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How To Optimizing 3 Cold Steel Kukri Machetes

Discussion in 'Cold Steel Knives' started by kwackster, Mar 16, 2018.

  1. kwackster

    kwackster

    Dec 23, 2005
    Recently i bought several Cold Steel Kukri Machetes.
    I had read quite a bit about this specific model, and when i could get a very good deal i grabbed them.

    For me these Kukri Machetes have a useful size (they fit inside my daypack), with around 2.8 mm blade thickness they are quite rigid for a machete and certainly not flimsy or wobbly, the steel so far seems well hardened, and the handle fits my hand quite well, while the softer PVC plastic material dampens shock quite effectively.
    The factory edges however are only rudimentary, coming with at best a heavily burred or at worst a not even apexed "edge", which is then simply covered in a black bake-on coating.
    The backs of the blades are very rough as well, with pieces of burring that were almost sharper than the main edge, and a chequered handle surface that can create blisters with prolonged use.
    However with a bit of work & a few simple tools all this can easily be solved, and then the true quality of these very useful blades will come out.

    First i used an F.Dick coarse double cut basterd file to completely remove the heavily burred (and most likely burned) apex.
    Then i used the same file to make a rough convex shape up to the now flattened apex, followed by an Oberg smooth file to refine the surface up to a new apex, but without creating a burr.
    Then i used 3 grits of wet & dry with WD40 as a lubricant on a semi-hard rubber backing to smoothen the convex shape even more, bringing the apex to a burr on 180 grit and refining it through 240 grit and 400 grit.
    The burr was then taken off on the Tormek leather wheel with some PA-70 paste.
    You can click 2 X on each pic for a bit more detail.

    One of the kukri's clamped down with it's heavily burred factory apex already filed flat, but with the coarse +/- 45 degrees factory V-bevels bevels still remaining:

    [​IMG][​IMG][​IMG]

    [​IMG][​IMG][​IMG]

    Starting the new convex edge by filing away the shoulders of the factory edge, then slowly working towards the flattened "apex":

    [​IMG][​IMG][​IMG]

    I think this was actually the first one i did, later this became my tester/user to see how thin i could reasonably take the convexing process.
    Almost there btw.

    [​IMG][​IMG]

    Number two now done with the basterd file, and starting with number three:

    [​IMG]

    During sanding on respectively 180, 240, and 400 grit wet & dry SiC and WD40 as a lubricant backed with an old piece of fiber reinforced rubber conveyor belt.
    The new apexes fit almost perfectly in the 30 degrees inclusive slot of the Tormek WM200 Angle Master.

    [​IMG][​IMG]

    Removing the chequered handle surface with a coarse wood rasp to give it a much more "handpalm-friendly" finish.

    [​IMG][​IMG]

    Right after the wood rasp treatment on the right, and one that has already seen several days of use on the left.

    [​IMG][​IMG][​IMG]
     
    Last edited: Feb 7, 2019
    BlackKnight86 and jbmonkey like this.
  2. kwackster

    kwackster

    Dec 23, 2005
    This is Kukri Machete nr 2 with it's new convex edge (apex at +/- 30 degrees inclusive) and resurfaced PVC handle, currently weighing 504 grams.
    Nr. 3 looks the same but it already went to a friend of mine.

    [​IMG]

    Kukri nr 1 with it's new convex edge (apex also remaining at +/- 30 degrees inclusive) and resurfaced handle, but with a convexed area that is a bit thinner & wider compared to nr 2 and 3.
    The slope on this one starts higher up the blade, and it currently weighs 474 grams.

    [​IMG]

    A few more pics taken in the woods.
    So far it has proven to be indestructible, even with all out chopping of many types of green woods in various thickness up to small trees with a diameter of 15-20 centimeter.
    No catastrophic edge failures or even rolling, while binding in thicker woods has diminished due to the thinner convex.

