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Brian Dougherty

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Everything posted by Brian Dougherty

  1. Do you ever have issues with your bandsaw blades when slicing these bars up? Do you normalize the bars before cutting? I haven't been normalizing, but it seems like I frequently run into something that suddenly dulls the blade.
  2. Buy individual pieces from McMaster to replace the worn out taps on your set. The basic HSS taps they sell are way better than any box store set I have ever seen. Probably be way less than $100 to replace the worn ones, and then just a few bucks whenever you need to replace one after that.
  3. A big enough water jet could cut it, but it will be a relatively slow cut. I would think it would be cheaper to get a machine shop to mill out the hole. There is probably a guy with a mill in his garage within a few miles of you that would help you out just because you show interest in metalworking.
  4. I wouldn't say I have a well informed opinion, but I feel it would make the tip harder to aim, and is likely to catch or at least rub on the meat as you pull through the cut. I think it looks really cool, and that may be enough reason to leave it there. However, from a purely functional point of view, it doesn't seem to add anything. In my day job (engineer) things that don't add to the function have a tendency to get in the way at some point. Then again, maybe I am using too much science and not enough art
  5. Recently I saw a folder I made for a guy earlier in the summer. He carries it every day and is very 'Proud' of the knife, but he also knows how to take care of tools. Even with that I was surprised to see some rust forming around the pivot area. It's made me think about trying some stainless for a folder. (Shudder) I have a commercial knife with an S35VN blade. It is the one production knife I have had in the last 10 years where I wasn't disappointed in the blade performance so I thought I would start looking there. I have a small heat treating oven, so I am not too worried about complex thermal schedules. However, the quench process is new to me. Here is what I copied from a supplier website about hardening: HARDENING Preheat: Heat to 1550-1600°F (845-870°C), Equalize. Austenitize: 1900-2000°F (1035-1095°C), hold time at temperature 15-30 minutes. Quench: Air or positive pressure quench (2 bar minimum) to below 125°F (50°C), or salt or interrupted oil quench to about 1000°F (540°C), then air cool to below 125°F (50°C). Temper: Double temper at 400-750°F (200-400°C). Hold for 2 hours minimum each time. A freezing treatment may be used between the first and second tempers. Freezing treatments help to attain maximum hardenability and must always be followed by at least one temper. NOTE: For optimum stress relieving, CPM S35VN may be tempered at 1000-1025°F (540-550°C). Tempering in this range may result in a slight decrease in corrosion resistance. Size Change: +0.05 to +0.10% when fully martensitic. The presence of retained austenite may reduce the net growth. When tempering at 400-750°F (200-400°C), freezing treatments may be necessary to minimize retained austenite. I take it this is an air hardening steel. Am I right in thinking that the positive pressure is to increase the air density to pull the heat out faster than it would at ambient pressure? I'm not sure how I would pull that off, but I could do the interrupted oil quench fairly easily. This stuff isn't' that expensive. Now that my curiosity is up, I'll probably end up buying a little to play with. (Shudder again)
  6. I like the look of the little peak on the spine at the tip, but suspect that feature would actually be detrimental when using the knife.
  7. Thanks Chris. The steel turned out like I wanted, but I didn't plan ahead for what the grinding of the bevels would do to the pattern. That was the first blade I made from the bar. This is the second one. (I showed it a couple of weeks ago since I finished it first) I adjusted the grind a bit to get a better pattern: @Alex Middleton - Nice stabilizing tank!
  8. Yep, cactus juice will attacks some plastics. I seem to remember that they have a warning about one plastic in particular on their website.
  9. Just putting on the finishing touches on another blade made with a bar of double twists that I forged a while back.
  10. The movie was horrible! Don't wast your time on it, read the books.
  11. What that old joke about having to clean out your forge so you can remount the rear brake drum to the family car to drive to town?
  12. I made a melting furnace lining out of refractory cement mixed with vermiculite once. That would have been easy to cast into brick shapes. I wouldn't recommend this over buying bricks, but if it's adventure you are after... This is a thing? Why didn't someone tell me this before?!?
  13. Sigh... ...the youth of today. Before you do anything else with your life, read this. It'll be available in your local or school library. https://www.amazon.com/Ultimate-Hitchhikers-Guide-Galaxy/dp/0345453743/ref=sr_1_2?crid=1ND43OWFVOOYG&keywords=hitchhikers+guide+to+the+galaxy&qid=1571429204&sprefix=hitchhikers%2Caps%2C157&sr=8-2
  14. 42 (If you don't get the joke, I'll have a book recommendation for you...)
  15. I moved my platen out about an inch to overcome this. I've been very happy with my OBM. It's been 4 or 5 years now. I'm probably going to have to replace the tacking wheel soon, but that is the only issue I've had in all this time.
  16. This one is tempting. It's expensive, but I keep thinking about what I was told years ago when I complained about how expensive my caving helmet was. Something along the lines of, "If your skull isn't worth it, then buy a cheap helmet". https://www.amazon.com/Carbon-Monoxide-Inspector-Detector-Portable/dp/B004YUEPBW/ref=sr_1_16?crid=2FYVV3YZMJHRH&keywords=co+monitor&qid=1571426532&sprefix=co+mon%2Caps%2C147&sr=8-16
  17. Cool. I think I would leave the oxidation colors in place too.
  18. Management theory classes teach that most people who no longer need to worry about ensuring they have basic needs for survival tend to be motivated by having a purpose, or contributing to something that they feel is important. I tend to be a bit more selfish than that. I am most content in my personal life when I am pushing my motley collection of skills to a new level. That may be because my real job has me making somewhat heroic efforts to solve other people's problems in short timelines. When I go home, it is "My" time.
  19. Ugh, Hollywood types... Happiness is more of a decision than a destination. We all have different chemistry, and I do believe that some people simply can't make that choice because of their own personal makeup. However, I also believe that most people's inability to choose happiness is that they are too greedy to be satisfied with what they have. I am as guilty of this as anybody, but have had some serious wake-up calls. When I meet people who are genuinely happy but also have much less to look forward to than I do, I have to remind myself that I have no business complaining about anything.
  20. What CO monitors have you guys had luck with in the smithy/forge environment? I've never put one out in mine, but would like to. I can't see the residential home use ones surviving well in the -20F to 130F dirty environment in my shed. My forge is in a 12'x24" utility shed with a roll-up garage style door. I always have the door open, but I'm also in the back half of the building, so you never really know how good the air is.
  21. You probably know this, but the downward angle can easily be adjusted by grinding/filing back the tip of the spring slightly. (Before assembly of course) I've been adjusting this to where I want the finished angle to be pretty early in the process of the knife, and haven't seen it changing much as I finish the knife. I've seen sources that say you should leave the blade angled down a bit early on to allow for later corrections as they become necessary, but that hasn't matched my experience so far. The tip should theoretically rise a bit as you do the final polishing of the spring tip, and the land area on the back of the blade, but I haven't seen enough movement to keep me from setting the angle when I do the first fit-up.
  22. Nice I like the sculpting on the scales for the coke-bottle one; that isn't something I have thought of.
  23. Just an update since this thread go broughback up on its own: I bought some pull the dot snaps, but was too cheap to buy the special setting tool just to try them out. If I can figure out how to get these things set, I'll report back. I've got some sheath work in my near future that will motivate me to get this sorted out. Lately I've been distracted with some other knifey things.
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