legOFwhat? wrote: ↑Fri May 15, 2020 9:20 am
Chad, you've inspired me to try many different methods and materials not to mention all the tips and tricks you've shared. I for one am grateful.
That green mule is crazy! I've tried to incorporate brass and other usual materials together and it's not easy to sand and shape with the different densities and hardness, especially the finicky resin types. :eek:
Thank you for the kind words.
Right now I consider you "the guy" that is inspiring people to make Mule handles. You have been doing tons of beautiful work! I look forward to seeing your next Mule.
There's a few tips I can offer about combining hard and soft materials. Ctek and most other resin based materials are relatively soft, sand easily, scratch easily and deform under heat pretty easily too. When you combine a soft material with hard materials you have to take precautions to ensure you don't sand away too much soft material while working on the harder one. The bigger the difference between the material hardness or wear resistance the more difficult it gets. For example, a stainless steel pin in resin is much more problematic than a nickel silver pin would be.
Adding small pieces of metal (brass, copper, nickel, Ti, whatever...) presents a couple of challenges. For sanding I suggest 3 things...
First shape the rough size of the individual parts to be as close to the finished size/shape as you can prior to bonding anything with epoxy. Metals conduct heat better than one would prefer when trying to rough-shape a handle on the grinder and the heat can easily ruin the epoxy bond. Copper (specifically) also tends to grind away in a gummy way and will leave little copper "hairs" wedged between material layers if you try to do too much too fast after gluing.
Second, if you add pieces of metal slicing through the handle (like the copper band on the green Mule I posted) you cannot count on epoxy to hold it in place. The bond between the metal and the epoxy will not be as strong as the bond to the other material and a sharp whack can dislodge the metal. For adding metals in that type of orientation I suggest using an internal pin to hold it in place.
Third, avoid hand sanding (with your actual hands and fingers) until you are beyond 800 grit. Use hard sanding blocks (not rubber) to do any hand sanding for grits below 800. I use pieces of aluminum that I have shaped into various sizes and shapes. The sanding block will help you keep from sanding the softer materials below the level of the harder materials. If you "finger sand" or "shoeshine sand" a soft material with metal in it, you end up with a crowned piece of metal in the handle. Anything above 800 grit won't remove much material and will be much safer to use by hand but I would still suggest being careful if dealing with extreme hardness differences like Ti vs Ctek, or brass vs wood, etc..
Any time you have any questions that arise feel free to let me know, I'm happy to share anything I know that might help.
Best regards,
Chad
:spyder: Spyderco fan and collector since 1991. :spyder:
Father of 2, nature explorer, custom knife maker.
@ckc_knifemaker on Instagram.