    [​IMG][​IMG]
     
    Last edited: Sep 21, 2018
  3. mwhich50

    mwhich50 Basic Member Basic Member

    Jan 18, 2011
    Thanks for the terrific review. I have been using this machete in the yard to chop tree limbs for years. I can't believe it is not more popular. It is such a steal for $20-$25.
     
    oxman198 and noviomagus like this.
  4. kwackster

    kwackster

    Dec 23, 2005
    We had something of a storm a few weeks ago, and many forest trails are still littered with broken branches and/or blocked by fallen over small trees like these 3 birches.
    The modified Kukri Machete dealt fast & easy with both the de-limbing as well as chopping up the main trunk into moveable sizes.

    [​IMG][​IMG]
     
    Last edited: Sep 21, 2018
  5. Charlie_K

    Charlie_K

    Jul 16, 2012
    Well now this is certainly an interesting thread.

    My optimization involved simply sharpening the edge with a whetstone and diamond rod until it was smooth and sharp, and slipping a large ranger band over the handle. Not very impressive, but effective.
     
    Mike Sastre likes this.
  6. kwackster

    kwackster

    Dec 23, 2005
    About twice a week we like to take a hike in the forests surrounding our home town, and each time we walk between 7 and 10 kilometers. (about 4 to 6 miles)
    During that time i use any of my choppers to keep the walking trails clear from overgrowth, ranging from small green branches up to small trees, most of them green, some dried.
    The last few weeks i've been using the modified Kukri Machete for this job, and i've been trying out different edge finishes to get a better idea of how this influences both the performance as well as the edge retention of the 1055 steel.

    The first edge on this machete was finished on 400 grit wet & dry with WD40 as a lubricant, while burr removal was done on the Tormek leather wheel with some Tormek paste.
    At the start of a trail this edge was armhair shaving sharp on skin level, and when we returned home it was copy paper slicing sharp.
    I could keep the edge at this level of sharpness for 2 other hikes by stropping it after cleaning on a piece of MDF with some 1.0 micron diamond paste.

    Before the fourth hike the edge was resharpened on a Rubber Wheel coated with 230 grit diamond powder using wax as a lubricant/coolant, and deburred on a Paper Wheel with 1.0 micron diamond compound.
    This provides for a noticeable finer edge (yet still a bit toothy), and at the beginning of our hike the edge was treetopping armhair, and when we returned home the edge was scrape shaving armhair.
    After one more hike and using only the piece of MDF with 1.0 micron diamond compound the edge is currently still at that level of sharpness.
    Maybe after the next hike i will resharpen the edge again to a bit finer finish and see how that does.

    I do know it's all a bit over the top for a simple machete, and in the end i might just settle for file sharpening, but i thought i'd share.
     
  7. Nocturnal13

    Nocturnal13

    199
    Apr 18, 2017
    I love mine but struggle with the recurve. Is using a file and finishing with different grit sandpaper by hand okay?
     
  8. lonestar1979

    lonestar1979

    Mar 2, 2014
    I have bolo machete from Cs and came really dull from factory.After 15 MIN ON BELT SANDER I put really nice high convex edge on it and it performs much better now.Its razor sharp and i touch it up on belt sander and silicon carbide norton coarse-fine stone.Excellent machete for money.
     
  9. 19-3ben

    19-3ben Gold Member Gold Member

    Jul 27, 2015
    I bought my CS luck machete about 10years ago and it has held up wonderfully.
    Way back when I bought it, I barely knew anything about knives and even less about proper maintenance of them. I have no idea how I put a good edge on it back then, but somehow I figured it out. Go figure. Beginners luck.

    In the past few years I’ve been maintinaing a great 18dps convex with my Ken Onion Worksharp. I keep a polished edge on it and have had no issues with chipping or anything.

    I’ll have to update with pics at some point but this machete looks like t went through a war, but damn it it isn’t a mean bugger to use on the juniper bushes in the back yard.
     

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