he chose to make the second blade a “simmy” skinner. “This is the most popular slip joint, especially in Texas,” said the resident of Seguin, who has been a toolmaker since the age of 18. “I’ve worked in several different tool shops and have had the pleasure of teaching mill classes at hammer-ins.”

For his trapper, Ted chose a hollow ground blade of CPM 154 with a 416 stainless steel frame and bolster and a jigged bone handle. He added, “All of my knives have integral liners, and in this knife, the center is left standing. I have had this idea in my head for a while before I finally did it. I wanted something different and to be able to embellish it, so I chose to do vine filework.”

The most difficult aspect of the slip joint for Friesenhahn is common to most custom knifemakers—getting the rise and fall of the blade correct and flushed at closed, half stop, and open positions. “Of course, the walk and talk are key after all that fit and finish,” he said. “My first knife was an Old Timer Stockman that I had when I was growing up in the country. I have always carried a pocketknife, so like most makers and knife enthusiasts in this area, I had heard of Bill Ruple.

“Many years ago now, Johnny Stout and [ABS master smith and BLADE Magazine Cutlery Hall of Fame® member] Harvey Dean put on a hammer-in at Johnny’s shop in New Braunfels, Texas, where I first met Bill Ruple,” Ted continued. “He was teaching the slip joint classes, and he had a jig he came up with to measure the rise and fall of the blade and spring. It came to be called the Ruple jig … I still use this jig on every knife I build.”

Interestingly, Friesenhahn sees variations on patterns as emerging in popularity. “The current direction is in patterns being turned into different patterns,” he said, “in multi-blades like the stockman lockback whittler and sowbelly whittler. There seems to be a craze with the whittler, and of course, I have one of these variations in the works.”

Bill Burke Single-Blade Trapper

Master smith Bill Burke of Boise, Idaho, recently produced a handsome single-blade trapper with a hollow ground 3-inch blade of stainless damascus steel, blacklip mother-of-pearl handle scales, and 416 stainless integral bolster and liner.

“This knife came about as a class demo for slip joint folders that I taught at Jim Poor’s Flatland Forge in Tuscola, Texas,” said Bill. “The pattern for the class was the ever-popular large single-blade trapper. I added my personal preferences of filework and bolster fluting to this knife, as well as incorporating a piece of Jim Poor’s waterfall pattern damascus into the blade. The only guide I had was a pattern drawn on a piece of paper and e-mailed to me by Luke Swenson.”

Burke has found the most challenging aspect of the slip joint to be mechanical, sharing that observation with other makers. “The most difficult part of any slip joint, at least for me, is getting the timing right so that the spring is level with the frame/liners in all three positions, closed, half stop and open, while also keeping the end of the spring even with the end of the tang in the closed position,” he commented.

“I made my first slip joint folder in about 2001,” Burke continued. “It was a large trapper like this knife. I traced a friend’s knife on a piece of paper and used calipers to measure the dimensions of the tang. This knife was made because I had carried a slip joint pocketknife with me since I was about 5 years old. I can remember sharpening a pencil for a first grade teacher with my pocketknife.

“Over the years, I continued to make slip joints, and they did get better,” he observed. “But I always struggled with the spring timing. Fast-forward 16 years, and a friend of mine from Australia, [journeyman smith] Bruce Barnett, and I went to visit the maestro of the South Texas Slip Joint Cartel, Bill Ruple. We were at Bill’s shop for four days making slip joints. While there, Bill taught me the proper use of the Ruple jig, that little contraption he had put together to make timing of a slip joint something of a science instead of a swag. This little bit of knowledge changed my slip joints from being functional to well-working tools that I am proud of. Bill Ruple and Luke Swenson continue to motivate me to make better slip joint knives.”

As a master smith and forger of knives, Burke sometimes takes on that dimension completing the slip joint. “The only challenge is forging the steel, whether damascus, carbon or stainless, which is not commonly forged,” he advised. “Most people who do forge do not actually forge folder blades but instead forge the steel and then stock remove the blade from the forged steel. There are some who will forge damascus folder blades to get a specific pattern of damascus to follow the curve of the blade shape. This can be seen in the knives made by Owen Wood, Tim Foster, [master smith] Mike Quesenberry and a few others.

“I have forged san mai and damascus folder blades to shape when circumstances made it necessary but do not commonly do so,” Burke concluded. “The challenge making a slip joint knife from forged materials in my opinion is no different than doing stock removal with the possible exception of san mai blades and springs where careful attention has to be paid to ensure the hard core of blade and spring line up precisely so the components stay in alignment, keeping the spring from wandering off to one side of the blade. If this happens and is not corrected, eventually the bolsters will be forced apart and the spring will continue to wear on one side of the blade making the knife useless.”

Bubba Crouch Single-Blade Trapper

Bubba Crouch has been making knives in Pleasanton, Texas, since 2001 and lives just down the road from his friend and mentor Bill Ruple. While Ruple is the leader of the South Texas Slip Joint Cartel, Crouch is a founding member and revels in the lively exchange of ideas and the friendly banter that it provides.

Ruple’s influence is pervasive among slip joint makers, and Crouch is no different. “Bill taught me everything I know about knives,” commented Bubba. “I guess the most important thing he has taught me is to make the next knife better than the last one. That is hard to do!”

Recently, Crouch completed and sold the featured single-blade trapper to a resident of Philadelphia. His available knives sold out in two days during the last 10-day Las Vegas show, and the demand for his work is on the rise. This particular trapper features a 3¾-inch hollow-ground blade of CPM 154 stainless steel, an integral 416 stainless steel frame, and handle scales of pearl with an abalone arrowhead inlay.

“I do all 416 integrals,” Bubba noted. “So, I mill my liners instead of spot welding or soldering, and I have had a lot more luck keeping them flat and even. That makes a better knife, I think, and the integral frame prevents issues with warping and that type of thing.”

The biggest challenge in creating this trapper came with working in pearl, a natural material that presents concerns in chipping, shattering, and even burning. When working with the pearl, Bubba uses a thin liner material glued to the surface to stabilize it, and with the final grind, he removes the liner material while shaping the pearl to fit the handle space.

“If you look at the pearl on some knives, you can see a yellow edge from the heat sometimes,” he said. “I fit the pearl in the handle and then remove it, shaping it to the bolster to avoid the heat before putting it back in. When I’m sanding the pearl, I wet sand, and when I drill, I squirt water on it after starting the hole.”

The abalone inlay gives Bubba’s trapper a distinctive flair, and the process of inserting it is relatively simple. “I have a pantograph machine and use templates to cut the abalone and cut the pocket for it in the pearl,” he said. “You’ve got to be careful and don’t want to pop it in and out too many times. I drill a hole through the pocket that is pretty small and comes out the liner to test fit.”

Crouch enjoys building what he likes, and for now, that is the single- and two-blade slip joint. Multi-blades don’t have great appeal. “My clientele is the everyday carry guy,” he concluded. “So, I build those knives. I don’t see the slip joint market getting soft. It’s traditional and will stay stable. It’s what your grandpa and your dad carried, and as long as there are memories like that, there will always be a market for the slip joint.”

Demand doesn’t seem to waver with the slip joint, and today’s makers are eager to oblige the marketplace.

Read More On Slip Joints:

Trend Watch: Why Are Custom Slip Joint Knives So Popular?
GIVING ’EM THE SLIP: Top Production Slip Joints For EDC
Neo-Slippies: Not Your Granddad’s Slip Joint Knives
Cool Customs: Jason Ritchie’s Slick Zulu Spear Repro Slip Joint