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The Folding Knife (& Switchblade) Forum The materials, techniques and the designing of folding knives.

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  #1  
Old 01-12-2017, 11:20 AM
tmerkl tmerkl is offline
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Sway Back Jack Pattern

Hey guys,
Hoping I can get some thoughts on this template for a sway back jack slip joint. I've made exactly one semi-successful slippy and took my lessons learned and applied them to this pattern. I'm really just looking for any glaring functional errors in my design. Thanks in advance,
Tim
Attached Images
File Type: jpg SwaybackOpen.JPG (23.5 KB, 74 views)
File Type: jpg SwaybackHalf.JPG (29.6 KB, 70 views)
File Type: jpg SwaybackClosed.JPG (23.5 KB, 65 views)
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  #2  
Old 01-12-2017, 12:09 PM
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cnccutter cnccutter is offline
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Welcome Tim

Like the pattern a lot.

The only area that has me concerned is the notch in the tang for the spring to set in. It is my opinion that it really needs to be at 90 degrees. You are showing that it only touchs the spring in two places on points. If theses two small areas wear any over time your blade will not lock up properly and there would be no fix for it. On my folders I do put on a small releif on the bottom end of the spring to help in seating( lint trap).

Erik
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Old 01-12-2017, 12:20 PM
tmerkl tmerkl is offline
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That was the intent of the angle. I had debated on either doing the space in the tang or relieving the back corner of the spring. I've seen tutorials and books that did it both ways. Maybe I'll change it and just knock off the corner of the spring. Seems like that would be easier to accomplish anyway. Thanks!
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Old 01-12-2017, 12:43 PM
tmerkl tmerkl is offline
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So perhaps something like this would be better?

Just realized this won't work because in the closed position, I lose contact with the bottom of the tang. Back to the drawing board.
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File Type: jpg swaybackopen1.JPG (23.5 KB, 41 views)

Last edited by tmerkl; 01-12-2017 at 12:54 PM.
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Old 01-12-2017, 12:57 PM
tmerkl tmerkl is offline
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Perhaps this?
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Old 01-14-2017, 02:03 PM
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Don Robinson Don Robinson is offline
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I always made my locks just as your design in your first post here shows. No problems.
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Old 01-17-2017, 01:12 PM
tmerkl tmerkl is offline
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Thanks Don. I guess this is just another example of how there's more than one way to skin this cat. Time to get cutting!
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Old 02-28-2017, 10:32 AM
tmerkl tmerkl is offline
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Here's two that I was able to complete from the pattern I posted earlier. Thanks for the input!



There's also a short video of the walk and talk of the one on the bottom on my instagram @tim.merkl

Last edited by tmerkl; 02-28-2017 at 10:58 AM. Reason: Broken Pic Link
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Old 02-28-2017, 04:46 PM
pcpc201 pcpc201 is offline
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Good looking knives there, Very good.
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angle, back, blade, books, degrees, design, first post, knife, knives, lock, made, notch, pattern, post, slip joint, small, tang, template, trap


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