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Advanced chain sharpening.


Rough Hewn
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I know!  But as the photos show, the guide is marked as 3/8"P which is the chain (3/8" picco) the file size is marked on too, 4mm, and as you can see I checked with the digital caliper that is the file size fitted.
 
I agree it looks wrong though.  Looked ok for ages but got progressively more weird as the cutters got short.  Still cuts though, well in fact.
 
I have a second 2in1 for standard 3/8" chain, with 5.5mm files... Which seems to take more from the rakers and leaves a good cutter shape.... Although I've not done so much filing on those chains, they may get weird as they get short too perhaps.

3/8 should use a 5.2 mm file.
The 5.5 is for .404
Usually,
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"Ten mil, give or take ten thou."

 

I'm forever jumping between systems. I cut a bit of ply, "Twenty nine by five-five-five." the other week. Madness, I agree. My younger mates, especially a Lithuanian one, look at me like I'm a talking dog when I use feet and inches.

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