Lansky axe & machette sharpener.

I would go for a file over that. For two reasons: 1: That looks like it would take a while to thin an edge. 2: It is a carbide scraper so I would worry about the evenness of the carbide edge. Read this thread about carbide sharpeners to get an idea what I am talking about: http://www.bladeforums.com/forums/s...-(with-micrographs)?highlight=Carbide+scraper

Back the file, do you have access to a 12" mill bastard file? I have found that a file of that size does work really, really quickly. Follow up with a coarse stone and stropping for a good to go machete edge.
 
For larger work, a big single cut file is the tool for this job, as long as the RC of the particular tool isn't too high. Most big choppers are lower RC to prevent damage. Clamp the tool to the edge of a bench. Refine it further with a draw-knife sort of pass. Smaller files make a finer edge, a 6" will be good enough for most to stop and use, just shaving some arm hair.

http://www.evenfallstudios.com/woodworks_library/nicholson_guide_to_filing_2006.pdf

The Lansky probably works OK for a field sharpener. A combination puck is also a good choice.
 
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