Finishing Plunge Cuts on the Grinder (How I do it)

Discussion in 'Ed Caffrey, MS "The Montana Bladesmith"' started by EdCaffreyMS, Dec 30, 2014.

  1. EdCaffreyMS

    EdCaffreyMS Forum Owner - Moderator

    My Wonderful wife Cindy gave me a new GoPro camera for Christmas! My thought was to be able to provide short "how I do it" videos. This morning I was grinding and thought of something that many folks have asked about during phone conversations....that I could never explain in I tried out the new camera! This is the first attempt with it....but I really like the video quality.

    The plan is to provide short videos on various things that I've received questions on. If there is something you'd like to see, feel free to post it on this thread, or email me, and I'll put it on the list! :)

    This one is a test run to see how things will work. Hopefully, as I learn more about the GoPro, and how to use it, the videos will get better and better.

  2. Freds Edge

    Freds Edge Well-Known Member

    Thanks' Ed, that's all ways been one of my buggers and this approach had come to mind now I will go out to the shop and give it a try.
  3. EdCaffreyMS

    EdCaffreyMS Forum Owner - Moderator

    The one thing I forgot to mention in the video is that rolling the belt edge over the edge of the platen only works with flexible belts! That means that J-weight or lighter! Figured I'd better make mention of that before somebody tries it with a Y or X weight belt and blows the belt up on themselves!! (that's a disclaimer!) :) As I wrote that something came to my mind....that I read on a can a shaving said "Do Not Use near open flames"...... you know that wouldn't be there unless some poor fool did it! :)
  4. HHH Knives

    HHH Knives Super Moderator

    Nice video Ed. Great info. Thanks for sharing!
  5. Jim Moenck

    Jim Moenck Well-Known Member

    Ed, thanks for sharing this video. I have always ran the belt just past the edge of the platen, but only about 1/16" or so and never got a satisfactory transition. I'm going to try it as you described. It sure makes sense when I see how you do it.
  6. Freds Edge

    Freds Edge Well-Known Member

    Yes Ed , I assumed you were using flex belts
  7. Garry

    Garry Well-Known Member

    Thanks Ed, great quality from the camera. Very helpful
  8. JPSWorks

    JPSWorks Well-Known Member

    Thank you Ed, this video is very helpful.

  9. Justin Presson

    Justin Presson Well-Known Member

    Awesome Ed! Tell your wife thank you, can't wait to see more. I'm going to think of something for a video too.
  10. D.Douglas

    D.Douglas Well-Known Member

    Thanks Ed. I pretty much had The same problem as Jim above. Thanks for that tip. Looking forward to cleaner plunges.
  11. Jason Wernli

    Jason Wernli Well-Known Member

    Ed, as always, thanks for taking the time to pour your knowledge back into the craft. The video was short, sweet and too the point. The video and audio quality were both great. There are tons of knife making videos on Youtube that have good info, but are hard to get through because the quality is bad.
    Thanks, and i can't wait to see more... I will watch them ALL!
    - J
  12. rhinoknives

    rhinoknives Well-Known Member

    Thanks Ed,
    Behind every great dude is a great Dudette!
    Thank Cindy for us.
  13. BonhamBlades

    BonhamBlades Well-Known Member

    Cindy gave us all a great gift. Thank her for us.
  14. Eddie Mullins

    Eddie Mullins Well-Known Member

    Great video. Thanks for posting it.

    If you are taking requests, in keeping with the same theme how about your method for grinding and establishing the plunge cuts we just cleaned up?
  15. KenH

    KenH Well-Known Member

    Ed, the whole bunch is thankful for your wife - she did GOOD!!! The image quality of the video is only exceeded by the knowledged shared, so THANK YOU also. Glad to hear what you said about hand sanding to blend the grind line to flats at top of blade. I've had a VERY hard time getting a nice straight grind line, and felt I was cheating when I blended. BUT - now that I know the "Great Ed" sometimes blends, I feel better {g}

    Ken H>
  16. slatroni

    slatroni Well-Known Member

    Thank you Ed!
  17. KenH

    KenH Well-Known Member

    Hey Folks, I just tried Ed's info in the video - using a J-flex belt, let about 1/4" roll over side of platen, and it sure does clean up that plunge nicely. I use a file guide with a round file to file a plunge in, then finish up on grinder. Always was some file marks that took a LOTS of sanding to get out. With this at 400 grit J-flex - nice 'n smooth.

    Ken H>
  18. JPSWorks

    JPSWorks Well-Known Member


    I do have a question for you regarding the j flex belts vs stiffer belts. How do you get the lower grit scratches out?

    The problem I'm having in the plunge cut are the deep 40 or 60 grit scratches from the Orange blaze belts that I can't get out. I love using my Trizac gator ceramic belts from A300, A150, A100. A65. A45. A5.(I don't remember the grit equivalent for the Trizac Cm belts, I'll post it up in a bit) My last 300 belt is too worn to use but it never really took out the deep scratches well. I used a bunch of cheap belts in the 120-220 but they never flexed over the edge.

    I know there are a ton of threads on here and elsewhere regarding belts. However, Ed what belts do you use or would recommend I get between the 40 grit blaze and the 150 gators ceramics? Am I starting too low in the grit with a 40?

    Regarding pre or post ht grinding. I grind the small folder blades post ht, thicker blades I've done pre so far.

    Thank you for any help you can give me on this.

    Last edited: Dec 31, 2014
  19. JPSWorks

    JPSWorks Well-Known Member

    Just found the grit chart conversion from a post from the Big Dog.

    MicronsP GritCAMI (typical US)

  20. Brad Lilly

    Brad Lilly Moderator and Awards Boss

    Great video, Ed sure makes it look easy.

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