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- Dec 31, 2005
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Thanks for the reply. Have you seen any KZ's with a flat grind? Seems to be so much more convenient
Edit: Out of curiosity, what would it cost to set up a belt sander for a novice learning to use one? I have zero to no experience of power toolsSomething along the lines of what's used in this vid: [youtube]eREokC4MPM0[/youtube]
They did at least one ... a Nuclear TTKZ which was done with a flat grind and double cut finish. The flat grind was necessary for the double cut finish to work ... a fully convex edge needs a satin finish if it is to be sharpened in a fully convex way ...

This flat ground model works as well as my TTKZ and my KZII ... so you are right ... this type of design does work well.
I did a re-profile job on my TTKZ modelling the shape from a NMFBM CG which is a thinner knife than the LE and which after stripping it and cleaning it up on a belt sander to a fully convex edge ... was at the time my very best chopper.
When you change the convex geometry to an appleseed shape as opposed to a tear drop shape the thinner lower section enables much greater penetration ...

If you look at the way the light catches the changes on the blade you can see the work done in this photo ...

To ensure you are removing metal where you want to it helps to coat the blade in marker lines and see where they erode and where they remain ...

You only want to remove the thickness behind the edge and leave the upper part unaffected so that when the blade sinks into the wood the upper section serves to open up the cut and allows the edge to bite deeper ... to do this on a belt sander I glued a strip of leather hide to the platten so that I could pressthe lower section of the knife into the platten without any "chatter" you can get of metal on metal ... and the smooth back of the belt fradually removes or shapes the leather to a curved shape whilst the grittier frontal belt removed metal from the knife ... the cost of these 1 x 30 belt sanders is relatively cheap ... check out a Harbour Freight ...

Once you have reprofiled the edge the TTKZ can compare in chopping performance and speed to a Forrest Axe ...

It can cut a deeper shallower cut into the tree and you are half way through the tree at the same time as you are swining an axe ...

The KZII took on board the edge profile comments from the release of the TTKZ but also other comments on handle design. The TTKZ handle is the best handle Busse has ever done for a chopping knife ... why they changed it on the KZII is such a shame ... this handle as Tim says can catch your wrist and allows your hand to slide when chopping ... it is just simply too big on the design side for most peoples hands and mine are pretty big ... for this reason I would advise getting the TTKZ handle and altering the grind rather than the KZII grind and altering the grip.
It can be done but you still have a grip design that can slide a bit ... I re-did the grip on mine and stripped it and took the edge down to where I had took the TTKZ to.


You don't have to do much removal on the KZII profile to get it able to sink right to the spine

The geometry on this one is more performance oriented but from the above pic you can see how much wider the handle is compared to the TTKZ grip
My KZII really needs some modified grips doing for it which bring in the locked in aspect of the grip to the dimensions of the TTKZ ... that is the next task in hand but it does chop well as is ...

Ultimately though the best Zilla I have is the Nuclear Zilla ... it is a fair bit lighter and still has the same power ... again I had to rework the edge ... but only because it came from the shop without taking the edge right to a pinnacle ... but this model is a lot more versatile and as you indicated in your question ... a lot more "ready to go" as a flat grind straight from the shop.
It can sink in to the spine no problem ...



and is versatile in that the Nuclear spine enables it to be used in a lot of different ways ... you can anchor the knife like a two headed axe and baton the log instead of the knife ...

But if I were to rank them in performance on just power alone ... the TTKZ does have the heaviest and most effective swing ... well worth doing the reprofile work on one

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